Texas Instruments SN74ALVCH162827VR

Overview

SN74ALVCH162827VR from Texas Instruments is a 20-bit noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features two independent 10-bit sections (1A/1Y and 2A/2Y), dual output-enable inputs per section (1OE1/1OE2, 2OE1/2OE2), integrated bus-hold circuitry on all data inputs, and on-die 26-Ω series output resistors-enabling clean signal integrity in high-speed memory and bus interface applications.

For engineers reviewing the SN74ALVCH162827VR datasheet, SN74ALVCH162827VR pinout, SN74ALVCH162827VR application, or SN74ALVCH162827VR equivalent, key selection criteria include its dual-section 3-state control logic, bus-hold input stabilization (eliminating external pull resistors), 12-mA sink capability, 1.8-V/2.5-V/3.3-V compatible switching, and TVSOP-56 (DGV) package footprint for space-constrained PCB layouts.

Technical Context

The SN74ALVCH162827VR implements a dual 10-bit noninverting buffer architecture where each Y-output group activates only when both corresponding OE inputs are low-providing precise per-section output gating. Its bus-hold circuitry maintains stable logic states on undriven A-inputs without external components, reducing BOM count and layout complexity.

Output drivers integrate 26-Ω series termination to suppress overshoot/undershoot at up to 12 mA sink current, while propagation delay remains ≤4.4 ns (V_CC = 2.5 V) and enable/disable times stay under 6.3 ns-supporting reliable timing in DDR memory subsystems and parallel data buses operating up to 100 MHz.

Key Specifications

Pinout & Package

SN74ALVCH162827VR is housed in a 56-pin Thin Very Small Outline Package (TVSOP, JEDEC MO-194, TI drawing DGV), measuring 11.4 mm × 4.5 mm × 1.2 mm max height, with 0.4-mm lead pitch and exposed metal pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit buffer/driver applications.

Compared with SN74LVC16244ADGGR and SN74AVC16T245DGGR, the SN74ALVCH162827VR uniquely combines dual-section 3-state control, bus-hold input stabilization, and on-die series termination-making it optimal for unidirectional, high-reliability parallel bus applications where layout simplicity and signal integrity are critical.

Availability

SN74ALVCH162827VR is available at Aetrix Electronics and suitable for memory interface buffering, industrial I/O expansion, test equipment signal routing, and automotive diagnostic interface applications requiring stable component supply and long-term production continuity.

Supply support for SN74ALVCH162827VR 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 innovation in high-speed interface and power-efficient logic families.

The SN74ALVCH162827VR belongs to TI's Widebus™ family-designed specifically for high-density, high-speed parallel bus applications in computing, communications, and industrial systems where signal integrity, low power, and design simplicity are essential.

FAQ

What is the function of the dual output-enable inputs (e.g., 1OE1 and 1OE2) on the SN74ALVCH162827VR?

Each 10-bit section of the SN74ALVCH162827VR requires both OE inputs (e.g., 1OE1 and 1OE2) to be low for its Y outputs to drive; if either is high, all ten outputs enter high-impedance state. This dual-enable architecture prevents partial activation and enhances noise immunity during power sequencing or fault conditions. The SN74ALVCH162827VR thus provides deterministic, glitch-free bus control not achievable with single-OE buffers.

Does the SN74ALVCH162827VR require external pullup or pulldown resistors on its A-inputs?

No. The SN74ALVCH162827VR integrates active bus-hold circuitry on all 20 data inputs (1A1–1A10, 2A1–2A10), which maintains valid logic states on undriven or floating inputs without external resistors. This feature eliminates 20 discrete components, reduces PCB area, and improves reliability in systems with intermittent signal asserts-confirmed in TI's SCES013H datasheet Section 1.

What is the maximum clock or data rate supported by the SN74ALVCH162827VR?

The SN74ALVCH162827VR does not specify a maximum clock frequency, but its propagation delay (≤4.4 ns at V_CC = 2.5 V) and output transition times support reliable operation in parallel bus systems running up to ~100 MHz. Real-world performance depends on trace length, load capacitance, and termination-TI's switching characteristics table (SCES013H, Page 4) confirms sub-5-ns timing across 1.8-V to 3.3-V operation, making the SN74ALVCH162827VR suitable for DDR SDRAM command/address busing.

Can the SN74ALVCH162827VR be used in a 5-V system?

No. The SN74ALVCH162827VR has an absolute maximum V_CC rating of 4.6 V and a recommended operating range of 1.65 V to 3.6 V. Applying 5 V exceeds its safe operating limits and risks permanent damage. For 5-V systems, consider TI's SN74AS series or other 5-V tolerant logic families-not the SN74ALVCH162827VR.

What is the thermal performance of the SN74ALVCH162827VR in its TVSOP (DGV) package?

The SN74ALVCH162827VR in the TVSOP-56 (DGV) package has a junction-to-ambient thermal resistance (θ_JA) of 48 °C/W, per TI's SCES013H datasheet Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper pour under the exposed pad. The device operates safely from –40°C to +85°C ambient, with internal junction temperature remaining within limits under typical 20-bit switching loads.