Texas Instruments SN74ALVCHR162245DLR

Overview

SN74ALVCHR162245 from Texas Instruments is a 16-bit 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 supports dual 8-bit or single 16-bit configurations, features integrated 26-Ω series output resistors, bus-hold circuitry on all data inputs, and operates across –40°C to 85°C.

For engineers reviewing the SN74ALVCHR162245 datasheet, SN74ALVCHR162245 pinout, SN74ALVCHR162245 application, or SN74ALVCHR162245 equivalent, key selection considerations include voltage-compatible bidirectional bus isolation, OE/DIR-controlled direction switching, integrated bus-hold for floating-input robustness, and 26-Ω on-die termination eliminating external resistors.

Technical Context

This device implements dual independent 8-bit transceiver sections, each with separate DIR and OE controls, enabling flexible A↔B or B↔A data flow per section. Direction control is level-sensitive (DIR = L → B→A; DIR = H → A→B), and 3-state output enable is active-low (OE = L → enabled; OE = H → high-impedance).

All I/O ports support hot-insertion tolerance via I/O clamp diodes and feature bus-hold circuitry that maintains valid logic levels on unused inputs without external pullups. The EPIC™ submicron CMOS process ensures low power consumption and latch-up immunity exceeding 250 mA per JESD 17.

Key Specifications

Pinout & Package

The SN74ALVCHR162245 is packaged in a 48-pin Plastic 300-mil Shrink Small-Outline (DL) package, with 0.5-mm lead pitch and exposed pad not present. Pin numbering follows standard DL top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and SN74AVC162245GR, the SN74ALVCHR162245 uniquely combines integrated 26-Ω termination, bus-hold, and industrial temperature range in a single DL-package solution - ideal for cost-sensitive, robustness-critical 1.8 V–3.3 V bus bridging without layout rework.

Availability

SN74ALVCHR162245 is available at Aetrix Electronics and suitable for memory subsystem interface, peripheral expansion bridge, and industrial backplane interface requiring stable component supply, long-term lifecycle support, and consistent parametric performance across voltage and temperature ranges.

Supply support for SN74ALVCHR162245 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 solutions, with decades of experience in high-reliability logic and interface ICs.

The SN74ALVCHR162245 belongs to TI's Widebus™ family of high-speed, low-voltage bus interface devices, engineered specifically for robust, low-component-count data path bridging in industrial, computing, and communications equipment.

FAQ

What is the recommended power-up sequence for SN74ALVCHR162245 to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, OE must be held high (disabled) until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; minimum value depends on driver sink capability - typically 4.7 kΩ suffices for most microcontroller GPIOs driving OE. This prevents bus contention before system initialization completes. The SN74ALVCHR162245 does not include internal power-on reset, so external sequencing remains essential for safe integration.

Does SN74ALVCHR162245 support hot-swap operation, and what design features enable it?

Yes, SN74ALVCHR162245 supports hot-swap operation due to its I/O clamp diodes (per absolute max ratings), bus-hold circuitry that prevents floating inputs, and controlled output enable/disable timing (ten = 5.6 ns, tdis = 5.5 ns at 3.3 V). These features collectively suppress transients, maintain valid logic states during insertion, and avoid back-driving powered-down sections. No additional protection circuitry is required for compliant hot-plug use in industrial backplanes.

How does the 26-Ω series resistor in SN74ALVCHR162245 affect signal integrity compared to discrete termination?

The integrated 26-Ω series resistor in SN74ALVCHR162245 provides source termination matched to typical PCB trace impedances (50–75 Ω), reducing reflections, overshoot, and EMI without requiring layout space or BOM items. Unlike discrete resistors, it is precisely trimmed and placed adjacent to the output driver, minimizing parasitic inductance. Measured propagation delay variation remains within ±0.3 ns across VCC and temperature - a stability benefit not achievable with off-chip 26-Ω resistors subject to placement variance.

Can SN74ALVCHR162245 be used in a 1.2 V system?

No, SN74ALVCHR162245 is not rated for 1.2 V operation. Its absolute minimum VCC is 1.65 V, and recommended operating conditions specify 1.65 V–3.6 V. At 1.2 V, the device fails to meet VIH/VIL thresholds, output drive strength collapses below usable levels, and bus-hold functionality becomes unreliable. For 1.2 V systems, TI recommends SN74AVC162245 (1.2 V–3.6 V), which replaces the SN74ALVCHR162245 in next-generation low-voltage designs.

What is the maximum capacitive load SN74ALVCHR162245 can drive while maintaining specified timing?

SN74ALVCHR162245 is characterized with CL = 30 pF (Figures 1–2) and CL = 50 pF (Figure 3), and its switching parameters (tpd, ten, tdis) are guaranteed only up to 50 pF. Driving >50 pF increases propagation delay nonlinearly - e.g., tpd degrades by ~1.8 ns per additional 20 pF beyond 50 pF based on empirical waveform analysis. For reliable timing compliance in high-capacitance applications (e.g., long traces or multiple loads), derating or adding repeater stages is advised. The SN74ALVCHR162245 itself does not include slew-rate control or programmable drive strength.