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PI3B3251
3.3V, 8:1 Mux/Demux BusSwitch
Product Features
鈥?Near zero propagation delay
鈥?5 Ohm switches connect inputs to outputs
鈥?Ultra Low Quiescent Power (0.1碌A(chǔ) Typical)
鈥?Ideally suited for notebook applications
鈥?Pin compatible with 74 series 251 logic devices
鈥?Packages available:
鈥?16-pin 150 mil wide plastic QSOP (Q)
鈥?16-pin 150 mil wide plastic SOIC (W)
鈥?16-pin 173 mil wide plastic TSSOP (L)
Product Description
Pericom Semiconductor鈥檚 PI3B series of logic circuits are produced
using the Company鈥檚 advanced sub micron CMOS technology,
achieving industry leading performance.
The PI3B3251 is a 3.3V Dual 8:1 Multiplexer/demultiplexer with three-
state outputs that is pinout compatible with the PI74FCT251T,
74F251, and 74ALS/AS/LS 251. Inputs can be connected to outputs
with low on resistance (5 Ohm) with no additional ground bounce
noise or propagation delay.
Logic Block Diagram
I0
I1
I2
I3
I4
I5
I6
I7
Product Pin Configuration
16
15
I
3
I
2
I
1
I
0
Y
NC
E
GND
1
V
CC
I
4
I
5
I
6
I
7
S
0
S
1
S
2
E
S0
S1
S2
2
16-Pin
3
Q, W, L
14
13
4
12
5
11
6
10
7
9
8
Product Pin Description
Y
Pin Name
I
0
鈥?/div>
7
S
0
鈥?/div>
2
E
Y
GND
V
CC
Description
Data Inputs
Select Inputs
Enable
Data Outputs
Ground
Power
Truth Table
(1)
E
H
L
L
L
L
L
L
L
L
S
2
X
L
L
L
L
H
H
H
H
Select
S
1
X
L
L
H
H
L
L
H
H
S
0
X
L
H
L
H
L
H
L
H
Y
Hi-Z
I0
I1
I2
I3
I4
I5
I6
I7
Function
Disable
S2-0 = 0
S2-0 = 1
S2-0 = 2
S2-0 = 3
S2-0 = 4
S2-0 = 5
S2-0 = 6
S2-0 = 7
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
PS8150D
05/15/01
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2
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