74FST3244_06 Datasheet, PDF (1/7 Pages) ON Semiconductor – 8−Bit Bus Switch

74FST3244
8−Bit Bus Switch
The ON Semiconductor 74FST3244 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 two 4−bit switches with separate
Output/Enable (OE) pins. Port A is connected to Port B when OE is
low. If OE is high, the switch is high Z.
Features
• 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 QS3244, FST3244, CBT3244
• All Popular Packages: QSOP−20, TSSOP−20, SOIC−20
• All Devices in Package TSSOP are Inherently Pb−Free*
OE₁ 1
1A₀ 2
2B₃ 3
1A₁ 4
2B₂ 5
1A₂ 6
2B₁ 7
1A₃ 8
2B₀ 9
GND 10
20 V_CC
19 OE₂
18 1B₀
17 2A₃
16 1B₁
15 2A₂
14 1B₂
13 2A₁
12 1B₃
11 2A₀
Figure 1. 20−Lead Pinout
TRUTH TABLE
Inputs
OE₁ OE₂
L
L
L
H
H
L
H
H
Inputs/Outputs
1A, 1B
2A, 2B
1A = 1B
1A = 1B
Z
Z
2A = 2B
Z
2A = 2B
Z
http://onsemi.com
20
1
SOIC−20
DW SUFFIX
CASE 751D
MARKING
DIAGRAMS
20
FST3244
AWLYYWW
1
20
1
TSSOP−20
DT SUFFIX
CASE 948E
20
FST
3244
ALYW
1
20
1
QSOP−20
QS SUFFIX
CASE 492A
20
FST3244
AWLYWW
1
A
=
L, WL =
Y
=
W, WW =
PIN NAMES
Pin
OE₁, OE₂
1A, 2A
1B, 2B
Assembly Location
Wafer Lot
Year
Work Week
Description
Bus Switch Enables
Bus A
Bus B
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
June, 2006 − Rev. 2
Publication Order Number:
74FST3244/D