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74FST3400
4−Bit, 4−Port Bus Exchange
Switch
The ON Semiconductor 74FST3400 is a 4−bit, 4−port bus exchange
switch. The device is CMOS TTL compatible when operating between
4.0 and 5.5 Volts. The device exhibits extremely low RON and adds
nearly zero propagation delay. The device adds no noise or ground
bounce to the system.
Features
• RON 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 QS3400, FST3400, CBT3400
• All Popular Packages: SOIC−24, TSSOP−24, QSOP−24
• All Devices in Package TSSOP are Inherently Pb−Free*
BE
C0
A0
B0
D0
C1
A1
B1
D1
BX0
BX1
GND
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
VCC
D3
B3
A3
C3
D2
B2
A2
C2
NC
BX3
BX2
Figure 1. 24−Lead Pinout
TRUTH TABLE
BE BX0 BX1 BX2 BX3 A0−3 B0−3
Function
H X X X X Hi−Z Hi−Z Disconnect
L
BXi = L
C0−3 D0−3
Connect
L
BXi = H
D0−3 C0−3 Exchange
NOTE: H = HIGH Voltage Level, L = LOW Voltage Level, X = Don’t Care,
NOTE: Hi−Z = High Impedance, i = 0, 1, 2 or 3
*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, 2005
January, 2005 − Rev. 5
1
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MARKING
DIAGRAMS
24
1
SOIC−24
DW SUFFIX
CASE 751E
24
FST3400
AWLYWW
1
24
1
TSSOP−24
DT SUFFIX
CASE 948H
24
FST
3400
ALYW
1
24
1
QSOP−24
QS SUFFIX
CASE 492B
24
FST3400
AWLYYWW
1
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN NAMES
Pin
BE
Ax, Bx, Cx, Dx
OE1, OE2
OE1, OE2
OE1, OE2
OE1, OE2
OE1, OE2
OE1, OE2
OE1, OE2
Description
Bus Enable Input (Active LOW)
Bus A, Bus B, Bus C, Bus D
Bus Exchange (Bit 0)
Bus Exchange (Bit 1)
Bus Exchange (Bit 2)
Bus Exchange (Bit 3)
No Connect
Ground
Power
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Publication Order Number:
74FST3400/D
74FST3400
A0
B0
A1
B1
A2
B2
A3
B3
C0
D0
C1
D1
C2
D2
C3
D3
BX0
BX1
BX2
BX3
BE
Figure 2. Logic Diagram
ORDERING INFORMATION
Device Order Number
74FST3400DW
Package
SOIC−24
Shipping†
48 Units / Rail
74FST3400DWR2
SOIC−24
2500 Units / Tape & Reel
74FST3400DT
TSSOP−24*
(Pb−Free)
96 Units / Rail
74FST3400DTR2
TSSOP−24*
(Pb−Free)
2500 Units / Tape & Reel
74FST3400QS
QSOP−24
96 Units / Rail
74FST3400QSR
QSOP−24
2500 Units / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
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