21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C3244
Product Features
聲 Near zero propagation delay
聲 High Bandwidth (>400 MHz)
聲 Rail-to-Rail 3.3V or 2.5V Switching
聲 5V I/O Tolerant
聲 2.5V Supply Voltage Operation
聲 Permits Hot Insertion
聲 Pin compatible with 74 series 244 logic devices
聲 Packages available:
聳 20-pin 150 mil wide plastic QSOP (Q)
聳 20-pin 173 mil wide plastic TSSOP (L)
Product Description
2.5V/3.3V, High Bandwidth, Hot Insertion,
8-Bit, 2-Port Bus Switch
Pericom Semiconductor聮s PI3C series of logic circuits are produced
using the Company聮s advanced submicron CMOS technology,
achieving industry leading performance.
The PI3C3244 features a set of 2.5V or 3.3V 8-bit bus switches,
which is a 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. It is very useful in switching signals that have high
bandwidth (>400 MHz).
Logic Block Diagram
*-
)
)
)
)
!
*-
)
)
)
)
!
*
*
*
*
!
*
*
*
*
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
2
B
0
GND
1
20
2
19
3
18
4
20-Pin
17
5
L,Q
16
6
15
7
14
8
13
9
12
10
11
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
Truth Table
(1)
BE1
H
L
BE2
H
H
L
L
1A, 1B
Disconnect
1A = 1B
Disconnect
1A = 1B
2A, 2B
Disconnect
Disconnect
2A = 2B
2A = 2B
Product Pin Description
Pin Name
BEn
A0聳7
B0聳7
GND
V
CC
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
H
L
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
PS8149B
12/10/99
PERICOM
1
2
3
4
