Texas Instruments SN74ALVCH16245DGG

Overview

SN74ALVCH16245 from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-compatible buses operating from 1.65 V to 3.6 V. It features dual 8-bit sections, bus-hold circuitry eliminating external pull resistors, and independent direction (DIR) and output-enable (OE) controls. It is used in industrial control backplanes and low-voltage memory expansion interfaces.

For engineers reviewing the SN74ALVCH16245 datasheet, SN74ALVCH16245 pinout, SN74ALVCH16245 application, or SN74ALVCH16245 equivalent, key selection criteria include VCC range compatibility (1.65–3.6 V), 3-state isolation timing (tdis ≤ 5.2 ns at 2.7 V), bus-hold input retention, and DGG package thermal impedance (89°C/W).

Technical Context

The SN74ALVCH16245 implements two independent 8-bit transceiver channels, each with separate DIR and OE inputs enabling flexible A↔B or B↔A data flow control. Its EPIC™ submicron CMOS process delivers low propagation delay (tpd ≤ 3.7 ns at 1.8 V) and high noise immunity via bus-hold on all data inputs.

Logic operation follows a strict function table: OE = L enables transmission, with DIR = L routing B→A and DIR = H routing A→B; OE = H forces all outputs into high-impedance isolation. Power-up/down isolation is ensured by pulling OE to VCC via an external resistor.

Key Specifications

Pinout & Package

SN74ALVCH16245 is packaged in a 48-pin Thin Shrink Small-Outline (DGG) package with 0.5-mm pitch, 10.0 mm × 6.2 mm body size, and exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and 74AVC16245DGG, the SN74ALVCH16245 uniquely combines 1.65–3.6 V operation, integrated bus-hold, and industrial temperature range - making it optimal for mixed-voltage industrial systems where component count reduction and robustness outweigh marginal speed gains.

Availability

SN74ALVCH16245 is available at Aetrix Electronics and suitable for industrial backplane interfaces, low-voltage memory expansion, configurable peripheral bridges, and legacy ISA bus adapters requiring stable component supply and long-term manufacturability.

Supply support for SN74ALVCH16245 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 experience in high-reliability industrial and automotive IC design.

The SN74ALVCH16245 belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-voltage, high-speed bidirectional data transfer in space-constrained industrial and communications equipment.

FAQ

What is the minimum VCC voltage required for reliable operation of the SN74ALVCH16245?

The SN74ALVCH16245 is characterized for operation down to 1.65 V VCC. Below this threshold, parameters such as VOH, VOL, and tpd are not guaranteed, and bus-hold functionality may become unstable. For designs targeting 1.8-V systems, the SN74ALVCH16245 provides full specification compliance including 3.7-ns propagation delay and ±75-µA bus-hold current - confirming its suitability as a drop-in solution in ultra-low-power industrial controllers.

Does the SN74ALVCH16245 require external pullup resistors on DIR or OE inputs?

No - the SN74ALVCH16245 does not require external pullup resistors on DIR or OE inputs because these are standard CMOS inputs with negligible leakage (±5 µA max). However, OE must be actively driven or pulled to VCC via a resistor during power-up/down to ensure outputs remain in high-impedance state; TI recommends a 10-kΩ pullup for most applications. The SN74ALVCH16245's bus-hold feature applies only to data inputs (A/B ports), not control pins.

Can the SN74ALVCH16245 be used to interface 3.3-V and 1.8-V buses without external level shifters?

Yes - the SN74ALVCH16245 supports VCC from 1.65 V to 3.6 V and tolerates input voltages up to VCC + 0.5 V, allowing safe 3.3-V signals to be applied when VCC = 1.8 V (with appropriate current limiting per absolute max ratings). However, for guaranteed 3.3-V-to-1.8-V translation with full logic-level compatibility, VCC should be set to 3.3 V and external series resistors used on 3.3-V inputs. The SN74ALVCH16245 itself does not perform active level shifting.

How does bus-hold functionality behave on the SN74ALVCH16245 during power-down?

Bus-hold remains active as long as VCC is ≥ 0.8 V; below this, the internal keeper circuit loses bias and releases the input. During controlled power-down, OE should be asserted high first to isolate outputs before VCC decay. The SN74ALVCH16245's bus-hold current (±75 µA at 3 V) ensures stable logic retention on floating A/B lines until VCC drops below operational threshold - critical for preventing glitches in hot-swap or partial-power-down scenarios.

What is the thermal performance of the SN74ALVCH16245 in the DGG package under full 16-bit switching?

In the DGG package, the SN74ALVCH16245 has a θJA of 89°C/W. Under worst-case conditions - all 16 outputs driving 50-pF loads at 10 MHz with 3.3-V supply - typical power dissipation is ~29 mW enabled and ~5 mW disabled. This yields a junction temperature rise of <3°C above ambient, well within the –40°C to +85°C operating range. The SN74ALVCH16245's low ICC (40 µA) and optimized EPIC™ process minimize self-heating even in compact industrial enclosures.