Integrated Device Technology, Inc.
FST163xxx 鈥?5鈩?/div>
FST163Pxxx 鈥?5鈩?with precharge
鈥?TTL-compatible input and output levels
鈥?ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
鈥?Available in SSOP, TSSOP and TVSOP
DESCRIPTION:
The FST163245/163P245 belong to IDT's family of Bus
switches. Bus switch devices perform the function of connect-
ing 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 and 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 FST163245 and FST163P245 are 16-bit TTL-compat-
ible bus switches. The
OE
pins provide enable control. The
FST163P245 supports precharge on the B port. So when
OE
is high, A and B ports are isolated and B outputs are precharged
to the bias voltage through the equivalent of a 10K鈩?resistor
(1B
1-8
precharged to VBIAS1 and 2B
1-8
precharged to V
BIAS1
).
FUNCTIONAL BLOCK DIAGRAM
V
BIAS1
1A
1
1A
1
1B
1
1A
8
1A
8
1B
8
1B
1
1B
8
V
BIAS1
2A
1
2B
1
2A
1
2B
1
2A
8
1OE
2OE
FST163245
2B
8
2A
8
1OE
2OE
FST163P245
2B
8
PIN DESCRIPTION
Pin Names
1A
1-8,
2A
1-8
1B
1-8,
2B
1-8
1
OE
, 2
OE
V
BIAS1
I/O
I/O
I/O
I
I
Description
Bus A
Bus B
Bus Switch Enable (Active LOW)
Precharge Reference Voltage
3513 tbl 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
3513 drw 01
COMMERCIAL TEMPERATURE RANGE
漏1997
Integrated Device Technology, Inc.
FEBRUARY 1997
DSC-3513/-
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