SN74HCS74-Q1 Automotive Schmitt-Trigger Input Dual D-Type Positive-Edge-

Triggered Flip-Flops With Clear and Preset

1 Features

• AEC-Q100 Qualified for automotive applications:

– Device temperature grade 1:

– Device HBM ESD Classification Level 2

– Device CDM ESD Classifcation Level C6

• 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

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-Q1

TSSOP (14)

5.00 mm × 4.40 mm

SN74HCS74D-Q1

SOIC (14)

8.70 mm × 3.90 mm

SN74HCS74BQA-Q1

WQFN (14)

3.00 mm × 2.50 mm

SN74HCS74DYY-Q1

SOT-23-THIN (14)

2.00 mm x 4.20 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

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

SN74HCS74-Q1

SCES894E – APRIL 2019 – REVISED DECEMBER 2021

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. PRODUCTION DATA.