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Integrated Device Technology Electronic Components Datasheet

IDT74FCT245A Datasheet

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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®
Integrated Device Technology, Inc.
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
IDT54/74FCT245/A/C
IDT54/74FCT640/A/C
IDT54/74FCT645/A/C
FEATURES:
• IDT54/74FCT245/640/645 equivalent to FASTspeed
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 5µA 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
DESCRIPTION:
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 deter-
mines 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
PIN CONFIGURATIONS
T/R
A0
A1
A2
A3
A4
A5
A6
A7
NOTES:
1. FCT245, 645 are noninverting options.
2. FCT640 is the inverting option.
OE
B0
B1
B2
B3
B4
B5
B6
B7
2534 drw 02
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
©1992 Integrated Device Technology, Inc.
7.9
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1 20
2 19
3 18
4 P20-1 17
5
D20-1
SO20-2 16
6 & 15
7 E20-1 14
8 13
9 12
10 11
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
DIP/SOIC/CERPACK
TOP VIEW
INDEX
3 2 20 19
A2 4
1 18 B0
A3 5
17 B1
A4 6 L20-2 16 B2
A5 7
15 B3
A6 8
14 B4
9 10 11 12 13
LCC
TOP VIEW
2534 drw 01
MAY 1992
DSC-4201/3
1


Integrated Device Technology Electronic Components Datasheet

IDT74FCT245A Datasheet

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

No Preview Available !

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
OE
T/R
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
A0–A7
Side A Inputs or 3-State Outputs
B0–B7
Side B Inputs or 3-State Outputs
2534 tbl 05
FUNCTION TABLE(2)
Inputs
OE T/R
LL
LH
Outputs
Bus B Data to Bus A(1)
Bus A Data to Bus B(1)
H X High Z State
NOTES:
1. 640 is inverting from input to output.
2. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
2534 tbl 06
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
VTERM(2) Terminal Voltage
with Respect
to GND
VTERM(3) Terminal Voltage
with Respect
to GND
Commercial Military Unit
–0.5 to +7.0 –0.5 to +7.0 V
–0.5 to VCC –0.5 to VCC V
TA Operating
Temperature
0 to +70 –55 to +125 °C
TBIAS
Temperature
Under Bias
–55 to +125 –65 to +135 °C
TSTG
Storage
Temperature
–55 to +125 –65 to +150 °C
PT
Power Dissipation
0.5
0.5 W
IOUT
DC Output Current
120
120 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.
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V 6 10 pF
CI/O I/O Capacitance VOUT = 0V 8 12 pF
NOTE:
2534 tbl 02
1. This parameter is measured at characterization but not tested.
7.9 2


Part Number IDT74FCT245A
Description FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
Maker Integrated Device Tech
Total Page 7 Pages
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