 Semiconductor Components Industries, LLC, 2005
January, 2005 − Rev. 2
1 Publication Order Number:
74FST3253/D
74FST3253
Dual 4:1 Multiplexer/
Demultiplexer Bus Switch
The ON Semiconductor 74FST3253 is a dual 4:1, high performance
multiplexer/demultiplexer bus switch. The device is CMOS TTL
compatible when operating between 4 and 5.5 Volts. The device
exhibits extremely low R
ON
and adds nearly zero propagation delay.
The device adds no noise or ground bounce to the system.
Features
• R
ON
4 Typical
• Less Than 0.25 ns−Max Delay Through Switch
• Nearly Zero Standby Current
• No Circuit Bounce
• Control Inputs are TTL/CMOS Compatible
• Pin−For−Pin Compatible With QS3253, FST3253, CBT3253
• All Popular Packages: QSOP−16, TSSOP−16, SOIC−16
• All Devices in Package TSSOP are Inherently Pb−Free*
1B
3
1A
1B
1
1B
2
1B
4
OE
1
V
CC
S
0
OE
2
GND 2A
1
2
3
4
5
6
7
16
15
14
13
12
11
10
89
Figure 1. 16−Lead
Pinout
Figure 2. Truth Table
S1
2B
4
2B
3
2B
2
2B
1
X
X
L
L
H
H
S
1
Function
X
X
L
H
L
H
S
0
H
X
L
L
L
L
OE
1
X
H
L
L
L
L
OE
2
Disconnect 1A
Disconnect 2A
A = B
1
A = B
2
A = B
3
A = B
4
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
Description
PIN NAMES
OE
1
, OE
2
S
0
, S
1
A = Assembly Location
L, WL = Wafer Lot
Y = Year
W, WW = Work Week
TSSOP−16
DT SUFFIX
CASE 948F
16
1
QSOP−16
QS SUFFIX
CASE 492
SOIC−16
D SUFFIX
CASE 751B
16
1
1
16
FST3253
AWLYWW
MARKING
DIAGRAMS
16
1
Pin
Bus Switch Enables
Select Inputs
A Bus A
B
1
, B
2
, B
3
, B
4
Bus B
16
1
1
16
FST
3253
ALYW
S3253
ALYW
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
http://onsemi.com