SN74LV138ABQBR

Overview

The SN74LV138ABQBR is a 3-line to 8-line decoder/demultiplexer from the LV logic series, designed for VCC operation between 2 V and 5.5 V. It features three binary-select inputs (A0, A1, A2) and three enable inputs (G0, G1, G2), where G0 and G1 are active-low and G2 is active-high. The device provides eight active-low outputs (Y0–Y7). It supports mixed-mode voltage operation on all ports and includes Ioff circuitry for partial-power-down mode. The component operates within an ambient temperature range of -40°C to 85°C.

Feature Summary

• Supports mixed-mode voltage operation across all input and output ports
• Includes Ioff circuitry to disable outputs during partial-power-down states
• Features balanced CMOS push-pull outputs with standard CMOS inputs

Applications

• Output expansion in digital systems
• LED matrix control applications
• 7-segment display control circuits
• 8-bit data storage implementations

Procurement Notes

Verify that the specific BQB package variant matches the required footprint dimensions of 3.60 mm by 2.60 mm. Confirm the operating temperature range aligns with the -40°C to 85°C specification for the target environment. Ensure supply voltage constraints remain within the 2 V to 5.5 V limits defined in the datasheet.

Selection Notes

Select this component when low drive current and slow edge rates are required to minimize output ringing and overshoot. The device is suitable for high-performance memory decoding where short propagation delays are critical. Consider the specific enable input configuration if external inverters must be avoided during system expansion.

Part Context

This part belongs to the SN74LV138A family of decoders and demultiplexers manufactured by Texas Instruments. It utilizes the LV logic series technology, optimized for 2 V to 5.5 V operation. The BQB suffix indicates a WQFN-16 package configuration, distinguishing it from other package options like SOIC or TSSOP available within the same logical family.

Replacement Considerations

SN74LV138ADBR

FAQ

How does the device handle partial-power-down conditions?

The SN74LV138ABQBR includes Ioff circuitry that disables all outputs when the supply pin is held at 0 V, preventing damaging current backflow regardless of applied input voltages.

What is the function of the enable inputs G0, G1, and G2?

The device uses two active-low enable inputs (G0, G1) and one active-high enable input (G2) to select one of the eight output lines based on the binary-select inputs.