* Buffered inputs
* Wide operating voltage range: 2 V to 6 V
* Wide operating temperature range:
  –40°C to +85°C
* Supports fanout up to 10.

* Alarm / tamper detect circuit
* S-R latch 3 Description This device contains two independent 4-input NAND ga.

This device contains two independent 4-input NAND gates. Each gate performs the Boolean function Y = A
* B
* C
* D in positive logic. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) SN74HC20D SOIC (14) 8.70 mm × 3.90 mm .

SN54HC20

SN54HC20W

SN54HC21

SN54HC240

SN54HC241

SN54HC244

SN54HC245

SN54HC251

SN54HC251J

SN54HC253

SN54HC253J

SN54HC257

SN54HC258

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