74HC21 Datasheet – Dual 4-input AND Gate ( PDF )

Part Number : 74HC21

Function : Dual 4-input AND Gate

Package : DIP, SOP 14 Pin Type

Manufacturers : Philips Electronics ( https://www.nxp.com/ )

Pinouts :

74HC21 datasheet

 

Description :

The 74HC21 is a high-speed Si-gate CMOS device and is pin compatible with low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The device provide the 4-input AND function.

Features :

1. Output capability: standard

2. ICC category: SSI

PIN DESCRIPTION :

PIN NO. SYMBOL NAME AND FUNCTION

1, 9 1A, 2A data inputs
2, 10 1B, 2B data inputs
3, 11 n.c. not connected
4, 12 1C, 2C data inputs
5, 13 1D, 2D data inputs
6, 8 1Y, 2Y data outputs
7 GND ground (0 V)
14 VCC positive supply voltage

 

Other data sheets within the file :

74HC21D, 74HC21DB, 74HC21N, 74HC21NB

74HC21 Datasheet PDF Download

74HC21 pdf

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7408 Datasheet – Quad 2-Input AND Gates – DM7408

This post explains for the TTL IC.

Part Number : 7408, DM7408

Function : Quad 2-Input AND Gates

Package : DIP, SOP 14 Pin Type

Manufactures : Fairchild

See the preview image and the 7408 Datasheet file for more information.

7408 Pinout

7408 Pinout

Description :

This device contains four independent gates each of which performs the logic AND function.

Fuction Table ( Y= AB )

A   B    Y
L    L    L
L    H   L
H   L    L
H   H   H

Recommended Operating Conditions

1. VCC : Supply Voltage = 4.75 5 5.25 V
2. VIH : HIGH Level Input Voltage = 2 V
3. VIL : LOW Level Input Voltage = 0.8 V
4. IOH : HIGH Level Output Current = −0.8 mA
5. IOL : LOW Level Output Current = 16 mA
6. TA : Free Air Operating Temperature = 0 70 °C

Absolute Maximum Ratings

7408 Datasheet

7408 Datasheet

 

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