PI74FCT245TQEX Datasheet, PDF (1/7 Pages) Pericom Semiconductor Corporation – Fast CMOS Octal Bidirectional Transceivers

PI74FCT245T
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Fast CMOS Octal Bidirectional Transceivers
Features
• Pin compatible with bipolar FAST™ Series at a higher speed
and lower power consumption
• 25-ohm series resistor on all outputs (FCT2245Tonly)
• 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
• Packaging (Pb-free & Green Available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 300-mil wide plastic SOIC (S)
– 20-pin 209-mil wide plastic SSOP (H)
– 20-pin 150-mil wide plastic QSOP (Q)
Block Diagram
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
Description
Pericom Semiconductor’s PI74FCT245T and PI74FCT2245T 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 Hi-Z condition.
PI74FCT2245T has 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.
Pin Configuration
T/R 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND ₁₀
20 Vcc
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 ^B7
Pin Description
Pin Name
Description
OE
3-State Output Enable Inputs (Active LOW)
T/R
Transmit/Receive Input
A0-A7
Side A Inputs or 3-State Outputs
B0-B7
Side B Inputs or 3-State Outputs
GND
Ground
V_CC
Power
Truth Table⁽¹⁾
Inputs
OE T/R
Outputs
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H X High Z State
1. H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
06-0207
1
PS2012E 08/08/06