IDT74FST3244
OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
OCTAL BUS SWITCH
IDT74FST3244
FEATURES:
DESCRIPTION:
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The FST3244 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 resistance 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.
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Bus switches provide zero delay paths
Low switch on-resistance
TTL-compatible input and output levels
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
Hot insertion capability
Very low power dissipation
Available in QSOP, SOIC, SSOP, and TSSOP Packages
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 FST3244 is an octal TTL-compatible bus switch. The OE pins
provide output enable control for all 8 bits. This device is pin-compatible
with and functionally similar to the FCT244T.
PIN CONFIGURATION
FUNCTIONAL BLOCK DIAGRAM
1 OE
1 OE
1
20
Vcc
1A 0
1B 0
1A 0
2
19
2 OE
1A 1
1B 1
2B 3
3
18
1B 0
1A 2
1B 2
1A 1
4
17
2A 3
1A 3
1B 3
2B 2
5
16
1B 1
1A 2
6
15
2A 2
2B 1
7
14
1B 2
1A 3
8
13
2A 1
2B 0
9
12
1B 3
10
11
2A 0
2 OE
2A 0
2B 0
2A 1
SO20-2
SO20-8
SO20-9
SO20-7
2B 1
GND
2A 2
2B 2
2A 3
2B 3
QSOP/ SOIC/ SSOP/ TSSOP
TOP VIEW
INDUSTRIAL TEMPERATURE RANGE
APRIL 2001
1
c
2001
Integrated Device Technology, Inc.
DSC-5522/-
