PI3B3244 데이터 시트보기 (PDF) - Pericom Semiconductor
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PI3B3244 Datasheet PDF : 5 Pages
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3.3V, Hot Insertion,
8-Bit, 2-Port NanoSwitch™
Features
• Near-Zero propagation delay
• 5-ohm switches connect inputs to outputs when enabled
• Fast Switching Speed - 4.5ns max.
• Ultra-Low Quiescent Power (0.2µA Typical)
– Ideally suited for notebook applications
• Pin compatible with 74 series 244 logic devices
• Packaging:
– 20-pin 150-mil wide plastic QSOP (Q)
– 20-pin 173-mil wide plastic TSSOP (L)
Description
Pericom Semiconductor’s PI3B series of logic circuits are produced
using the Company’s advanced sub-micron CMOS technology,
achieving industry leading performance.
The 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. The bus switch
create no additional propagation delay or ground bounce noise.
Block Diagram
BE1
1A0
SW
1A1
SW
1A2
SW
1A3
SW
BE2
2A0
SW
2A1
SW
2A2
SW
2A3
SW
Pin Configuration
1B0
1B1
1B0
SW
1B1
A
B
2B0
BE
2B1
2B2
2B3
BE1
1A0
2B3
1A1
2B2
1A2
2B1
1A3
2B0
GND
1
20
2
19
3
18
4
17
5 20-Pin 16
6 Q,L 15
7
14
8
13
9
12
10
11
Vcc
BE2
1B0
2A3
1B1
2A2
1B2
2A1
1B3
2A0
Pin Description
Pin Name
Description
BEn
Bus Enable Input (Active LOW)
A0–7
Bus A
B0–7
Bus B
GND
Ground
VCC
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
1
PS8149F 08/25/04
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