74HC datasheet(2/9 Pages) PHILIPS

2 / 9 page

1997 Nov 25

Philips Semiconductors

Product speciﬁcation

Dual JK ﬂip-ﬂop with set and reset;

positive-edge trigger

74HC/HCT109

FEATURES

• J, K inputs for easy D-type flip-flop

• Toggle flip-flop or “do nothing” mode

• Output capability: standard

• ICC category: flip-flops

GENERAL DESCRIPTION

The 74HC/HCT109 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT109 are dual positive-edge triggered, JK

flip-flops with individual J, K inputs, clock (CP) inputs, set

(SD) and reset (RD) inputs; also complementary Q and Q

outputs.

The set and reset are asynchronous active LOW inputs

and operate independently of the clock input.

The J and K inputs control the state changes of the

flip-flops as described in the mode select function table.

The J and K inputs must be stable one set-up time prior to

the LOW-to-HIGH clock transition for predictable

operation.

The JK design allows operation as a D-type flip-flop by

tying the J and K inputs together.

Schmitt-trigger action in the clock input makes the circuit

highly tolerant to slower clock rise and fall times.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD = CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V.

ORDERING INFORMATION

See

“74HC/HCT/HCU/HCMOS Logic Package Information”.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HCT

tPHL/ tPLH

propagation delay

CL = 15 pF;

VCC = 5 V

nCP to nQ, nQ15

nSD to nQ, nQ12

nRD to nQ, nQ12

fmax

maximum clock frequency

MHz

input capacitance

3.5

CPD

power dissipation

capacitance per ﬂip-ﬂop

notes 1 and 2

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