Texas Instruments CD74HC244M96E4

Overview

CD74HC244M96E4 from Texas Instruments is a non-inverting octal buffer/line driver with three-state outputs and dual active-low output enables, designed for bidirectional bus interfacing in 5 V digital systems. It operates across 2 V to 6 V, delivers ±7.8 mA output drive at 6 V, exhibits 9 ns typical propagation delay (VCC = 4.5 V, CL = 15 pF), and supports industrial temperature range (–55°C to 125°C). It is used in microcontroller address/data bus buffering and memory interface isolation.

For engineers reviewing the CD74HC244M96E4 datasheet, CD74HC244M96E4 pinout, CD74HC244M96E4 application, or CD74HC244M96E4 equivalent, key selection criteria include its dual active-low OE control logic, SOIC-20 package footprint, HC-series CMOS voltage compatibility, and verified 15 LSTTL load drive capability per output.

Technical Context

The CD74HC244M96E4 implements two independent 4-bit non-inverting buffer groups, each controlled by a dedicated active-low output enable (1OE, 2OE). All eight outputs enter high-impedance state when either enable is asserted low, enabling shared-bus contention management without external logic.

Its HC-family design ensures rail-to-rail input thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), 10 pF input capacitance, and 20 pF three-state output capacitance - parameters critical for timing closure in high-speed digital interfaces up to 25 MHz.

Key Specifications

Pinout & Package

CD74HC244M96E4 is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with nominal body size 12.80 mm × 7.50 mm and standard 0.050″ (1.27 mm) lead pitch. The package is RoHS-compliant, surface-mountable, and rated for reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Compared with SN74HC244N and CD74HCT244M96, CD74HC244M96E4 offers surface-mount SOIC packaging for automated assembly, full 2–6 V operation without TTL input constraints, and guaranteed performance across –55°C to +125°C - making it optimal for space-constrained, wide-temperature industrial designs.

Availability

CD74HC244M96E4 is available at Aetrix Electronics and suitable for industrial control systems, automotive diagnostic interfaces, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC244M96E4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families including the CD74HC series.

CD74HC244M96E4 belongs to TI's High-Speed CMOS Logic portfolio, engineered for robust bus interfacing in harsh-environment applications where wide temperature range, noise immunity, and consistent three-state behavior are essential.

FAQ

What is the supply voltage range supported by CD74HC244M96E4?

The CD74HC244M96E4 supports a supply voltage range of 2 V to 6 V, enabling interoperability across 3.3 V and 5 V logic domains without level translation. At VCC = 4.5 V, it guarantees VIH ≥ 3.15 V and VIL ≤ 1.35 V, delivering 30% noise margin. This flexibility makes CD74HC244M96E4 suitable for mixed-voltage industrial and automotive subsystems.

Does CD74HC244M96E4 have pin-to-pin compatibility with other members of the CD74HC24x family?

Yes, CD74HC244M96E4 shares identical pinout with CD74HC240, CD74HC241, CD74HCT240, CD74HCT241, and CD74HCT244 - all 20-pin SOIC devices. However, functional differences exist: CD74HC244M96E4 uses two active-low output enables and non-inverting logic, whereas CD74HC240 is inverting and CD74HC241 mixes active-high/low enables. Pin compatibility enables footprint reuse but requires logic-level verification.

What is the maximum output current per pin for CD74HC244M96E4?

The CD74HC244M96E4 delivers ±7.8 mA output current per pin at VCC = 6 V, as specified in the Electrical Characteristics table for VOH/VOL under IOH/IOL = ±7.8 mA conditions. This supports driving up to 15 LSTTL loads per output, making CD74HC244M96E4 suitable for heavy capacitive bus loads in memory and peripheral interfaces.

How does the three-state control work on CD74HC244M96E4?

CD74HC244M96E4 features two active-low output enables: 1OE (pin 19) controls outputs 1Y1–1Y4, and 2OE (pin 1) controls 2Y1–2Y4. When either enable is high, its associated four outputs enter high-impedance state regardless of input states. Both enables must be low for outputs to reflect their respective inputs. This dual-enable architecture enables granular bus segmentation in CD74HC244M96E4 implementations.

Is CD74HC244M96E4 suitable for automotive under-hood applications?

Yes, CD74HC244M96E4 is qualified for operation from –55°C to +125°C and is widely deployed in automotive ECU diagnostic interfaces, such as K-line buffering between microcontrollers and OBD-II ports. Its HC-family noise immunity (30% VIH/VIL margins), robust three-state leakage (< ±0.5 μA), and SOIC package's thermal performance make CD74HC244M96E4 appropriate for under-hood environments subject to thermal cycling and EMI.