CY54FCT138TLMB

Overview

The CY54FCT138TLMB is a military-grade 1-of-8 decoder manufactured by Texas Instruments. It accepts three binary weighted inputs (A0, A1, A2) and provides eight mutually exclusive active-low outputs when enabled. The device features three enable inputs: two active low (E1, E2) and one active high (E3). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature range from -55°C to 125°C. The package is LCCC with 20 pins.

Feature Summary

• Features edge-rate control circuitry for significantly improved noise characteristics
• Includes Ioff circuitry that disables outputs to prevent damaging current backflow during partial-power-down mode
• Provides ESD protection exceeding JESD 22 standards for human-body, machine model, and charged-device model scenarios

Applications

• Partial-power-down applications requiring output disablement
• Parallel expansion of decoders to form larger decoding structures
• Military and aerospace electronic systems requiring extended temperature operation

Procurement Notes

Verify the specific ordering suffix 'LMB' corresponds to the LCCC ceramic package and MIL-PRF-38535 compliance if required. Confirm the part status as active production. Ensure the procurement documentation matches the exact part number CY54FCT138TLMB to distinguish it from commercial variants like the CY74FCT138T series. Check for RoHS exemption status associated with this military grade component.

Selection Notes

Select the CY54FCT138TLMB when military-grade reliability and extended temperature ranges are mandatory. This variant offers higher drive strength compared to some commercial equivalents but requires careful attention to its specific power supply limits. Consider the LCCC package constraints for PCB layout and thermal management in harsh environments.

Part Context

This component belongs to the FCT logic family, which combines fast CMOS technology with TTL compatibility. Texas Instruments acquired the FCT line from Cypress Semiconductor. The CY54 prefix indicates a military-grade specification, distinguishing it from the commercial CY74 series. These devices are designed for high-speed digital applications requiring robust performance across wide environmental conditions.

Replacement Considerations

CY54FCT138CTLMB