SN74LV8154NE4

Counter Dividers Overview

The SN74LV8154NE4 is a dual 16-bit binary counter with 3-state output registers manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 5.5 V and supports up-counting modes on dedicated clock inputs. The device features an asynchronous clear input and a shared storage register that samples counter contents. It utilizes four bus reads to access the full 32-bit stored count via an 8-bit output bus. The component is housed in a 20-pin PDIP package, supports through-hole installation, and functions reliably across temperatures from -40 °C to 85 °C.

Counter Dividers Feature Summary

• Supports configuration as two independent 16-bit counters or a single chained 32-bit counter
• Includes Ioff circuitry for partial-power-down mode operation to prevent backflow current
• Features a shared clocked storage register to sample and save counter contents asynchronously
• Provides high electrostatic discharge protection exceeding standard human body and machine model ratings

Counter Dividers Applications

• Up counters
• Dual up counters
• Systems requiring partial-power-down capabilities

Counter Dividers Procurement Notes

Verify the specific ordering suffix 'E4' corresponds to the required environmental compliance status before procurement. Confirm the package type matches the intended PCB footprint, as this part number specifically denotes the PDIP variant. Ensure the design accounts for the active-low control signals and positive-edge triggered clocks specified in the datasheet timing requirements.

Counter Dividers Selection Notes

Select this component when a design requires counting two separate events simultaneously or chaining them for extended range. It is suitable for applications needing sampled data retention via a storage register rather than direct continuous output. Consider the 2-V to 5.5-V operating range to ensure compatibility with the system's power supply rails and logic levels.

Counter Dividers Part Context

This device belongs to the SN74LV series of low-voltage CMOS logic components produced by Texas Instruments. The SN74LV8154 family provides dual 16-bit binary counting functionality with 3-state outputs. The NE4 suffix indicates the PDIP package version with specific manufacturing attributes defined by the supplier.

Counter Dividers Replacement Considerations

SN74LV8154N

Counter Dividers FAQ

How are the two 16-bit counters connected to form a single 32-bit counter?

Connect the CLKBEN pin to the RCOA pin. This chains the counters so that Counter B increments only when Counter A reaches its maximum count.

What is the function of the GAL, GAU, GBL, and GBU inputs?

These inputs select which byte of the 32-bit storage register is mapped to the Y0-Y7 output bus. GAL selects the lower byte of Counter A, GAU selects the upper byte of Counter A, GBL selects the lower byte of Counter B, and GBU selects the upper byte of Counter B.

How does the Ioff feature benefit the device operation?

The Ioff circuitry disables the outputs when the device is powered down, preventing damaging current backflow through the device into the power supply lines.