SN74HCS74 Schmitt-Trigger Input Dual D-Type Positive-Edge-Triggered Flip-Flops

With Clear and Preset

1 Features

• Wide operating voltage range: 2 V to 6 V

• Schmitt-trigger inputs allow for slow or noisy input

signals

• Low power consumption

– Typical input leakage current of ±100 nA

• ±7.8-mA output drive at 6 V

• Extended ambient temperature range: –40°C to

2 Applications

• Convert a momentary switch to a toggle switch

• Hold a signal during controller reset

• Input slow edge-rate signals

• Operate in noisy environments

• Divide a clock signal by two

3 Description

The device contains two independent D-type positive-

edge-triggered flip-flops. All inputs include Schmitt

triggers, allowing for slow or noisy input signals. A low

level at the preset ( PRE) input sets the output high. A

low level at the clear ( CLR) input resets the output

low. Preset and clear functions are asynchronous and

not dependent on the levels of the other inputs. When

PRE and CLR are inactive (high), data at the data (D)

input meeting the setup time requirements is

transferred to the outputs (Q, Q) on the positive-going

edge of the clock (CLK) pulse. Clock triggering occurs

at a voltage level and is not directly related to the rise

time of the input clock (CLK) signal. Following the

hold-time interval, data at the data (D) input can be

changed without affecting the levels at the outputs (Q,

Q).

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

SN74HCS74PW

TSSOP (14)

5.00 mm × 4.40 mm

SN74HCS74D

SOIC (14)

8.70 mm × 3.90 mm

SN74HCS74BQA(2)

WQFN (14)

3.00 mm × 2.50 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

This device is in Preview.

Input Voltage

Schmitt-trigger

CMOS Input

Response

Waveforms

Standard

CMOS Input

Response

Waveforms

Input Voltage

Input Voltage

Time

Time

Input Voltage

Waveforms

Low Power

Noise Rejection

Supports Slow Inputs

Time

Time

Time

Time

Benefits of Schmitt-trigger inputs

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SN74HCS74

SCLS782B – NOVEMBER 2019 – REVISED NOVEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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SN74HCS74

SCLS782B – NOVEMBER 2019 – REVISED NOVEMBER 2020

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.