M38510/38001B2A

Counter Dividers Overview

The M38510/38001B2A is a military-grade synchronous 4-bit binary counter manufactured by Texas Instruments. It belongs to the ALS logic family and features internal look-ahead circuitry for high-speed counting applications. The device supports synchronous presetting, asynchronous clear, and n-bit cascading via a ripple-carry output. It operates over the full military temperature range of -55 °C to 125 °C and is available in a 20-pin Ceramic Leadless Chip Carrier (FK) package.

Counter Dividers Feature Summary

• Synchronous operation with simultaneous flip-flop clocking eliminates output counting spikes.
• Internal carry look-ahead circuitry enables high-speed n-bit cascading without additional gating.
• Fully programmable design allows presetting to any value between 0 and 15 on the next clock pulse.
• Asynchronous clear function sets all outputs low regardless of clock or enable input levels.

Counter Dividers Applications

• High-speed digital counting designs
• n-bit synchronous counter cascading
• Military and defense electronic systems

Counter Dividers Procurement Notes

Verify that the component meets MIL-PRF-38535 Class B specifications. Confirm the presence of the correct military marking code JM38510/38001B2A on the ceramic package. Ensure the supplier provides traceability documentation required for defense procurement standards.

Counter Dividers Selection Notes

Select this part when a 4-bit binary counter with synchronous control and asynchronous reset is required. The ALS technology offers a balance of speed and power consumption suitable for complex military logic circuits. Verify compatibility with existing 5V logic families and ensure the FK package fits the target footprint.

Counter Dividers Part Context

This component is part of the SN54ALS161B family, specifically qualified under the JM38510 military standard. It serves as a robust alternative to commercial variants, providing extended temperature tolerance and reliability for harsh environments while maintaining identical logical functionality to the SN54ALS161B.

Counter Dividers Replacement Considerations

Direct replacements include SN54ALS161BFK and SNJ54ALS161BFK. Verify pinout compatibility and electrical characteristics before substitution.

Counter Dividers FAQ

Is the clear function synchronous or asynchronous?

The clear function for the M38510/38001B2A is asynchronous, setting all outputs low immediately regardless of clock or enable inputs.

How does the device handle cascading?

It utilizes internal carry look-ahead circuitry and an RCO output to facilitate high-speed n-bit cascading without requiring external gating logic.