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SN74HCS21
SCLS793A – MARCH 2020 – REVISED JUNE 2020
SN74HCS21 Dual 4-Input AND Gates with Schmitt-Trigger Inputs
1 Features
•1 Wide operating voltage range: 2 V to 6 V • Schmitt-trigger inputs allow for slow or noisy input
signals • Low power consumption
– Typical ICC of 100 nA – Typical input leakage current of ±100 nA • ±7.8-mA output drive at 5 V • Extended ambient temperature range: –40°C to +125°C, TA
2 Applications
• Combining power good signals • Enable digital signals
3 Description
This device contains two independent 4-input AND gates with Schmitt-trigger inputs. Each gate performs the Boolean function Y = A ● B ● C ● D in positive logic.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN74HCS21PWR
TSSOP (14) 5.00 mm × 4.40 mm
SN74HCS21DR
SOIC (14)
8.70 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Benefits of Schmitt-trigger Inputs
Low Power
Noise Rejection
Supports Slow Inputs
Input Voltage
Input Voltage
Input Voltage
Input Voltage
Waveforms
Input Voltage
Time
Time
Standard CMOS Input
Output Current Voltage
Output Current Voltage
Supply Current
Response
Waveforms
Input Voltage
Time
Time
Schmitt-trigger CMOS Input
Output Current Voltage
Output Current Voltage
Supply Current
Response
Waveforms
Input Voltage
Time
Time
1
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.
SN74HCS21
SCLS793A – MARCH 2020 – REVISED JUNE 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions....................... 4 6.4 Thermal Information .................................................. 4 6.5 Electrical Characteristics........................................... 4 6.6 Switching Characteristics .......................................... 5 6.7 Typical Characteristics .............................................. 5 7 Parameter Measurement Information .................. 6 8 Detailed Description .............................................. 7 8.1 Overview ................................................................... 7 8.2 Functional Block Diagram ......................................... 7
8.3 Feature Description................................................... 7 8.4 Device Functional Modes.......................................... 8 9 Application and Implementation .......................... 9 9.1 Application Information.............................................. 9 9.2 Typical Application .................................................... 9 10 Power Supply Recommendations ..................... 12 11 Layout................................................................... 12 11.1 Layout Guidelines ................................................. 12 11.2 Layout Example .................................................... 12 12 Device and Documentation Support ................. 13 12.1 Documentation Support ........................................ 13 12.2 Related Links ........................................................ 13 12.3 Community Resources.......................................... 13 12.4 Trademarks ........................................................... 13 12.5 Electrostatic Discharge Caution ............................ 13 12.6 Glossary ................................................................ 13 13 Mechanical, Packaging, and Orderable Information ........................................................... 13
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (March 2020) to Revision A
Page
• Added D package to data sheet ............................................................................................................................................ 1 • Added D Package to Thermal Information Table ................................................................................................................... 4
2
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5 Pin Configuration and Functions
SN74HCS21
SCL.