CD74HC161E

Timing:	Synchronous
Base Part Number:	74HC161
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 125°C
Voltage - Supply:	2V ~ 6V
Trigger Type:	Negative Edge
Count Rate:	24MHz
Series:	74HC
Reset:	Asynchronous
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up
Logic Type:	Binary Counter
Part Status:	Active
Packaging:	Tube

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Introduction

The CD74HC161E is a synchronous presettable 4-bit binary counter featuring an asynchronous parallel load and reset, and full logic level compatibility with all TTL logic families. This device features synchronous loading of a new data word into the count register from the parallel inputs upon the LOW-to-HIGH transition of the parallel load input (PL). The preset inputs (P0 to P3) are logically ORed with the D inputs to preset the counter register during a PL LOW-to-HIGH transition. During power up or power down, the device is in the reset state.The CD74HC161E is ideal for divide-by-N applications since the modulus of the counter is programmable and only one counter is needed to implement an N-bit counter. It can also be used as a single 4-bit counter, or multiple counters connected in cascading configurations to create higher bit counter systems. This device is suitable for generic counter or divider applications, frequency division, pulse generation, automation control and sequence verification.

Application Field

The CD74HC161E is a member of the High-Speed CMOS Logic family, and can be used for a variety of applications ranging from generic counter or divider applications, frequency division, pulse generation, automation control and sequence verification.For example, the counter can be used in data acquisition systems, as a modulo-N counter, shift registers, and encoding & decoding control applications. It is also suitable for use in robotic control systems, process automation and machine control, and any other system where a reliable and precise timing signal is needed.

Working Principle

The CD74HC161E is a 4-bit binary synchronous presettable counter which counts on the LOW-to-HIGH transition of its clock input (CP). It consists of two integrated circuits: a 4-bit latch and a 4-bit counter. The counter includes an up/down control input which allows selection of up or down counting.The counter is preloaded with a count value via the D inputs when the parallel load input (PL) is brought LOW-to-HIGH. The data stored in the latch drives the count register during up or down counting. The counter can also be preset by applying logic combinations to the P0 to P3 inputs.The output from the count register are levels compatible with TTL logic families, so the output logic levels can be used in many types of systems. The output signals can also be used for divide-by-N applications and to generate pulse trains for other applications.

Conclusion

The CD74HC161E is a versatile synchronous 4-bit binary counter which can be used for a variety of applications ranging from generic counter or divider applications, frequency division, pulse generation, automation control and sequence verification. It has fast counting speed, logic level compatibility and is suitable for single or cascading counter applications. It is an ideal choice for data acquisition systems, robotic control systems, process automation as well as machine control.

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