PI74FCT3245 Datasheet, PDF (1/4 Pages) Pericom Semiconductor Corporation – Fast CMOS 3.3V 8-Bit Bidirectional Transceiver

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Fast CMOS 3.3V 8-Bit
Bidirectional Transceiver
Product Features
• Advanced Low Power CMOS Operation
• Compatible with LVC class of products
• Compatible with industry standard
octal pinouts
• Excellent output drive capability:
Balanced Drives (24 mA sink and source)
• Can serve as a 5V to 3V translator
• Inputs can be driven by 3.3V or 5V devices
• Low ground bounce outputs
• 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 150 mil wide plastic QSOP(Q)
-20-pin 150 mil wide plastic TQSOP(R)
-20-pin 300 mil wide plastic SOIC(S)
Product Description
Pericom Semiconductor’s PI74FCT3 series of logic circuits are
produced in the Company’s advanced 0.6 micron CMOS
technology, achieving industry leading speed grades.
The PI74FCT3245 is an 8-bit bidirectional transceiver designed
for asynchronous two-way communication between data buses.
The transmit/receive input pin (T/R) 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 PI74FCT3245 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed
3.3V/5.0V system.
Logic Block Diagram
T/
A0
A1
A2
A3
A4
1A5
A6
A7
Product Pin Configuration
T/R 1
20 VCC
OE
A0
A1
2
3
19
20-PIN
L20
18
OE
B0
A2 4 _Q20 ^{17 B1}
B0
A3 5 _R20 ^{16 B2}
A4 6 _S20 ^{15 B3}
A5 7
14 B4
A6 8
13 B5
B1
A7 9
12 B6
GND 10
11 B7
B2
Product Pin Description
Pin Name
OE
T/R
A7-A0
B7-B0
GND
VCC
Description
3-State Output Enable
Inputs (Active LOW)
Direction Control Input
Side A Inputs or
3-State Outputs
Side B Inputs or
3-State Outputs
Ground
Power
B3
Truth Table
Inputs⁽¹⁾
B4
OE
T/R
Outputs⁽¹⁾
L
L
Bus B Data to Bus A
B5
L
H
Bus A Data to Bus B
H
X
High StateZ
Note:
B6
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
B7
1
PS7068C 8/22/97