CDx4HC27 Triple 3-Input NOR Gates

1 Features

• Buffered inputs

• Wide operating voltage range: 2 V to 6 V

• Wide operating temperature range:

–55°C to +125°C

• Supports fanout up to 10 LSTTL loads

• Significant power reduction compared to LSTTL

logic ICs

2 Applications

• Alarm / tamper detect circuit

• S-R latch

3 Description

This device contains three independent 3-input NOR

gates. Each gate performs the Boolean function

Y = A + B + C in positive logic.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

CD74HC27M

SOIC (14)

8.70 mm × 3.90 mm

CD74HC27E

PDIP (14)

19.30 mm × 6.40 mm

CD54HC27F

CDIP (14)

21.30 mm × 7.60 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

1B

1A

2A

2B

2C

2Y

GND

1C

V

CC

1Y

3C

3B

3A

3Y

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Functional pinout

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CD74HC27, CD54HC27

SCHS132D – AUGUST 1997 – REVISED APRIL 2021

Copyright © 2021 Texas Instruments Incorporated

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Product Folder Links: CD74HC27 CD54HC27

CD74HC27, CD54HC27

SCHS132D – AUGUST 1997 – REVISED APRIL 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.