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EXTENDED COMMERCIAL TEMPERATURE RANGE

IDT74ALVCH162721

3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS

MARCH 1999

1999 Integrated Device Technology, Inc.

DSC-4566/-

c

IDT74ALVCH162721

EXTENDED COMMERCIAL TEMPERATURE RANGE

3.3V CMOS 20-BIT

FLIP-FLOP WITH 3-STATE

OUTPUTS AND BUS-HOLD

FEATURES:

–

0.5 MICRON CMOS Technology

–

ESD > 2000V per MIL-STD-883, Method 3015;

> 200V using machine model (C = 200pF, R = 0)

–

0.635mm pitch SSOP, 0.50mm pitch TSSOP,

and 0.40mm pitch TVSOP packages

–

Extended commercial range of – 40°C to + 85°C

–

CMOS power levels (0.4µ W typ. static)

–

Rail-to-Rail output swing for increased noise margin

APPLICATIONS:

• 3.3V High Speed Systems

• 3.3V and lower voltage computing systems

Functional Block Diagram

DESCRIPTION:

This 20-bit flip-flop is built using advanced dual metal CMOS technol-

ogy. The 20 flip-flops of the ALVCH162721 are edge-triggered D-type

flip-flops with qualified clock storage. On the positive transition of the

clock (CLK) input, the device provides true data at the Q outputs if the

clock-enable (CLKEN) input is low. If CLKEN is high, no data is stored.

A buffered output-enable (OE) input places the 20 outputs in either a

normal logic state (high or low) or a high-impedance state. In the high-

impedance state, the outputs neither load nor drive the bus lines

significantly. The high-impedance state and increased drive provide the

capability to drive bus lines without need for interface or pullup compo-

nents. 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.

The ALVCH162721 has series resistors in the device output structure

which will significantly reduce line noise when used with light loads. This

driver has been designed to drive ±12mA at the designated threshold

levels.

The ALVCH162721 has “bus-hold” which retains the inputs’ last state

whenever the input goes to a high impedance. This prevents floating

inputs and eliminates the need for pull-up/down resistor.

Drive Features for ALVCH162721:

–

Balanced Output Drivers: ±12mA

–

Low switching noise

CLK

OE

CLKEN

1

56

29

55

CE

C1

1D

2

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