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FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
Integrated Device Technology, Inc.
IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT IDT54/74FCT640T/AT/CT IDT54/74FCT645T/AT/CT/DT
FEATURES:
* Common features: - Low input and output leakage 1A (max.) - CMOS power levels - True TTL input and output compatibility - VOH = 3.3V (typ.) - VOL = 0.3V (typ.) - 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, SSOP, QSOP, CERPACK and LCC packages * Features for FCT245T/FCT640T/FCT645T: - Std., A, C and D speed grades - High drive outputs (-15mA IOH, 64mA IOL) * Features for FCT2245T: - Std., A and C speed grades - Resistor outputs (-15mA IOH, 12mA IOL Com.) (-12mA IOH, 12mA IOL Mil.) - Reduced system switching noise
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual metal CMOS technology. The FCT245T/ FCT2245T, FCT640T and FCT645T 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 FCT245T/FCT2245T and FCT645T transceivers have non-inverting outputs. The FCT640T has inverting outputs. The FCT2245T has balanced drive outputs with current limiting resistors. This offers low ground bounce, minimal undershoot and controlled output fall times- reducing the need for external series terminating resistors. The FCT2xxxT parts are plug-in replacements for FCTxxxT parts.
FUNCTIONAL BLOCK DIAGRAM
T/R OE A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7
FCT245T/2245T, FCT645T are non-inverting options. FCT640T is the inverting options.
2539 drw 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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
P20-1 D20-1 SO20-2 SO20-7* SO20-8** & E20-1
18 17 16 15 14 13 12 11
Vcc OE B0 B1 B2 B3 B4 B5 B6 B7
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DIP/SOIC/SSOP/QSOP/CERPACK TOP VIEW *FCT245T/2245T, FCT645T only. **FCT245T/2245T, FCT640T
INDEX
A2 A3 A4 A5 A6
A1 A0 T/R Vcc OE
3 4 5 6 7 8 2 1 20 19 18 17 16 15 14 9 10 11 12 13
L20-2
B0 B1 B2 B3 B4
A7 GND B7 B6 B5
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LCC TOP VIEW
MILITARY AND COMMERCIAL TEMPERATURE RANGES
(c)1995 Integrated Device Technology, Inc.
AUGUST 1995
DSC-4611/4
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
FUNCTION TABLE(2)
Inputs
OE
T/R A0-A7 B0-B7
Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs
2539 tbl 01
OE
L L H
T/R R L H X
Outputs Bus B Data to Bus A(1) Bus B Data to Bus B(1) High Z State
2539 tbl 02
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 Commercial VTERM(2) Terminal Voltage -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
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-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
NOTE: 1. This parameter is measured at characterization but not tested.
2539 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.
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS 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 II H II L IOZH IOZL II VIK VH ICC Parameter Input HIGH Level Input LOW Level Input HIGH Current(4) Input LOW Current (4) High Impedance Output Current (3-State Output pins) (4) Input HIGH Current(4) Clamp Diode Voltage Input Hysteresis Quiescent Power Supply Current VCC = Min., IIN = -18mA
--
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VI = 2.7V VI = 0.5V VO = 2.7V VO = 0.5V VCC = Max., VI = VCC (Max.)
Min. 2.0 -- -- -- -- -- -- -- -- --
Typ.(2) -- -- -- -- -- -- -- -0.7 200 0.01
Max. -- 0.8 1 1 1 1 1 -1.2 -- 1
Unit V V A A A V mV mA
2539 lnk 05
VCC = Max., VIN = GND or VCC
OUTPUT DRIVE CHARACTERISTICS FOR FCT245T/640T/645T
Symbol VOH Parameter Output HIGH Voltage Test Conditions(1) VCC = Min. IOH = -6mA MIL. VIN = VIH or VIL IOH = -8mA COM'L. IOH = -12mA MIL. IOH = -15mA COM'L. VCC = Min. IOL = 48mA MIL. VIN = VIH or VIL IOL = 64mA COM'L. VCC = Max., VO = GND (3) Min. 2.4 2.0 -- -60 Typ.(2) 3.3 3.0 0.3 -120 Max. -- -- 0.55 -225 Unit V V V mA
2539 lnk 06
VOL IOS
Output LOW Voltage Short Circuit Current
OUTPUT DRIVE CHARACTERISTICS FOR FCT2245T
Symbol IODL IODH VOH VOL Parameter Output LOW Current Output HIGH Current Output HIGH Voltage Output LOW Voltage Test Conditions(1) VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V (3) VCC = 5V, VIN = VIH or V IL, VOUT = 1.5V (3) VCC = Min. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL IOH = -12mA MIL. IOH = -15mA COM'L. IOL = 12mA Min. 16 -16 2.4 -- Typ.(2) 48 -48 3.3 0.3 Max. -- -- -- 0.50 Unit mA mA V V
2539 lnk 07
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. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second. 4. The test limit for this parameter is 5A at TA = -55C.
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS 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 OE = T/R = GND One Input Toggling 50% Duty Cycle VCC = Max. Outputs Open fi = 10MHz 50% Duty Cycle Min. -- -- -- Typ.(2) 0.5 0.15 0.06 Max. 2.0 0.25 0.12 Unit mA mA/ MHz
VIN = VCC FCTxxxT VIN = GND FCT2xxxT
IC
Total Power Supply Current (6)
VIN = VCC
FCTxxxT
-- -- --
1.5 0.6 1.8 0.9
3.5 2.2 4.5 3.2 6.0 (5) 3.4 (5) 14.0 (5) 11.4 (5)
mA
VIN = GND FCT2xxxT VIN = 3.4 FCTxxxT
OE = T/R = GND
One Bit Toggling VCC = Max. Outputs Open fi = 2.5MHz 50% Duty Cycle
VIN = GND FCT2xxxT VIN = VCC FCTxxxT -- -- -- --
3.0 1.2 5.0 3.2
VIN = GND FCT2xxxT VIN = 3.4 FCTxxxT
OE = T/R = GND
Eight Bits Toggling
VIN = GND FCT2xxxT
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 Input 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.
2539 tbl 08
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT245T FCT2245T 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) Conditions(1) CL = 50 pF RL = 500 Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 7.0 9.5 7.5 9.5 7.5 Mil. Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 7.5 10.0 10.0 10.0 10.0 Min.(2) 1.5 1.5 1.5 1.5 1.5 FCT245AT FCT2245AT Com'l. Max. 4.6 6.2 5.0 6.2 5.0 Mil. Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 4.9 6.5 6.0 6.5 6.0 Unit ns ns ns ns ns
2534 tbl 09
FCT245CT FCT2245CT 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) Conditions(1) CL = 50 pF RL = 500 Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 4.1 5.8 4.8 5.8 4.8 Mil. Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 4.5 6.2 5.2 6.2 5.2 Min.(2) 1.5 1.5 1.5 1.5 1.5
FCT245DT Com'l. Max. 3.8 5.0 4.3 5.0 4.3 Mil. Min.(2) -- -- -- -- -- Max. -- -- -- -- -- Unit ns ns ns ns ns
2534 tbl 10
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT640T 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) Mil. FCT640AT Com'l. Mil. FCT640CT Com'l. Mil.
Conditions(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit 2.0 7.0 2.0 8.0 1.5 5.0 1.5 5.3 1.5 4.4 1.5 4.7 ns CL = 50 pF RL = 500 2.0 13.0 2.0 16.0 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns 2.0 2.0 2.0 10.0 13.0 10.0 2.0 2.0 2.0 12.0 16.0 12.0 1.5 1.5 1.5 5.0 6.2 5.0 1.5 1.5 1.5 6.0 6.5 6.0 1.5 1.5 1.5 4.8 5.8 4.8 1.5 1.5 1.5 5.2 6.2 5.2 ns ns ns
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.
2534 tbl 11
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT645T 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) Conditions(1) CL = 50 pF RL = 500 Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 9.5 11.0 12.0 11.0 12.0 1.5 1.5 1.5 1.5 1.5 Mil. Min.(2) Max. 11.0 12.0 13.0 12.0 13.0 FCT645AT Com'l. Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 4.6 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 Mil. Min.(2) Max. 4.9 6.5 6.0 6.5 6.0 Unit ns ns ns ns ns
2534 tbl 12
FCT645CT 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) Conditions(1) CL = 50 pF RL = 500 Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 4.1 5.8 4.8 5.8 4.8 1.5 1.5 1.5 1.5 1.5 Mil. Min.(2) Max. 4.5 6.2 5.2 6.2 5.2
FCT645DT Com'l. Min.(2) 1.5 1.5 1.5 1.5 1.5 Max. 3.8 5.0 4.3 5.0 4.3 -- -- -- -- -- Mil. Min.(2) Max. -- -- -- -- -- Unit ns ns ns ns ns
2534 tbl 13
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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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS 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 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Open
DEFINITIONS: 2534 lnk 14 CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Switch
Closed
2534 drw 04
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU
tH
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
2534 drw 05
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
2534 drw 06
tSU
tH
PROPAGATION DELAY
3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
2534 drw 07
ENABLE AND DISABLE TIMES
ENABLE DISABLE 3V 1.5V 0V 3.5V 0.3V tPHZ 0.3V 1.5V 0V VOH 0V
2534 drw 08
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPLZ
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
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IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XX FCT X Family X Device Type X Package X Process
Temperature Range
Blank B P D SO L E PY Q
Commercial MIL-STD-883, Class B Plastic DIP CERDIP Small Outline IC Leadless Chip Carrier CERPACK Shrink Small Outline Package Quarter-size Small Outline Package
245T Non-Inverting Octal Bidirectional Transceiver 640T Inverting Octal Bidirectional Transceiver 645T Non-Inverting Octal Bidirectional Transceiver 245AT 640AT 645AT 245CT 640CT 645CT 245DT 645DT Blank 2 54 74 High Drive Balanced Drive -55C to +125C 0C to +70C
2539 drw 09
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