74LS490 Dual Decade Counter/Binary Counter IC | Datasheet

74LS490 IC contains a pair of high-speed 4-stage ripple counters. Each half of the SN54 /74LS490 has individual Clock, Master Reset and Master Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code. The 74LS490 IC has a wide range of working voltage, a wide range of working conditions, offers a wide variety of features such as ESD protection & thermal overload protection, and directly interfaces with CMOS, NMOS, and TTL, making it very reliable to be used in high speed applications.

What is a Decade Counter?

A decade/BCD counter is a serial digital counter which can count up to 10 decimal digits. It goes through 10 unique combinations of output & RESETS for every new clock input. A BCD counter can count 0000, 0001, 0010, 1000, 1001, 1010, 1011, 1110, 1111, 0000, and 0001 and so on.

74LS490 Key Features & Specifications

• Function: Decade Counter
• Technology Family: LS
• VCC (Min): 4.75V
• VCC (Max): 5.25V
• IOL (Max): 16mA
• IOH (Max): -0.4mA
• Low Power: 90 mW Typical Dissipation
• Dual Versions of LS290 and LS293
• Individual Asynchronous Clear and Preset to 9 for Each Counter
• Count Frequency — Typically 65 MHz
• Input Clamp Diodes Limit High-Speed Termination Effects
• Operating temperature range: 0°C  to 70°C 
• Input type: TTL
• Output type: CMOS
• Rating: Catalog

74LS490 Pinout

Pin No.	Pin Name	Description
1	CPa’	Clock Pulse Input for counter a
2	MRa	Master Reset Input for counter a
3	Q0a	Counter a Output 0
4	MSa	Master Set Input for counter a
5	Q1a	Counter a Output 1
6	Q2a	Counter a Output 2
7	Q3a	Counter a Output 3
8	GND	Ground Pin
9	Q3b	Counter b Output 3
10	Q2b	Counter b Output 2
11	Q1b	Counter b Output 1
12	MSb	Master Set Input for counter b
13	Q0b	Counter b Output 0
14	MRb	Master Reset Input for counter b
15	CPb’	Clock Pulse Input for counter b
16	Vcc	Chip Supply Voltage

Applications

The 74LS490 Decade counter IC has a wide array of applications. Some of them are mentioned below:’

• Decade counters are generally used in devices such as clock circuits, frequency dividers, state machines, and sequencers, etc.

74LS490 Datasheet

You can download the datasheet for 74LS490 IC from the link given below:

See Also: 74LS153 Dual 4 To 1 Line Multiplexer IC – Datasheet | 74LS132 Quad 2-Input Schmitt trigger NAND Gate IC – Datasheet | 74LS47 BCD to 7-Segment Display Decoder IC – Datasheet