 Semiconductor Components Industries, LLC, 2005
January, 2005 − Rev. 1
1 Publication Order Number:
74FST3345/D
74FST3345
8-Bit Bus Switch
The ON Semiconductor 74FST3345 is an 8−bit, high performance
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.
The device consists of an 8−bit switch with two Output/Enable pins
(OE and OE).
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 QS3345, FST3345, CBT3345
• All Popular Packages: QSOP−20, TSSOP−20, SOIC−20
• All Devices in Package TSSOP are Inherently Pb−Free*
OE
A
2
A
5
A
4
A
3
A
1
A
0
V
CC
B
1
B
4
B
3
B
2
B
0
OE
1
2
3
4
5
6
7
20
19
18
17
16
15
14
Figure 1. 20−Lead Pinout
A
6
8
A
7
9
GND 10
B
5
13
B
6
12
B
7
11
OE
X
Inputs
H
L
OE
L
X
H
Connect
Connect
Function
TRUTH TABLE
Disconnect
9
1
11
OE
Figure 2. Logic Diagram
A
7
B
7
218
A
0
B
0
19
OE
*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
1A, 2A
TSSOP−20
DT SUFFIX
CASE 948E
SOIC−20
DW SUFFIX
CASE 751D
MARKING
DIAGRAMS
Pin
Bus Switch Enables
Bus A
1B, 2B Bus B
20
1
FST3345
AWLYYWW
1
20
20
1
FST
3345
ALYW
A = Assembly Location
L, WL = Wafer Lot
Y = Year
W, WW = Work Week
QSOP−20
QS SUFFIX
CASE 492A
1
20
FST3345
AWLYWW
20
1
20
1
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
ORDERING INFORMATION
http://onsemi.com