onsemi 74LVTH16952MEAX

Overview

74LVTH16952MEAX from Fairchild Semiconductor is a low-voltage 16-bit registered transceiver with 3-STATE outputs, designed for bidirectional data flow between two 8-bit buses. It features separate clock (CPABn/CPBAn), clock enable (CEAn/CEBn), and output enable (OEABn/OEBAn) controls per register, bushold inputs eliminating external pull-ups, and ±32 mA/64 mA drive capability. It operates at 2.7–3.6 V VCC while interfacing with 5 V TTL systems.

For engineers reviewing the 74LVTH16952MEAX datasheet, pinout, applications, or equivalent options, key selection criteria include its dual 8-bit registered bus interface, bushold input support, 150 MHz max clock frequency, 3-STATE output timing (tPZH ≤ 4.9 ns), and SSOP-56 package compatibility with JEDEC MO-118.

Technical Context

The 74LVTH16952MEAX implements two independent 8-bit registers-A-register (A0–A15 inputs → B0–B15 outputs) and B-register (B0–B15 inputs → A0–A15 outputs)-with asynchronous 3-STATE control per direction. Clock enable (CEAn/CEBn) gates register updates, while output enable (OEABn/OEBAn) independently places each register's outputs in high-impedance state.

Its bushold circuitry on all data inputs (A0–A15, B0–B15) maintains valid logic states without external biasing, supporting live insertion/extraction. The BiCMOS process enables 150 MHz operation with low ICCZ (0.19 mA) in 3-STATE mode and robust ESD protection (>2000V HBM).

Key Specifications

Pinout & Package

74LVTH16952MEAX is housed in a 56-lead Shrink Small Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch and exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVTH16952MEAX, the 74LVT16952MEA lacks bushold and increases BOM complexity, while SN74LVTH16952DGGR offers identical functionality in a narrower TSSOP package-requiring PCB layout change but enabling higher-density routing and TI supply chain alignment.

Availability

74LVTH16952MEAX is available at Aetrix Electronics and suitable for high-speed backplane interfaces, hot-swappable module buses, and mixed-voltage system bridges requiring stable component supply, long-term lifecycle assurance, and JEDEC-compliant SSOP packaging.

Supply support for 74LVTH16952MEAX 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

Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The 74LVTH16952MEAX belongs to Fairchild's LVT/LVTH advanced BiCMOS logic family, engineered for 3.3 V systems needing TTL interoperability, high-speed registered data transfer, and robust bus isolation in mission-critical embedded environments.

FAQ

What is the maximum clock frequency supported by the 74LVTH16952MEAX?

The 74LVTH16952MEAX supports a guaranteed maximum clock frequency of 150 MHz across the full operating temperature range (−40°C to +85°C) and VCC = 2.7–3.6 V. This specification applies to both CPABn and CPBAn inputs and is validated under CL = 50 pF and RL = 500 Ω loading conditions per the official Fairchild datasheet DS500103.

Does the 74LVTH16952MEAX require external pull-up resistors on its data inputs?

No, the 74LVTH16952MEAX does not require external pull-up resistors because it includes bushold circuitry on all A0–A15 and B0–B15 data inputs. This feature actively holds the last valid logic state at each input, eliminating floating nodes and simplifying board design-confirmed in the "Features" and DC Electrical Characteristics sections of the Fairchild DS500103 datasheet.

What package type is used for the 74LVTH16952MEAX?

The 74LVTH16952MEAX uses a 56-lead Shrink Small Outline Package (SSOP) with JEDEC MO-118 compliance, 0.300" body width, and package number MS56A. Its pin pitch is 0.025", and it is designed for surface-mount reflow assembly-explicitly documented in the "Ordering Code" table and Physical Dimensions section of DS500103.

Can the 74LVTH16952MEAX interface directly with 5 V TTL logic?

Yes, the 74LVTH16952MEAX can interface directly with 5 V TTL logic: its inputs tolerate up to 5.5 V (VI = 0–5.5 V), and its outputs drive −32 mA (HIGH) and +64 mA (LOW) into 5 V loads. This dual-voltage capability is explicitly stated in the General Description and DC Electrical Characteristics tables of DS500103.

What is the purpose of the OEABn and OEBAn pins on the 74LVTH16952MEAX?

The OEABn and OEBAn pins are active-low output enable controls for the A→B and B→A data paths respectively. When asserted LOW, they enable the corresponding register's outputs; when HIGH, they place those outputs in high-impedance (3-STATE) mode. This allows independent bus isolation per direction-critical for avoiding contention in shared-bus architectures-as defined in the Pin Descriptions and Truth Table of DS500103.