PI5C3244
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
8-Bit, 2-Port Switch
Features:
Description:
•
•
•
•
Near-Zero propagation delay
5-ohm switches connect inputs to outputs when enabled
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2μA typical)
– Ideally suited for notebook applications
• Pin compatible with 74 Series 244 logic devices
• Packaging (Pb-free & Green Available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 150-mil wide plastic QSOP (Q)
– 20-pin 300-mil wide plastic SOIC (S)
Pericom Semiconductor’s PI5C3244 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.
Block Diagram
Pin Configuration
BE1
1B0
1A1
BE1
1A0
2B3
1B1
1A2
20
19
18
VCC
BE2
1B0
4
5
6
17
16
15
2A3
7
8
14
13
1B2
9
10
12
11
1B3
2B2
1B2
1A3
1
2
3
1A1
1A0
1B3
1A2
2B1
1A3
2B0
BE2
GND
2A0
2A0
2B2
2A3
2A1
2B1
2A2
2A2
2B0
2A1
1B1
2B3
Truth Table(1)
BE1
H
L
H
L
BE2
H
H
L
L
Pin Description
1A, 1B
Disconnect
1A = 1B
Disconnect
1A = 1B
2A, 2B
Disconnect
Disconnect
2A = 2B
2A = 2B
Pin Name
BEn
A0-A3
B0-B3
GND
VCC
Note: 1. H = High Voltage Level
L = Low Voltage Level
06-0239
1
Description
Bus Output Enable (Active LOW)
Bus A
Bus B
Ground
Power
PS7014E
05/12/06