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PI5C32244
Product Features
聲 Near zero propagation delay
聲 25ohm series resistor termination
聲 Direct bus connection when switches are ON
聲
聲
Ultra Low Quiescent Power (0.2碌A(chǔ) Typical)
聳 Ideally suited for notebook applications
Pin compatible with 74 Series 244 logic devices
Product Description
8-bit, 2-Port BusSwitch
with 25ohm Series Resistor
聲 Packages available:
聳 20-pin 150 mil wide plastic QSOP (Q)
Logic Block Diagram
BE
1
1A
0
1A
1
1A
2
1A
3
1B
0
1B
1
1B
2
1B
3
Pericom Semiconductor聮s PI5C series of logic circuits are produced
in the Company聮s advanced submicron CMOS technology, achieving
industry leading performance.
The PI5C32244 features a set of eight bus switches which is pinout
and function compatible with the PI74FCT244T, 74F244, and
74ALS/AS/LS 244 8-bit drivers. Two enable signals (BEn) turn the
switches on similar to the enable signals of the 244. The bus switch
creates no additional propagation delay or ground bounce noise.
The device has a built-in 25ohm resistor to reduce noise resulting
from reflections, thus eliminating the need for an external terminating
resistor.
Product Pin Configuration
BE
1
1
A
0
2
B
3
1
A
1
2
B
2
1
A
2
2
B
1
1
A
3
1
2
20
19
V
CC
BE
2
1
B
0
2
A
3
1
B
1
2
A
2
1
B
2
2
A
1
1
B
3
2
A
0
3
18
4
17
5
20-Pin
16
Q
6
15
7
8
9
10
14
13
12
11
BE
2
2A
0
2A
1
2A
2
2A
3
2B
0
2B
1
2B
2
2B
3
2
B
0
GND
Product Pin Description
Pin Name
BEn
A
0
-A
3
B
0
-B
3
GND
V
CC
Description
Bus Output Enable (Active LOW)
Bus A
Bus B
Ground
Power
Truth Table
(1)
BE
1
H
L
H
L
BE
2
H
H
L
L
1A, 1B
Disconnect
1A = 1B
Disconnect
1A = 1B
2A, 2B
Disconnect
Disconnect
2A = 2B
2A = 2B
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
PS8145
11/07/97
1
2
3
