74FST3257
Quad 2:1 Multiplexer/
Demultiplexer Bus Switch
The ON Semiconductor 74FST3257 is a quad 2:1, high performance
multiplexer/demultiplexer bus switch. The device is CMOS TTL
compatible when operating between 4 and 5.5 Volts. The device
http://onsemi.com
MARKING
exhibits extremely low R and adds nearly zero propagation delay.
ON
The device adds no noise or ground bounce to the system.
DIAGRAMS
Features
16
• R t 4 W Typical
ON
16
• Less Than 0.25 ns−Max Delay Through Switch
• Nearly Zero Standby Current
FST3257G
AWLYWW
1
SOIC−16
D SUFFIX
• No Circuit Bounce
1
CASE 751B
• Control Inputs are TTL/CMOS Compatible
• Pin−For−Pin Compatible With QS3257, FST3257, CBT3257
• All Popular Packages: SOIC−16, TSSOP−16, QFN16
• These Devices are Pb−Free and are RoHS Compliant
16
16
FST
3257
ALYW G
G
1
TSSOP−16
DT SUFFIX
CASE 948F
V
S
1
CC
16
1
S
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1B
1B
OE
4B
2
3
4
5
6
7
15
14
1
1B
1
OE
4B
2
1
1B
2
1
GND
1
3257
ALYWG
G
1A
13 4B
2
1A
4B
2
2B
1
QFN16
4A
3B
2B
1
4A
12
MN SUFFIX
CASE 485AW
2B
2
1
2B
2
11 3B
1
2A
GND
3B
3A
2
2A
3B
2
10
8
9
A
= Assembly Location
= Year
WL, L = Wafer Lot
GND 3A
Y
WW, W = Work Week
Figure 1. 16−Lead Pinout Diagrams
G or G = Pb−Free Package
(Note: Microdot may be in either location)
PIN NAMES
Function
S
OE
H
Pin
OE , OE
Description
Bus Switch Enables
Select Inputs
Bus A
X
L
Disconnect
1
2
L
A = B
1
2
S , S
0
1
H
L
A = B
A
Figure 2. Truth Table
B , B , B , B
4
Bus B
1
2
3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
Publication Order Number:
June, 2011 − Rev. 7
74FST3257/D