CY54FCT138TDMB

Overview

The CY54FCT138TDMB 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 two active-low enables (E1, E2) and one active-high enable (E3). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to 125°C. Key electrical characteristics include a 32-mA output sink current and a 12-mA output source current.

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 with 2000-V human-body model, 200-V machine model, and 1000-V charged-device model ratings.

Applications

• Partial-power-down applications requiring output disabling.
• 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 'DMB' corresponds to the CDIP package and military grade specifications. Confirm the manufacturer is Texas Instruments or its authorized licensee. Ensure the component meets MIL-PRF-38535 requirements if applicable. Check for RoHS exemption status as indicated in the packaging data. Validate the part marking against official documentation.

Selection Notes

Select this component for designs requiring high noise immunity and robust ESD protection. The dual enable inputs facilitate easy parallel expansion. Verify compatibility with TTL input and output logic levels. Consider the thermal impedance and power dissipation limits for the chosen package. Ensure the operating temperature range aligns with the application environment.

Part Context

This device belongs to the FCT logic family, offering reduced VOH versions and matched rise/fall times. It is functionally compatible with FCT and F Logic families. The CY54FCT138T variant specifically denotes the military-grade version with lower drive currents compared to the commercial CY74FCT138T counterpart.

Replacement Considerations

CY54FCT138TLMB