74FST3245 Datasheet, PDF (1/8 Pages) ON Semiconductor – 8-Bit Bus Switch

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 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
• Pin–For–Pin Compatible with QS3245, FST3245, CBT3245
• All Popular Packages: QSOP–20, TSSOP–20, SOIC–20
NC 1
A₀ 2
A₁ 3
A₂ 4
A₃ 5
A₄ 6
A₅ 7
A₆ 8
A₇ 9
GND 10
20 V_CC
19 OE
18 B₀
17 B₁
16 B₂
15 B₃
14 B₄
13 B₅
12 B₆
11 B₇
Figure 1. 20–Lead Pinout
OE ¹⁹
2
A₀
18
B₀
9
A₇
11
B₇
Figure 2. Logic Diagram
TRUTH TABLE
Input OE
L
H
Function
Connect
Disconnect
© Semiconductor Components Industries, LLC, 2001
1
August, 2001 – Rev. 0
http://onsemi.com
20
1
SO–20
DW SUFFIX
CASE 751D
MARKING
DIAGRAMS
20
FST3245
AWLYYWW
1
20
1
TSSOP–20
DT SUFFIX
CASE 948E
20
FST
3245
ALYW
1
20
1
QSOP–20
QS SUFFIX
CASE 492A
20
FST3245
AWLYWW
1
A
= Assembly Location
L, WL = Wafer Lot
Y
= Year
W, WW = Work Week
PIN NAMES
Pin
OE₁, OE₂
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
ORDERING INFORMATION
Device
74FST3245DW
Package
SO–20
74FST3245DWR2 SO–20
74FST3245DT TSSOP–20
74FST3245DTR2
74FST3245QS
74FST3245QSR
TSSOP–20
QSOP–20
QSOP–20
Shipping
38 Units/Rail
1000 Units/Reel
75 Units/Rail
2500 Units/Reel
55 Units/Rail
2500 Units/Reel
Publication Order Number:
74FST3245/D