Fairchild Semiconductor FSTU32X384 Datasheet
FSTU32X384
20-Bit Low Power Bus Switch
with
−2V Undershoot Protection
FSTU32X384 20-Bit Low Power Bus Switch with
May 2002
Revised June 2002
General Description
The Fairchild Switch FSTU32X384 provides 20 bits of highspeed CMOS TTL-compatib le bus switches. The low On
Resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
additional ground bou nce noise. The device is organ ized
as four 5-bit switches with separate b us enable (OE
nals. When OE
nected to Port B. When OE
and a high-impedance state exists between the two ports.
The A and B Ports are protected against undershoot to
support an extended range to 2.0V below ground.
Fairchild’s integrated Undershoot Hardened Circuit
(UHC
preventing voltage differentials from developing and turning the switch on.
is LOW, the switch is ON and Port A is con-
is HIGH, the switch is OPEN
) senses undershoot at the I/O and responds by
) sig-
Features
■ 4Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Ultra low power with
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
■ See Application Note AN-5008 for details on
FSTU - Undershoot Protected Fairchild Switch Family
< 0.1 µA typical I
CC
Ordering Code:
Order Number
FSTU32X384QSP MQA48A 48-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Package
Number
Package Descript ion
Logic Diagram
−
2V Undershoot Protection
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2002 Fairchild Semiconductor Corporation DS500705 www.fairchildsemi.com
Pin Descriptions
Pin Names Description
FSTU32X384
Truth Table
Inputs Inputs/Outputs
OE
X
ABus A
BBus B
OE
X
LA = B
HZ
Bus Switch Enable
A, B
Connection Diagram
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