Texas Instruments SN74ABT16952DGGR

Overview

SN74ABT16952DGGR from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data buffering in high-speed bus applications. It features dual 8-bit register sets, ±32-mA high-drive outputs, 150-MHz maximum clock frequency, and operates from –40°C to 85°C on 4.5–5.5-V supply. It enables synchronized A↔B data flow in memory interfaces and backplane systems.

For engineers reviewing the SN74ABT16952DGGR datasheet, SN74ABT16952DGGR pinout, SN74ABT16952DGGR application, or SN74ABT16952DGGR equivalent, key selection criteria include registered data staging, 3-state output control timing (tPLZ = 6.1 ns max), dual-clock enable architecture (CLKENAB/CLKENBA), and TSSOP-56 package compatibility with dense PCB layouts.

Technical Context

The SN74ABT16952DGGR implements two independent 8-bit D-type flip-flop banks-one for A-to-B and one for B-to-A data paths-each controlled by dedicated clock (CLKAB/CLKBA) and clock-enable (CLKENAB/CLKENBA) inputs. Data latching occurs on the low-to-high transition of the respective clock when its enable is low.

Output-enable signals (OEAB/OEBA) independently place each 8-bit port into high-impedance state, supporting bidirectional bus sharing. The device uses EPIC-II^B BiCMOS process for low ground bounce (VOLP < 1 V) and distributed V_CC/GND pins to suppress switching noise at up to 150 MHz operation.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package with 0.5-mm lead pitch, exposed thermal pad optional, JEDEC MO-153 compliant. Pin 1 located at top-left corner (Q1 quadrant), marked by dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered transceiver applications.

Compared with SN74ABT16952DGGR, SN74ABT162245DGGR omits registration for simpler, faster pass-through use, while SN74LVTH16952DGGR trades 5-V compatibility and drive strength for lower voltage operation and static power savings - neither offers pin-compatible replacement without board-level voltage or timing redesign.

Availability

SN74ABT16952DGGR is available at Aetrix Electronics and suitable for memory interface buffering, backplane data multiplexing, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ABT16952DGGR 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 expertise in high-speed interface ICs and industrial-grade reliability.

The SN74ABT16952DGGR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-drive, low-noise, registered data transfer in demanding industrial and communications infrastructure applications.

FAQ

What is the maximum clock frequency supported by the SN74ABT16952DGGR?

The SN74ABT16952DGGR supports a maximum clock frequency of 150 MHz across its full operating temperature range (–40°C to +85°C) when powered at 4.5–5.5 V. This specification is guaranteed under recommended conditions with CL = 50 pF and applies to both CLKAB and CLKBA inputs. Timing parameters such as t_w (3.3 ns minimum pulse width) and t_su/t_h (3.5 ns / 1 ns) are validated to ensure reliable operation at this rate. The SN74ABT16952DGGR achieves this performance using TI's EPIC-II^B BiCMOS process.

How does the SN74ABT16952DGGR handle power-up and power-down sequencing?

The SN74ABT16952DGGR requires OE inputs to be tied to V_CC via a pullup resistor to ensure outputs remain in high-impedance state during power-up or power-down. TI specifies the minimum resistor value based on the driver's current-sinking capability. This design prevents bus contention or undefined states when supply rails ramp. The SN74ABT16952DGGR does not include internal power-on reset circuitry, so external sequencing or OE control is mandatory for robust system integration.

Can the SN74ABT16952DGGR be used as two independent 8-bit transceivers?

Yes, the SN74ABT16952DGGR can operate as two independent 8-bit registered transceivers. Its architecture divides the 16-bit structure into two groups: Ports 1A/1B and 2A/2B, each with dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) signals. This allows concurrent, asynchronous data transfers - for example, latching data from Port 1A→1B while holding Port 2B→2A - without cross-port interference. The SN74ABT16952DGGR pinout and function table explicitly support this dual-mode configuration.

What is the purpose of the distributed VCC and GND pins on the SN74ABT16952DGGR?

The SN74ABT16952DGGR uses four V_CC (pins 7, 22, 35, 46) and six GND (pins 4, 11, 25, 32, 40, 53) pins to minimize high-speed switching noise and ground bounce. This distributed power/ground scheme reduces inductive impedance in supply paths, lowers VOLP (typical <1 V at 5 V), and maintains signal integrity during simultaneous 32-mA output transitions. It directly supports the device's 150-MHz operation and is a key enabler of its flow-through layout optimization - a feature emphasized in the official datasheet as critical for PCB noise reduction.

Is the SN74ABT16952DGGR pin-compatible with other members of the ABT16952 family?

Yes, the SN74ABT16952DGGR shares identical pinout and functionality with the SN74ABT16952DL (SSOP-56) variant, differing only in package type (TSSOP vs. SSOP) and thermal characteristics (θ_JA = 81°C/W vs. 74°C/W). Both use the same logic diagram, timing specifications, and absolute maximum ratings. However, it is not pin-compatible with non-registered equivalents like SN74ABT162245DGGR, nor with LVTH-family variants such as SN74LVTH16952DGGR, despite shared package outline - differences in voltage tolerance, drive strength, and internal register structure preclude direct substitution without validation.