CD4073 DATASHEET PDF

PDF CD internal gates. The difference depends on your system definition. On the one hand, 74HC operates over a limited voltage range, with 6 volts specified as the maximum supply voltage. The CD series, on the other hand, is rated to a maximum of 18 volts, so it may well be easier to use the CD series in a battery-operated system.

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PDF CD internal gates. The difference depends on your system definition. On the one hand, 74HC operates over a limited voltage range, with 6 volts specified as the maximum supply voltage. The CD series, on the other hand, is rated to a maximum of 18 volts, so it may well be easier to use the CD series in a battery-operated system.

If the limited voltage range of the 74HC line is not a problem, the line is much faster. For the CD vs the 74HC85 4-bit magnitude comparator the numbers are nsec typ vs. It's worth keeping in mind that both lines run faster at higher Vdd, so a CD at 15 volts will do better than the numbers here, but the order of magnitude difference is not erased.

Note that 74HC inputs cannot be reliably driven by 74LS outputs because the voltage ranges used for logic 0 are not quite compatible, use 74HCT instead. The minor disadvantage of 74HCT is a lower immunity to noise, but this is unlikely to be a problem in most situations.

For most new projects the 74HC family is the best choice. Some 74 series ICs have open collector outputs, this means they can sink current but they cannot source current. The diagram shows how an open collector output can be connected to sink current from a supply which has a higher voltage than the logic IC supply.

The maximum load supply is 15V for most open collector ICs. They are ideal for slowly changing or noisy signals. These are ripple counters so beware that glitches may occur in any logic gate systems connected to their 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 indicated by the bar over the clock label.

This is the usual clock behaviour of ripple counters and it means a counter output can directly drive the clock input of the next counter in a chain. For normal use connect QA to clockB to link the two sections, and connect the external clock signal to clockA. For normal operation at least one reset0 input should be low, making both high resets the counter to zero , QA-QD low.

Note that the has a pair of reset9 inputs on pins 6 and 7, these reset the counter to nine so at least one of them must be low for counting to occur. Counting to less than the maximum 9 or 15 can be achieved by connecting the appropriate output s to the two reset0 inputs. If only one reset input is required the two inputs can be connected together. For example: to count 0 to 8 connect QA 1 and QD 8 to the reset inputs. For normal use connect QA to clockB and connect external clock signal to clockA.

Connecting in a chain Please see below for details of connecting ripple counters like the and in a chain. The contains two separate decade 0 to 9 counters, one on each side of the IC. They are ripple counters so beware that glitches may occur in any logic gate systems connected to their outputs due to the slight delay before the later counter outputs respond to a clock pulse. For normal operation the reset input should be low, making it high resets the counter to zero , QA-QD low. Counting to less than 9 can be achieved by connecting the appropriate output s to the reset input, using an AND gate if necessary.

Connecting in a chain Please see below for details of connecting ripple counters like the in a chain. The contains two separate 4-bit 0 to 15 counters, one on each side of the IC. They are ripple counters so beware that glitches may occur in logic systems connected to their outputs due to the slight delay before the later outputs respond to a clock pulse. This is the usual clock behaviour of ripple counters and it means means a counter output can directly drive the clock input of the next counter in a chain.

Counting to less than 15 can be achieved by connecting the appropriate output s to the reset input, using an AND gate if necessary. This is helpful if you need to connect their outputs to logic gates because it avoids the glitches which occur with ripple counters. The count advances as the clock input becomes high on the rising-edge.

The decade counters count from 0 to 9 to in binary. The 4-bit counters count from 0 to 15 to in binary. When low it resets the count to zero , QA-QD low , this happens immediately with the and standard reset , but with the and synchronous reset the reset occurs on the rising-edge of the clock input. Counting to less than the maximum 15 or 9 can be achieved by connecting the appropriate output s through a NOT or NAND gate to the reset input.

For the and synchronous reset you must use the output s representing one less than the reset count you require, e. These are synchronous counters so their outputs change precisely together on each clock pulse. These counters have separate clock inputs for counting up and down.

The count increases as the up clock input becomes high on the rising-edge. The count decreases as the down clock input becomes high on the rising-edge. In both cases the other clock input should be high. For normal operation counting the preset input should be high and the reset input low.

When the reset input is high it resets the count to zero , QA-QD low. Note that a clock pulse is not required to preset, unlike the counters.

The outputs are active-low which means they become low when selected but are high at other times. They can sink up to about 20mA. The appropriate output becomes low in response to the BCD binary coded decimal input. The is a BCD binary coded decimal decoder intended for input values 0 to 9 to in binary. With inputs from 10 to 15 to in binary all outputs are high. Note that the can be used as a 1-of-8 decoder if input D is held low. Also see: 74HC and both are a decade counter and 1-of decoder in a single IC.

A common anode 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.

If the blank input is low the display will be blank when the count input is zero This can be used to blank leading zeros when there are several display digits driven by a chain of counters. The is intended for BCD binary coded decimal which is input values 0 to 9 to in binary.

Inputs from 10 to 15 to in binary will light odd display segments but will do no harm. Equivalent circuit of the CMOS digital inverter with a logic-0 and b logic-1 inputs. Basic A-series inverter stage, with internal input and output protection networks. Typical drain-current transfer characteristics of the simple CMOS inverter. Typical voltage transfer characteristics of the simple CMOS inverter.

Voltage transfer graph of the Figure 7 B-series inverter. Basic B-series inverter with typical input and output protection networks. Typical propagation delays of B-series inverters when driving a 50 pF load. Basic CMOS inverter with open-drain output.

Basic circuit of a three-state CMOS non-inverting buffer. Equivalent of a three-state buffer circuit in its third high-impedance state. Basic CMOS bilateral switch or transmission gate. Alternative ways of connecting unwanted CMOS inputs see text. All used CMOS inputs must be tied to definite logic levels see text. Typical B-series short-circuit output currents at 25 OC. Typical 74HC series short-circuit output currents at 25 OC. The previous Supplemental Chapter dealt with static parameters "DC characteristics" of voltage and current for digital chips.

This chapter on dynamic parameters extends our look at data sheets to what are called "AC characteristics"-various propagation delays and timing requirements. We also look at the relationship between power consumption and switching speed. In the process it is necessary to compare various semiconductor versions of logic gates. The marketplace has provided an environment for a struggle between different versions of logic chips. Over the years some logic families have survived the struggle and thrived, while others have become virtually extinct.

In this chapter we examine the surviving families, and study their evolution. We see what virtues the survivors possess-chief among these are fast switching speed, low power consumption, high packing density and reasonable cost per gate. To proceed, you may want to review facts of electric circuits with energy-storing capacitors-including what an RC time constant is.

After a central processing unit CPU upgrade in the RT could load the same benchmark program in 30 seconds. Why the reduction in loading time? The hard disk hadn't been changed, so the reduction must have come from improvements in the CPU.

While there may have been some advances in the CPU's "architecture"-notably more parallel processing and better direct memory access DMA -a major improvement was in the shorter propagation delays of individual gates and chips. Faster hardware is better, all other things being equal. We'll see in this chpt. Our first goal in this chapter will be to understand timing parameters in data sheets of chips.

We want not so much to delve into the chip fabrication technology which brings about greater speed as to appreciate the limitations which timing parameters place on circuit design. When an output switches from one state to the other, propagation delay t-p is counted as the time from "instantaneous" input change to time of output reaching a new logic level, either VOL or VOH, as illustrated below. Propagation delay of a gate is not the same thing as rise or fall time for an individual transistor.

To propagate through an IC a signal may have to pass through several transistors and may pass through different transistor paths depending on the kind of input data, select, enable, etc being asserted. An npn bipolar transistor can turn on faster than it can turn off, which results in series chips having different propagation delays for LO-to-HI and HI-to-LO output transitions.

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