74AC161MTC

Overview

The onsemi 74AC161MTC is a high-speed synchronous modulo-16 binary counter housed in a 16-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature range of -40°C to +85°C. The device features four fundamental modes: asynchronous reset, parallel load, count-up, and hold. It includes two Count Enable inputs and a Terminal Count output for multistage expansion. Outputs can source or sink 24 mA, with a typical count rate of 125 MHz.

Feature Summary

• Synchronous counting and loading capabilities ensure accurate state transitions aligned with clock edges.
• High-speed synchronous expansion functionality allows versatile configuration of multistage counters using Terminal Count outputs.
• Strong drive capability enables direct interfacing with loads through 24 mA source/sink output currents.

Applications

• Programmable frequency dividers
• Synchronous multistage counter systems
• Digital timing circuits requiring precise modulo-16 sequences

Procurement Notes

Verify the specific ordering code suffix against manufacturer documentation to confirm package type and tape/reel availability. Ensure that the selected variant matches the required logic family specifications and environmental compliance standards before finalizing procurement orders.

Selection Notes

Select this component when a synchronous modulo-16 binary counter with parallel preset capability is required. Consider the TSSOP package for surface-mount applications. Verify that the AC logic family voltage ranges and speed characteristics align with the system's power and timing constraints.

Part Context

This part belongs to the 74AC161 series of synchronous presettable binary counters. It shares functional similarities with the 74ACT161 but differs in input threshold compatibility. The MTC suffix specifically denotes the 16-lead TSSOP physical package format.

Replacement Considerations

Public confirmed substitute part numbers include MC74AC161DG and CD74AC161E.

FAQ

How does the Master Reset function operate?

The Asynchronous Master Reset input overrides all other inputs and forces all outputs LOW immediately, independent of the clock signal.

What determines the mode of operation?

The mode is determined by the states of the Master Reset, Parallel Enable, Count Enable Parallel, and Count Enable Trickle inputs relative to the rising clock edge.