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PI74FCT16841T/162841T
20-BIT TRANSPARENT LATCH
PI74FCT16841T
PI74FCT162841T
Fast CMOS 20-Bit
Transparent Latch
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Product Features
Common Features
聲 PI74FCT16841T and PI74FCT162841T are high-speed, low
power devices with high current drive
聲 V
CC
= 5V 鹵10%
聲 Hysteresis on all inputs
聲 Packages available:
聳 56-pin 240 mil wide plastic TSSOP (A)
聳 56-pin 300 mil wide plastic SSOP (V)
PI74FCT16841T Features
聲 High output drive: I
OH
= 聳32 mA; I
OL
= 64 mA
聲 Power off disable outputs permit 聯(lián)live insertion聰
聲 Typical V
OLP
(Output Ground Bounce) < 1.0V
at V
CC
= 5V, T
A
= 25擄C
PI74FCT162841T Features
聲 Balanced output drivers: 鹵24 mA
聲 Reduced system switching noise
聲 Typical V
OLP
(Output Ground Bounce) < 0.6V
at V
CC
= 5V, T
A
= 25擄C
Product Description
Pericom Semiconductor聮s PI74FCT series of logic circuits are pro-
duced in the Company聮s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT16841T and PI74FCT162841T are 20-bit wide transparent
latches designed to provide temporary storage of data and can be
used as I/O ports, memory address latches, and bus drivers. The
Output Enable and Latch Enable controls allow the devices to be
operated as two 10-bit latches or one 20-bit latch. Signal pins are
arranged in a flow-through organization for ease of layout and
hysteresis is designed into all inputs to improve noise margin.
The output buffers on the PI74FCT16841T and PI74FCT162841T are
especially designed for driving high-capacitance loads and low
impedance backplanes and include a Power-Off Disable function
allowing 聯(lián)live insertion聰 of boards when the devices are used as
backplane drivers.
The PI74FCT162841T has 鹵24 mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
Logic Block Diagram
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OE
1
LE
1
D
1
9
2
OE
2
LE
10
D
C
2
Q
1
D
C
1
Q
2
D
1
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12
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To 9 other channels
To 9 other channels
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PS2078A 01/15/95
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