Texas Instruments SN74ALVCHR162409DL

Overview

SN74ALVCHR162409DL from Texas Instruments is a 9-bit, 4-port universal bus exchanger IC designed for synchronous bidirectional data exchange between four independent buses in 1.65-V to 3.6-V systems. It features 3-state outputs with integrated 26-Ω series resistors on B-port pins, bus-hold circuitry on all data inputs, and glitch-free data-flow control via five select lines (SEL0–SEL4) and clocked state storage. It operates across –40°C to 85°C and is used in high-density logic interconnects requiring dynamic port routing.

For engineers reviewing the SN74ALVCHR162409DL datasheet, SN74ALVCHR162409DL pinout, SN74ALVCHR162409DL application, or SN74ALVCHR162409DL equivalent, this device supports precise timing-critical bus arbitration, eliminates external pullup/pulldown resistors, enables immediate output disable via PRE, and delivers deterministic data flow selection without metastability risk under valid setup/hold conditions.

Technical Context

The SN74ALVCHR162409DL implements UBE (Universal Bus Exchanger) architecture with dual-stage control: SELEN low latches the SEL0–SEL4 state on CLK rising edge to define data path; SELEN high holds the current path unchanged. Its EPIC submicron CMOS process ensures fast propagation delay (tpd ≤ 7 ns at 3.3 V) and low power consumption (ICC ≤ 40 µA).

All 36 I/O pins are divided into four 9-bit ports (1A/2A/1B/2B), with B-port outputs incorporating on-die 26-Ω series termination to suppress overshoot/undershoot. Bus-hold circuitry maintains valid logic levels on floating A/B data inputs, eliminating external biasing components while meeting JESD 17 latch-up (>250 mA) and MIL-STD-883 ESD (>2000 V HBM) requirements.

Key Specifications

Pinout & Package

SN74ALVCHR162409DL uses a 56-pin plastic shrink small-outline (DL) package with 300-mil body width and 0.025-inch lead pitch. Thermal resistance θJA is 74°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCHR162409DL, SN74ALVCH162409DL sacrifices bus-hold convenience for lower unit cost, while SN74LVC16240ADGGR abandons UBE functionality entirely-making SN74ALVCHR162409DL uniquely suited for systems demanding both dynamic routing and input stability without external components.

Availability

SN74ALVCHR162409DL is available at Aetrix Electronics and suitable for high-density backplane interconnects, multi-processor memory arbitration, and hot-swappable I/O module hubs requiring stable component supply across extended product lifecycles.

Supply support for SN74ALVCHR162409DL 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 SN74ALVCHR162409DL belongs to TI's Widebus+™ family of advanced bus interface devices, engineered specifically for low-voltage, high-speed, multi-port synchronous data exchange in industrial and communications infrastructure.

FAQ

What is the primary function of the SN74ALVCHR162409DL?

The SN74ALVCHR162409DL is a 9-bit, 4-port universal bus exchanger that enables synchronous, bidirectional data exchange between four independent buses. It uses five select lines (SEL0–SEL4) and a clock input to configure one of 32 possible data paths-including cross-port transfers like 1A↔2B or 1B↔2A-while maintaining glitch-free operation and deterministic timing behavior in 1.65-V to 3.6-V systems.

How does the PRE pin affect SN74ALVCHR162409DL operation?

The PRE (Preset) pin on the SN74ALVCHR162409DL provides asynchronous, clock-independent control: when driven high, it forces all outputs into high-impedance state immediately-regardless of CLK or SELEN status. This feature is essential for safe hot-swap operations, power-down sequencing, and fault containment, and TI recommends tying PRE to VCC via a pullup resistor during power-up to ensure default high-Z behavior.

Does SN74ALVCHR162409DL require external pullup or pulldown resistors?

No, the SN74ALVCHR162409DL integrates active bus-hold circuitry on all data inputs (1A1–1A9, 2A1–2A9, 1B1–1B9, 2B1–2B9), which maintains valid logic levels on floating or unused lines without external components. This eliminates the need for discrete pullup/pulldown resistors and simplifies PCB layout, especially in high-pin-count interconnect applications.

What is the significance of the 26-Ω series resistors on the B-port outputs of SN74ALVCHR162409DL?

The SN74ALVCHR162409DL incorporates 26-Ω series resistors on all B-port output pins (1B1–1B9, 2B1–2B9) to dampen signal reflections and suppress overshoot/undershoot in high-speed traces. This internal termination removes the need for external resistors, improves signal integrity on longer PCB runs, and reduces EMI-particularly beneficial in compact, densely routed industrial control boards.

Can SN74ALVCHR162409DL operate reliably at 1.65 V supply voltage?

Yes, the SN74ALVCHR162409DL is fully characterized for operation from 1.65 V to 3.6 V. At 1.65 V, it guarantees VIH ≥ 1.07 V, VIL ≤ 0.58 V, and supports up to 120 MHz clock frequency with verified timing margins (tsu = 1.9 ns, th = 0.8 ns). Its EPIC submicron CMOS process ensures stable performance across the full voltage range, making it suitable for ultra-low-power portable and battery-operated systems.