PI74FCT645TL View Datasheet(PDF) - Pericom Semiconductor
Part Name
Description
MFG CO.
PI74FCT645TL Datasheet PDF : 4 Pages
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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 Semiconductors PI74FCT series of logic circuits are
produced using the Companys 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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