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FSTUD32450 Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte FSTUD32450
Spiegazioni elettronici  Configurable 4-Bit to 40-Bit Bus Switch with -2V Undershoot Protection and Selectable Level Shifting
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2005 Fairchild Semiconductor Corporation
DS500447
www.fairchildsemi.com
August 2001
Revised October 2006
FSTUD32450
Configurable 4-Bit to 40-Bit Bus Switch with
2V Undershoot Protection and Selectable Level Shifting
General Description
The Fairchild Universal Bus Switch FSTUD32450 provides
4-bit, 5-bit, 8-bit, 10-bit, 16-bit, 20-bit...40-bit of high-speed
CMOS TTL-compatible bus switching. The low On Resis-
tance of the switch allows inputs to be connected to outputs
without adding propagation delay or generating additional
ground bounce noise.
The FSTUD32450 is designed to allow “customer” configu-
ration control of the enable connections. The device can be
organized as either a ten 4-bit, eight 5-bit, four 10-bit, two
20-bit or one 40-bit enabled bus switch. Also achievable
are 8-bit and 16-bit enabled configurations (see Functional
Description). The device's bit configuration is controlled
through select pin logic. (see Truth Table). When OEx is
LOW, Port Ax is connected to Port Bx. When OEx is HIGH,
the switch is OPEN.
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®
¥) senses undershoot at the I/O, and responds by
preventing voltage differentials from developing and turning
the switch on.
Another innovative device feature is the addition of a level
shifting select pin, “S2 and S5”. When S2 and S5 are LOW,
the device behaves as a standard N-MOS switch. When S2
and S5 are HIGH, a diode to VCC is integrated into the cir-
cuit allowing for level shifting between 5V inputs and 3.3V
outputs.
Features
s Undershoot protected to
2V (A and B Ports)
s Voltage level shifting
s 4
: switch connection between two ports
s Minimal propagation delay through the switch
s Low lCC
s Zero bounce in flow-through mode
s Control inputs compatible with TTL level
s See Applications Notes AN-5008 and AN-5021 for UHC
details
s Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
Applications Note
Select pins S0, S1, S2, S3, S4 and S5 are intended to be
used as static user configurable control pins. The AC per-
formance of these pins has not been characterized or
tested. Switching of these select pins during system opera-
tion may temporarily disrupt output logic states and/or
enable pin controls.
40-bit configuration can be achieved by connecting the
OE1 and the OE6 pins to together.
Ordering Code:
Note 1: Ordering code “G” indicates Trays.
Note 2: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
UHC®
¥ is a registered trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
FSTUD32450G
(Note 1)(Note 2)
BGA114A
114-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide


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