Texas Instruments SN74ABT2952ANSR

Overview

SN74ABT2952ANSR from Texas Instruments is an octal bus transceiver and register with 3-state outputs, implementing two independent 8-bit back-to-back registers for bidirectional data flow between A and B buses. It operates at 4.5–5.5 V, supports up to 150 MHz clock frequency, delivers ±64 mA output drive, and features noninverting outputs with typical VOLP < 1 V - used in high-speed board-level bus isolation and data buffering in industrial control backplanes.

For engineers reviewing the SN74ABT2952ANSR datasheet, SN74ABT2952ANSR pinout, SN74ABT2952ANSR application, or SN74ABT2952ANSR equivalent, key selection criteria include its dual-register latch timing (tsu = 2.5 ns, th = 1.5 ns), 3-state enable propagation delays (tPZH = 1.5 ns), thermal performance in SOIC-24 package (θJA = 81°C/W), and compatibility with 5-V TTL/CMOS logic systems.

Technical Context

The SN74ABT2952ANSR uses EPIC-II^B BiCMOS process to achieve low power dissipation while maintaining high-speed switching. Its dual-clock architecture supports independent A→B (CLKAB/CLKENAB/OEAB) and B→A (CLKBA/CLKENBA/OEBA) data paths, each with synchronous latching on clock rising edge and 3-state output control.

It integrates input clamp diodes, exceeds 500 mA latch-up immunity per JESD17, and provides ESD protection >2000 V (MIL-STD-883) and >200 V (machine model). All control inputs are TTL-compatible with VIH = 2 V, VIL = 0.8 V, and input leakage ≤±1 µA at VCC = 5.5 V.

Key Specifications

Pinout & Package

SN74ABT2952ANSR is packaged in a 24-pin plastic small-outline (SOIC) package (DW suffix), with 300-mil body width, gull-wing leads, and RoHS-compliant NiPdAu finish. Pin 1 is located in quadrant Q1 per tape-and-reel standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2952ANSR, SN74ABT245NSR lacks clocked register functionality and offers reduced drive strength, making it inadequate for synchronous bus bridging; SN74LVTH245ADW operates exclusively at 3.3 V and cannot interface directly with 5-V TTL buses without translation.

Availability

SN74ABT2952ANSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment data routing, and embedded controller expansion requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT2952ANSR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ABT2952ANSR belongs to TI's ABT logic family, designed specifically for high-speed, low-noise 5-V bus interfacing with registered data flow and robust ESD/latch-up immunity.

FAQ

What is the maximum clock frequency supported by SN74ABT2952ANSR?

The SN74ABT2952ANSR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is confirmed in the timing requirements table of the official datasheet (SCBS203D), and applies to both CLKAB and CLKBA inputs. At temperature extremes (–40°C to +85°C) and supply variations (4.5–5.5 V), timing margins remain valid per published min/max specifications. The SN74ABT2952ANSR achieves this performance using EPIC-II^B BiCMOS technology to balance speed and power.

Does SN74ABT2952ANSR support true bidirectional synchronous data transfer?

Yes, SN74ABT2952ANSR supports true bidirectional synchronous data transfer via two independent 8-bit register paths: A→B controlled by CLKAB/CLKENAB/OEAB and B→A controlled by CLKBA/CLKENBA/OEBA. Each path captures data on the rising edge of its respective clock when the corresponding clock-enable is low and output-enable is low. This architecture enables full-duplex, clock-domain-isolated communication without external logic, distinguishing SN74ABT2952ANSR from simple transceivers like SN74ABT245NSR.

What is the recommended power-up sequence for SN74ABT2952ANSR to ensure high-impedance outputs?

To ensure high-impedance outputs during power-up or power-down, OEAB and OEBA must be held high until VCC stabilizes. TI recommends tying both OE inputs to VCC through pullup resistors; the minimum resistor value depends on the driver's current-sinking capability but is typically ≥1 kΩ for standard logic drivers. This prevents bus contention during supply ramp-up. The SN74ABT2952ANSR does not include internal power-on reset circuitry, so external OE control or RC-based hold-off is required for robust system initialization.

Is SN74ABT2952ANSR compatible with 3.3-V logic inputs?

No, SN74ABT2952ANSR is not guaranteed compatible with 3.3-V logic inputs. Its input thresholds are TTL-compatible: VIH = 2.0 V minimum and VIL = 0.8 V maximum at VCC = 5 V. While a 3.3-V high signal may exceed VIH in many cases, voltage margin is marginal and not assured across process/voltage/temperature corners. For reliable 3.3-V-to-5-V interfacing, level-shifting circuitry or a 3.3-V–tolerant device such as SN74LVC245A should be used instead of relying on SN74ABT2952ANSR for mixed-voltage operation.

What package type and lead finish does SN74ABT2952ANSR use?

SN74ABT2952ANSR uses a 24-pin plastic small-outline integrated circuit (SOIC) package designated DW, with 300-mil body width and gull-wing leads. Its lead finish is NiPdAu (nickel-palladium-gold), RoHS-compliant, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). The package drawing is compliant with JEDEC MS-012, and pin 1 orientation follows quadrant Q1 per tape-and-reel standard - verified from TI's packaging addendum dated 15-Jul-2026.