鈭?/div>
Bus switches provide zero delay paths
Extended commercial range of 鈥?0擄C to +85擄C
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)
Available in QSOP, SOIC, SSOP, TSSOP, and PDIP Packages
Hot insertion capability
Very low power dissipation
DESCRIPTION:
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 V
CC
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 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.
FUNCTIONAL BLOCK DIAGRAM
1
OE
1
A
0
1
A
1
1
A
2
1
A
3
1
B
0
1
B
1
1
B
2
1
B
3
PIN CONFIGURATION
1
OE
1
A
0
2
B
3
1
2
3
4
5
6
7
8
9
10
P20-1
SO20-2
SO20-8
SO20-9
SO20-7
20
19
18
17
16
15
14
13
12
11
Vcc
2
OE
1
B
0
2
A
3
1
B
1
2
A
2
1
B
2
2
A
1
1
A
1
2
B
2
1
A
2
2
B
1
1
A
3
2
B
0
2
OE
2
A
0
2
A
1
2
A
2
2
A
3
2
B
0
2
B
1
1
B
3
2
A
0
GND
2
B
2
2
B
3
QSOP/ SOIC/ SSOP/ TSSOP/ PDIP
TOP VIEW
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
OCTOBER 1999
DSC-5522/-
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