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PI3B3244
Block Diagram
BE2
BE
1
1B1
1B0
1A1
1A0
1B1
1B0
1A3
1A2
2B1
2B0
2A1
2A0
2B3
2B2
2A3
2A2
B
A
BE
SW
SW
SW
SW
SW
SW
SW
SW
SW
Pin Configuration
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
BE
1
1
A
0
2
B
3
1
A
1
2
B
2
1
A
2
2
B
1
1
A
3
2
B
0
GND
Vcc
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
Description
Pericom Semiconductor’s PI3B series of logic circuits are pro-
duced using the Company’s advanced sub-micron CMOS tech-
nology, achieving industry leading performance.
e PI3B3244 features a set of 3.3V 8-bit bus switches, which is
pinout and function compatible with the P74FCT244T, 74F244,
and 74ALS/AS/LS2448-bit drivers. Two enable signals (BEn) turn
the switches on similar to the enable signals of the 244. e bus
switch create no additional propagation delay or ground bounce
noise.
Features
Î Near-Zero propagation delay
Î 5-ohm switches connect inputs to outputs
Î Fast Switching Speed: 4.5ns (max.)
Î Ultra-Low Quiescent Power (0.2μA Typical)
à Ideally suited for notebook applications
Î Packaging (Pb-free & Green):
à 20-pin 173-mil wide plastic TSSOP (L)
3.3V, Hot Insertion,
8-Bit, 2-Port Nan oSwitch
TM
Pin Description
Pin Name Description
BEn Bus Enable Input (Active LOW)
A0-7 Bus A
B0-7 Bus B
GND Ground
V
CC
Power
Truth Table
(1)
BE1 BE2 1A, 1B 2A, 2B
H H Disconnect Disconnect
L H 1A = 1B Disconnect
H L Disconnect 2A = 2B
L L 1A = 1B 2A = 2B
Note:
1. H = High Voltage Level, L = Low Voltage Level
11-0003
