74HC243D,112

Overview

The 74HC243D,112 is a high-speed Si-gate CMOS quad bus transceiver with non-inverting 3-state outputs. It supports bidirectional asynchronous data communication between two buses using separate output enable inputs (OEA and OEB) for isolation. The device operates within a supply voltage range of 2.0 V to 6.0 V and complies with JEDEC standard no. 7A. It features low-power dissipation and robust ESD protection exceeding 2000 V HBM and 200 V MM. The component is specified for ambient temperatures from -40 °C to +125 °C.

Feature Summary

• Non-inverting 3-state outputs for bus driver applications
• Bidirectional asynchronous data bus communication capability
• Independent output enable inputs for bus isolation

Applications

• Asynchronous 2-way data communications between data buses
• Bus driver implementations requiring isolation
• Pin-compatible replacements for Low-power Schottky TTL (LSTTL)

Procurement Notes

Verify the specific ordering suffix '112' against the manufacturer's current documentation to confirm package type and tape-and-reel specifications. Ensure the requested part matches the SO14 plastic small outline package variant described in the datasheet. Confirm compliance with the latest product status and revision history before finalizing procurement orders.

Selection Notes

Select this component when non-inverting logic is required for bidirectional bus interfacing. The 74HC243 differs from the 74HC242 by providing true (non-inverting) outputs rather than inverted ones. Consider the operating temperature range and supply voltage requirements to ensure compatibility with the target system environment and load conditions.

Part Context

This device belongs to the NXP 74HC series of high-speed CMOS logic components. It is pin-compatible with Low-power Schottky TTL (LSTTL), facilitating direct upgrades or replacements in legacy designs. The 74HC243 serves as the non-inverting counterpart to the 74HC242 inverter family.

Replacement Considerations

The 74HC242 is a functional substitute but provides inverted outputs instead of non-inverting ones. Verify logic polarity requirements when substituting. Other quad bus transceivers may require level shifting or different control logic due to varying enable pin configurations.