Texas Instruments 74ALVCH16245GRDR

Overview

74ALVCH16245GRDR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-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, and integrated bus-hold circuitry eliminating external pullup/pulldown resistors. It is used in high-density logic interfacing within industrial control backplanes and FPGA-to-ASIC communication paths.

For engineers reviewing the 74ALVCH16245GRDR datasheet, 74ALVCH16245GRDR pinout, 74ALVCH16245GRDR application, or 74ALVCH16245GRDR equivalent, this page delivers verified electrical parameters, GRD-package terminal mapping, functional behavior under DIR/OE control, and validated drop-in alternatives for 1.8 V/2.5 V/3.3 V mixed-voltage system design.

Technical Context

The 74ALVCH16245GRDR implements two independent 8-bit transceiver sections (A↔B), each controlled by dedicated DIR (direction) and OE (output enable) inputs. Data flows from A to B when DIR = HIGH and OE = LOW; from B to A when DIR = LOW and OE = LOW. Both A- and B-port inputs remain active regardless of OE state, requiring defined logic levels to avoid excess ICCZ.

Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external resistors, and its 54-ball microstar junior (GRD) BGA package supports high I/O density with 36 °C/W thermal impedance. Absolute maximum ratings include 4.6 V supply voltage and –65°C to 150°C storage temperature.

Key Specifications

Pinout & Package

74ALVCH16245GRDR uses a 54-ball microstar junior (GRD) BGA package with 0.8 mm ball pitch, 9.0 mm × 6.0 mm body size, and JEDEC MO-194-compliant footprint. Pin assignment follows standard GRD layout with dedicated power/ground balls distributed across rows C–H for low-inductance decoupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver applications.

Compared with 74ALVCH16245GRDR, SN74ALVCH16245DLR trades thermal efficiency and density for assembly simplicity, while SN74ALVCH16245ZRDR provides identical functionality with environmentally compliant metallurgy-both preserve timing, drive strength, and bus-hold behavior.

Availability

74ALVCH16245GRDR is available at Aetrix Electronics and suitable for industrial automation backplanes, FPGA interconnects, memory expansion subsystems, and test equipment requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for 74ALVCH16245GRDR 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 over 50 years of innovation in high-reliability interface ICs.

The ALVCH family was engineered for low-voltage, high-speed bidirectional bus interfacing in space-constrained systems, emphasizing noise immunity, bus-hold stability, and seamless voltage-domain bridging.

FAQ

What is the recommended power-up sequence for 74ALVCH16245GRDR to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, tie OE pins to VCC through a pullup resistor. The minimum resistance value depends on the driver's current-sinking capability; TI specifies that OE must be held HIGH until VCC stabilizes. This prevents unintended bus contention before system initialization completes. The 74ALVCH16245GRDR itself does not incorporate power-on reset logic, so external sequencing remains essential for safe integration.

Does 74ALVCH16245GRDR support hot-swap operation, and what design precautions apply?

The 74ALVCH16245GRDR supports hot-swap operation due to its latch-up immunity (>250 mA per JESD17) and robust ESD protection (2000-V HBM). However, OE must be held HIGH before applying VCC to prevent output contention. Also, ensure VCC ramp rate stays within 100 ms/V and use series resistors on data lines to limit inrush current. These measures protect both the 74ALVCH16245GRDR and connected devices during live insertion.

How does bus-hold functionality behave on 74ALVCH16245GRDR when VCC = 1.65 V?

At VCC = 1.65 V, the 74ALVCH16245GRDR bus-hold circuitry maintains valid logic states with ±25 µA hold current (per TI SCES015L, Table 3). This ensures reliable input retention even at minimum supply voltage, eliminating need for external biasing. Bus-hold activation is automatic and transparent-no enable/disable control exists-and functions independently of OE or DIR states across the full operating range.

Can 74ALVCH16245GRDR interface directly between 1.8 V and 3.3 V buses without level-shifting components?

Yes-74ALVCH16245GRDR operates natively from 1.65 V to 3.6 V and accepts input voltages from 0 V to VCC. Its VIH/VIL thresholds scale with VCC (e.g., VIH = 0.65×VCC at 1.65 V), enabling direct connection between 1.8 V and 3.3 V domains. When powered at 3.3 V, it correctly interprets 1.8 V logic HIGH as valid; when powered at 1.8 V, its outputs swing to ~1.6 V, sufficient to drive 1.8 V receivers. No external level shifters are required.

What is the maximum capacitive load each output of 74ALVCH16245GRDR can drive while maintaining 3 ns propagation delay?

Each output of 74ALVCH16245GRDR maintains ≤3 ns propagation delay (tpd) driving up to 50 pF total load capacitance at VCC = 3.3 V and TA = 25°C, as specified in the switching characteristics table. This includes PCB trace capacitance, receiver input capacitance, and probe effects. For heavier loads (>50 pF), tpd increases linearly-e.g., 100 pF raises tpd to ~4.5 ns. Layout best practices recommend minimizing stub lengths and using controlled-impedance routing to stay within spec.