 Semiconductor Components Industries, LLC, 2001
August, 2001 – Rev. 0
1 Publication Order Number:
74FST3245/D
74FST3245
8-Bit Bus Switch
The ON Semiconductor 74FST3245 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. Port A is connected to Port B
when OE is low. If OE is high, the switch is high Z.
• 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 QS3245, FST3245, CBT3245
• All Popular Packages: QSOP–20, TSSOP–20, SOIC–20
NC
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
L
H
Input OE Function
Connect
Disconnect
TRUTH TABLE
2
19
9
18
11
OE
Figure 2. Logic Diagram
A
0
A
7
B
0
B
7
Description
PIN NAMES
OE
1
, OE
2
1A, 2A
http://onsemi.com
Device Package Shipping
ORDERING INFORMATION
74FST3245DW SO–20 38 Units/Rail
74FST3245DWR2 SO–20
74FST3245DT TSSOP–20
1000 Units/Reel
75 Units/Rail
74FST3245DTR2 TSSOP–20 2500 Units/Reel
74FST3245QS QSOP–20 55 Units/Rail
74FST3245QSR QSOP–20 2500 Units/Reel
TSSOP–20
DT SUFFIX
CASE 948E
SO–20
DW SUFFIX
CASE 751D
20
MARKING
DIAGRAMS
Pin
Bus Switch Enables
Bus A
1B, 2B Bus B
20
1
1
FST3245
AWLYYWW
1
20
20
1
FST
3245
ALYW
A = Assembly Location
L, WL = Wafer Lot
Y = Year
W, WW = Work Week
QSOP–20
QS SUFFIX
CASE 492A
1
20
FST3245
AWLYWW
20
1