Texas Instruments SN74ALVCH16245DL

Overview

SN74ALVCH16245DL from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 16-bit buses operating at 1.65 V to 3.6 V. It features ±24-mA output drive at 3.3 V, 3 ns max propagation delay, bus-hold on all I/O pins, and operates across –40°C to +85°C. It is used in server backplanes and telecom infrastructure where level translation and high-drive bus interfacing are required.

For engineers reviewing the SN74ALVCH16245DL datasheet, SN74ALVCH16245DL pinout, SN74ALVCH16245DL application, or SN74ALVCH16245DL equivalent, key selection criteria include 48-pin SSOP package compatibility, 1.65–3.6 V supply range, direction-control and output-enable logic behavior, and bus-hold functionality eliminating external resistors.

Technical Context

The SN74ALVCH16245DL implements dual independent 8-bit transceivers (A↔B), each controlled by dedicated DIR and OE inputs. Its bus-hold circuitry actively maintains valid logic states on undriven A- and B-port inputs without external biasing, reducing system component count.

Direction control is synchronous and noninverting: when DIR = HIGH, data flows A→B; when DIR = LOW, data flows B→A. OE asserts high-impedance on both ports when HIGH, and enables outputs when LOW - supporting hot-swap isolation and bus sharing in multi-master systems.

Key Specifications

Pinout & Package

SN74ALVCH16245DL is housed in a 48-pin SSOP (Shrink Small Outline Package) with 0.635 mm pitch, body size 7.50 mm × 15.80 mm, and exposed pad not present. Pin 1 is located at bottom-left corner (index mark adjacent to pin 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16245DL, SN74LVC16245ADGGR offers lower system cost but requires additional passives, while 74AVC16245DGG delivers superior timing performance at the expense of bus-hold functionality - making SN74ALVCH16245DL optimal for flexible, maintenance-prone, or space-constrained industrial backplanes.

Availability

SN74ALVCH16245DL is available at Aetrix Electronics and suitable for cable modem termination systems, telecom infrastructure equipment, and network switch backplanes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74ALVCH16245DL 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-reliability interface ICs for industrial and communications markets.

The SN74ALVCH16245DL belongs to TI's Widebus™ family of advanced CMOS bus transceivers, engineered specifically for robust, low-power, mixed-voltage bidirectional data transfer in dense, thermally constrained systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH16245DL?

TI recommends tying OE to VCC via a pullup resistor during power-up to ensure outputs remain in high-impedance until supply stabilizes. For SN74ALVCH16245DL, a 10-kΩ resistor is typical; minimum value depends on driver sink capability. DIR may be left floating only if bus-hold is active - but best practice is to tie DIR to defined logic level (VCC or GND) to prevent transient contention.

Does SN74ALVCH16245DL support hot-swap operation?

Yes, SN74ALVCH16245DL supports hot-swap operation when OE is held HIGH during insertion. Its 2000-V HBM ESD rating and bus-hold circuitry prevent latch-up or undefined states on undriven lines. However, power sequencing must ensure VCC ramps before signal assertion, and current limits (±24 mA per output, ±100 mA total VCC/GND) must not be exceeded during transition.

Can SN74ALVCH16245DL translate 5-V signals to 1.8-V logic levels?

Yes - SN74ALVCH16245DL accepts input voltages up to 5.5 V regardless of VCC, enabling reliable down-translation from 5-V peripherals to 1.8-V or 2.5-V processors. When VCC = 1.8 V, outputs swing rail-to-rail (0 V to 1.8 V), and VIH/VIL thresholds scale accordingly (VIH ≈ 1.17 V min at 1.8 V). No external level shifter is needed.

How does bus-hold functionality work on SN74ALVCH16245DL, and can it be disabled?

Bus-hold on SN74ALVCH16245DL uses internal feedback circuitry to maintain the last-valid logic state on any undriven A- or B-port pin, drawing ±75 µA at 3 V. It cannot be disabled - it is always active. TI explicitly advises against using external pullup/pulldown resistors with bus-hold, as they conflict and increase power consumption or cause logic errors.

What thermal considerations apply to SN74ALVCH16245DL in continuous operation?

SN74ALVCH16245DL has a junction-to-ambient thermal resistance (RθJA) of 63°C/W in its SSOP (DL) package. At full 24-mA drive on all 16 outputs (480 mA total IOUT), power dissipation reaches ~150 mW - raising junction temperature ~9.5°C above ambient. For sustained high-load operation in +70°C environments, ensure ≥100 mm² copper pour under the package and avoid stacking heat-generating components nearby.