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FSTU3125M Folha de dados(PDF) 1 Page - Fairchild Semiconductor

Nome de Peças FSTU3125M
Descrição Electrónicos  4-Bit Bus Switch with -2V Undershoot Protection
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSTU3125M Folha de dados(HTML) 1 Page - Fairchild Semiconductor

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© 2001 Fairchild Semiconductor Corporation
DS500449
www.fairchildsemi.com
June 2001
Revised August 2001
FSTU3125
4-Bit Bus Switch with
−2V Undershoot Protection
General Description
The Fairchild Switch FSTU3125 provides four high-speed
CMOS TTL-compatible bus switches. 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 A and B Ports are
protected against undershoot to support an extended
range to 2.0V below ground. Fairchild’s integrated Under-
shoot Hardened Circuit (UHC
) senses undershoot at the
I/O and responds by preventing voltage differentials from
developing and turning the switch on.
The device is organized as four 1-bit switches with sepa-
rate OE inputs. When OE is LOW, the switch is ON and
Port A is connected to Port B. When OE is HIGH, the
switch is OPEN and a high-impedance state exists
between the two ports.
Features
s Undershoot hardened to
−2V (A and B Ports)
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 application notes AN-5008 and AN-5021 for details
on undershoot
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignment for SOIC and TSSOP
Pin Assignment for QSOP
Pin Descriptions
Truth Table
Order Number
Package Number
Package Description
FSTU3125M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
FSTU3125QSC
MQA16
16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
FSTU3125MTC
MTC14
14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Name
Description
OE1, OE2, OE3, OE4
Bus Switch Enables
1A, 2A, 3A, 4A
Bus A
1B, 2B, 3B, 4B
Bus B
NC
Not Connected
Inputs
Inputs/Outputs
OE
A,B
LA
= B
HZ


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