Texas Instruments SN74ALVCH16825DL

Overview

SN74ALVCH16825DL from Texas Instruments is an 18-bit noninverting 3-state buffer/driver with bus-hold circuitry, designed for 1.65-V to 3.6-V V_CC operation in memory address, clock, and bus-oriented systems. It supports dual 9-bit or single 18-bit configurations, features active-low 2-input AND-gated output-enable control (OE1/OE2), and operates across –40°C to 85°C.

For engineers reviewing the SN74ALVCH16825DL datasheet, SN74ALVCH16825DL pinout, SN74ALVCH16825DL application, or SN74ALVCH16825DL equivalent, key selection criteria include its 56-pin SSOP (DL) package, bus-hold input stabilization, ±24-mA drive strength at 3 V, 3.4-ns typical propagation delay at 2.7 V, and compatibility with mixed-voltage system interfacing.

Technical Context

The SN74ALVCH16825DL implements two independent 9-bit sections, each with separate output-enable inputs (1OE1/1OE2 and 2OE1/2OE2) controlling nine outputs via a 2-input AND gate with active-low logic. Outputs enter high-impedance state when either OE input is high.

Its EPIC™ submicron CMOS process enables low dynamic current (ΔI_CC = 750 µA), bus-hold input current (±75 µA at 3 V), and robust ESD protection (>2000 V HBM, >200 V MM). The device requires no external pullup/pulldown resistors on data inputs due to integrated bus-hold circuitry.

Key Specifications

Pinout & Package

SN74ALVCH16825DL uses a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch, 13.9-mm body width, and 1.2-mm maximum height per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit 3-state buffer applications.

Compared with SN74ALVCH16825DL, SN74ALVCH162245DL adds bidirectional level translation but removes bus-hold and changes functional partitioning, while SN74LVC16245ADL sacrifices 2 bits and all bus-hold capability to reduce cost - making SN74ALVCH16825DL the optimal choice for new 18-bit industrial bus-buffering designs requiring zero-external-component input stabilization.

Availability

SN74ALVCH16825DL is available at Aetrix Electronics and suitable for industrial automation controllers, memory subsystems, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed SSOP (DL) packaging consistency.

Supply support for SN74ALVCH16825DL 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 connectivity technologies, with decades of expertise in high-reliability logic and interface solutions.

The SN74ALVCH16825DL belongs to TI's Widebus™ family of advanced CMOS buffers, engineered specifically for high-density, low-voltage bus interfacing in industrial, computing, and communications infrastructure.

FAQ

What is the recommended power-up sequence for SN74ALVCH16825DL to avoid bus contention?

TI specifies that OE inputs must be held high (inactive) during power-up to force outputs into high-impedance state. Tie 1OE1, 1OE2, 2OE1, and 2OE2 to V_CC via ≥10-kΩ pullup resistors. This ensures SN74ALVCH16825DL outputs remain disabled until system logic asserts valid enable signals - preventing glitches or contention on shared buses.

Does SN74ALVCH16825DL support mixed-voltage operation on inputs and outputs simultaneously?

Yes. SN74ALVCH16825DL accepts input voltages from 0 V to V_CC, and its outputs swing rail-to-rail within the same V_CC domain. When V_CC = 2.5 V, it correctly interprets 1.8-V inputs as valid logic levels per VIH/VIL specs, enabling seamless interfacing between 1.8-V and 2.5-V subsystems without external translators.

How does the bus-hold circuitry in SN74ALVCH16825DL affect input leakage current?

The bus-hold circuitry in SN74ALVCH16825DL actively sources or sinks up to ±75 µA (at V_CC = 3 V) to maintain the last-valid logic state on floating inputs. This is distinct from passive leakage: it is a controlled, low-power feedback mechanism - not parasitic leakage - and is fully characterized in the datasheet's II(hold) parameter table.

Can SN74ALVCH16825DL replace SN74ALVCH16827DL in existing designs?

No. SN74ALVCH16827DL is an inverting 18-bit buffer, whereas SN74ALVCH16825DL is noninverting. Their logic functions are complementary, not interchangeable. Swapping them would invert all 18 data bits - causing functional failure unless compensated by upstream logic inversion.

What thermal considerations apply to SN74ALVCH16825DL in high-density PCB layouts?

SN74ALVCH16825DL has θ_JA = 74°C/W in the DL package. With max ICC = 40 µA static and worst-case dynamic power dissipation ~16 mW (at 3.3 V, 10 MHz), junction temperature rise remains negligible (<1.2°C) under typical conditions - no heatsinking required. However, place decoupling capacitors (0.1 µF ceramic) near each V_CC pin to suppress high-frequency noise.