PI74FCT16841T Datasheet, PDF (1/6 Pages) Pericom Semiconductor Corporation – Fast CMOS 20-Bit Transparent Latch

PI74FCT16841T/162841T
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PI74FCT162841T
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Fast CMOS 20-Bit ¹
Transparent Latch
Product Features:
2
Common Features:
• PI74FCT16841T and PI74FCT162841T are high-speed, low
power devices with high current drive
• VCC =5V±10%
• Hysteresis on all inputs
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
PI74FCT16841T Features:
• High output drive: IOH = –32 mA; IOL = 64 mA
• Power off disable outputs permit “live insertion”
• Typical VOLP (Output Ground Bounce) < 1.0V
at VCC = 5V, TA = 25°C
PI74FCT162841T Features:
• Balanced output drivers: ±24 mA
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are pro-
3 ^{duced in the Company’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
4 ^{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
5 ^{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
6 ^{impedance backplanes and include a Power-Off Disable function}
allowing “live insertion” of boards when the devices are used as
backplane drivers.
• Reduced system switching noise
• Typical VOLP (Output Ground Bounce) < 0.6V
at VCC = 5V, TA = 25°C
The PI74FCT162841T has ±24 mA balanced output drivers. It is
7 ^{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.
8
Logic Block Diagram
9
1OE
1LE
1D1
D
C
2OE
2LE
2D1
D
1Q1
C
10
11
2Q1
12
To 9 other channels
13
To 9 other channels
14
15
1
PS2078A 01/15/95