7442 BCD to Decimal Decoder

7442 BCD to Decimal Decoder – Product Overview

The 7442 is a BCD (Binary-Coded Decimal) to decimal decoder IC that converts 4-bit BCD inputs into one of ten mutually exclusive outputs. It is commonly used for driving decimal display devices or as a digital decoder in various logic applications.

⚙️ Key Features

• ✅ Decodes 4-bit BCD input into 10 decimal outputs (0–9)

• ✅ Outputs are active LOW (open-collector or open-drain type)

• ✅ TTL compatible inputs and outputs

• ✅ Operating voltage: 5V typical TTL logic

• ✅ Can be used for driving displays or logic circuitry

• ✅ Available in DIP-16 package for easy prototyping

📋 Specifications

🎯 Applications

• Driving decimal display units

• Digital clocks and counters

• Data decoding in digital systems

• Logic circuit design and debugging

• Address decoding and multiplexing

📦 Package Includes

• 1 × 7442 BCD to Decimal Decoder IC (DIP-16)

Photograph

Features

• Single 7-Segment to BCD Decoder
• Outputs Directly Interface to CMOS, NMOS and TTL
• Large Operating Voltage Range
• Wide Operating Conditions
• Not Recommended for New Designs

Pin Layout

 

Pin Description

Pin Number	Description
1	Decimal 0 Output
2	Decimal 1 Output
3	Decimal 2 Output
4	Decimal 3 Output
5	Decimal 4 Output
6	Decimal 5 Output
7	Decimal 6 Output
8	Ground
9	Decimal 7 Output
10	Decimal 8 Output
11	Decimal 9 Output
12	BCD D Input
13	BCD C Input
14	BCD B Input
15	BCD A Input
16	Vcc – Positive Supply

Dimensional Drawing

 

Technical Data

Absolute Maximum Ratings

Supply Voltage	7V
Input Voltage	5.5V
Operating Free Air Temperature	0°C to +70°C
Storage Temperature Range	-65°C to +150°C

 

Recommended Operating Conditions

Symbol	Parameter	Min	Typ	Max	Units
Vcc	Supply Voltage	4.75	5	5.25	V
Vih	HIGH Level Input Voltage	2			V
Vil	LOW Level Input Voltage			0.8	V
Ioh	HIGH Level Output Current			-0.4	mA
Iol	LOW Level Output Current			16	mA
Ta	Free Air Operating Temperature	0		70	°C

 

Electrical Characteristics

Symbol	Parameter	Conditions	Min	Typ	Max	Units
Vi	Input Clamp Voltage	Vcc=Min Ii=-12mA			-1.5	V
Voh	HIGH Level Output Voltage	Vcc=Min Ioh=MAX Vil=MAX	2.4	3.4		V
Vol	LOW Level Output Voltage	Vcc=Min Iol=MAX Vih=MAX		0.2	0.4	V
Ii	Input Current@MAX Input Voltage	Vcc=Max Vi=5.5V			1	mA
Iih	HIGH Level Input Current	Vcc=Max Vi=2.4V			40	µA
Iil	LOW Level Input Current	Vcc=Max Vi=0.4V			-1.6	mA
Ios	Short Circuit Output Current	Vcc=Max	-18		-55	mA
Icch	Supply Current with Outputs HIGH	Vcc=Max		4	8	mA
Iccl	Supply Current with Outputs LOW	Vcc=Max		12	22	mA

 

Switching Characteristics at Vcc=5V,Ta=25°C

Symbol	Parameter	Conditions	Min	Typ	Max	Units
tplh	Propagation Delay Time LOW-to-HIGH Level Output	Cl=15pF Rl=400R			22	nS
tphl	Propagation Delay Time HIGH-to-LOW Level Output	Cl=15pF Rl=400R			15	nS