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Characteristics | Logic Gates |Counters | Decoders | Display drivers

Also see: 74 Series | ICs

There are many ICs in the 4000 series and this page only covers a selection, concentrating on the most usefulgates, counters, decoders anddisplay drivers.For each IC there is a diagram showing the pin arrangement and brief notes explainthe function of the pins where necessary. The notes also explain if the IC'sproperties differ substantially from the standard characteristics listed below.

If you are using another reference please be aware that there is some variation in the terms used todescribe input pins. I have tried to be logically consistent so the term I have used describes the pin'sfunction when high (true). For example 'disable clock' on the 4026 is often labelled 'clock enable' but this can beconfusing because it enables the clock when low (false). An input described as 'active low' is like this,it performs its function when low. If you see a line drawn above a label it means it is active low, for example: (say 'reset-bar').

General characteristics of 4000 series CMOS ICs

  • Supply: 3 to 15V, small fluctuations are tolerated.
  • Inputs have very high impedance (resistance), this is good because it means they will not affect the part of the circuit where they are connected. However, it also means that unconnected inputs can easily pick up electrical noise and rapidly change between high and low states in an unpredictable way. This is likely to make the IC behave erratically and it will significantly increase the supply current. To prevent problems all unused inputs MUST be connected to the supply (either +Vs or 0V), this applies even if that part of the IC is not being used in the circuit!
  • Outputs can sink and source only about 1mA if you wish to maintain the correct output voltage to drive CMOS inputs. If there is no need to drive any inputs the maximum current is about 5mA with a 6V supply, or 10mA with a 9V supply (just enough to light an LED). To switch larger currents you can connect a transistor.
  • Fan-out: one output can drive up to 50 inputs.
  • Gate propagation time: typically 30ns for a signal to travel through a gate with a 9V supply, it takes a longer time at lower supply voltages.
  • Frequency: up to 1MHz, above that the 74 series is a better choice.
  • Power consumption (of the IC itself) is very low, a few µW. It is much greater at high frequencies, a few mW at 1MHz for example.

The Links page lists Datasheet websites.

Static precautions

The CMOS circuitry means that 4000 series ICs are static sensitive.Touching a pin while charged with static electricity (from your clothes for example) may damage the IC!

In fact most ICs in regular use are quite tolerant and earthing your handsby touching a metal water pipe or window frame before handling them will be adequate.

ICs should be left in their protective packaging until you are ready to use them.

Mixing Logic Families

It is best to build a circuit using just one logic family, but if necessary the different families may bemixed providing the power supply is suitable for all of them. For example mixing 4000 and 74HC requires thepower supply to be in the range 3 to 6V. A circuit which includes 74LSor 74HCT ICs must have a 5V supply.

A 74LS output cannot reliably drive a 4000 or 74HCinput unless a 'pull-up' resistor of2.2k is connected betweenthe +5V supply and the input to correct the slightly different logic voltage ranges used.

Note that a 4000 series output can drive only one 74LS input.

For tables showing characteristics of the logic families see: Logic ICs


Driving 4000 or 74HC inputs from a
74LS output using a pull-up resistor.

Quad 2-input gates

  • 4001 quad 2-input NOR
  • 4011 quad 2-input NAND
  • 4030 quad 2-input EX-OR (now obsolete)
  • 4070 quad 2-input EX-OR
  • 4071 quad 2-input OR
  • 4077 quad 2-input EX-NOR
  • 4081 quad 2-input AND
  • 4093 quad 2-input NAND with Schmitt trigger inputs

The 4093 has Schmitt trigger inputs to provide good noise immunity. They are idealfor slowly changing or noisy signals. The hysteresis is about 0.5V with a 4.5V supply and almost 2V with a 9V supply.

Triple 3-input gates

  • 4023 triple 3-input NAND
  • 4025 triple 3-input NOR
  • 4073 triple 3-input AND
  • 4075 triple 3-input OR

Notice how gate 1 is spread across the two ends of the package.

Dual 4-input gates

  • 4002 dual 4-input NOR
  • 4012 dual 4-input NAND
  • 4072 dual 4-input OR
  • 4082 dual 4-input AND

NC = No Connection (unused pin).

4068 8-input NAND/AND* gate

This gate has a propagation time which is about 10 times longer than normalso it is not suitable for high speed circuits.

NC = No Connection (unused pin).

* = The AND output (pin 1) is not available on some versions of the 4068.

4049 hex NOT and 4050 hex buffer

  • 4049 hex NOT (inverting buffer)
  • 4050 hex non-inverting buffer

Inputs: These ICs are unusual because their gate inputs canwithstand up to +15V even if the power supply is a lower voltage.

Outputs: These ICs are unusual because they are capable of driving 74LS gate inputs directly.To do this they must have a +5V supply (74LS supply voltage). The gate output is sufficient to drive four 74LS inputs.

NC = No Connection (unused pin).

Note the unusual arrangement of the power supply pins for these ICs!

4000 dual 3-input NOR gate and NOT gate

Two 3-input NOR gates and a single NOT gate in one package.

NC = No Connection (unused pin).

Ic Driver Circuit

4017 decade counter (1-of-10)

The count advances as the clock input becomes high (on the rising-edge).Each output Q0-Q9 goes high in turn as counting advances. For some functions(such as flash sequences) outputs may be combined using diodes.

The reset input should be low (0V) for normal operation (counting 0-9).When high it resets the count to zero (Q0 high). This can be done manually witha switch between reset and +Vs and a 10k resistor between reset and 0V.Counting to less than 9 is achieved by connecting the relevant output(Q0-Q9) to reset, for example to count 0,1,2,3 connect Q4 to reset.

The disable input should be low (0V) for normal operation.When high it disables counting so that clock pulses are ignored and the count is kept constant.

The ÷10 output is high for counts 0-4 and low for 5-9, so it providesan output at 1/10 of the clock frequency. It can be used todrive the clock input of another 4017 (to count the tens).

Example projects:
Heart badge |Traffic Light |Dice |Lighthouse

4026 decade counter and 7-segment display driver

The count advances as the clock input becomes high (on the rising-edge).The outputs a-g go high to light the appropriate segments of a common-cathode7-segment display as the count advances. The maximum output current is about 1mA witha 4.5V supply and 4mA with a 9V supply. This is sufficient to directly drive many7-segment LED displays.The table below shows the segment sequence in detail.

The reset input should be low (0V) for normal operation (counting 0-9).When high it resets the count to zero.

The disable clock input should be low (0V) for normal operation.When high it disables counting so that clock pulses are ignored and the countis kept constant.

The enable display input should be high (+Vs) for normal operation.When low it makes outputs a-g low, giving a blank display. The enable outfollows this input but with a brief delay.

The ÷10 output (h in table) is high for counts 0-4 and low for 5-9,so it provides an output at 1/10 of the clock frequency.It can be used to drive the clock input of another 4026 to provide multi-digit counting.

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The not 2 output is high unless the count is 2 when it goes low.

The 'Random' flasher project uses the 4026 in an unconventional way,the outputs a-g and the ÷10 output (h) are used to flash individual LEDs in a complexpattern which appears random if not studied too closely!

4029 up/down synchronous counter with preset

The 4029 is a synchronous counter so its outputs change precisely together on each clock pulse.This is helpful if you need to connect the outputs to logic gates because it avoids the glitches whichoccur with ripple counters.

The count occurs as the clock input becomes high (on the rising-edge).The up/down input determines the direction of counting: high for up, low for down.The state of up/down should be changed when the clock is high.

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For normal operation (counting) preset, and carry in should be low.

The binary/decade input selects the type of counter:4-bit binary (0-15) when high; decade (0-9) when low.

The counter may be preset by placing the desired binary number on the inputs A-D and brieflymaking the preset input high. There is no reset input, but preset can be used to reset the countto zero if inputs A-D are all low.

Connecting in a chain

Please see below for details of connecting synchronous counters like the 4029 in a chain.

4510 up/down decade (0-9) counter with preset
4516 up/down 4-bit (0-15) counter with preset

These are synchronous counters so their outputs change precisely together on each clock pulse.This is helpful if you need to connect their outputs to logic gates because it avoids the glitches which occur with ripple counters.

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The count occurs as the clock input becomes high (on the rising-edge).The up/down input determines the direction of counting: high for up, low for down.The state of up/down should be changed when the clock is high.

For normal operation (counting) preset, reset and carry in should be low.When reset is high it resets the count to zero (0000, QA-QD low).The clock input should be low when resetting.

The counter may be preset by placing the desired binary number on the inputs A-D and brieflymaking the preset input high, the clock input should be low when this happens.

Connecting in a chain

Please see below for details of connecting synchronous counters like the 4510 and 4516 in a chain.

Connecting synchronous counters in a chain

The diagram below shows how to link synchronous counters.Notice how all the clock (CK) inputs are linked.Carry out (CO) feeds carry in (CI) of the next counter.Carry in (CI) of the first counter should be low for 4029, 4510 and 4516 counters.

4518 dual decade (0-9) counter
4520 dual 4-bit (0-15) counter

These contain two separate synchronous counters, one on each side of the IC.

Normally a clock signal is connected to the clock input, with the enable input held high.Counting advances as the clock signal becomes high (on the rising-edge).

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For normal operation the reset input should be low, making it high resets the counter to zero(0000, QA-QD low).

Counting to less than the maximum (9 or 15) can be achieved by connecting the appropriate output(s) to thereset input, using an AND gate if necessary. For example to count 0 to 8 connect QA (1) and QD (8) to reset usingan AND gate.

Special arrangements are used to link 4518/20 counters in a chain, as explained below.

Connecting 4518 and 4520 counters in a chain

The diagram below shows how to link 4518 and 4520 counters. Notice how the normal clock inputs areheld low, with the enable inputs being used instead. With this arrangement counting advances as the enableinput becomes low (on the falling-edge) allowing output QD to supply a clock signal to the next counter.The complete chain is a ripple counter, although the individual counters are synchronous!If it is essential to have truly synchronous counting a system of logic gates is required, pleasesee a 4518/20 datasheet for further details.

4020 14-bit (÷16,384) ripple counter

The 4020 is a ripple counter so beware that glitches may occur in any logic gatesystems connected to its outputs due to the slight delay before the later counter outputs respond to a clock pulse.

The count advances as the clock input becomes low (on the falling-edge), this is indicatedby the bar over the clock label. This is the usual clock behaviour of ripple counters and it meansa counter output can directly drive the clock input of the next counter in a chain.

Output Qn is the nth stage of the counter, representing 2n,for example Q4 is 24 = 16 (1/16 of clockfrequency) and Q14 is 214 = 16384 (1/16384of clock frequency). Note that Q2 and Q3 are not available.

The reset input should be low for normal operation (counting).When high it resets the count to zero (all outputs low).

Also see: 4040 (12-bit) and 4060 (14-bit with internal oscillator).

4024 7-bit (÷128) ripple counter

The 4024 is a ripple counter so beware that glitches may occur in any logicgate systems connected to its outputs due to the slight delay before the later counter outputs respond to a clock pulse.

The count advances as the clock input becomes low (on the falling-edge), this is indicatedby the bar over the clock label. This is the usual clock behaviour of ripple counters and it meansa counter output can directly drive the clock input of the next counter in a chain.

Output Qn is the nth stage of the counter, representing 2n,for example Q4 is 24 = 16 (1/16 of clockfrequency) and Q7 is 27 = 128 (1/128 of clock frequency).

The reset input should be low for normal operation (counting).When high it resets the count to zero (all outputs low).

4040 12-bit (÷4096) ripple counter

The 4040 is a ripple counter so beware that glitches may occur in any logicgate systems connected to its outputs due to the slight delay before the later counter outputs respond to a clock pulse.

The count advances as the clock input becomes low (on the falling-edge), this is indicatedby the bar over the clock label. This is the usual clock behaviour of ripple counters and it meansa counter output can directly drive the clock input of the next counter in a chain.

Output Qn is the nth stage of the counter, representing 2n,for example Q4 is 24 = 16 (1/16 of clockfrequency) and Q12 is 212 = 4096 (1/4096 of clock frequency).

The reset input should be low for normal operation (counting).When high it resets the count to zero (all outputs low).

Also see these 14-bit counters: 4020 and 4060 (includes internal oscillator).

4060 14-bit (÷16,384) ripple counter with internal oscillator

The 4060 is a ripple counter so beware that glitches may occur in any logicgate systems connected to its outputs due to the slight delay before the later counter outputs respond to a clock pulse.

The count advances as the clock input becomes low (on the falling-edge), this is indicatedby the bar over the clock label. This is the usual clock behaviour of ripple counters and it meansa counter output can directly drive the clock input of the next counter in a chain.The clock can be driven directly, or connected to the internal oscillator (see below).

Output Qn is the nth stage of the counter, representing 2n,for example Q4 is 24 = 16 (1/16 of clockfrequency) and Q14 is 214 = 16384 (1/16384of clock frequency). Note that Q1-3 and Q11 are not available.

The reset input should be low for normal operation (counting).When high it resets the count to zero (all outputs low).

Example projects:
Christmas Decoration |Valentine Heart

The 4060 includes an internal oscillator.The clock signal may be supplied in three ways:

  • From an external source to the clock input, as for a normal counter.In this case there should be no connections to external C and external R (pins 9 and 10).
  • RC oscillator as shown in the diagram. The oscillator drives the clock input with an approximatefrequency f = 1/(2×R1×C) (it partly depends on the supply voltage).R1 should be at least 50kif the supply voltage is less than 7V. R2 should be between 2 and 10 times R1.
  • Crystal oscillator as shown in the diagram, note that there is no connection to pin 9.The 32768 Hz crystal will give a 2Hz signal at the last output, Q14.

Also see: 4020 (14-bit) and 4040 (12-bit),neither of these have internal oscillators.

4028 BCD to decimal (1 of 10) decoder

The appropriate output Q0-9 becomes high in response to the BCD(binary coded decimal) input. For example an input of binary 0101 (=5) will make output Q5 high and all other outputs low.

The 4028 is a BCD (binary coded decimal) decoder intended for input values 0 to 9 (0000 to 1001in binary). With inputs from 10 to 15 (1010 to 1111 in binary) all outputs are low.

Note that the 4028 can be used as a 1-of-8 decoder if input D is held low.

Also see: 4017 (a decade counter and 1-of-10 decoder in a single IC).

4511 BCD to 7-segment display driver

The appropriate outputs a-g become high to display the BCD(binary coded decimal) number supplied on inputs A-D.The outputs a-g can source up to 25mA.The 7-segment display segments must be connected between the outputs and 0V with a resistor in series(330 with a 5V supply).A common cathode display is required.

Display test and blank input are active-low so they should be high for normal operation.When display test is low all the display segments should light (showing number 8).When blank input is low the display is blank (all segments off).

The store input should be low for normal operation. When store is high the displayednumber is stored internally to give a constant display regardless of any changes which may occurto the inputs A-D.

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The 4511 is intended for BCD (binary coded decimal).Inputs values from 10 to 15 (1010 to 1111 in binary) will give a blank display (all segments off).

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