74HCT540DB,112

Overview

The Nexperia 74HCT540DB,112 is an octal buffer and line driver featuring inverting outputs with three-state capability. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL-level input signals. The device includes two active-LOW output enable inputs (OE1 and OE2) that control the high-impedance OFF-state. It utilizes SSOP20 packaging (SOT339-1) and supports an ambient operating temperature from -40 °C to +125 °C.

Feature Summary

• Provides eight inverting buffer channels with independent three-state control via dual enable inputs.
• Accepts TTL logic levels for reliable interfacing with standard digital systems.
• Includes input clamp diodes to facilitate safe interface with voltages exceeding the supply rail.

Applications

• Carry-out generation in adder circuits
• Clock drivers
• Bus-oriented transmissions

Procurement Notes

Verify the specific ordering suffix '112' corresponds to the SSOP20 package variant. Confirm the manufacturer's current production status and availability through official Nexperia channels or authorized distributors before finalizing procurement plans.

Selection Notes

Select this component when an octal inverting buffer with three-state outputs is required. Ensure the system operates within the 4.5 V to 5.5 V supply range and requires TTL-compatible input thresholds. Verify that the SSOP20 package dimensions fit the target PCB layout constraints.

Part Context

This part belongs to the 74HCT series of CMOS logic devices, designed for compatibility with TTL logic families. It serves as a fundamental building block for digital signal routing and buffering applications requiring high noise immunity and low power dissipation.

Replacement Considerations

Check for direct pin-to-pin replacements such as the 74HC540 variants if CMOS input levels are acceptable. Verify functional equivalence regarding propagation delay and output drive strength against alternative octal buffer ICs.

FAQ

How does the 74HCT540 handle input voltages higher than VCC?

The device features input clamp diodes that allow the use of current-limiting resistors to safely interface inputs to voltages exceeding the supply voltage.

What is the function of the OE1 and OE2 pins?

OE1 and OE2 are active-LOW output enable inputs. A HIGH level on either pin forces all outputs into a high-impedance OFF-state.