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FSTUD16450GX Folha de dados(PDF) 1 Page - Fairchild Semiconductor

Nome de Peças FSTUD16450GX
Descrição Electrónicos  Configurable 4-Bit to 20-Bit Bus Switch with -2V Undershoot Protection and Selectable Level Shifting
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2001 Fairchild Semiconductor Corporation
DS500391
www.fairchildsemi.com
January 2001
Revised August 2001
FSTUD16450
Configurable 4-Bit to 20-Bit Bus Switch with
-2V Undershoot Protection and Selectable Level Shifting
General Description
The Fairchild Universal Bus Switch FSTUD16450 provides
4-bit, 5-bit, 8-bit, 10-bit, 16-bit, 20-bit of high-speed 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 FSTUD16450 is designed to allow “customer” configu-
ration control of the enable connections. The device is
organized as either a 4-bit, 5-bit, 10-bit or 20-bit bus switch.
8-bit and 16-bit configurations are also achievable (see
Functional Description). The device's bit configuration is
chosen 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 “undershoot hardened” with UHC
protection to support an extended range to 2.0V below
ground.
Fairchild's integrated
“Undershoot
Hardened
Circuit” (UHC) senses undershoot at the I/O's, and
responds by preventing voltage differentials from develop-
ing and turning on the switch.
Another key device feature is the addition of a level shifting
select pin, “S2”. When S2 is LOW, the device behaves as a
standard N-MOS switch. When S2 is HIGH, a diode to VCC
is integrated into the circuit allowing for level shifting
between 5V inputs and 3.3V outputs.
Features
s Undershoot hardened to
−2V (A and B Ports)
s Voltage level shifting
s 4
Ω 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 Note AN-5008 for details
s Also packaged in plastic Fine-Pitch Ball Grid Array
(FBGA) (Preliminary)
Applications Note
Select pins S0, S1, S2 are intended to be used as static
user configurable control pins. The AC performance of
these pins has not been characterized or tested. Switching
of these select pins during system operation may tempo-
rarily disrupt output logic states and/or enable pin controls.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Note 1: BGA package available in Tape and Reel only.
UHC
 is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
FSTUD16450GX
(Note 1)
BGA54A
(Preliminary)
54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
[Tape and Reel]
FSTUD16450MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide


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