IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT
IDT54/74FCT640T/AT/CT
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
IDT54/74FCT645T/AT/CT/DT
Integrated Device Technology, Inc.
FEATURES:
• Common features:
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an
advanced dual metal CMOS technology. The FCT245T/
FCT2245T, FCT640T and FCT645T are designed for asyn-
chronous 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.
TheFCT245T/FCT2245TandFCT645Ttransceivershave
non-inverting outputs. The FCT640T has inverting outputs.
The FCT2245T has balanced drive outputs with current
limiting resistors. This offers low ground bounce, minimal
undershootandcontrolledoutputfalltimes-reducingtheneed
for external series terminating resistors. The FCT2xxxT parts
are plug-in replacements for FCTxxxT parts.
– Low input and output leakage ≤1µA (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
PIN CONFIGURATIONS
FUNCTIONAL BLOCK DIAGRAM
1
2
20
19
18
T/R
A0
A1
A2
A3
A4
A5
A6
A7
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
T/R
3
P20-1
OE
D20-1 17
4
A
A
A
A
A
A
A
A
0
1
2
3
4
5
6
7
SO20-2
5
16
SO20-7*
15
6
B
B
B
B
B
B
B
0
1
2
3
4
5
6
SO20-8**
7
14
&
E20-1 13
8
9
12
11
10
GND
2539 drw 02
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
*FCT245T/2245T, FCT645T only.
**FCT245T/2245T, FCT640T
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
2539 drw 03
FCT245T/2245T, FCT645T are non-inverting options.
FCT640T is the inverting options.
LCC
2539 drw 01
TOP VIEW
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
AUGUST 1995
1995 Integrated Device Technology, Inc.
6.9
DSC-4611/4
1