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PDF IDT74FST3257 Data sheet ( Hoja de datos )

Número de pieza IDT74FST3257
Descripción BUS SWITCH
Fabricantes Integrated Device Technology 
Logotipo Integrated Device Technology Logotipo



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QUAD 2:1 MUX/DEMUX
BUS SWITCH
IDT74FST3257
wwwP.DRaEtaLShIMeeItN4UA.cRomY
Integrated Device Technology, Inc.
FEATURES:
• Bus switches provide zero delay paths
• Extended commercial range of –40°C to +85°C
• Low switch on-resistance:
FST3xxx – 5
• TTL-compatible input and output levels
• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
• Available in QSOP and SOIC
DESCRIPTION:
The FST3257 belongs to IDT's family of Bus switches. Bus
switch devices perform the function of connecting or isolating
two ports without providing any inherent current sink or source
capability. Thus they generate little or no noise of their own
while providing a low resistance path for an external driver.
These devices connect input and output ports through an n-
channel FET. When the gate-to-source junction of this FET is
adequately forward-biased the device conducts or the resis-
tance between input and output ports is small. Without
adequate bias on the gate-to-source junction of the FET, the
FET is turned off, therefore with no VCC applied, the device
has hot insertion capability.
The low on-resistance and simplicity of the connection
between input and output ports reduces the delay in this path
to close to zero.
The FST3257 provides a 4-bit 2:1 multiplexer/demultiplexer.
The S pin controls the mux select and the E pin serves as the
switch enable.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATION
I0A
I1A
I0B-D
I1B-D
S
ZA
ZB-D
3 Channels
E
3257 drw 01
PIN DESCRIPTION
Pin Names
I0A-I0D
I/O
I/O
I1A-I1D
I/O
EI
SI
ZA-ZB
I/O
Description
Port 0
Port 1
Switch Enable (Active Low)
Mux Select
Port Z
3257 tbl 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGES
©1996 Integrated Device Technology, Inc.
10.3
S
I0A
I1A
ZA
I0B
I1B
ZB
GND
1
2
3
4
5
6
7
8
SO16-1
SO16-7
16 Vcc
15 E
14 I0C
13 I1C
12 ZC
11 10D
10 I1D
9 ZD
SOIC/QSOP
TOP VIEW
3257 drw 02
AUGUST 1996
DSC-3257/3
1

1 page




IDT74FST3257 pdf
IDT54/74FST3257
QUAD 2:1 MUX/DEMUX BUS SWITCH
ORDERING INFORMATION
IDT XX
FST XX
Temp. Range Device Type
X
Package
COMMERCIAL TEMPERATURE RANGES
www.DataSheet4U.com
SO Small Outline IC (SO16-1)
Q Quarter-size Small Outline Package (SO16-7)
3257
Quad 2:1 Mux/Demux Bus Switch
74 –40°C to +85°C
3257 drw 08
10.3 5

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