Datasheet

SN54AHC74, SN74AHC74
SCLS255K –DECEMBER 1995–REVISED DECEMBER 2013 www.ti.com
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
(1)
H
(1)
H H ↑ H H L
H H ↑ L L H
H H L X Q
0
Q
0
(1) This configuration is unstable; that is, it does not persist when PRE or CLR returns to its inactive (high)
level.
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