DATA SHEET
SNx4HC20 Dual 4-Input NAND Gates
1 Features
- 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 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
2 Applications
- Alarm / tamper detect circuit
- S-R latch
3 Description
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 |
| SN74HC20N | PDIP (14) | 19.30 mm × 6.40 mm |
| SN74HC20NS | SO (14) | 10.20 mm × 5.30 mm |
| SN74HC20PW | TSSOP (14) | 5.00 mm × 4.40 mm |
| SN54HC20J | CDIP (14) | 21.30 mm × 7.60 mm |
| SN54HC20W | CFP (14) | 9.20 mm × 6.29 mm |
| SN54HC20FK | LCCC (20) | 8.90 mm × 8.90 mm |
(1) For all available packages, see the orderable addendum at the
end of the data sheet.
Functional pinout4 Revision History
Changes from Revision F (August 2003) to Revision G (April 2021)
5 Pin Configuration and Functions
Figure 5-1 D, N, NS, PW, J, or W Package14-Pin SOIC, PDIP, SO, TSSOP, CDIP, or CFP
Top View
Figure 5-2 FK Package20-Pin LCCC
Top View
Pin Functions
| PIN | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | D, N, NS, PW, J, or W | FK | ||
| 1A | 1 | 2 | Input | Channel 1, Input A |
| 1B | 2 | 3 | Input | Channel 1, Input B |
| NC | 3, 11 | 1, 4, 5, 7, 11, 15, 16, 17 | — | Not internally connected |
| 1C | 4 | 6 | Input | Channel 1, Input C |
| 1D | 5 | 8 | Input | Channel 1, Input D |
| 1Y | 6 | 9 | Output | Channel 1, Output Y |
| GND | 7 | 10 | — | Ground |
| 2Y | 8 | 12 | Output | Channel 2, Output Y |
| 2A | 9 | 13 | Input | Channel 2, Input A |
| 2B | 10 | 14 | Input | Channel 2, Input B |
| 2C | 12 | 18 | Input | Channel 2, Input C |
| 2D | 13 | 19 | Input | Channel 2, Input D |
| VCC | 14 | 20 | — | Positive Supply |
