IDT54/74FCT245/A/C
IDT54/74FCT640/A/C
IDT54/74FCT645/A/C
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
Integrated Device Technology, Inc.
FEATURES:
• IDT54/74FCT245/640/645 equivalent to FAST speed
and drive
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an
advanced dual metal CMOS technology. The IDT54/
74FCT245/A/C,IDT54/74FCT640/A/CandIDT54/74FCT645/
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.
• 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
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
1
2
20
19
18
17
16
15
T/R
T/R
A0
A1
A2
A3
A4
A5
A6
A7
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
3
OE
P20-1
D20-1
SO20-2
&
4
A
A
A
A
A
A
A
A
0
1
2
3
4
5
6
7
5
6
B
B
B
B
B
B
B
0
1
2
3
4
5
6
7
E20-1 14
13
12
11
8
9
10
GND
DIP/SOIC/CERPACK
TOP VIEW
INDEX
3
2
20 19
18
A2
A3
A4
A5
A6
4
5
6
7
8
B0
B1
B2
B3
B4
1
17
16
15
14
L20-2
10 11 12 13
9
B7
2534 drw 01
LCC
TOP VIEW
2534 drw 02
NOTES:
1. FCT245, 645 are noninverting options.
2. FCT640 is the inverting option.
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
MAY 1992
1992 Integrated Device Technology, Inc.
7.9
DSC-4201/3
1