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(R)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
DESCRIPTION:
IDT54/74FCT245/A/C IDT54/74FCT640/A/C IDT54/74FCT645/A/C
Integrated Device Technology, Inc.
FEATURES:
* IDT54/74FCT245/640/645 equivalent to FASTTM speed and drive * IDT54/74FCT245A/640A/645A 25% faster than FAST * IDT54/74FCT245C/640C/645C 40% faster than FAST * TTL input and output level compatible * CMOS output level compatible * IOL = 64mA (commercial) and 48mA (military) * Input current levels only 5A max. * CMOS power levels (2.5mW typical static) * Direction control and over-riding 3-state control * Product available in Radiation Tolerant and Radiation Enhanced versions * Military product compliant to MIL-STD-883, Class B and DESC listed * Meets or exceeds JEDEC Standard 18 specifications
The IDT octal bidirectional transceivers are built using an advanced dual metal CMOS technology. The IDT54/ 74FCT245/A/C, IDT54/74FCT640/A/C and IDT54/74FCT645/ A/C are designed for asynchronous two-way communication between data buses. The transmit/receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B ports, and receive (active LOW) from B ports to A ports. The output enable (OE) input, when HIGH, disables both A and B ports by placing them in High-Z condition. The IDT54/74FCT245/A/C and IDT54/74FCT645/A/C transceivers have non-inverting outputs. The IDT54/ 74FCT640/A/C has inverting outputs.
FUNCTIONAL BLOCK DIAGRAM
T/R OE A0 B0 A1 B1 A2 B2 A3 B3
PIN CONFIGURATIONS
T/R A0 A1 A2 A3 A4 A5 A6 A7 GND
1 2 3 4 5 6 7 8 9 10 20 19 18
P20-1 D20-1 SO20-2 & E20-1
17 16 15 14 13 12 11
Vcc OE B0 B1 B2 B3 B4 B5 B6 B7
DIP/SOIC/CERPACK TOP VIEW
INDEX
B4 A5 B5 A6 B6 A7 B7
NOTES: 1. FCT245, 645 are noninverting options. 2. FCT640 is the inverting option.
2534 drw 02
A2 A3 A4 A5 A6
A1 A0 T/R Vcc OE
32 4 5 6 7 8 1 20 19 18 17 16 15 14 9 10 11 12 13
A4
L20-2
B0 B1 B2 B3 B4
The IDT logo is a registered trademark of Integrated Device Technology, Inc. FAST is a registered trademark of National Semiconductor Co.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
(c)1992 Integrated Device Technology, Inc.
A7 GND B7 B6 B5
LCC TOP VIEW
2534 drw 01
MAY 1992
DSC-4201/3
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs
2534 tbl 05
FUNCTION TABLE(2)
Inputs
OE
T/R A0-A7 B0-B7
OE
L L H
T/R R L H X
Outputs Bus B Data to Bus A(1) Bus A Data to Bus B(1) High Z State
2534 tbl 06
NOTES: 1. 640 is inverting from input to output. 2. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Rating VTERM(2) Terminal Voltage with Respect to GND VTERM(3) Terminal Voltage with Respect to GND TA Operating Temperature TBIAS Temperature Under Bias TSTG Storage Temperature PT Power Dissipation DC Output Current IOUT Commercial -0.5 to +7.0 Military Unit -0.5 to +7.0 V
CAPACITANCE (TA = +25C, f = 1.0MHz)
Symbol CIN CI/O Parameter(1) Input Capacitance I/O Capacitance Conditions VIN = 0V VOUT = 0V Typ. Max. Unit 6 8 10 12 pF pF
tbl 02
-0.5 to VCC
-0.5 to VCC
V
NOTE: 2534 1. This parameter is measured at characterization but not tested.
0 to +70 -55 to +125 -55 to +125 0.5 120
-55 to +125 -65 to +135 -65 to +150 0.5 120
C C C W mA
NOTES: 2534 tbl 01 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. Inputs and VCC terminals. 3. Outputs and I/O terminals.
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC - 0.2V Commercial: TA = 0C to +70C, VCC = 5.0V 5%; Military: TA = -55C to +125C, VCC = 5.0V 10%
Symbol VIH VIL IIH IIL IIH IIL VIK IOS VOH Parameter Input HIGH Level Input LOW Level Input HIGH Current (Except I/O pins) Input LOW Current (Except I/O pins) Input HIGH Current (I/O pins only) Input LOW Current (I/O pins only) Clamp Diode Voltage Short Circuit Current Output HIGH Voltage VCC = Min., IN = -18mA VCC = Max. , VO = GND VCC = 3V, VIN = VLC or VHC, IOH = -32A VCC = Min. VIN = VIH or VIL VOL Output LOW Voltage (Port A and Port B) IOH = -300A IOH = -12mA MIL. IOH = -15mA COM'L. VCC = 3V, VIN = VLC or VHC, IOL = 300A VCC = Min. VIN = VIH or VIL IOL = 300A IOL = 48mA MIL. IOL = 64mA COM'L.
(3)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max VI = VCC VI = 2.7V VI = 0.5V VI = GND VI = VCC VI = 2.7V VI = 0.5V VI = GND
Min. 2.0 -- -- -- -- -- -- -- -- -- -- -60 VHC VHC 2.4 2.4 -- -- -- --
Typ.(2) -- -- -- -- -- -- -- -- -- -- -0.7 -120 VCC VCC 4.3 4.3 GND GND 0.3 0.3
Max. -- 0.8 5 5(4) -5(4) -5 15 15(4) -15(4) -15 -1.2 -- -- -- -- -- VLC VLC
(4)
Unit V V A
VCC = Max
A
V mA V
V
0.55 0.55
2534 tbl 03
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 and maximum loading. 3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second. 4. This parameter is guaranteed but not tested.
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
VLC = 0.2V; VHC = VCC - 0.2V
Symbol ICC ICC ICCD Parameter Quiescent Power Supply Current Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) Test Conditions(1) Vcc = Max. VIN VHC; VIN VLC Vcc = Max. VIN = 3.4V(3) Vcc = Max. Outputs Open OE = GND T/R = GND or VCC One Input Toggling 50% Duty Cycle Vcc = Max. Outputs Open fi = 10MHz 50% Duty Cycle T/R = OE = GND One Bit Toggling Vcc = Max. Outputs Open fi = 2.5MHz 50% Duty Cycle T/R = OE = GND Eight Bits Toggling VIN VHC VIN VLC Min. -- -- -- Typ.(2) 0.5 0.5 0.15 Max. 1.5 2.0 0.25 Unit mA mA mA/MHz
IC
Total Power Supply Current(6)
VIN VHC VIN VLC (FCT) VIN = 3.4V VIN = GND VIN VHC VIN VLC (FCT) VIN = 3.4V VIN = GND
--
2.0
4.0
mA
--
2.3
5.0
--
3.5
6.5(5)
--
5.5
14.5(5)
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.
2534 tbl 04
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT245/A/C
54/74FCT245 Com'l. Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B Output EnableTime T/R to A or B(3) Output Disable Time T/R to A or B(3) CL = 50 pF RL = 500 1.5 1.5 1.5 1.5 1.5 7.0 9.5 7.5 9.5 7.5 Mil. 1.5 1.5 1.5 1.5 1.5 7.5 10.0 10.0 10.0 10.0 54/74FCT245A Com'l. 1.5 1.5 1.5 1.5 1.5 4.6 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 Mil. 4.9 6.5 6.0 6.5 6.0 54/74FCT245C Com'l. 1.5 1.5 1.5 1.5 1.5 4.1 5.8 4.8 5.8 4.8 Mil. 1.5 1.5 1.5 1.5 1.5 4.5 6.2 5.2 6.2 5.2 ns ns ns ns ns
2534 tbl 07
Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT640/A/C
54/74FCT640 Com'l. Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B Output Enable Time T/R to A or B(3) Output Disable Time T/R to A or B(3) Condition
(1)
54/74FCT640A Com'l.
(2)
54/74FCT640C Com'l.
Min.
(2)
Mil.
(2)
Mil.
(2)
Mil.
(2)
Min.
(2)
Max. Min.
Max. Min.
Max. Min.
Max.
Max. Min.
Max. Unit
CL = 50 pF RL = 500
2.0 2.0 2.0 2.0 2.0
7.0 13.0 10.0 13.0 10.0
2.0 2.0 2.0 2.0 2.0
8.0 16.0 12.0 16.0 12.0
1.5 1.5 1.5 1.5 1.5
5.0 6.2 5.0 6.2 5.0
1.5 1.5 1.5 1.5 1.5
5.3 6.5 6.0 6.5 6.0
1.5 1.5 1.5 1.5 1.5
4.4 5.8 4.8 5.8 4.8
1.5 1.5 1.5 1.5 1.5
4.7 6.2 5.2 6.2 5.2
ns ns ns ns ns
2534 tbl 08
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT645/A/C
54/74FCT645 Com'l. Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B Output Enable Time T/R to A or B(3) Output Disable Time T/R to A or B(3) CL = 50 pF RL = 500 1.5 1.5 1.5 1.5 1.5 9.5 11.0 12.0 11.0 12.0 Mil. 1.5 1.5 1.5 1.5 1.5 11.0 12.0 13.0 12.0 13.0 54/74FCT645A Com'l. 1.5 1.5 1.5 1.5 1.5 4.6 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 Mil. 4.9 6.5 6.0 6.5 6.0 54/74FCT645C Com'l. 1.5 1.5 1.5 1.5 1.5 4.1 5.8 4.8 5.8 4.8 Mil. 1.5 1.5 1.5 1.5 1.5 4.5 6.2 5.2 6.2 5.2 ns ns ns ns ns
2534 tbl 09
Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 3. This parameter is guaranteed but not tested.
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS
VCC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 V OUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: 2534 tbl 08 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
DATA INPUT t SU TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. t REM 3V 1.5V 0V 3V 1.5V 0V tH 3V 1.5V 0V 3V 1.5V 0V
PULSE WIDTH
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
1.5V
t SU
tH
PROPAGATION DELAY
3V 1.5V tPLH OUTPUT t PLH OPPOSITE PHASE INPUT TRANSITION tPHL 3V 1.5V 0V t PHL 0V VOH 1.5V VOL
ENABLE AND DISABLE TIMES
ENABLE CONTROL INPUT t PZL OUTPUT NORMALLY SWITCH LOW CLOSED t PZH OUTPUT SWITCH NORMALLY OPEN HIGH 3.5V 1.5V 0.3V t PHZ 0.3V 1.5V 0V V OH 0V t PLZ DISABLE 3V 1.5V 0V 3.5V V OL
SAME PHASE INPUT TRANSITION
NOTES 2534 drw 04 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0 MHz; ZO 50; tF 2.5ns; tR 2.5ns.
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IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XX FCT X Device Type X Package X Process
Temperature Range
Blank B P D SO L E 245 640 645 245A 640A 645A 245C 640C 645C 54 74
Commercial MIL-STD-883, Class B Plastic DIP CERDIP Small Outline IC Leadless Chip Carrier CERPACK Non-Inverting Buffer Transceiver Octal Inverting Buffer Transceiver Non-Inverting Buffer Transceiver Fast Non-Inverting Buffer Transceiver Fast Octal Inverting Buffer Transceiver Fast Non-Inverting Buffer Transceiver Super Fast Non-Inverting Buffer Transceiver Super Fast Octal Inverting Buffer Transceiver Super Fast Non-Inverting Buffer Transceiver -55C to +125C 0C to +70C
2534 drw 03
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