Texas Instruments CD74HC240M96

Overview

CD74HC240M96 from Texas Instruments is an inverting octal buffer/line driver with three-state outputs and two active-low output enables, operating from 2 V to 6 V. It delivers 8 ns typical propagation delay at 5 V/15 pF, supports ±25 mA output drive per pin, and functions across –55°C to +125°C for industrial bus interface applications.

For engineers reviewing the CD74HC240M96 datasheet, CD74HC240M96 pinout, CD74HC240M96 application, or CD74HC240M96 equivalent, key selection criteria include its inverting logic polarity, dual active-low enable architecture, high-noise-immunity CMOS inputs (NIL/NIH = 30% of VCC), and compatibility with LSTTL-loaded buses requiring bidirectional data isolation.

Technical Context

The CD74HC240M96 implements eight independent inverting buffer channels, each with separate input and three-state output, controlled by two global active-low output-enable signals (1OE and 2OE). Its logic structure isolates two groups of four outputs-Y1–Y4 and Y5–Y8-enabling selective bus driving without contention.

All inputs are buffered with hysteresis-free CMOS gates; outputs feature high-current bus-driver capability (±25 mA) and low-output-capacitance design (CO = 20 pF). The device uses standard HC process technology, ensuring rail-to-rail voltage transfer and balanced tPLH/tPHL timing under varying load and temperature conditions.

Key Specifications

Pinout & Package

CD74HC240M96 is packaged in a 20-pin SOIC (Small Outline Integrated Circuit) with nominal body size 12.80 mm × 7.50 mm and standard JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC240N and CD74HCT240M96, the CD74HC240M96 offers broader supply flexibility (2–6 V) and superior thermal performance in surface-mount production, making it optimal for new designs targeting cost-effective, high-volume SMT assembly with wide input voltage tolerance.

Availability

CD74HC240M96 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for CD74HC240M96 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 ICs, with over 90 years of innovation in industrial, automotive, and communications markets.

The CD74HC240M96 belongs to TI's High-Speed CMOS Logic family, designed specifically for robust, low-power bus interface and signal conditioning in harsh-environment embedded systems.

FAQ

What logic function does the CD74HC240M96 implement?

The CD74HC240M96 implements an inverting octal buffer with three-state outputs and two active-low output-enable inputs (1OE and 2OE). Each of its eight channels inverts the input signal and drives the corresponding output only when its group's enable is asserted low; otherwise, the output enters high-impedance state. This architecture supports bidirectional bus control and signal isolation in multi-master systems.

Can CD74HC240M96 operate at 3.3 V supply voltage?

Yes, CD74HC240M96 is fully specified to operate from 2 V to 6 V, including 3.3 V nominal supply. At 3.3 V, it maintains guaranteed VOH ≥ 3.15 V and VOL ≤ 0.33 V under 6 mA load, with propagation delay increasing to ~12 ns (typical) versus 8 ns at 5 V. Input thresholds scale proportionally (VIH = 2.31 V min, VIL = 1.09 V max), ensuring interoperability with 3.3 V logic families.

What is the maximum output current per pin for CD74HC240M96?

The CD74HC240M96 supports ±25 mA DC output current per pin, verified across –55°C to +125°C. This allows direct driving of 15 LSTTL loads or discrete LEDs, relays, or small-signal MOSFET gates. Continuous total supply current must remain ≤ ±70 mA, and simultaneous sourcing/sinking across all eight outputs requires careful thermal design due to SOIC package power dissipation limits.

How does the dual output-enable architecture of CD74HC240M96 improve bus arbitration?

The CD74HC240M96's two independent active-low enables (1OE and 2OE) allow separate control of two 4-bit output groups (Y1–Y4 and Y5–Y8). This enables time-sliced bus access-e.g., one group driving address lines while the other drives data-without external logic. It reduces bus contention risk and eliminates need for additional gating ICs in systems with segmented memory or peripheral addressing schemes.

Is CD74HC240M96 pin-compatible with CD74HCT240M96?

Yes, CD74HC240M96 and CD74HCT240M96 share identical pinout, package (SOIC-20), and functional block diagram. They differ only in input threshold specifications and supply range: CD74HC240M96 operates from 2–6 V with CMOS-compatible inputs, while CD74HCT240M96 is limited to 4.5–5.5 V and features TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V). Substitution is electrically safe but requires verification of system-level voltage and noise margins.