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FSTUD162450MTD Datenblatt(PDF) 1 Page - Fairchild Semiconductor

Teilenummer FSTUD162450MTD
Bauteilbeschribung  Configurable 4-Bit to 20-Bit Bus Switch with -2V Undershoot Protection and Selectable Level Shifting and 25??Series Resistors in Outputs
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2001 Fairchild Semiconductor Corporation
DS500469
www.fairchildsemi.com
April 2001
Revised August 2001
FSTUD162450
Configurable 4-Bit to 20-Bit Bus Switch with
−2V Undershoot Protection and Selectable Level Shifting
and 25
Ω Series Resistors in Outputs
General Description
The Fairchild Universal Bus Switch FSTUD162450 pro-
vides 4-bit, 5-bit, 8-bit, 10-bit, 16-bit, 20-bit of high-speed
CMOS TTL-compatible bus switching. The low On Resis-
tance of the switch allows inputs to be connected to out-
puts without adding propagation delay or generating
additional ground bounce noise.
The FSTUD162450 is designed to allow “customer” config-
uration control of the enable connections. The device can
be organized as either a five 4-bit, four 5-bit, two 10-bit or
one 20-bit bus switch. Also available 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 con-
nected 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 turn-
ing the switch on.
Another innovative 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 protected to
−2V (A and B Ports)
s Voltage level shifting
s 25
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 Notes AN-5008 and AN-5021
for UHC 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
FSTUD162450GX
(Note 1)
BGA54A
Preliminary
54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
[Tape and Reel]
FSTUD162450MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide


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