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general description the max7219/max7221 are compact, serial input/out- put common-cathode display drivers that interface microprocessors (?s) to 7-segment numeric led dis- plays of up to 8 digits, bar-graph displays, or 64 indi- vidual leds. included on-chip are a bcd code-b decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static ram that stores each digit. only one external resistor is required to set the seg- ment current for all leds. the max7221 is compatible with spi, qspi, and microwire, and has slew- rate-limited segment drivers to reduce emi. a convenient 4-wire serial interface connects to all common ?s. individual digits may be addressed and updated without rewriting the entire display. the max7219/max7221 also allow the user to select code- b decoding or no-decode for each digit. the devices include a 150? low-power shutdown mode, analog and digital brightness control, a scan- limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all leds on. for applications requiring 3v operation or segment blinking, refer to the max6951 data sheet. applications features 10mhz serial interface individual led segment control decode/no-decode digit selection 150? low-power shutdown (data retained) digital and analog brightness control display blanked on power-up drive common-cathode led display slew-rate limited segment drivers for lower emi (max7221) spi, qspi, microwire serial interface (max7221) 24-pin dip and so packages max7219/max7221 serially interfaced, 8-digit led display drivers ________________________________________________________________ maxim integrated products 1 ( ) max7221 only 8-digit p display dig 0?ig 7 mosi i/o sck 18 1 12 13 9 4 din p i set 9.53k 8 digits 8 segments +5v 19 seg a?, seg dp clk load (cs) gnd v+ gnd max7219 max7221 typical application circuit pin configuration 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 dout seg d seg dp seg e gnd dig 4 dig 0 din top view seg c v+ iset seg g dig 7 dig 3 dig 2 dig 6 16 15 14 13 9 10 11 12 seg b seg f seg a clk ( ) max7221 only load (cs) dig 1 dig 5 gnd dip/so max7219 max7221 19-4452; rev 4; 7/03 part max7219 cng max7219cwg max7219c/d 0? to +70? 0? to +70? 0? to +70? temp range pin-package 24 narrow plastic dip 24 wide so dice* ordering information ordering information continued at end of data sheet. *dice are specified at t a = +25?. max7219eng max7219ewg max7219erg -40? to +85? -40? to +85? -40? to +85? 24 narrow plastic dip 24 wide so 24 narrow cerdip spi and qspi are trademarks of motorola inc. microwire is a trademark of national semiconductor corp. bar-graph displays industrial controllers panel meters led matrix displays for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
max7219/max7221 serially interfaced, 8-digit led display drivers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v+ = 5v ?0%, r set = 9.53k ? ?%, t a = t min to t max , unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage (with respect to gnd) v+ ............................................................................-0.3v to 6v din, clk, load, cs ...............................................-0.3v to 6v all other pins.............................................-0.3v to (v+ + 0.3v) current dig0?ig7 sink current................................................500ma sega?, dp source current.........................................100ma continuous power dissipation (t a = +85?) narrow plastic dip (derate 13.3mw/? above +70?)..............................................................1066mw wide so (derate 11.8mw/? above +70?).................941mw narrow cerdip (derate 12.5mw/? above +70?) ...1000mw operating temperature ranges (t min to t max ) max7219c_g/max7221c_g ..............................0? to +70? max7219e_g/max7221e_g ............................-40? to +85? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? r set = open circuit all digital inputs at v+ or gnd, t a = +25? digit off, v digit = v+ t a = +25?, v+ = 5v, v out = (v+ - 1v) all segments and decimal point on, i seg_ = -40ma 8 digits scanned v+ = 5v, v out = 0.65v t a = +25?, v+ = 5v, v out = (v+ - 1v) conditions 8 operating supply current ? 150 i+ v 4.0 5.5 v+ operating supply voltage shutdown supply current ? -10 i digit digit drive leakage (max7221 only) % 3.0 ? i seg segment drive current matching ma/? 10 20 50 ? i seg / ? t segment current slew rate (max7221 only) ma 330 i+ hz 500 800 1300 f osc display scan rate ma 320 i digit digit drive sink current ma -30 -40 -45 i seg segment drive source current units min typ max symbol parameter segment off, v seg = 0v ? 1 i seg segment drive leakage (max7221 only) digit off, v digit = (v+ - 0.3v) ma -2 i digit digit drive source current (max7219 only) segment off, v seg = 0.3v ma 5 i seg segment drive sink current (max7219 only)
max7219/max7221 serially interfaced, 8-digit led display drivers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v+ = 5v ?0%, r set =9.53k ? ?%, t a = t min to t max , unless otherwise noted.) v in = 0v or v+ dout, i sink = 1.6ma dout, i source = -1ma conditions ? -1 1 i ih , i il input current din, clk, load, cs v 0.4 v ol output low voltage v 3.5 v ih logic high input voltage v 0.8 v il logic low input voltage v v+ - 1 v oh output high voltage units min typ max symbol parameter din, clk, load, cs v 1 ? v i hysteresis voltage ns 25 t css cs fall to sclk rise setup time (max7221 only) ns 100 t cp clk clock period ns 50 t ch clk pulse width high ns 50 t cl clk pulse width low c load = 50pf ns 25 t ds din setup time ns 50 t csw minimum cs or load pulse high ns 0 t dh din hold time ns 25 t do output data propagation delay ns 50 t ldck load-rising edge to next clock rising edge (max7219 only) ns 0 t csh clk rise to cs or load rise hold time ms 2.25 t dspd data-to-segment delay logic inputs timing characteristics
max7219/max7221 serially interfaced, 8-digit led display drivers 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (v+ = +5v, t a = +25?, unless otherwise noted.) 730 750 740 770 760 790 780 800 820 810 830 4.0 4.4 4.8 5.2 5.6 6.0 scan frequency vs. positive supply voltage max7219/21 01 positive supply voltage (v) scan frequency (hz) 0 20 10 40 30 60 50 70 012345 segment driver output current vs. output voltage max7219/21 02 output voltage (v) output current (ma) r set = 10k ? r set = 20k ? r set = 40k ? max7219 segment output current max7219/21 03 5 s/div 10ma/div 0 maximum intensity = 31/32 max7221 segment output current max7219/21 04 5 s/div 10ma/div 0 maximum intensity = 15/16
max7219/max7221 serially interfaced, 8-digit led display drivers _______________________________________________________________________________________ 5 pin description functional diagram name function 1 din serial-data input. data is loaded into the internal 16-bit shift register on clk? rising edge. 2, 3, 5?, 10, 11 dig 0?ig 7 eight-digit drive lines that sink current from the display common cathode. the max7219 pulls the digit outputs to v+ when turned off. the max7221? digit drivers are high-impedance when turned off. pin 4, 9 gnd ground (both gnd pins must be connected) 12 load (max7219) 18 iset connect to v dd through a resistor (r set ) to set the peak segment current (refer to selecting r set resistor section). 14?7, 20?3 seg a?eg g, dp 13 clk cs (max7221) 24 dout serial-data output. the data into din is valid at dout 16.5 clock cycles later. this pin is used to daisy-chain several max7219/max7221? and is never high-impedance. 19 v+ positive supply voltage. connect to +5v. ( ) max7221 only v+ 8 8 8 8 4 r set load (cs) din dout clk (msb) (lsb) d0 seg a seg g, dp dig 0 dig 7 shutdown register mode register intensity register scan-limit register display-test register intensity pulse- width modulator multiplex scan circuitry address register decoder 8x8 dual-port sram 8 d1 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11 d12 digit drivers d13 d14 d15 code b rom with bypass segment current reference segment drivers load-data input. the last 16 bits of serial data are latched on load? rising edge. chip-select input. serial data is loaded into the shift register while cs is low. the last 16 bits of serial data are latched on cs ? rising edge. serial-clock input. 10mhz maximum rate. on clk? rising edge, data is shifted into the inter- nal shift register. on clk? falling edge, data is clocked out of dout. on the max7221, the clk input is active only while cs is low. seven segment drives and decimal point drive that source current to the display. on the max7219, when a segment driver is turned off it is pulled to gnd. the max7221 segment dri- vers are high-impedance when turned off.
msb max7219/max7221 serially interfaced, 8-digit led display drivers 6 _______________________________________________________________________________________ detailed description max7219/max7221 differences the max7219 and max7221 are identical except for two parameters: the max7221 segment drivers are slew-rate limited to reduce electromagnetic interfer- ence (emi), and its serial interface is fully spi compati- ble. serial-addressing modes for the max7219, serial data at din, sent in 16-bit packets, is shifted into the internal 16-bit shift register with each rising edge of clk regardless of the state of load. for the max7221, cs must be low to clock data in or out. the data is then latched into either the digit or control registers on the rising edge of load/ cs . load/ cs must go high concurrently with or after the 16th rising clock edge, but before the next rising clock edge or data will be lost. data at din is propagated through the shift register and appears at dout 16.5 clock cycles later. data is clocked out on the falling edge of clk. data bits are labeled d0?15 (table 1). d8?11 contain the register address. d0?7 contain the data, and d12?15 are ?on? care?bits. the first received is d15, the most significant bit (msb). digit and control registers table 2 lists the 14 addressable digit and control regis- ters. the digit registers are realized with an on-chip, 8x8 dual-port sram. they are addressed directly so that individual digits can be updated and retain data as long as v+ typically exceeds 2v. the control registers consist of decode mode, display intensity, scan limit (number of scanned digits), shutdown, and display test (all leds on). shutdown mode when the max7219 is in shutdown mode, the scan oscil- lator is halted, all segment current sources are pulled to ground, and all digit drivers are pulled to v+, thereby blanking the display. the max7221 is identical, except the drivers are high-impedance. data in the digit and control registers remains unaltered. shutdown can be used to save power or as an alarm to flash the display by successively entering and leaving shutdown mode. for minimum supply current in shutdown mode, logic inputs should be at ground or v+ (cmos-logic levels). typically, it takes less than 250? for the max7219/ max7221 to leave shutdown mode. the display driver can be programmed while in shutdown mode, and shutdown mode can be overridden by the display-test function. clk din d15 dout d14 d1 d0 t css t cl t ch t cp t do t ldck t csw t csh t ds t dh cs or load figure 1. timing diagram table 1. serial-data format (16 bits) d14 d15 x d12 d13 x x d10 d11 d8 d9 address d6 d7 d4 d5 x d2 d3 d0 d1 msb data lsb
initial power-up on initial power-up, all control registers are reset, the display is blanked, and the max7219/max7221 enter shutdown mode. program the display driver prior to display use. otherwise, it will initially be set to scan one digit, it will not decode data in the data registers, and the intensity register will be set to its minimum value. decode-mode register the decode-mode register sets bcd code b (0-9, e, h, l, p, and -) or no-decode operation for each digit. each bit in the register corresponds to one digit. a logic high selects code b decoding while logic low bypasses the decoder. examples of the decode mode control-regis- ter format are shown in table 4. when the code b decode mode is used, the decoder looks only at the lower nibble of the data in the digit registers (d3?0), disregarding bits d4?6. d7, which sets the decimal point (seg dp), is independent of the decoder and is positive logic (d7 = 1 turns the decimal point on). table 5 lists the code b font. when no-decode is selected, data bits d7?0 corre- spond to the segment lines of the max7219/max7221. table 6 shows the one-to-one pairing of each data bit to the appropriate segment line. max7219/max7221 serially interfaced, 8-digit led display drivers _______________________________________________________________________________________ 7 table 2. register address map table 3. shutdown register format (address (hex) = 0xxc) table 4. decode-mode register examples (address (hex) = 0xx9) no-op x 0 0 0 0 0 address 0 1 0xx0 0xx1 digit 1 x 0 0 0 1 1 0 1 0xx2 0 0xx3 0 digit 2 x digit 3 x 0 1 1 0 digit 0 x 0 0 1 0xx4 0xx5 digit 5 x 0 1 1 1 1 0 1 0xx6 0 0xx7 0 digit 6 x digit 4 x digit 7 x 1 0 0 0 0 0 1 0xx8 0xx9 1 decode mode x intensity x 1 0 0 1 1 0 1 0xxa 0xxb shutdown x 1 1 1 0 1 0 1 0xxc 1 0xxf 1 display test x scan limit x d15 d12 d11 d10 register d9 d8 hex code x shutdown mode 0xxc x x x x x x x x x 0 x 1 x x x register data mode normal operation 0xxc 0 no decode for digits 7? 0 0 1 d7 decode mode 0 0x00 0 0 1 d6 d5 0 1 d4 d3 0 1 code b decode for digits 7? code b decode for digit 0 no decode for digits 7? 0 0 0 1 d2 hex code 0 register data 0 0xff 1 1 d1 d0 0 1 0 1 0 0 0 0x01 0 code b decode for digits 3? no decode for digits 7? 1 1 1 1 0x0f address code (hex) d6 d4 d7 d5 d2 d0 d3 d1
max7219/max7221 intensity control and interdigit blanking the max7219/max7221 allow display brightness to be controlled with an external resistor (r set ) connected between v+ and iset. the peak current sourced from the segment drivers is nominally 100 times the current entering iset. this resistor can either be fixed or vari- able to allow brightness adjustment from the front panel. its minimum value should be 9.53k ? , which typi- cally sets the segment current at 40ma. display bright- ness can also be controlled digitally by using the intensity register. digital control of display brightness is provided by an internal pulse-width modulator, which is controlled by the lower nibble of the intensity register. the modulator scales the average segment current in 16 steps from a maximum of 31/32 down to 1/32 of the peak current set by r set (15/16 to 1/16 on max7221). table 7 lists the intensity register format. the minimum interdigit blank- ing time is set to 1/32 of a cycle. serially interfaced, 8-digit led display drivers 8 _______________________________________________________________________________________ table 5. code b font table 6. no-decode mode data bits and corresponding segment lines 0 0 x 0 0 0 1 1 1 1 1 1 d7* register data 0 7-segment character d3 d6?4 d1 d2 dp* d0 b a d c f e g 1 0 x 0 0 1 1 0 on segments = 1 0 1 0 0 0 2 0 x 1 0 0 1 1 1 0 0 1 1 3 0 x 1 0 1 1 1 1 1 0 0 1 4 0 x 0 1 0 1 0 0 1 1 0 1 5 0 x 0 1 1 0 1 1 1 1 0 1 6 0 x 1 1 0 0 1 1 1 1 1 1 7 0 x 1 1 1 1 1 0 1 0 0 0 8 1 x 0 0 0 1 1 1 1 1 1 1 9 1 x 0 0 1 1 1 1 1 1 0 1 1 x 1 0 0 0 0 0 0 0 0 1 e 1 x 1 0 1 0 1 1 0 1 1 1 h 1 x 0 1 0 1 0 0 1 1 1 1 l 1 x 0 1 1 0 0 1 0 1 1 0 p 1 x 1 1 0 1 1 0 0 1 1 1 blank 1 x 1 1 1 0 0 0 0 0 0 0 *the decimal point is set by bit d7 = 1 f e a g d c b standard 7-segment led dp a corresponding segment line d6 dp c d4 b d5 e d2 d g register data d0 f d1 d3 d7
scan-limit register the scan-limit register sets how many digits are dis- played, from 1 to 8. they are displayed in a multiplexed manner with a typical display scan rate of 800hz with 8 digits displayed. if fewer digits are displayed, the scan rate is 8f osc /n, where n is the number of digits scanned. since the number of scanned digits affects the display brightness, the scan-limit register should not be used to blank portions of the display (such as leading zero suppression). table 8 lists the scan-limit register format. max7219/max7221 serially interfaced, 8-digit led display drivers _______________________________________________________________________________________ 9 table 7. intensity register format (address (hex) = 0xxa) duty cycle max7221 max7219 d6 d7 d4 d2 d3 d0 d5 d1 hex code 1/16 (min on) 1/32 (min on) x x x x 0 0 0 0 0xx0 2/16 3/32 x x x x 0 0 1 0 0xx1 3/16 5/32 x x x x 0 0 0 1 0xx2 4/16 7/32 x x x x 0 0 1 1 0xx3 5/16 9/32 x x x x 1 0 0 0 0xx4 6/16 11/32 x x x x 1 0 1 0 0xx5 7/16 13/32 x x x x 1 0 0 1 0xx6 x 8/16 15/32 x x x x 1 0 1 1 0xx7 9/16 17/32 x x x x 0 1 0 0 0xx8 10/16 19/32 x x x x 0 1 1 0 0xx9 11/16 21/32 x x x x 0 1 0 1 0xxa 12/16 23/32 x x x x 0 1 1 1 0xxb 13/16 25/32 x x x x 1 1 0 0 0xxc 14/16 27/32 x x x x 1 1 1 0 0xxd 15/16 29/32 x x x x 1 1 0 1 0xxe 15/16 (max on) 31/32 x x x 1 1 1 1 0xxf table 8. scan-limit register format (address (hex) = 0xxb) x x display digit 0 only* display digits 0 & 1* x x x d7 scan limit 0xx1 x 0xx0 x x x 0 d6 d5 0 1 d4 d3 x x display digits 0 1 2* display digits 0 1 2 3 x x x x 0 0xx3 x d2 hex code 0xx2 0 register data 0 x x x d1 d0 0 1 1 x 0 1 0 x x display digits 0 1 2 3 4 display digits 0 1 2 3 4 5 x x x 0xx5 x 0xx4 x x x 1 0 1 x x display digits 0 1 2 3 4 5 6 display digits 0 1 2 3 4 5 6 7 x x x x 1 0xx7 x 0xx6 0 0 x x x 1 1 1 x 1 1 0 *see scan-limit register section for application.
max7219/max7221 if the scan-limit register is set for three digits or less, individual digit drivers will dissipate excessive amounts of power. consequently, the value of the r set resistor must be adjusted according to the number of digits dis- played, to limit individual digit driver power dissipation. table 9 lists the number of digits displayed and the corresponding maximum recommended segment cur- rent when the digit drivers are used. display-test register the display-test register operates in two modes: normal and display test. display-test mode turns all leds on by overriding, but not altering, all controls and digit reg- isters (including the shutdown register). in display-test mode, 8 digits are scanned and the duty cycle is 31/32 (15/16 for max7221). table 10 lists the display-test reg- ister format. no-op register the no-op register is used when cascading max7219s or max7221s. connect all devices?load/ cs inputs together and connect dout to din on adjacent devices. dout is a cmos logic-level output that easily drives din of successively cascaded parts. (refer to the serial addressing modes section for detailed infor- mation on serial input/output timing.) for example, if four max7219s are cascaded, then to write to the fourth chip, sent the desired 16-bit word, followed by three no-op codes (hex 0xxx0x, see table 2). when load/ cs goes high, data is latched in all devices. the first three chips receive no-op commands, and the fourth receives the intended data. applications information supply bypassing and wiring to minimize power-supply ripple due to the peak digit driver currents, connect a 10? electrolytic and a 0.1? ceramic capacitor between v+ and gnd as close to the device as possible. the max7219/max7221 should be placed in close proximity to the led display, and connections should be kept as short as possible to minimize the effects of wiring inductance and electro- magnetic interference. also, both gnd pins must be connected to ground. selecting r set resistor and using external drivers the current per segment is approximately 100 times the current in iset. to select r set , see table 11. the max7219/max7221? maximum recommended seg- ment current is 40ma. for segment current levels above these levels, external digit drivers will be need- ed. in this application, the max7219/max7221 serve only as controllers for other high-current drivers or tran- sistors. therefore, to conserve power, use r set = 47k ? when using external current sources as segment dri- vers. the example in figure 2 uses the max7219/max7221? segment drivers, a max394 single-pole double-throw analog switch, and external transistors to drive 2.3 and2307slc common-cathode displays. the 5.6v zener diode has been added in series with the decimal point led because the decimal point led forward volt- age is typically 4.2v. for all other segments the led forward voltage is typically 8v. since external transis- tors are used to sink current (dig 0 and dig 1 are used as logic switches), peak segment currents of 45ma are allowed even though only two digits are displayed. in applications where the max7219/max7221? digit dri- vers are used to sink current and fewer than four digits are displayed, table 9 specifies the maximum allow- able segment current. r set must be selected accord- ingly (table 11). refer to the power dissipation section of the absolute maximum ratings to calculate acceptable limits for ambient temperature, segment current, and the led forward-voltage drop. serially interfaced, 8-digit led display drivers 10 ______________________________________________________________________________________ table 9. maximum segment current for 1-, 2-, or 3-digit displays table 10. display-test register format (address (hex) = 0xxf) 10 20 2 maximum segment current (ma) 1 30 3 number of digits displayed x x normal operation d6 x x display test mode d4 x x d5 x x d2 x 0 register data d0 x x x d1 x d3 1 x d7 mode note: the max7219/max7221 remain in display-test mode (all leds on) until the display-test register is reconfigured for normal operation.
computing power dissipation the upper limit for power dissipation (pd) for the max7219/max7221 is determined from the following equation: pd = (v + x 8ma) + (v+ - v led )(duty x i seg x n) where: v+ = supply voltage duty = duty cycle set by intensity register n = number of segments driven (worst case is 8) v led = led forward voltage i seg = segment current set by r set dissipation example: i seg = 40ma, n = 8, duty = 31/32, v led = 1.8v at 40ma, v+ = 5.25v pd = 5.25v(8ma) + (5.25v - 1.8v)(31/32 x 40ma x 8) = 1.11w thus, for a cerdip package ( ja = +80?/w from table 12), the maximum allowed ambient temperature t a is given by: t j(max) = t a + pd x ja + 150? = t a +1.11w x 80?/w where t a = +61.2?. the t a limits for pdip and so packages in the dissipation example above are +66.7? and +55.6?, respectively. cascading drivers the example in figure 3 drives 16 digits using a 3-wire ? interface. if the number of digits is not a multiple of 8, set both drivers?scan limits registers to the same number so one display will not appear brighter than the other. for example, if 12 digits are need, use 6 digits per display with both scan-limit registers set for 6 digits so that both displays have a 1/6 duty cycle per digit. if 11 digits are needed, set both scan-limit registers for 6 digits and leave one digit driver unconnected. if one display for 6 digits and the other for 5 digits, the sec- ond display will appear brighter because its duty cycle per digit will be 1/5 while the first display? will be 1/6. refer to the no-op register section for additional infor- mation. max7219/max7221 serially interfaced, 8-digit led display drivers ______________________________________________________________________________________ 11 table 11. r set vs. segment current and led forward voltage table 12. package thermal resistance data 12.2 17.8 1.5 40 11.0 2.5 11.8 30 9.69 15.8 v led (v) 10.6 29.8 2.0 66.7 20 17.1 14.0 25.9 15.0 28.0 10 3.5 22.6 59.3 3.0 i seg (ma) 24.5 63.7 51.2 55.4 24 narrow dip 24 wide so package +85?/w 24 cerdip maximum ambient temperature (t a ) = +85? maximum junction temperature (t j ) = +150? +80?/w thermal resistance ( ja ) +75?/w
max7219/max7221 serially interfaced, 8-digit led display drivers 12 ______________________________________________________________________________________ and2307slc anode dp anode a anode f anode b anode g anode c anode e anode d 5 7 9 6 10 4 2 1n5524b 5.6v 5% 3 88 seg d seg e seg c seg g seg b seg f seg a seg dp gnd nc1 nc2 in1 *4.7k ? pullup required for max7221 ( ) max7221 only in2 no1 no2 4 3 8 7 1 10 2 5 9 gnd din load (cs) i sft v+ 16 com1 com2 dig 1 dig 0 data in load (cs) clock clk 4.7k ? 4.7k ? -5v 5v 2 11 18 19 * * irf540 30k ? irf540 23 21 20 17 16 15 14 22 4 9 1 12 13 cathode anode dp anode a anode f anode b anode g anode c anode e anode d 5 7 9 6 10 4 2 3 cathode and2307slc max7219 max7221 max394 0.1 f figure 2. max7219/max7221 driving 2.3in displays
max7219/max7221 serially interfaced, 8-digit led display drivers ______________________________________________________________________________________ 13 ( ) max7221 only clock load data dout seg d seg dp seg e gnd dig 4 dig 0 din 5v 8 8 seg c v+ iset seg g dig 7 9.53k ? dig 3 dig 2 dig 6 seg b seg f seg a clk load (cs) dig 1 dig 5 gnd max7219 max7221 dout seg d seg dp seg e gnd dig 4 dig 0 din 5v 8 8 seg c v+ iset seg g dig 7 9.53k ? dig 3 dig 2 dig 6 seg b seg f seg a clk load (cs) dig 1 dig 5 gnd max7219 max7221 data in 0.1 f 0.1 f figure 3. cascading max7219/max7221s to drive 16 seven-segment led digits
max7219/max7221 serially interfaced, 8-digit led display drivers 14 ______________________________________________________________________________________ ordering information (continued) chip topography part max7221 cng max7221cwg max7221c/d 0? to +70? 0? to +70? 0? to +70? temp range pin-package 24 narrow plastic dip 24 wide so dice* max7221eng max7221ewg max7221erg -40? to +85? -40? to +85? -40? to +85? 24 narrow plastic dip 24 wide so 24 narrow cerdip *dice are specified at t a = +25?. seg f seg a clk load or cs dig 1 dig 5 gnd gnd dig 7 dig 3 dig 2 dig 6 0.093" (2.36mm) 0.080" (2.03mm) seg b iset seg e seg dp seg c seg g dig 4 dig 0 din dout seg d transistor count: 5267 substrate connected to gnd
max7219/max7221 serially interfaced, 8-digit led display drivers ______________________________________________________________________________________ 15 soicw.eps package outline, .300" soic 1 1 21-0042 b rev. document control no. approval proprietary information title: top view front view max 0.012 0.104 0.019 0.299 0.013 inches 0.291 0.009 e c dim 0.014 0.004 b a1 min 0.093 a 0.23 7.40 7.60 0.32 millimeters 0.10 0.35 2.35 min 0.49 0.30 max 2.65 0.050 0.016 l 0.40 1.27 0.512 0.496 d d mindim d inches max 12.60 13.00 millimeters min max 20 ac 0.447 0.463 ab 11.75 11.35 18 0.398 0.413 aa 10.50 10.10 16 n ms013 side view h 0.4190.394 10.00 10.65 e 0.050 1.27 d 0.614 0.598 15.20 24 15.60 ad d 0.713 0.697 17.70 28 18.10 ae h e n d a1 b e a 0-8 c l 1 variations: package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. max7219/max7221 serially interfaced, 8-digit led display drivers max7219/max7221 pdipn.eps package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)

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