Integrated Device Technology, Inc.
FAST CMOS OCTAL
IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT
• Common features:
– 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
– 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
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.
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
FCT245T/2245T, FCT645T are non-inverting options.
FCT640T is the inverting options.
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The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1995 Integrated Device Technology, Inc.
3 P20-1 18
4 D20-1 17
5 SO20-2 16
6 SO20-8** 15
7 & 14
8 E20-1 13
*FCT245T/2245T, FCT645T only.
3 2 20 19
1 18 B0
A4 6 L20-2 16 B2
9 10 11 12 13
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