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PI74FCT245T Datasheet, PDF (1/4 Pages) Pericom Semiconductor Corporation – Fast CMOS Octal Bidirectional Transceivers
PI74FCT245T/640T/645T
PI74FCT2245T/2640T/2645T
(25Ω Series) 1122334455667788990011223344556677889900112233445566778899001122112233445566778899001122334455667788990011223344556677889900112211223344556677889900112233445566778899001122334455667788990011221122334455667788990011223344556677889900112233445566778899001122112233445566778899001122
Fast CMOS Octal
Bidirectional Transceivers
Product Features
• PI74FCT245/640/645TandPI74FCT2245/2640T/2645Tarepin
compatible with bipolar FAST™ Series at a higher speed and
lower power consumption
• 25 Ohm series resistor on all outputs (FCT2XXX only)
• TTL input and output levels
• Low ground bounce outputs
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 20-pin 173 mil wide plastic TSSOP (L)
– 20-pin 300 mil wide plastic DIP (P)
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 150 mil wide plastic TQSOP (R)
– 20-pin 300 mil wide plastic SOIC (S)
– 20-pin 209 mil wide plastic SSOP (H)
• Device models available on request
Logic Block Diagram
T/R
OE
A0
B0
A1
Product Description
Pericom Semiconductor’s PI74FCT series of logic circuits are
produced using the Company’s advanced 0.6/0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25 Ohm series resistor on all
outputs to reduce noise because of reflections, thus eliminating the
need for an external terminating resistor.
The PI74FCT245T/640T/645T and PI74FCT2245T/2640T/2645T are
8-bit wide octal buffer bidirectional transceivers 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.
Product Pin Configuration
T/R 1
20 Vcc
A0 2
19 OE
A1 3
18 B0
A2 4 20-Pin 17 B1
A3 5 L,P,Q 16 B2
A4 6 R,S,H 15 B3
A5 7
14 B4
A6 8
13 B5
A7 9
12 B6
GND 10
11 B7
B1
Product Pin Description
A2
Pin Name
Description
B2
OE
3-State Output Enable Inputs (Active LOW)
A3
T/R
Transmit/Receive Input
A0-A7
Side A Inputs or 3-State Outputs
B3
B0-B7
Side B Inputs or 3-State Outputs
A4
GND
Ground
B4
VCC
Power
A5
Truth Table(1)
B5
Inputs
A6
OE T/R
Outputs
B6
L
L
Bus B Data to Bus A(2)
A7
L
H
Bus A Data to Bus B(2)
B7
H
X
High Z State
FCT245, 2245, 645, 2645 are non-inverting options.
FCT640 & FCT2640 are inverting options.
1. H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
2. 640 is inverting from input to output.
1
PS2012B
09/22/99
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