Texas Instruments SN74ALVCH162831GR

Overview

SN74ALVCH162831GR from Texas Instruments is a 1-bit-to-4-bit address register/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It functions as either a transparent buffer (SEL = high) or edge-triggered D-type register (SEL = low), with dual output-enable controls (OE1/OE2), integrated bus-hold circuitry, and on-die 26-Ω series resistors for overshoot/undershoot suppression - ideal for driving four independent memory address buses from a single source.

For engineers reviewing the SN74ALVCH162831GR datasheet, SN74ALVCH162831GR pinout, SN74ALVCH162831GR application, or SN74ALVCH162831GR equivalent, key selection criteria include its dual-mode operation (buffer/register), 36-pin TVSOP (DBB) package, 150-MHz max clock frequency, ±12-mA output drive, and bus-hold-enabled inputs eliminating external biasing in memory interface designs.

Technical Context

This device implements a synchronous 1-bit input → 4-bit output register architecture with independent 9-output groups per OE control. Its dual-function logic (buffer vs. register) is selected solely by the SEL input, while CLK only affects data capture in register mode. The internal D-type flip-flops are positive-edge triggered, and OE asserts high-impedance independently of SEL or CLK state.

Electrical behavior is defined across 1.65–3.6 V supply range: VIH/VIL thresholds scale with V_CC, VOH/VOL meet TTL/CMOS-compatible levels at rated loads, and bus-hold current (±25 µA to ±75 µA) ensures stable logic states on un-driven A inputs without external resistors.

Key Specifications

Pinout & Package

SN74ALVCH162831GR is packaged in a 40-pin TVSOP (DBB) with 0.4-mm pitch, JEDEC MO-153 FF compliant, measuring 10.0 mm × 5.5 mm × 1.2 mm. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise layout from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar address register/driver applications.

Compared with SN74ALVCH162835GR and 74LVC162373APAG, SN74ALVCH162831GR uniquely combines 3.6-V operation, bus-hold, and on-die 26-Ω resistors in a 40-pin TVSOP - reducing BOM count, improving noise immunity, and simplifying layout for multi-bank memory systems.

Availability

SN74ALVCH162831GR is available at Aetrix Electronics and suitable for memory address multiplexing, SRAM interface buffering, and DDR SDRAM address latching requiring stable component supply and long-term industrial availability.

Supply support for SN74ALVCH162831GR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ALVCH162831GR belongs to TI's Widebus™ family of advanced low-voltage CMOS logic devices, engineered specifically for high-speed, low-noise address/data bus interfacing in memory-rich embedded systems.

FAQ

What is the primary functional difference between buffer mode and register mode in the SN74ALVCH162831GR?

In buffer mode (SEL = high), the SN74ALVCH162831GR passes A-input data directly to Y-outputs with minimal propagation delay, independent of CLK. In register mode (SEL = low), data is captured on the rising edge of CLK and held until the next clock edge - making SN74ALVCH162831GR suitable for synchronous address latching in timing-critical memory interfaces.

Does the SN74ALVCH162831GR require external pullup or pulldown resistors on its A inputs?

No. The SN74ALVCH162831GR includes active bus-hold circuitry on all A inputs, which maintains a valid logic state without external biasing. Using pullup or pulldown resistors with SN74ALVCH162831GR is not recommended, as it may interfere with bus-hold operation and increase power consumption.

What is the maximum clock frequency supported by the SN74ALVCH162831GR, and under what conditions is it guaranteed?

The SN74ALVCH162831GR supports a maximum clock frequency of 150 MHz, specified across the full operating temperature range (–40°C to 85°C) and at V_CC = 2.5 V, 2.7 V, and 3.3 V. This rating applies to register mode operation with proper setup/hold timing and CL = 50 pF load.

How does the SN74ALVCH162831GR handle power-up and power-down sequencing to avoid bus contention?

To ensure high-impedance outputs during power-up/down, OE inputs of the SN74ALVCH162831GR should be tied to V_CC through a pullup resistor. The minimum resistor value depends on the driver's current-sinking capability. This prevents undefined output states and avoids contention on shared address buses before system initialization completes.

Can the SN74ALVCH162831GR drive 50-pF loads at 150 MHz without signal integrity issues?

Yes. The SN74ALVCH162831GR integrates 26-Ω series resistors on all outputs, which dampen ringing and reduce overshoot/undershoot when driving 50-pF loads. Measured propagation delay (1.9–4.5 ns at V_CC = 3.3 V) and 10 ns/V input transition rate specification confirm robust high-speed performance with SN74ALVCH162831GR in real-world memory interface layouts.