74HC243D,118

Overview

The 74HC243D,118 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 and allows isolation via output enable inputs OEA and OEB. The device complies with JEDEC standard no. 7A and features ESD protection exceeding 2000 V (HBM) and 200 V (MM). It operates within a supply voltage range of 2.0 V to 6.0 V and functions across temperature ranges from -40 °C to +85 °C and -40 °C to +125 °C.

Feature Summary

• Non-inverting 3-state outputs for bidirectional data transfer
• Asynchronous 2-way data bus communication capability
• ESD protection compliant with JESD22-A114-B and A115-A standards

Applications

• Isolating data buses in digital systems
• Bidirectional data transmission between microprocessors and peripherals
• Bus driver applications requiring 3-state control

Procurement Notes

Verify the specific package variant against the ordering information table, as the 'D' suffix denotes the SO14 plastic small outline package. Confirm that the required operating temperature range aligns with the specified limits for the selected package version. Ensure compatibility with the target system's voltage levels and signal integrity requirements before finalizing procurement.

Selection Notes

Select this component when non-inverting logic is required for bus transceivers. Compare against the 74HC242 if inverting outputs are acceptable, as they share similar functionality. Consider the available package options including DIP14 and SSOP14 if space constraints differ from the SO14 form factor. Verify power dissipation calculations based on load capacitance and switching frequency.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It is pin-compatible with low-power Schottky TTL (LSTTL), facilitating upgrades or replacements in legacy designs. The manufacturer offers multiple package variations for this functional block, allowing flexibility in PCB layout and thermal management strategies.

Replacement Considerations

Check for equivalent parts from other manufacturers that meet the same JEDEC specifications. Verify pinout compatibility to ensure direct replacement without circuit modification.