4516 BINARY COUNTER INSTRUCTIONS

Table of contents

1. Introduction
2. Schematic
3. How It Works
4. Component List
5. PCB
6. Going Further

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SCHEMATIC

INTRODUCTION

Pre-learning – The Logic Gate Board

Before you learn how the 4516 Binary Counter Board works, you should first learn how the Logic Gate Board works as that kit covers the basics of logic. The Logic Gate Board kit also provides multiple logic chips in the 4000 series, demonstrating how these chips work and how some of the 4000 series share similar packages and configurations.

HOW DOES THE 4516 COUNTER BOARD WORK?

The 4516 Binary Counter kit is a circuit that shows you how the 4516 Binary Up/Down counter works, integrating a counter, debounce circuit, and even a BCD reset (more on this later).

At the heart of this kit is the 4516 4-bit binary counter, which is a part of the 4000 series of logic chips, manufactured by numerous companies (TI, RCA, HGSEMI, etc.), and is extremely popular in discrete logic circuits. Like typical counters, this chip has a 4-bit output representing the current count, a clock input, reset input, and direction input.

However, the 4516 also integrates a 4-bit input and load pin which allows for the counter to be present to a specific value. This can be extremely handy if needing to change the output to some arbitrary number, and can be thought of presetting a countdown kitchen timer.

In addition to the 4516, the kit also integrates the 4585 7-SEG BCD decoder chip, which takes in binary numbers and converts them to a decimal number that can be shown on a 7 segment display. However, because the chip can only drive one display, numbers greater than 9 are shown as a blank screen. This IC will not be looked at in detail in this kit, but will be in future kits.

The clock input to the 4516 is selectable (via SW3) between a push button and a relaxation oscillator, which allows for either manual clocking, or having the 4516 automatically count up and down. With regards to the count direction, a small slide switch (SW6) allows for setting the direction.

To demonstrate counting in binary vs. counting in decimal, an additional switch (SW1) has been provided which allows for resetting the 4516 either by the reset button (SW5) or a secondary glue logic circuit (Q1 and Q2). The glue logic will reset the 4516 when it reaches the value of 10, making the counter count from 0 to 9. However, this only works when incrementing, and will not work when decrementing.

Component List

Component	PCB Reference	Quantity	Looks Like
8 DIP Socket	U2	1
16 DIP Socket	U1, U3	1
LM358 Dual Op-Amp	U2	1
4516 4-Bit Binary Counter	U1	1
4511 7-Segment Decoder	U3	1
100nF Ceramic Disc Capacitor	C1, C3, C4, C5	4
100uF Electrolytic Capacitor	C2	1
100R Resistor	R20, R25	2
470R Resistor	R5, R6, R7, R8, R9, R10, R11	7
1K Resistor	R2, R26 - R34	10
10K Resistor	R1, R3, R4, R12-R19, R21-R24, R35	16
2N3904 NPN Transistor	Q1, Q2, Q3	3
3mm Red LED	D1 - D9	9
7 Segment LED	AFF1	1
Tactile Switch	SW4, SW5, SW7	3
Miniature Slide Switch	SW1, SW3, SW6	3
4 Way DIP Switch	SW2	1
PP3 Battery Connector	BT1	1

PCB

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