CD4520 Dual Binary Up Counter

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CD4520 belongs to the CD4000 IC family. CD4520 consists of dual synchronous 4-stage up counters. the counters are constructed using D – type flip flops with interchangeable CLOCK and ENABLE lines for incrementing on either the positive going or negative going transition. For single unit operation, the ENABLE input is maintained high and the counter advances on each positive-going transition of the CLOCK. These counters can be revert back from their high levels on their RESET lines. The IC also offers many features such as high noise immunity and low thermal dissipation. The IC is always available in 16 – pin hermetically sealed package and is directly interfaceable with every TTL, CMOS & NMOS device.

What is An Up Counter?

An up counter is a simple digital logic configuration that can count immediate as well as subsequent events in an increasing order. They are the simplest kind of counter and can start counting from a base value of zero (0). A simple up counter can easily be made by rigging two D – type flip flops.

CD4520 Key Features

High Voltage Types (20V Rating)
CD4518BMS Dual BCD Up Counter
CD4520BMS Dual Binary Up Counter
Medium Speed Operation
- 6MHz Typical Clock Frequency at 10V
Positive or Negative Edge Triggering
Synchronous Internal Carry Propagation
100% Tested for Quiescent Current at 20V
5V, 10V and 15V Parametric Ratings
Maximum Input Current of 1µA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
Noise Margin (Over Full Package/Temperature Range)
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V

CD4520 Pinout

Pin No	Pin Name	Description
1	CLOCK A	Clock Pin of Counter A
2	ENABLE A	Clock Pin of Counter A
3	Q1A	Output Pin 1 of Counter A
4	Q2A	Output Pin 2 of Counter A
5	Q3A	Output Pin 3 of Counter A
6	Q4A	Output Pin 4 of Counter A
7	RESET A	Reset Pin of Counter A
8	VSS	Source Supply
9	ENABLE B	Enable Pin of Counter B
10	CLOCK B	Clock Pin of Counter B
11	Q1B	Output Pin 1 of Counter B
12	Q2B	Output Pin 2 of Counter B
13	Q3B	Output Pin 3 of Counter B
14	Q4B	Output Pin 4 of Counter B
15	RESET B	Reset Pin of Counter B
16	VDD	Drain Supply