IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDINDUSTRIALTEMPERATURERANGES
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
IDT54/74FCT245T/AT/CT
FEATURES:
• Std., A, and C grades
• Low input and output leakage 1µA (max.)
• CMOS power levels
• True TTL input and output compatibility:
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
• High Drive outputs (-15mA IOH, 64mA IOL)
• Meets or exceeds JEDEC standard 18 specifications
• Military product compliant to MIL-STD-883, Class B and DESC
listed (dual marked)
• Power off disable outputs permit "live insertion"
• Available in the following packages:
– Industrial: SOIC, SSOP, QSOP, TSSOP
– Military: CERDIP, LCC
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT245T is 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.
FUNCTIONAL BLOCK DIAGRAM
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
© 2016 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DECEMBER 2016
DSC-5510/7


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
PIN CONFIGURATION
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
CERDIP/ SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
MILITARYANDINDUSTRIALTEMPERATURERANGES
INDEX
32
20 19
A2 4
1 18
B0
A3 5
17 B1
A4 6
16 B2
A5 7
15
A6 8
14
9 10 11 12 13
B3
B4
LCC
TOP VIEW
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
VTERM(2)
VTERM(3)
TSTG
IOUT
Description
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Max
–0.5 to +7
–0.5 to VCC+0.5
–65 to +150
–60 to +120
Unit
V
V
°C
mA
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. Inputs and Vcc terminals only.
3. Output and I/O terminals only.
CAPACITANCE (TA = +25°C, F = 1.0MHz)
Symbol
Parameter(1)
Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V 6 10 pF
COUT
Output Capacitance VOUT = 0V
8
12 pF
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
OE
T/R
A0 - A7
B0 - B7
Description
Output Enable Inputs (Active LOW)
Transmit/Recieve Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
FUNCTION TABLE(1)
Inputs
OE T/R
LL
LH
HX
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
Z = High Impedance
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
2


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDINDUSTRIALTEMPERATURERANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%; Military: TA = –55°C to +125°C, VCC = 5.0V ±10%
Symbol
Parameter
Test Conditions(1)
Min. Typ.(2)
VIH Input HIGH Level
VIL Input LOW Level
IIH Input HIGH Current(4)
IIL Input LOW Current(4)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
VCC = Max.
VCC = Max.
VI = 2.7V
VI = 0.5V
2—
——
——
——
IOZH High Impedance Output Current VCC = Max
VO = 2.7V
IOZL (3-State output pins)(4)
VO = 0.5V
II Input HIGH Current(4)
VCC = Max., VI = VCC (Max.)
VIK Clamp Diode Voltage
VCC = Min, IIN = -18mA
VH Input Hysteresis
ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC
——
——
——
— –0.7
— 200
— 0.01
Max.
0.8
±1
±1
±1
±1
±1
–1.2
1
Unit
V
V
µA
µA
µA
µA
V
mV
mA
OUTPUT DRIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
VOH Output HIGH Voltage
VCC = Min
IOH = –6mA MIL
VIN = VIH or VIL
IOH = –8mA IND
IOH = –12mA MIL
IOH = –15mA IND
VOL OutputLOWVoltage
VCC = Min
IOL = 48mA MIL
IOS Short Circuit Current
VIN = VIH or VIL
VCC = Max., VO = GND(3)
IOL = 64mA IND
Min. Typ.(2)
2.4 3.3
23
— 0.3
–60 –120
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. The test limit for this parameter is ±5µA at TA = –55°C.
Max.
0.55
–225
Unit
V
V
mA
3


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDINDUSTRIALTEMPERATURERANGES
POWER SUPPLY CHARACTERISTICS
Symbol
ΔICC
ICCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current(4)
IC Total Power Supply Current(6)
Test Conditions(1)
VCC = Max.
VIN = 3.4V(3)
VCC = Max.
Outputs Open
OE = T/R = GND
One Input Toggling
50% Duty Cycle
VIN = VCC
VIN = GND
VCC = Max.
Outputs Open
fi = 10MHz
VIN = VCC
VIN = GND
50% Duty Cycle
OE = T/R = GND
One Bit Toggling
VIN = 3.4V
VIN = GND
VCC = Max.
Outputs Open
fi = 2.5MHz
VIN = VCC
VIN = GND
50% Duty Cycle
OE = T/R = GND
Eight Bits Toggling
VIN = 3.4V
VIN = GND
Min. Typ.(2)
— 0.5
— 0.15
— 1.5
— 1.8
—3
—5
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C 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 ΔICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fCP/2+ fiNi)
ICC = Quiescent Current
ΔICC = 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 = Output Frequency
Ni = Number of Outputs at fi
All currents are in milliamps and all frequencies are in megahertz.
Max.
2
0.25
3.5
4.5
6(5)
14(5)
Unit
mA
mA/
MHz
mA
4


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDINDUSTRIALTEMPERATURERANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
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)
CL = 50pF
RL = 500Ω
74FCT245AT
Min.(2)
Max.
1.5 4.6
1.5 6.2
1.5 5
1.5 6.2
1.5 5
74FCT245CT
Min.(2)
Max.
1.5 4.1
1.5 5.8
1.5 4.8
1.5 5.8
1.5 4.8
Unit
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
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)
CL = 50pF
RL = 500Ω
54FCT245T
Min.(2)
Max.
1.5 7.5
1.5 10
1.5 10
1.5 10
1.5 10
54FCT245AT
Min.(2)
Max.
1.5 4.9
1.5 6.5
1.5 6
1.5 6.5
1.5 6
54FCT245CT
Min.(2)
Max.
1.5 4.5
1.5 6.2
1.5 5.2
1.5 6.2
1.5 5.2
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.
Unit
ns
ns
ns
ns
ns
5


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
TEST CIRCUITS AND WAVEFORMS
MILITARYANDINDUSTRIALTEMPERATURERANGES
V CC
7.0V
VIN
Pulse
Generator
D.U.T
.
RT
VOUT
500W
50pF
500W
CL
Octal Link
Test Circuits for All Outputs
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Switch
Closed
Open
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
tSU
tSU
tH
tREM
tH
Set-Up, Hold, and Release Times
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
Octal Link
LOW-HIGH-LOW
PULSE
HIGH-LOW-HIGH
PULSE
tW
Pulse Width
1.5V
1.5V
Octal Link
SAME PHASE
INPUT TRANSITION
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
tPLH
tPLH
tPHL
tPHL
Propagation Delay
3V
1.5V
0V
VOH
1.5V
VOL
3V
1.5V
0V
Octal Link
CONTROL
INPUT
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
ENABLE
DISABLE
3V
1.5V
tPZL
SWITCH
CLOSED
tPZH
SWITCH
OPEN
0V
tPLZ
3.5V
3.5V
1.5V
tPHZ
0.3V VOL
1.5V
0.3V VOH
0V 0V
Octal Link
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
6


IDT54FCT245AT (Integrated Device Technology)
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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IDT54/74FCT245T/AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
ORDERING INFORMATION
XX FCT XXXX
XX
X XX
Temp. Range
Device Type Package Process
MILITARYANDINDUSTRIALTEMPERATURERANGES
Blank Tube
8 Tape and Reel
G Green
Blank
B
SO
PY
Q
PG
Industrial
MIL-STD-883, Class B
Industrial Options
Small Outline IC (PSG20)
Shrink Small Outline Package (PYG20)
Quarter-size Small Outline Package (PCG20)
Thin Shrink Small Outline Package (PGG20)
Military Options
D CERDIP (CD20)
L Leadless Chip Carrier (LC20)
245T Fast CMOS Octal Bidirectional Transceiver
245AT
245CT
54 55°C to +125°C
74 40°C to +85°C
Datasheet Document History
09/29/2009
12/12/2016
Pg. 7
Pg. 7
Updated the ordering information by removing the "IDT" notation and non RoHS part.
Updated the ordering information by adding detailed package information and Tape & Reel.
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
7
for Tech Support:
logichelp@idt.com




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