Fairchild Semiconductor FSTU16211 Datasheet
FSTU16211
Preliminary
FSTU16211 24-Bit Bus Switch with
May 2001
Revised May 2001
24-Bit Bus Switch with
−2V Undershoot Protection
(Preliminary)
General Description
The Fairchild Sw itch FSTU162 11 provides 24-bits of hi ghspeed CMOS TTL-compatible bus switching. The low On
Resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
additional ground bounce noise.
The device is organ ized as a 12-bit or 24-bit b us switch.
When OE
nected to Port 1B. When OE
to Port 2B. The A and B Ports are protected against under-
shoot to support an extend ed rang e to 2.0V be low gr ound.
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 1A is con-
1
) senses undershoot at the I/O and responds by
is LOW, Port 2A is connected
2
Ordering Code:
Order Number Package Number Package Description
FSTU16211MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also availab l e in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Features
■ Undershoot hardened to −2V (A and B Ports)
■ Slower output enable times to prevent signal disruption
■ 4
Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Low l
CC
■ Zero bounce in flow-through mode
■ Control inputs compatible with TTL level
■ See Applications Note AN-5008 for details
−
2V Undershoot Protection (Preliminary)
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2001 Fairchild Semiconductor Corporation DS500389 www.fairchildsemi.com
Preliminary
Logic Diagram
FSTU16211
Truth Table
OE
1
LL1A
LH1A
HLZ2A
HHZZ
Inputs Inputs/Outputs
OE
1A, 1B 2A, 2B
2
= 1B 2A = 2B
= 1B Z
= 2B
Connection Diagram
Pin Descriptions
Pin Name Description
OE
, OE
1
2
1A, 2A Bus A
1B, 2B Bus B
Bus Switch Enables
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