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PI74ALVCH16721 Datasheet(PDF) 1 Page - Pericom Semiconductor Corporation

Part No. PI74ALVCH16721
Description  3.3V 20-Bit Flip-Flop with 3-STATE Outputs
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Manufacturer  PERICOM [Pericom Semiconductor Corporation]
Direct Link  http://www.pericom.com
Logo PERICOM - Pericom Semiconductor Corporation

PI74ALVCH16721 Datasheet(HTML) 1 Page - Pericom Semiconductor Corporation

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PS8090C 02/07/00
Product Description
Pericom Semiconductor’s PI74ALVCH series of logic circuits are
produced in the Company’s advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The PI74ALVCH16721 is a 20-bit flip-flop with 3-state outputs
designed specifically for 2.3V to 3.6V VCC operation. The
PI74ALVCH16721 is designed with edge-triggered D-type flip-
flops with qualified clock storage. On the positive transition of
clock (CLK) input, the device provides true data at the Q outputs,
provided that the clock-enable (CLKEN) input is LOW. If CLKEN
is HIGH, no data is stored.
A buffered output-enable (OE) input can be used to place the
20 outputs in either a normal logic state (HIGH or LOW level) or
a high-impedance state. In the high-impedance state, the outputs
state and increased drive provide the capacity to drive bus lines
without the need for interface or pullup components. OE does not
affect the internal operation of the flip-flops. Old data can be
retained or new data can be entered while the outputs are in the
high-impedance state.
To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pullup resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
The PI74ALVCH16721 data has “Bus Hold” which retains the
data input’s last state whenever the data input goes to high-
impedance preventing “floating” inputs and eliminating the need
for pullup/down resistors.
Product Features
• PI74ALVCH16721 is designed for low voltage operation
• VCC = 2.3V to 3.6V
• Hysteresis on all inputs
• Typical VOLP (Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
• Typical VOHV (Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
• Bus Hold retains last active bus state during 3-STATE,
eliminating the need for external pullup resistors
• Industrial operation at –40°C to +85°C
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
Logic Block Diagram
3.3V 20-Bit Flip-Flop
with 3-STATE Outputs

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