74LS90 7490 4-BIT Binary Decade BCD Counter IC
74LS90 7490 4-BIT Binary Decade BCD Counter IC - Image 2
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74LS90 7490 4-BIT Binary Decade BCD Counter IC

₨84.00

74LS90 Binary Counter Features

It is used as a simple counter from 0 – 9.
The IC has the ability to start from 0 and end at 9 automatically.
IC can be used any TTL based device and microcontroller due to its TTL output.
The IC has low power consumption.
IC comes in multiple packages, PDSO, PDIP, and GDIP
The IC has internal protection from clamp voltages.

SPECIFICATION

The Power input range for IC is 4.75 to 5.25.
The operating temperature range for IC is 0 to 70.
The input voltages range for IC at HIGH state is 2.0 minimum and the LOW state is 0.7 maximum.
IC draws output current at HIGH state is -0.4mA and for the LOW state is 8.0mA
The internal clamp diode protection range is -1.5V.

More information is available in the datasheet:
74LS90 DATASHEET

SKU: 1582 Categories: , ,

74LS90 is basically a MOD-10 decade counter that generate a BCD output code. It consists of four master-slave JK flip-flop, which are internally connected to provide MOD-2 (count to 2) counter and MOD-5 counter. 74LS90 also have an independent toggle JK flip-flop by CLKA and other three are driven by the CLKB.
 
Internal Logic Diagram

 
74LS90 Pin Configuration

Pin No.
Pin Name
Description

1
CLKB
Clock Input 2

2
R1
Reset 1

3
R2
Reset 2

4
NC
Not Connected

5
Vcc
Positive Supply Input

6
R3
Reset 3

7
R4
Reset 4

8
Qc
Output Pin 3

9
Qb
Output Pin 2

10
Gnd
Ground

11
Qd
Output Pin 4

12
Qa
Output Pin 1

13
NC
Not Connected

14
CLKA
Clock Input 1

 

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