74ALVC16821MTD View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

74ALVC16821MTD

Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs

Fairchild Semiconductor 

Connection Diagram

Logic Diagrams

Truth Tables

Inputs

Outputs

CLK1

OE1

D0–D9

O0–O9

X

H

L

X

L

Z

L



L

H

H

L or H

L

X

O0

Inputs

Outputs

CLK2

OE2

D10–D19 O10–O19

X

H

X

Z



L

L

L



L

H

H

L or H

L

X

O0

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial (HIGH or LOW, inputs may not float)

Z = High Impedance

O0 = Previous O0 before LOW-to-HIGH transition of Clock

= LOW-to-HIGH transition

Functional Description

The 74ALVC16821 contains twenty D-type flip-flops with

3-STATE standard outputs. The device is byte controlled

with each byte functioning identically, but independent of

each other. Control pins can be shorted together to obtain

full 20-bit operation. The following description applies to

each byte. The twenty flip-flops will store the state of their

individual D-type inputs that meet the setup and hold time

requirements on the LOW-to-HIGH Clock (CLK) transition.

The 3-STATE standard outputs are controlled by the Out-

put Enable (OEn) input. When OEn is HIGH, the standard

outputs are in the high impedance mode but this does not

interfere with entering new data into the flip-flops.

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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