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Micrel, Inc.
D LATCH
SuperLiteTM SY55853U SuperLiteTM
SY55853U
FEATURES
s s s s s s s s s 2.5GHz min fmax 2.3V to 5.7V power supply Single bit latch Stores or flows through 1 bit of data Optimized to work with SuperLiteTM family Fully differential Source terminated CML outputs for fast edge rates Accepts CML, PECL, LVPECL input logic levels Available in a tiny 10-pin MSOP SuperLiteTM
DESCRIPTION
The SY55853U is a latch. Its differential output will flow through the input while it's enable is high. The output will remain static while the enable is low. In addition, an asynchronous, level sensitive reset is provided. SY55853U inputs can be terminated with a single resistor between the true and the complement pins of a given input. The SY55853U is a member of Micrel's SuperLiteTM family of high-speed CML logic. This family features very small packaging and 2.3V to 5.7V operation.
APPLICATIONS
s High-speed logic s OC-48 communication systems
FUNCTIONAL BLOCK DIAGRAM
DATA LATCH ENABLE
D LE R
Q
OUT
RESET
SuperLite is a trademark of Micrel, Inc. M9999-110705 hbwhelp@micrel.com or (408) 955-1690
Rev.: C Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
SuperLiteTM SY55853U
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
D1 /D 2 LE 3 /LE 4 GND 5 MSOP 10 VCC 9 /R 8R 7Q 6 /Q
Part Number SY55853UKC SY55853UKCTR(2) SY55853UKI SY55853UKITR(2) SY55853UKG(3) SY55853UKGTR(2, 3)
Package Type K10-1 K10-1 K10-1 K10-1 K10-1 K10-1
Operating Range Commercial Commercial Industrial Industrial Industrial Industrial
Package Marking 55853U 55853U 55853U 55853U
Lead Finish Sn-Pb Sn-Pb Sn-Pb Sn-Pb
10-Pin MSOP (K10-1)
55853U with NiPdAu Pb-Free bar line indicator Pb-Free 55853U with NiPdAu Pb-Free bar line indicator Pb-Free
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number 1, 2 3, 4 5 6, 7 8, 9 10 Pin Name D, /D LE, /LE GND Q, /Q R, /R VCC Pin Function CML/PECL/LVPECL Input (Differential): This is the single bit of data that gets clocked in and remembered. CML/PECL/LVPECL Latch Enable Input (Differential): The rising edge of this signal is the clock signal that determines when the Boolean value at the data input gets stored. Ground. CML Output (Differential): This is the output of the flip-flop. CML/PECL/LVPECL Reset Input (Differential): This is an asynchronous active high level reset, that forces the flip-flop into a known state, namely zero. Power Supply.
TRUTH TABLE
D X 0 1 X
Note 1.
LE 0 1 1 X
R 0 0 0 1
Q Latched(1) 0 1 0
/Q Latched(1) 1 0 1
Retains data before LE falling transition.
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55853U
FUNCTIONAL DESCRIPTION
Establishing Static Logic Inputs The true pin of an input pair is internally biased to ground through a 75k resistor. The complement pin of an input pair is internally biased halfway between VCC and ground by a voltage divider consisting of two 75k resistors. To keep an input at static logic zero at VCC > 3.0V, leave both inputs unconnected. For V CC 3.0V, connect the complement input to V CC and leave the true input unconnected. To make an input static logic one, connect the true input to V CC , leave the complement input unconnected. These are the only ;safe ways to cause inputs to be at a static value. In particular, no input pin should be directly connected to ground. All NC (no connect) pins should be unconnected.
VCC NC
X /X
NC NC
X /X
Figure 1. Hard Wiring A Logic "1" (1)
Note 1. X is either D, LE, R input. /X is either /D, /LE, /R input.
VCC > 3.0V
NC VCC
X /X
VCC 3.0V
Figure 2. Hard Wiring A Logic "0" (1)
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SuperLiteTM SY55853U
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) .................................. -0.5V to +6.0V CML Output Voltage .......................... VCC -1.0 to VCC +0.5 Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature (TS) ....................... -65C to +150C
Operating Ratings(Note 2)
Supply Voltage (VIN) .............................. -0.5 to VCC +0.5V Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance MSOP (JA) Still-Air ........................................................... 113C/W 500lpfm ............................................................ 96C/W
Note 1.
Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device reliability. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Note 2.
DC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C; unless noted. Symbol VCC ICC
Note 1.
Parameter Power Supply Voltage Power Supply Current
Condition
Min 2.3
Typ
Max 5.7 37
Units V mA
The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 500lfpm is maintained.
CML DC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C; unless noted. Symbol VID VIH VIL VOH VOL VOS Parameter Differential Input Voltage Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Output LOW Voltage Output Voltage Swing Note 2 Note 2 No Load No Load No Load, Note 3 100 Environment, Note 4 50 Environment, Note 5 Condition Min 100 1.6 1.5 -- -- VCC VCC - 0.1 VCC Typ Max Units mV V V V V V
VCC - 0.020 VCC - 0.010
VCC - 0.97 VCC - 0.825 VCC - 0.660 0.660 0.800 0.950 0.400 0.200 80 100 120
RDRIVE
Note 1. Note 2. Note 3. Note 4. Note 5.
Output Source Impedance
The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 500lfpm is maintained. Inputs must be biased to logic LOW or HIGH when VCC is less than 3.0V. Actual voltage levels and differential swing will depend on customer termination scheme. Typically, a 400mV swing is available in the 100 environment and a 200mV swing in the 50 environment. Refer to the "CML Termination" diagram for more details. See Figure 4. See Figure 3a and 3b.
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55853U
AC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C; unless noted. Symbol fMAX tpd Parameter Max. Operating Frequency Propagation Delay D to Q LE to Q R to Q D to LE D to R LE to D 70 40 400 LE High R High -40C to 0C 0C to 85C 160 250 35 175 160 Condition Min 2.5 400 400 500 Typ Max Units GHz ps ps ps ps ps ps ps ps
tS tH tRR tPW t r, t f
Note 1.
Set-Up Time Hold Time Reset Recovery Minimum Pulse Width CML Output Rise/Fall Times (20% to 80%)
Tested using environment of Figure 3b, 50 load CML output.
TIMING DIAGRAMS
CLK
tH
50% DATA
tS
50%
RESET
tRR
Q
50%
tpd
50%
tpd
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55853U
CML TERMINATION
All inputs accept the output from any other member of this family. All outputs are source terminated 100 CML differential drivers as shown in Figures 3 and 4. SY55853U expects the inputs to be terminated, and that good high
vcc vcc
speed design practices be adhered to. SY55853U inputs are designed to accept a termination resistor between the true and complement inputs of a differential pair. 0402 form factor chip resistors will fit with some trace fanout.
vcc
100
100
100
100
50
50 100 50
100 100 50 100
100
50
50
8mA
8mA
SY55853U
SY55853U
Figure 3a. Differentially Terminated (50 Load CML Output)
Figure 3b. Individually Terminated (50 Load CML Output)
VCC
100
100
100 200 100
8mA
SY55853U
Figure 4.
100 Load CML Output
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55853U
10-PIN MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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