74HCT244N,652

Overview

The NXP USA Inc. 74HCT244N,652 is an octal buffer and line driver featuring three-state outputs, manufactured using CMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports ambient temperatures from -40 °C to +125 °C. The device provides two independent output enable inputs (1OE and 2OE), each controlling four non-inverting outputs. Propagation delay is specified at a maximum of 33 ns at 4.5 V with a 50 pF load. Input levels are compatible with TTL standards.

Feature Summary

• Features two independent output enable inputs for separate control of eight non-inverting outputs
• Provides high noise immunity and low power dissipation through CMOS construction
• Includes input clamp diodes to facilitate interfacing with voltages exceeding the supply rail

Applications

• Octal bus interface applications
• Driving bus lines and memory address registers
• Clock drivers and buffered oscillators

Procurement Notes

Verify that the component matches the specific HCT logic family requirements rather than HC variants. Confirm the package designation corresponds to the standard plastic small outline variant. Ensure the ordering suffix aligns with the required temperature range and packaging specifications before finalizing procurement.

Selection Notes

Select this component when TTL-compatible input thresholds are necessary alongside CMOS drive capabilities. The dual enable structure allows flexible configuration as either one 8-bit buffer or two 4-bit buffers. Verify that the operating voltage remains strictly within the 4.5 V to 5.5 V recommended limits to maintain signal integrity.

Part Context

This part belongs to the Nexperia 74HCT244 series of octal buffers and line drivers. It is designed for high-performance computing systems requiring wide supply voltage tolerance. The device replaces older bipolar equivalents while offering superior switching speeds and lower power consumption compared to standard 74HC series components.

Replacement Considerations

Direct functional substitutes include the 74HC244N,652, though it requires different input voltage levels. Other compatible options within the same family include the 74HCT244D and 74HCT244PW, which share identical electrical characteristics but utilize different package types.