74HC244D,653

The 74HC244D,653 from NXP Semiconductors is an 8-bit buffer/line driver featuring 3-state outputs. This device is designed for versatile use, capable of functioning as two 4-bit buffers or a single 8-bit buffer. It offers two output enable controls, each managing four outputs. A high signal on the output enable pin forces the outputs into a high-impedance OFF-state.

Key electrical characteristics include a wide supply voltage range from 2.0 V to 6.0 V and CMOS low power dissipation. The device exhibits high noise immunity and meets latch-up performance exceeding 100 mA per JESD 78 Class II Level B. Input levels are CMOS for the 74HC244 variant and TTL for the 74HCT244 variant. It complies with JEDEC standards JESD8C (2.7 V to 3.6 V) and JESD7A (2.0 V to 6.0 V).

This buffer/line driver is specified for operation across a temperature range of -40 °C to +125 °C. It is available in a 20-SOIC package with a body width of 7.5 mm, suitable for surface mounting. ESD protection is provided, exceeding 2000 V for HBM (class 2) and 1000 V for CDM (class C3).

The 74HC244D,653 is an octal bus interface device with non-inverting 3-state outputs. Its design includes clamp diodes on the inputs, allowing the use of current-limiting resistors for interfacing with voltages exceeding VCC. This makes it suitable for various digital signal buffering and driving applications.