Texas Instruments 74ALVCH16245ZQLR

Overview

74ALVCH16245ZQLR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two voltage-domain buses operating from 1.65 V to 3.6 V. It features ±24-mA output drive at 3.3 V, 3 ns max propagation delay, bus-hold circuitry on all I/O pins, and 5.5-V tolerant inputs-enabling level translation (e.g., 5 V → 3.3 V) in server backplanes and telecom interface modules.

For engineers reviewing the 74ALVCH16245ZQLR datasheet, 74ALVCH16245ZQLR pinout, 74ALVCH16245ZQLR application, or 74ALVCH16245ZQLR equivalent, this device is selected for high-drive, low-voltage bidirectional bus interfacing where signal integrity across long PCB traces, immunity to floating inputs, and power-up high-impedance safety are critical design requirements.

Technical Context

The 74ALVCH16245ZQLR implements dual independent 8-bit transceivers, each controlled by dedicated DIR and OE inputs. Direction control is synchronous and edge-independent: DIR = H enables A→B data flow; DIR = L enables B→A flow. Output enable (OE) asserts active-low, placing both A- and B-port outputs into high-impedance when high.

Its CMOS input structure includes active bus-hold circuitry on all 32 I/O pins-eliminating external pull resistors-and supports overvoltage-tolerant inputs up to 5.5 V regardless of VCC, enabling robust down-translation in mixed-voltage systems without level shifters.

Key Specifications

Pinout & Package

BGA MICROSTAR JUNIOR (56-ball) package, 5.50 mm × 8.00 mm body size, 0.5-mm ball pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16245DGGR and SN74ALVCH16245DL, the 74ALVCH16245ZQLR offers superior thermal performance (RθJA = 42°C/W) and minimal PCB footprint (5.5 × 8.0 mm), making it optimal for space-constrained, thermally demanding telecom and server modules where BGA reflow capability exists.

Availability

74ALVCH16245ZQLR is available at Aetrix Electronics and suitable for cable modem termination systems, server backplanes, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for 74ALVCH16245ZQLR 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 company delivering analog and embedded processing solutions, with leadership in logic, interface, and power management ICs for industrial, automotive, and communications markets.

The SN74ALVCH16245 product line delivers high-speed, low-voltage, level-translating bus transceivers optimized for voltage-domain bridging in infrastructure equipment-designed to replace discrete resistor networks and multiple single-bit buffers with integrated, reliable, space-saving solutions.

FAQ

What is the maximum operating voltage tolerance on the inputs of the 74ALVCH16245ZQLR?

The 74ALVCH16245ZQLR supports input voltages up to 5.5 V regardless of VCC level-enabling direct interfacing with 5 V logic while powered from 1.65 V to 3.6 V supplies. This overvoltage tolerance is specified across the full operating temperature range (–40 °C to +85 °C) and eliminates external level-shifting components in mixed-voltage systems. The 74ALVCH16245ZQLR input structure is designed to safely clamp and route these signals without damage or functional disruption.

How does the bus-hold feature function on the 74ALVCH16245ZQLR, and what design benefit does it provide?

The 74ALVCH16245ZQLR integrates active bus-hold circuitry on all 32 I/O pins, which applies a weak feedback current (±75 µA at 3.0 V) to maintain the last-valid logic state when an input is undriven or floating. This eliminates the need for 32 external pullup or pulldown resistors-reducing BOM cost, saving PCB area, and removing potential sources of noise coupling. The 74ALVCH16245ZQLR bus-hold operates independently of VCC and remains effective across its full 1.65–3.6 V supply range.

Can the 74ALVCH16245ZQLR be used for bidirectional level translation between 5 V and 1.8 V buses?

Yes-the 74ALVCH16245ZQLR supports true bidirectional down-translation: 5 V signals applied to its inputs are safely accepted and translated to 1.8 V-compatible outputs when VCC = 1.8 V, and conversely, 1.8 V signals on the opposite port are driven out at 5 V-compatible levels due to its 5.5-V tolerant inputs. The 74ALVCH16245ZQLR achieves this without external components, leveraging its wide VCC range and overvoltage-safe input structure-verified in TI's application note SCBA004.

What is the recommended power-up sequence to ensure high-impedance behavior at startup for the 74ALVCH16245ZQLR?

To guarantee high-impedance outputs during power-up, tie both 1OE and 2OE inputs to VCC through a pullup resistor-TI recommends ≥10 kΩ for standard drivers. This ensures OE remains HIGH (inactive) until VCC stabilizes, preventing bus contention. The 74ALVCH16245ZQLR internal power-on reset circuitry does not override OE; thus external biasing is mandatory. Each VCC pin must also have a dedicated 0.1-µF ceramic bypass capacitor placed within 3 mm.

Does the 74ALVCH16245ZQLR support hot-swap or live-insertion applications?

Yes-the 74ALVCH16245ZQLR is suitable for hot-swap applications due to its bus-hold inputs (preventing floating states), high-impedance default on OE, and robust ESD protection (2000 V HBM). When OE is held HIGH during insertion, all I/Os remain in Hi-Z, avoiding back-driving live buses. Its 5.5-V tolerant inputs tolerate voltage glitches during mating, and the 74ALVCH16245ZQLR's latch-up immunity (>250 mA per JESD17) further enhances system resilience during transient events.