FSTU3384 10-Bit Bus Switch with
May 1999
Revised December 1999
FSTU3384
10-Bit Bus Switch with
鈭?V
Undershoot Hardened Circuit (UHC铮? Protection
General Description
The Fairchild Switch FSTU3384 provides 10 bits of high-
speed CMOS TTL-compatible bus switches. The low on
resistance of the switch allows inputs to be connected to
outputs without adding propagation delay generating addi-
tional ground bounce noise. Both the A Ports and the B
Ports are 鈥渦ndershoot hardened鈥?with UHC铮?protection to
support an extended input range to 2.0V below ground.
Fairchild鈥檚 integrated Undershoot Hardened Circuit, UHC
senses undershoot at the I/Os, and responds by preventing
voltage differentials from developing and turning on the
switch. The device is organized as two 5-bit switches with
separate bus enable (OE) signals. When OE is LOW, the
switch is ON and Port A is connected to Port B. When OE
is HIGH, the switch is OPEN and a high-impedance state
exists between the two ports.
Features
s
4鈩?switch connection between two ports
s
Undershoot Hardened to -2.0V.
s
Minimal propagation delay through the switch
s
Low l
CC
.
s
Zero ground bounce in flow-through mode
s
Control inputs compatible with TTL level
s
See Applications Note AN-5008 for details.
Ordering Code:
Order Number
FSTU3384WM
FSTU3384QSC
FSTU3384MTC
Package Number
M24B
MQA24
MTC24
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MO-153 4.4mm Wide
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150鈥?Wide
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Names
OEA, OEB
A
0
鈥揂
9
B
0
鈥揃
9
Bus A
Bus B
Description
Bus Switch Enable
Truth Table
OEA OEB
L
L
H
H
L
H
L
H
B
0
鈥揃
4
A
0
鈥揂
4
A
0
鈥揂
4
B
5
鈥揃
9
A
5
鈥揂
9
HIGH-Z State
Function
Connect
Connect
Connect
Disconnect
HIGH-Z State A
5
鈥揂
9
HIGH-Z State HIGH-Z State
UHC铮?is a trademark of Fairchild Semiconductor Corporation.
漏 1999 Fairchild Semiconductor Corporation
DS500195
www.fairchildsemi.com
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