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IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
Integrated Device Technology, Inc.
IDT54/74FCT621T/AT
FEATURES:
* * * * Std. and A speed grades Low input and output leakage 1A (max.) CMOS power levels True TTL input and output compatibility - VOH = 3.3V (typ.) - VOL = 0.3V (typ.) Power off disable outputs permit "live insertion" Meets or exceeds JEDEC standard 18 specifications Product available in Radiation Tolerant and Radiation Enhanced versions Military product compliant to MIL-STD-883, Class B and DESC listed (dual marked) Available in DIP, SOIC, CERPACK and LCC packages
DESCRIPTION:
The IDT54/74FCT621T/AT is an octal transceiver with non-inverting Open-Drain bus compatible outputs in both send and receive directions. The B bus outputs are capable of sinking 64mA providing very good capacitive drive characteristics. These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation allows for maximum flexibility in timing.
* * * * *
FUNCTIONAL BLOCK DIAGRAM (1)
PIN CONFIGURATIONS
GAB A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11
GBA GAB
P20-1, D20-1, SO20-2 & E20-1
A1
B1
Vcc GBA B1 B2 B3 B4 B5 B6 B7 B8
2538 drw 02
DIP/SOIC/CERPACK TOP VIEW
INDEX
A2 -A8
B2-B8
7 Other Transceivers
2538 drw 01
A3 A4 A5 A6 A7
A2 A1 GAB Vcc GBA
3 4 5 6 7 8 2 1 20 19 18 17 16 15 14 9 10 11 12 13
L20-2
B1 B2 B3 B4 B5
2538 drw 03
LCC TOP VIEW
The IDT logo is a registered trademark of Integreted Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
(c)1995 Integrated Device Technology, Inc.
A8 GND B8 B7 B6
APRIL 1994
DSC-4222/4
6.18 6.18
1
1
IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
FUNCTION TABLE(1)
Description
GBA, GAB
A1 - A8 B1 - B8
Pin Names Enable Inputs
GBA
2538 tbl 01
Enable Inputs GAB L H L H Function B data to A bus A data to B bus OFF B data to A bus A data to B bus
A Inputs or Open-drain Outputs B Inputs or Open-drain Outputs
L H H L
NOTE: 2538 tbl 02 1. H = HIGH Voltage Level. L = LOW Voltage Level. OFF = HIGH if pull-up resistor is connected to Open-Drain output.
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Rating Commercial (2) Terminal Voltage VTERM -0.5 to +7.0 with Respect to GND VTERM(3) Terminal Voltage -0.5 to with Respect to VCC +0.5 GND TA Operating 0 to +70 Temperature TBIAS Temperature -55 to +125 Under Bias TSTG Storage -55 to +125 Temperature PT Power Dissipation 0.5 IOUT DC Output Current -60 to +120 Military -0.5 to +7.0 Unit V
CAPACITANCE (TA = +25C, f = 1.0MHz)
Symbol Parameter(1) CIN Input Capacitance COUT Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. Unit 10 pF 12
pF
-0.5 to VCC +0.5 -55 to +125 -65 to +135 -65 to +150 0.5 -60 to +120
V
C C C
W mA
2538 lnk 04 NOTE: 1. This parameter is measured at characterization but not tested.
2538 lnk 03 NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. No terminal voltage may exceed VCC by +0.5V unless otherwise noted. 2. Input and VCC terminals only. 3. Outputs and I/O terminals only.
6.18
2
IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following conditions Apply Unless Otherwise Specified: Commercial: TA = 0C to +70C, VCC = 5.0V 5%; Military: TA = -55C to +125C, VCC = 5.0V 10%
Symbol VIH VIL IIH IIL II VIK IOH VOL VOL IOFF VH ICC Parameter Input HIGH Level Input LOW Level Input HIGH Current(5) Input LOW Current(5) Input HIGH Current
(5)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VI = 2.7V VCC = Max., VI = 0.5V VCC = Max., VI = VCC (Max.) VCC = Min., IN= -18mA VCC = Max. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL VCC = 0V, VIN or VO 4.5V -- VCC = max., VIN = GND or Vcc VOH = Vcc (Max.) IOL = 48mA MIL.(4) IOL = 64mA COM'L. IOL = 32mA MIL.(4) IOL = 48mA COM'L.
Min. 2.0 -- -- -- -- -- -- -- -- -- -- --
Typ.(2) -- -- -- -- -- -0.7 -- 0.3 0.3 -- 200 0.01
Max. -- 0.8 1 1 1 -1.2 20 0.55 0.5 1 -- 1
Unit V V A A A V A V V A mV mA
Clamp Diode Voltage Output HIGH Current Output LOW Voltage (B Bus) Output LOW Voltage (A Bus) Input/Output Power Off Leakage(5) Input Hysteresis Quiescent Power Supply Current
NOTES: 2538 tbl 05 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25C ambient. 3. These are maximum IOL values per output, for 8 outputs turned on simultaneously. Total maximum IOL (all outputs) is 512mA for commercial and 384mA for military. Derate IOL for number of outputs exceeding 8 turned on simultaneously. 4. The test limit for this parameter is 5A at TA = -55C. 5. This parameter is guaranteed but not tested.
6.18
3
IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) Test Conditions(1) VCC = Max. VIN = 3.4V(3) Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Input Toggling 50% Duty Cycle Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Bit Toggling at fi =10MHz 50% Duty Cycle Vcc = Max. Outputs Open GBA = GAB = GND or VCC Eight Bits Toggling at fi = 2.5MHz 50% Duty Cycle VIN = VCC VIN = GND Min. -- -- Typ.(2) 0.5 0.15 Max. 2.0 0.25 Unit mA mA/MHz
IC
Total Power Supply Current(6,7)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND
--
1.5
3.5
mA
--
1.8
4.5
--
3.0
6.0(5) 14.0(5)
--
5.0
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested. 6. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fCP/2 + fiNi) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current Caused by an Output Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fi = Input Frequency Ni = Number of Inputs at fi All currents are in milliamps and all frequencies are in megahertz. 7. This test is performed with outputs tied to GND through a pull-down resistor.
2538 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT54/74FCT621T Com'l. Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL
NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays.
IDT54/74FCT621AT Com'l.
(2)
Mil.
(2)
Mil.
(2)
Parameter Propagation Delay A to B Propagation Delay B to A Propagation Delay GBA to A Propagation Delay GAB to B
Condition CL = 50pF RL = 500
(1)
Min.
(2)
Max. Min. 13.0 8.5 12.5 8.0 14.0 8.5 14.0 8.0
Max. Min. 13.5 9.5 13.0 9.0 14.5 9.5 14.5 9.0
Max. Min. 12.0 6.8 12.0 6.4 13.0 6.8 13.0 6.4
Max. Unit 12.5 7.6 12.5 7.2 13.5 7.6 13.5 7.2
2538 tbl 07
5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5
5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5
5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5
5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5
ns ns ns ns
6.18
4
IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL
2538 drw 03
SWITCH POSITION
Test
7.0V
Switch
Open Drain Disable Low Enable Low All Other Tests
Closed
VOUT
Open
500
2538 lnk 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
SET-UP, HOLD AND RELEASE TIMES
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
2538 drw 04
PULSE WIDTH
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU
tH
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
2538 drw 05
tSU
tH
PROPAGATION DELAY
3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
2538 drw 06
ENABLE AND DISABLE TIMES
ENABLE DISABLE 3V CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 1.5V 0V 3.5V 1.5V tPHZ 0.3V VOH 0V
2538 drw 07
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
tPLZ
1.5V 0V 3.5V 0.3V VOL
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns
6.18
5
IDT54/74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XX FCT X Family X X X Process
Temperature Range
DeviceType Package
Blank B P D SO L E 621T 621AT Blank 54 74
Commercial MIL-STD-883, Class B Plastic DIP CERDIP Small Outline IC Leadless Chip Carrier CERPACK Octal Bus Transceiver
High Drive -55C to +125C 0C to +70C
2538 drw 08
6.18
6

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