7447 BCD to 7-segment Decoder/Driver (Open Collector)

7447 BCD to 7-Segment Decoder/Driver (Open Collector) – Product Overview

The 7447 is a BCD (Binary-Coded Decimal) to 7-segment display decoder/driver IC with open-collector outputs. It converts 4-bit BCD inputs into signals that can drive common-anode 7-segment LED displays, making it ideal for numeric display applications.

⚙️ Key Features

• ✅ Converts 4-bit BCD input into 7-segment display output

• ✅ Open-collector outputs for direct driving of common-anode 7-segment LEDs

• ✅ Supports BCD inputs from 0000 to 1001 (0 to 9 decimal)

• ✅ Includes lamp test, ripple blanking input/output

• ✅ TTL compatible inputs and outputs

• ✅ Operates at standard 5V logic levels

• ✅ Available in DIP-16 package

📋 Specifications

🎯 Applications

• Digital clocks and timers

• Calculators

• Numeric displays in instruments

• Counters and measurement devices

• Any system requiring numeric display via 7-segment LEDs

📦 Package Includes

• 1 × 7447 BCD to 7-segment Decoder/Driver IC (Open Collector, DIP-16)

Photograph

Features

• Single BCD to 7-Segment Decoder with Open Collector Output
• Outputs Directly Interface to CMOS, NMOS and TTL
• Large Operating Voltage Range
• Wide Operating Conditions

Pin Layout

 

Pin Description

Pin Number	Description
1	BCD B Input
2	BCD C Input
3	Lamp Test
4	RB Output
5	RB Input
6	BCD D Input
7	BCD A Input
8	Ground
9	7-Segment e Output
10	7-Segment d Output
11	7-Segment c Output
12	7-Segment b Output
13	7-Segment a Output
14	7-Segment g Output
15	7-Segment f Output
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