74HC244BQ,115

Overview

The Nexperia 74HC244BQ,115 is an octal buffer and line driver featuring three-state outputs. It operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device is housed in a DHVQFN20 package (SOT764-1) with dimensions of 2.5 mm by 4.5 mm. It provides two independent output enable inputs, allowing configuration as either one 8-bit buffer or two 4-bit buffers.

Feature Summary

• Features non-inverting three-state outputs controlled by dedicated active-low enable signals for each half of the bus.
• Includes input clamp diodes that facilitate interfacing with voltages exceeding the supply rail when current-limiting resistors are used.
• Complies with JEDEC JESD7A standards for operation across a wide 2.0 V to 6.0 V supply voltage range.

Applications

• Octal bus interface applications
• Memory and memory mapping
• Clock drivers

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature range. Confirm RoHS compliance status and moisture sensitivity level requirements against the project specifications before finalizing procurement orders.

Selection Notes

Select this component for designs requiring high noise immunity and low power dissipation. Ensure the logic family aligns with system voltage levels, as HC inputs require CMOS levels distinct from TTL requirements found in HCT variants.

Part Context

This part belongs to the 74HC/HCT244 family of octal buffers. It shares functional similarities with other 74-series logic devices but is distinguished by its specific DHVQFN packaging and defined operating conditions for industrial temperature ranges.

Replacement Considerations

Cross-reference with 74HCT244BQ,115 if TTL-compatible inputs are required instead of CMOS levels. Verify pinout compatibility with alternative manufacturers' equivalents before implementation.

FAQ

How does the device handle overvoltage on inputs?

Inputs include clamp diodes that allow the use of current limiting resistors to interface inputs to voltages in excess of VCC.

What is the function of the nOE pins?

The 1OE and 2OE pins are active-low output enables. A HIGH state on these pins causes the corresponding outputs to assume a high-impedance OFF-state.