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HI-1575
February 2006
MIL-STD-1553 3.3V Dual Transceivers with Integrated Encoder / Decoders
PIN CONFIGURATIONS
40 39 ERROR 38 CHA/CHB 37 CLK 36 D0 35 D1 34 D2 33 D3 32 D4 31 -1 RCVA 2 BUSA 3 BUSA 4 VDD 5 BUSB 6 BUSB 7 RCVB 8 REG 9 - 10
DESCRIPTION
The HI-1575 is a low power CMOS dual transceiver with on-chip Manchester II Encoder and dual Decoder designed to meet the requirements of the MIL-STD-1553 specification. The part acts as a "Smart Transceiver", allowing users to transmit and receive properly encoded MIL-STD-1553 Command and Data words between a 16-bit host processor and dual MIL-STD-1553 data buses. A single write cycle is used to transfer a word to the HI-1575, which encodes the data, adds the selected Sync and Parity bits, and transmits the word on the chosen MIL-STD-1553 data bus. Complete MIL-STD-1553 messages may be transmitted by executing multiple write cycles to the device. Activity on both MIL-STD-1553 data buses is continuously monitored. When the HI-1575 detects a properly encoded word, a hardware interrupt is generated and the information is decoded and stored in one of two internal registers, which may then be read by the host processor. Bits in the internal Status & Mode Register indicate on which bus the word was received and whether the word had a Data or Command Sync.
1575PCI 1575PCT
30 29 D5 28 D6 27 D7 26 GND 25 D8 24 D9 23 D10 22 D11 21 -
40 Pin Plastic 6mm x 6mm Chip-scale package
31 - CHA/CHB
32 - ERROR
30 - CLK
29 - D0
28 - D1
27 - D2
26 - D3
R/W STRB MR SYNC D15 D14 D13 D12 -
11 12 13 14 15 16 17 18 19 20
FEATURES
SYNC - 12
STRB - 10
D15 - 13
D14 - 14
D13 - 15
TQFP package
! Less than 0.5W maximum power dissipation ! 6 mm x 6 mm 40-pin plastic chip-scale
package option
32 Pin TQFP package
! Military processing options
HOLT INTEGRATED CIRCUITS www.holtic.com
(DS1575 Rev.B)
R/W - 9
D12 - 16
MR - 11
! Compliant to MIL-STD-1553A & B ! 3.3V single supply operation ! On-chip Encoder and Dual Decoder ! Small footprint available in 32-pin plastic
RCVA - 1 BUSA - 2 BUSA - 3 VDD - 4 BUSB - 5 BUSB - 6 RCVB - 7 REG - 8
25 - D4
24 - D5 23 - D6
HI-1575PQI & HI-1575PQT
22 - D7 21 - GND 20 - D8 19 - D9 18 - D10 17 - D11
02/06
HI-1575
PIN DESCRIPTIONS
PIN (TQFP)
1 2 3 4 5, 6 7 8 9 10 11 12 13-20, 22-29 21 30 31 32
PULL-UP SYMBOL FUNCTION PULL-DOWN
RCVA BUSA BUSA VDD BUSB BUSB RCVB REG R/W STRB MR SYNC D15:D0 GND CLK CHA/CHB ERROR Digital output Analog I/O Analog I/O Power supply Analog I/O Analog I/O Digital output Digital input Digital input Digital input Digital input Digital I/O Digital I/O Power supply Digital input Digital Input Digital output 12K pull-down 12K pull-up 12K pull-up 12K pull-down 12K pull-down 12K pull-down 12K pull-down -
DESCRIPTION
Goes high when MIL-STD-1553 word received on Bus A MIL-STD-1533 bus driver A, negative signal MIL-STD-1553 bus driver A, positive signal +3.3 VDCr MIL-STD-1533 bus driver B, negative signal MIL-STD-1553 bus driver B, positive signal Goes high when MIL-STD-1553 word received on Bus B Selects Status & Mode Register when high, or Data registers when low Controls data and sync direction during read or write operations Strobe. Timing input to control register read and write operations Pulse high to reset the HI-1575 Selects transmit sync type on write, indicates received sync type on read. Data bus. D15 (MSB) corresponds to MIL-STD-1553 bit 4 Ground 12 MHz clock Selects MIL-STD-1553 Bus A or Bus B Goes high when a received MIL-STD-1553 word has an encoding error
FUNCTIONAL DESCRIPTION
Figure 1 shows a simplified block diagram of the HI-1575. The MR (Master Reset) input should be pulsed high to initialize the Manchester II Encoder and Decoders. MR also clears the Receive Data registers, RXA and RXB, and sets the Status & Mode register to its default state as described in figure 2. The CLK input requires a 12.0 MHz clock signal. CLK is used to derive the 1.0 us bit period for MIL-STD-1553 data transmission, as well to provide the master clock for the Manchester II encoder and the decoder's receiver sampling logic. STATUS & MODE REGISTER The HI-1575 is configured by writing bits 0 - 5 of the Status & Mode (SAM) register. Refer to figure 2 for a complete description. SAM bits 0 - 5 are read/write allowing the user to verify the chip's configuration at any time by reading the SAM. SAM is accessed by performing a read or write cycle with the REG input high. SAM bits 6 - 15 are read-only and are used to provide status information. To allow the user to minimize the number of hardware control inputs, SAM bit 5 (Channel A/B select) is logically 'OR'ed with the CHA/CHB input pin. To select between MIL-STD-1553 bus A or B, the user may either tie the CHA/CHB pin low and select buses using SAM bit 5 (software control), or program SAM bit 5 to a zero and use the CHA/CHB pin to select the active bus (hardware control). Similarly, the SYNC I/O pin may be left open-circuit allowing the transmitter sync to be programmed into SAM bit 4, or SAM bit 4 can be set to zero and the SYNC pin used to set the transmitted SYNC type. Note that SYNC is an I/O pin. It is an input when writing data to the HI-1575 transmit data register (TX), and an output when reading data from the HI-1575 receivers (RXA and RXB). The SYNC pin must not be shorted directly to VDD or GND. An internal pull-down resistor allow the SYNC pin to be left open-circuit if the user opts for purely software control. TRANSMITTER Data words to be transmitted on the MIL-STD-1553 data bus are written to the TX register by pulsing STRB low while R/W is low and REG is low. The logical OR of the CHA/CHB input pin and SAM bit 5 (CHAN) during the write cycle determines whether the word is output on MIL-STD-1553 bus A or B. Setting CHA/CHB OR CHAN to a zero selects bus A, and a one selects bus B. The logical OR of the SYNC pin and SAM bit 4 (TXSYNC) during the write cycle defines whether the transmitted word is a MIL-STD-1553 Command or Data word. Setting SYNC to a one causes a Command (or Status) sync to be generated. Setting SYNC to zero selects a Data sync. Note that the SYNC pin is bidirectional. It should be treated as an extension to the 16-bit bidirectional databus (D15:D0) in terms of I/O switching and timing. The HI-1575 automatically calculates and appends the correct parity bit to the transmitted word. Each word is assigned odd parity as required by MIL-STD-1553.
HOLT INTEGRATED CIRCUITS 2
HI-1575
4 30 CLK STRB R/W MR 10 9 11 Encoder 2 BUSA 3 BUSA VDD
SHIFT
TX
CHA/CHB
31
5 6
BUSB BUSB
DATABUS SYNC RCVA 12 1
SHIFT
RXA
13-20, 22-29
Decoder A
SHIFT
RXB
Decoder B RCVB 7 6 10 32
ERROR
STATUS & MODE
21
GND
FIGURE 1. HI-1575 BLOCK DIAGRAM
To transmit contiguous words, a second write to the TX register must occur no earlier than 3.5 us and no later than 18.5 us after the first TX write. SAM bit 15 (SENDDATA) is high during this period and may be used as a flag to indicate when the HI-1575 is ready to accept the next data write for contiguous transmission. When transmitting a message of three or more words, the third and subsequent write operations should occur every 20.0 us so as to avoid over-writing the previous data before it is transferred to the transmitter's shift register. Figure 3 shows a timing diagram for transmit operations. The transmitter outputs are either direct or transformer coupled to the MIL-STD-1553 data bus. Both coupling methods produce a nominal voltage on the main MIL-STD-1553 bus of 7.5 volts peak-to-peak, line-to-line. Figure 6 shows bus coupling examples. One or both transmitters may be disabled by writing a '1' into SAM register bits 0 or 1 (TXDISA, TXDISB). When disabled, the host interface works as normal, but there is no output from the BUSA and BUSA (BUSB and BUSB) pins.
RECEIVER The HI-1575's two receivers continuously monitor both MIL-STD-1553 data busses. Bi-phase differential data words are accepted from the MIL-STD-1553 bus through the same direct or transformer coupled interface as the transmitter. Each receiver's differential input stage drives a filter and threshold comparator that presents data to the decoders. The decoder logic checks the incoming word for correct encoding, bit count and parity. If a valid MIL-STD-1553 word is received, the RCVA or RCVB output goes high and the 16-bit received word is transferred to the RXA or RXB register. The HI-1575 ERROR output goes high whenever an encoding error is detected on either bus. If a received word has an encoding error, then SAM bits 10 or 14 (ERRORA, ERRORB) are set high, and the corresponding RCVA or RCVB pin is not asserted. To minimize the number of pins necessary to interface the HI-1575, the state of RCVA and RCVB can also be read from SAM bits 7 and 11.
HOLT INTEGRATED CIRCUITS 3
HI-1575
STATUS & MODE REGISTER (SAM)
15 14 13 12 11 10 9 MSB 8 7
Bit Name 0 1 2 3 4 TXDISA TXDISB RENA RENB TXSYNC
R/W R/W R/W R/W R/W R/W
Default Description 0 0 1 1 0 Writing TXDISA to a '1' disables the transmitter for MIL-STD-1553 bus A Writing TXDISB to a '1' disables the transmitter for MIL-STD-1553 bus B Setting RENA to a '1' enables the receiver for MIL-STD-1553 bus A. A '0' disables the receiver causing the HI-1575 to ignore all activity on bus A. Setting RENB to a '1' enables the receiver for MIL-STD-1553 bus B. A '0' disables the receiver causing the HI-1575 to ignore all activity on bus B. The TXSYNC bit is logically ORed with the SYNC input pin during host write cycles to the Transmit Data Register (TX). If TXSYNC OR SYNC is a '1' the transmitter prefixes the transmitted word with a MIL-STD-1553 Command Sync. If TXSYNC OR SYNC is a '0' during a write to TX, then the transmitted word has a MIL-STD-1553 Data Sync. The CHAN bit is logically ORed with the CHA/CHB input pin and the result used to Select between MIL-STD-1553 bus A or B during write transfers to the TX register, or reading data from the RX registers. When CHAN OR CHA/CHB is a '0' during a transmit operation, data is transmitted on MIL-STD-1553 bus A. When the result is a '1', MIL-STD-1553 bus B is selected. During HI-1575 data read cycles, if CHAN OR CHA/CHB is a '0', the RXA register is accessed, and if CHAN OR CHA/CHB is a '1' then the data is read from RXB. Not used. Internally set to '0'. This bit reflects the state of the RCVA output pin. RCVA goes high whenever a new word is received on MIL-STD-1553 bus A. The received word may be read by the host from the RXA register. RCVA is reset on reading RXA or if the HI-1575 detects a new word arriving on bus A. If the data words are contiguous, then RCVA will be high for about 3 us before the new word resets it. The data is still available in the RXA register and may be retreived any time up until the RCVA flag goes high again. If the user does not read the data, the word is lost when the RCVA flag goes high on reception of the next word. RSYNCA indicates the Sync of the last MIL-STD-1553 word received on bus A. RSYNCA is a '0' for a Data sync, and a '1' for a Command Sync. When the RXA register is read, the RSYNCA value is also output on the SYNC I/O pin. GAPA is a '1' when there is no activity detected on MIL-STD-1553 bus A, for example during an inter-message gap. GAPA is a '0' whenever the HI-1575 detects bus traffic. ERRORA goes high when the HI-1575 Manchester decoder receives an incorrectly encoded word on MIL-STD-1553 bus A Same function as RCVA but for MIL-STD-1553 bus B. Same function as RSYNCA but for MIL-STD-1553 bus B. Same function as GAPA but for MIL-STD-1553 bus B. Same function as ERRORA but for MIL-STD-1553 bus B. SENDDATA goes high approximately 3.5 us after the start of a MIL-STD-1553 word transmission. SENDATA goes low approximately 18.5 us after the start of a MIL-STD-1553 word transmission. If new a new data word is written to the TX register while SENDDATA is high, that word will be transmitted contiguously after the currently transmitting word.
5
CHAN
R/W
0
6 7
RCVA
Read-only Read-only
0 0
8
RSYNCA
Read-only
0
9
GAPA
Read-only Read-only Read-only Read-only Read-only Read-only
0 0 0 0 0 0 1
10 ERRORA 11 RCVB
12 RSYNCB 13 GAPB 14 ERRORB
15 SENDDATA Read-only
FIGURE 2. STATUS AND MODE REGISTER
HOLT INTEGRATED CIRCUITS 4
SE N ER DD R AT G OR A AP B RB SY R NC CB V ER B R G OR AP A RA SY R NC CA V NA ot u C se Hd AN TX S R YN EN C RB EN TX A D TX ISB D IS A
0 6 5 4 3 2 1 0 LSB
HI-1575
Write TX, (MIL-STD-1553 Status word)
Write TX, (MIL-STD-1553 Data word) Read SAM, check SENDDATA=1
D15 - D0
TXDATA
DON'T CARE
SAM
TXDATA
R/W
DON'T CARE
CHA/CHB
VALID
DON'T CARE
VALID
SYNC
DON'T CARE
REG
DON'T CARE
STRB
BUSA (B)
SYNC
SYNC
15
14
13
3
3
2
1
0
P
SYNC
SYNC
15
FIGURE 3. EXAMPLE TRANSMIT OPERATION
Read RXA or RXB, (MIL-STD-1553 Data word) Read SAM
BUSA (B)
SYNC
SYNC
15
14
13
12
2
1
0
P
SYNC
SYNC
15
14
13
12
RCVA (B)
R/W
DON'T CARE
CHA/CHB
DON'T CARE
VALID
REG
DON'T CARE
STRB
D15 - D0
SAM
RXA (B)
SYNC
SYNC
FIGURE 4. EXAMPLE RECEIVE OPERATION
CHAN OR CHA/CHB 0 1 X
REG 0 0 1
Register Receiver A Data (RXA) Receiver B Data (RXB) Status & Mode Register (SAM)
FIGURE 5. HI-1575 REGISTER MAP
HOLT INTEGRATED CIRCUITS 5
HI-1575
The host reads the received word from the HI-1575 RXA or RXB register. The data word is read by pulsing STRB low, while R/W is high and REG is low. Figure 4 shows an example receive operation. The SYNC output indicates whether the word had a Command Sync (SYNC=1) or Data Sync (SYNC=0). SAM register bits 8 and 12 (RSYNCA and RSYNCB) retain the Sync values for the last word received on each bus. SAM bits 2 or 3 (RENA, RENB) can be used to independently enable or disable each receiver. Writing a '1' to RENA enables receiver A. A '0' disables the receiver. RENB performs the same function for the MIL-STD-1553 bus B. Note that because each receiver is internally connected to its transmitter, when a MIL-STD-1553 word is transmitted by the HI-1575 it will also be received on the same channel. This feature allows the terminal to self-monitor data transmitted to the MIL-STD-1553 data bus.
3.3 V
MIL-STD-1553 BUS CONNECTION The HI-1575 includes on-chip MIL-STD-1553 analog transceivers which are designed to drive the primary winding of a 1:2.5 turns-ratio MIL-STD-1553 isolation transformer. Figure 6 shows how the HI-1575 may be connected to the MIL-STD-1553 data bus as either a direct coupled stub (Bus A example), or a transformer coupled stub (Bus B example). Holt Integrated Circuits offers a wide range of single-core and dual-core coupling transformers suitable for use with the HI-1575.
VDD 12.0 MHz CLK 55 Ohms
STRB R/W CHA/CHB Host CPU REG D15:D0 SYNC
BUSA
BUSA 1:2.5
55 Ohms
MIL-STD-1553 BUS A (Direct Coupled)
HI-1575 RCVA RCVB ERROR MR BUSB 1:2.5 GND 1:1.4 52.5 Ohms BUSB 52.5 Ohms
MIL-STD-1553 BUS B (Transformer Coupled)
FIGURE 6. MIL-STD-1553 BUS CONNECTION Bit Period Command Word
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
SYNC SYNC
TERMINAL ADDRESS
R/T
SUBADDRESS / MODE
DATA WORD COUNT
P
Data Word
SYNC SYNC
DATA WORD
P
Status Word
SYNC SYNC
TERMINAL ADDRESS
ME
CODE FOR FAILURE MODES
TF
P
FIGURE 7. MIL-STD-1553 WORD FORMATS
HOLT INTEGRATED CIRCUITS 6
HI-1575
TIMING DIAGRAMS
BIT PERIOD BIT PERIOD BIT PERIOD
BUSA - BUSA (BUSB - BUSB)
t R1 t R1 COMMAND SYNC t R1 t R1 DATA SYNC t R3 t R2 ONE ZERO t R3 ONE t R2 t R2
BUSA - BUSA (BUSB - BUSB)
BUSA - BUSA (BUSB - BUSB)
FIGURE 8. MIL-STD-1553 BUS RECEIVER TIMING
MID-SYNC
MID-SYNC MID-PARITY
MID-PARITY
MID-SYNC
MID-PARITY
1553 BUS
COMMAND
DATA
WORD WITH ERROR
tFH
RCVA(B)
tFH tFR tFR
tFH
ERROR
tFR tRF
STRB (Read RXA) (Read RXA) (Read SAM)
tRF
tRF
FIGURE 9. HI-1575 RECEIVER TIMING
REG
VALID
REG
VALID
tRWS tSTR
STRB
tRWH
tRRS tSTR
STRB
tRRH
tDWS tDWH
D15:0 SYNC
VALID
tDRV
D15:0 SYNC
VALID
tDRT
tCHWS tCHWH
CHA/CHB CHA/CHB
tCHRS
tCHRH
tRWWS tRWWH
R/W R/W
tRWRS tRWRH
Figure 10. DATABUS TIMING - WRITE.
Figure 11. DATABUS TIMING - READ
HOLT INTEGRATED CIRCUITS 7
HI-1575 ABSOLUTE MAXIMUM RATINGS
Supply voltage (VDD) Logic input voltage range Receiver differential voltage Driver peak output current Power dissipation at 25C Solder Temperature Junction Temperature Storage Temperature -0.3 V to +5 V -0.3 V DC to +3.6 V +/- 10 Vp-p +1.0 A 1.0 W 275C for 10 sec. 175C -65C to +150C
RECOMMENDED OPERATING CONDITIONS
Supply Voltage VDD....................................... 3.3V... 5% Temperature Range Industrial Screening.........-40C to +85C Hi-Temp Screening........-55C to +125C NOTE: Stresses above absolute maximum ratings or outside recommended operating conditions may cause permanent damage to the device. These are stress ratings only. Operation at the limits is not recommended.
DC ELECTRICAL CHARACTERISTICS
VDD = 3.3 V, GND = 0V, TA = Operating Temperature Range (unless otherwise specified).
PARAMETER
Operating Voltage Total Supply Current
SYMBOL
VDD ICC1 ICC2 ICC3
CONDITION
Not Transmitting Transmit one channel @ 50% duty cycle Transmit one channel @ 100% duty cycle Not Transmitting Transmit one channel @ 100% duty cycle Digital inputs Digital inputs Digital inputs (without pull-down) Digital inputs (without pull-up) Digital inputs and data bus IOUT = -1.0mA, Digital outputs IOUT = 1.0mA, Digital outputs
MIN
3.15
TYP
3.30 4 225 425
MAX
3.45 10 250 500 0.06
UNITS
V mA mA mA W W VDD
Power Dissipation
PD1 PD2
0.3 70%
0.5
Min. Input Voltage Max. Input Voltage Min. Input Current Max. Input Current
(HI) (LO) (HI) (LO)
VIH VIL IIH IIL IPUD VOH VIH
30% 20 -20 275 90% 10%
VDD A A uA VDD VDD
Pull-up / Pull-down current Min. Output Voltage Max. Output Voltage RECEIVER Input resistance Input capacitance Common mode rejection ratio Input Level Input common mode voltage Threshold Voltage - Direct-coupled Detect No Detect Theshold Voltage - Transformer-coupled Detect (HI) (LO)
(Measured at Point "AD" in Figure 12 unless otherwise specified) RIN CIN CMRR VIN VICM VTHD VTHND VTHD VTHND 1 Mhz Sine Wave (Measured at Point "AD" in Figure 12) 1 MHz Sine Wave (Measured at Point "AT" in Figure 13) Differential -5.0 1.15 0.28 0.86 0.20 Differential Differential 40 9 5.0 20 5 Kohm pF dB Vp-p V-pk Vp-p Vp-p Vp-p Vp-p
No Detect
TRANSMITTER(Measured at Point "AD" in Figure 12 unless otherwise specified) Output Voltage Direct coupled Transformer coupled Output Noise Output Dynamic Offset Voltage Direct coupled VOUT VOUT VON VDYN VDYN ROUT 35 ohm load (Measured at Point "AD" in Figure 12) 70 ohm load (Measured at Point "AT" in Figure 13) Differential, inhibited 35 ohm load (Measured at Point "AD" in Figure 12) 70 ohm load (Measured at Point "AT" in Figure 13) Differential, not transmitting -90 -250 10 6.0 18.0 9.0 27.0 10.0 90 250 Vp-p Vp-p mVp-p mV mV Kohm
Transformer coupled Output resistance
HOLT INTEGRATED CIRCUITS 8
HI-1575
AC ELECTRICAL CHARACTERISTICS
VDD = 3.3 V, GND = 0V, TA =Operating Temperature Range (unless otherwise specified)
PARAMETER
TRANSMITTER RiseTtime Fall Time RECEIVER (See figures 8 and 9) Sync Transition Span Short Data Transition Span Long Data Transition Span Delay Mid-Parity to Flag Set Flag Setup Time to Read Flag Reset Delay DATA BUS TIMING - WRITE Strobe STRB Pulse Width REG Write Setup Time REG Write Hold Time Databus / SYNC Write Setup Time Databus / SYNC Write Hold Time CHA/CHB Write Setup Time CHA/CHB Write Hold Time R/W Write Setup Time R/W Write Hold Time
SYMBOL
tr tf tR1 tR2 tR3 tFH tFR tRF (See figure 10) tSTR tRWS tRWH tDWS tDWH tCHWS tCHWH tRWWS tRWWH tSTR tRRS tRRH tDRV tDRT tCHRS tCHRH tRWRS tRWRH
TEST CONDITIONS
35 ohm load 35 ohm load
MIN
100 100
TYP
MAX
300 300
UNITS
ns ns ns ns ns
(Measured at Point "AD" in Figure 12)
1500 500 1000 2500 0 60 50 50 10 50 10 50 10 50 10 50 50 10 60 0 50 10 50 10 60
ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
DATA BUS TIMING - READ (See figure 11) Strobe STRB Pulse Width REG Read Setup Time REG Read Hold Time Data Read to Databus Valid Data Read to Databus Tri-state CHA/CHB Read Setup Time CHA/CHB Read Hold Time R/W Read Setup Time R/W Read Hold Time
HI-1575 TRANSMITTER BUSA/B
1:2.5
55 W 35 W Point "AD"
BUSA/B
Isolation Transformer
55 W
55 W Point "AD" 35 W 55 W
2.5:1
HI-1575 RECEIVER
Isolation Transformer
FIGURE 12. DIRECT COUPLED TEST CIRCUITS
HOLT INTEGRATED CIRCUITS 9
HI-1575
Point "AT"
HI -1575 TRANSMITTER BUSA/B
1:2.5
1:1.4
52.5 W (.75 Zo) 35 W (.5 Zo)
BUSA/B
Isolation Transformer Point "AT" 2.5:1
Coupling Transformer
52.5 W (.75 Zo)
52.5 W (.75 Zo) 35 W (.5 Zo) 52.5 W (.75 Zo)
1.4:1
HI-1575 RECEIVER
Coupling Transformer
Isolation Transformer
FIGURE 13. TRANSFORMER COUPLED TEST CIRCUITS
HEAT SINKING THE LEADLESS PLASTIC CHIP CARRIER PACKAGE
The HI-1575PCI/T is packaged in a 40 pin leadless plastic chip carrier (LPCC). This package has a metal heat sink pad on its bottom surface, which should be soldered to the printed circuit board for optimum thermal dissipation. The package heat sink is electrically isolated and may be soldered to any convenient power plane or ground plane. Redundant "vias" between the exposed board surface and buried power or ground plane will enhance thermal conductivity.
APPLICATIONS NOTE
Holt Applications Note AN-500 provides circuit design notes regarding the use of Holt MIL-STD-1553 data communications devices. Layout considerations, as well as recommended interface and protection components are included.
HOLT INTEGRATED CIRCUITS 10
HI-1575
THERMAL CHARACTERISTICS
Data taken at VDD = 3.3V, continuous data transmission at 1 Mbit/s, single transmitter enabled. PART NUMBER
HI-1575PQI / T HI-1575PCI / T
PACKAGE STYLE
32 pin PQFP 40 pin LPCC
CONDITION
Mounted on circuit board Heat sink pad soldered
qJA
59.5 C / W 27.5 C / W
JUNCTION TEMPERATURE
TA= 25C TA= 85C TA= 125C TBDC TBDC TBDC TBDC TBDC TBDC
ORDERING INFORMATION HI - 1575 xx x x
PART NUMBER LEAD FINISH
Blank F
PART NUMBER
Tin / Lead (Sn / Pb) Solder 100% Matte Tin (Pb-free, RoHS compliant)
TEMPERATURE RANGE FLOW BURN IN
I T M
PART NUMBER
-40C TO +85C -55C TO +125C -55C TO +125C
PACKAGE DESCRIPTION
I T M
NO NO YES
PQ PC
32 PIN PLASTIC PQFP 40 PIN CHIP SCALE PACKAGE (PCM not available)
HOLT INTEGRATED CIRCUITS 11
PACKAGE DIMENSIONS
inches (millimeters)
32 PIN PLASTIC THIN QUAD FLAT PACK (PQFP)
Package Type: 32PTQS
.00057 .00022 (0.0145 .0055) .0315 BSC (0.80 BSC) .0148 .0030 (0.375 .075) .0236 .0059 (0.60 .15)
.3543 BSC SQ. (9.00 BSC)
.2755 BSC SQ. (7.00 BSC)
.0551 .002 (1.4 .05)
See Detail A
.063 MAX. (1.60 MAX.) .0039 .002 (0.10 .05) .0031 R MIN. (0.08 R MIN.)
.0055R .0024 (0.14R .06)
0Q 7
Detail A
40-PIN PLASTIC CHIP-SCALE PACKAGE
Heat sink stud on bottom of package.
millimeters
6.00 .10
4.65 .15
0.50 6.00 .10 4.65 .15
0.25 typ
0.40 .05
See Detail A
0.90 .10 0.2 typ 0.90 .10 0.02 typ
Detail A
HOLT INTEGRATED CIRCUITS 12

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