SN54AHC74, SN74AHC74

SCLS255K – DECEMBER 1995 – REVISED DECEMBER 2013

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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Table 1. Function Table (Each Flip-Flop)

INPUTS

OUTPUTS

PRE

CLR

CLK

D

Q

Q

L

H

X

X

H

L

H

L

X

X

L

H

L

L

X

X

H

H

↑

H

H

L

H

H

↑

L

L

H

H

H

L

X

(1)

This configuration is unstable; that is, it does not persist when PRE or CLR returns to its inactive (high)

level.

2

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