Texas Instruments CD74AC652M96

Overview

CD74AC652M96 from Texas Instruments is an octal bus transceiver with 3-state outputs and non-inverting data flow, designed for bidirectional data transfer between two 8-bit buses in TTL/CMOS mixed-signal systems. It operates from 1.5V to 5.5V, supports ±24mA output drive, and features propagation delay of 8.5ns (V_CC = 5V, C_L = 50pF). It is used in industrial control backplanes and legacy microprocessor data bus interfaces.

For engineers reviewing the CD74AC652M96 datasheet, CD74AC652M96 pinout, CD74AC652M96 application, or CD74AC652M96 equivalent, key selection criteria include its 24-pin SOIC (DW) package, 3-state enable timing, symmetric bidirectional drive capability, and compatibility with both AC and ACT logic families in level-shifted bus architectures.

Technical Context

The CD74AC652M96 implements dual 8-bit bidirectional transceivers with separate transmit (T̅) and receive (R̅) controls per direction, enabling independent bus arbitration. Its output-enable logic uses active-low OE inputs tied to direction-control signals, and all outputs are fully 3-state compatible with high-impedance off-state leakage < ±10μA.

It meets AC logic family specifications: input thresholds scale with V_CC, noise margin ≥ 1.0V at V_CC = 5V, and static drive capability supports direct connection to 74LS loads without pull-ups. No internal clamping diodes are present-external ESD protection is required per IEC 61000-4-2 Level 2.

Key Specifications

Pinout & Package

CD74AC652M96 is housed in a 24-pin SOIC (DW) package, 7.5mm body width, 2.65mm height, with 1.27mm pitch and gull-wing leads. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.

Compared with CD74ACT652M96 and SN74LVC245APW, the CD74AC652M96 uniquely balances 1.5–5.5V operation, robust ±24mA drive across that range, and proven reliability in long-lifecycle industrial backplanes - making it the preferred choice for voltage-flexible legacy upgrades.

Availability

CD74AC652M96 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor data bus extensions, and programmable logic interconnect applications requiring stable component supply over extended production lifecycles.

Supply support for CD74AC652M96 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 over 90 years of innovation in industrial, automotive, and communications electronics.

The CD74AC652M96 belongs to TI's legacy AC logic family, engineered for robust, wide-supply-voltage bidirectional bus interfacing in mission-critical industrial and aerospace systems where long-term availability and electrical predictability are essential.

FAQ

What is the maximum operating frequency supported by CD74AC652M96?

The CD74AC652M96 does not specify a maximum clock frequency in its datasheet, but its 8.5ns typical propagation delay at V_CC = 5V and C_L = 50pF supports reliable operation up to 80MHz in synchronous bus transfer modes. System-level timing must account for setup/hold margins, PCB trace delays, and load capacitance - the CD74AC652M96 itself remains functional across this range when properly decoupled and terminated.

Is CD74AC652M96 pin-compatible with CD74ACT652M96?

Yes, CD74AC652M96 and CD74ACT652M96 share identical 24-pin SOIC (DW) packaging and pinout, including matching A/B-side I/O, OE, T̅, V_CC, and GND assignments. However, they differ in input threshold levels and propagation characteristics - the CD74AC652M96 uses CMOS-compatible thresholds while CD74ACT652M96 uses TTL-compatible thresholds, so direct substitution requires verification of driving source logic family.

Does CD74AC652M96 include built-in ESD protection diodes?

No, CD74AC652M96 does not integrate input or output ESD protection diodes. Its HBM rating of ±2000V is achieved through process-level design, not clamp structures. For IEC 61000-4-2 compliance, external TVS diodes or series resistors must be added on all I/O lines - especially critical in industrial backplane applications where CD74AC652M96 interfaces with connectors exposed to handling discharge.

Can CD74AC652M96 operate reliably at 3.3V with 5V-tolerant inputs?

CD74AC652M96 operates correctly at V_CC = 3.3V and accepts input voltages up to V_CC + 0.5V (i.e., 3.8V), but it is not 5V-tolerant. Applying 5V inputs while V_CC = 3.3V risks latch-up or damage. For true 5V-tolerant operation at 3.3V supply, TI recommends the CD74AC652M96 only in systems where driving sources are limited to ≤3.8V - or paired with external level-shifting circuitry when interfacing to 5V buses.

What is the recommended decoupling for CD74AC652M96?

TI specifies a minimum 0.1μF ceramic capacitor placed within 5mm of each V_CC–GND pair (pins 21–22 and 23–24) on the CD74AC652M96. For high-noise environments or systems with >10MHz switching activity, add a 4.7μF tantalum or polymer capacitor nearby. Avoid shared vias between decoupling caps and signal traces - the CD74AC652M96's dual power/ground pins are designed to support low-inductance local bypassing.