74FST3251 Datasheet, PDF (1/8 Pages) ON Semiconductor – 8:1 Multiplexer/Demultiplexer Bus Switch

74FST3251
8:1 Multiplexer/
Demultiplexer Bus Switch
The ON Semiconductor 74FST3251 is an 8:1, 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.
• R_ON t 4 W Typical
• Less Than 0.25 ns–Max Delay Through Switch
• Nearly Zero Standby Current
• No Circuit Bounce
• Control Inputs are TTL/CMOS Compatible
• All Popular Packages: QSOP–16, TSSOP–16, SOIC–16
B4
1
B3
2
16
V_CC
15
B5
B2
3
B1
4
14
B6
13
B7
A
5
12
B8
NC
6
11
S0
OE
7
10
S1
GND
8
9
S2
QSOP/SSOP/TSSOP
TOP VIEW
Inputs
OE
S2
S1
S0
Function
L
L
L
L
A Port = B1 Port
L
L
L
H
A Port = B2 Port
L
L
H
L
A Port = B3 Port
L
L
H
H
A Port = B4 Port
L
H
L
L
A Port = B5 Port
L
H
L
H
A Port = B6 Port
L
H
H
L
A Port = B7 Port
L
H
H
H
A Port = B8 Port
H
X
X
X
Disconnect
NOTE: H = HIGH Voltage Level, L = LOW Voltage Level, X = Don’t Care
© Semiconductor Components Industries, LLC, 2002
1
January, 2002 – Rev. 1
http://onsemi.com
MARKING
DIAGRAMS
16
16
1
SO–16
FST3251
AWLYWW
D SUFFIX
CASE 751B
1
16
1
TSSOP–16
DT SUFFIX
CASE 948F
16
FST
3251
ALYW
1
16
16
1
QSOP–16
QS SUFFIX
CASE 492
S3251
ALYW
1
A
= Assembly Location
L, WL = Wafer Lot
Y
= Year
W, WW = Work Week
PIN NAMES
Pin
OE₁, OE₂
S₀, S₁
A
B₁, B₂, B₃, B₄
Description
Bus Switch Enables
Select Inputs
Bus A
Bus B
ORDERING INFORMATION
Device
Package
74FST3251D
SO–16
74FST3251DR2
SO–16
74FST3251DT TSSOP–16
74FST3251DTR2 TSSOP–16
74FST3251QS
QSOP–16
74FST3251QSR QSOP–16
Shipping
48 Units/Rail
2500 Units/Reel
96 Units/Rail
2500 Units/Reel
96 Units/Rail
2500 Units/Reel
Publication Order Number:
74FST3251/D