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74173

Quad D-type flip-flop; positive-edge trigger; 3-state

Philips Electronics 

Philips Semiconductors

Quad D-type flip-flop; positive-edge trigger; 3-state

Product specification

74HC/HCT173

Fig.4 Functional diagram.

FUNCTION TABLE

REGISTER OPERATING MODES

reset (clear)

parallel load

hold (no change)

INPUTS

MR CP E1 E2 Dn

H X XX X

L↑ ll l

L↑ ll h

LX

LX

hX X

Xh X

OUTPUTS

Qn (register)

L

L

H

qn

qn

3-STATE BUFFER OPERATING MODES

read

disabled

INPUTS

OUTPUTS

Qn (register) OE1 OE2 Q0 Q1 Q2 Q3

L

L L LLLL

H

L L HHHH

X

H X ZZZZ

X

X H ZZZZ

Notes

1. H = HIGH voltage level

h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition

L = LOW voltage level

I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition

q = lower case letters indicate the state of the referenced input (or output)

one set-up time prior to the LOW-to-HIGH CP transition

X = don’t care

Z = high impedance OFF-state

↑ = LOW-to-HIGH CP transition

December 1990

4

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