Texas Instruments AM26LV32EIDR

Overview

AM26LV32EIDR from Texas Instruments is a low-voltage, quadruple differential line receiver compliant with TIA/EIA-422-B and ITU V.11 standards. It operates from a single 3.3-V supply, delivers up to 32-MHz switching rates, features ±15-kV IEC ESD protection on bus pins, and provides open-circuit fail-safe outputs. It is used in industrial RS-422 communication links requiring robust noise immunity over long cables.

For engineers reviewing the AM26LV32EIDR datasheet, AM26LV32EIDR pinout, AM26LV32EIDR application, or AM26LV32EIDR equivalent, key selection criteria include its ±7-V common-mode input range, ±200-mV differential sensitivity, 3-state outputs with dual enable logic (G/G̅), Ioff support for partial power-down, and SOIC-16 package compatibility with legacy AM26C32/AM26LS32 designs.

Technical Context

The AM26LV32EIDR implements four independent RS-422 receivers with complementary active-high (G) and active-low (G̅) output enables, enabling flexible bus arbitration and hot-swap capability. Its internal fail-safe circuitry forces high-level outputs during open-circuit conditions, eliminating undefined states on unterminated or disconnected buses.

It supports true 3.3-V operation while accepting 5-V-tolerant enable inputs, and integrates Ioff protection to block back-current during partial power-down. The device maintains ±200-mV differential threshold with 35-mV hysteresis across –40°C to +85°C, ensuring reliable signal detection under EMI-prone industrial conditions.

Key Specifications

Pinout & Package

AM26LV32EIDR is supplied in a 16-pin SOIC (D) package measuring 10.2 mm × 7.8 mm, with standard 1.27-mm pitch and RoHS-compliant NiPdAu lead finish. It is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential line receiver applications.

Compared with SN65LVDS32DR and THVD1450DR, the AM26LV32EIDR uniquely combines RS-422 compliance, open-circuit fail-safe, dual-enable logic, and pin compatibility with legacy TI receivers - making it optimal for upgrading existing industrial bus interfaces without hardware or firmware changes.

Availability

AM26LV32EIDR is available at Aetrix Electronics and suitable for industrial motor drives, smart grid communication nodes, ATM/cash counter interfaces, and automotive diagnostic subsystems requiring stable component supply across extended product lifecycles.

Supply support for AM26LV32EIDR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The AM26LV32EIDR belongs to TI's precision interface IC portfolio, engineered specifically for robust, low-voltage RS-422 communication in electrically noisy, thermally demanding environments - emphasizing reliability, ESD resilience, and drop-in upgrade paths.

FAQ

What is the maximum data rate supported by the AM26LV32EIDR?

The AM26LV32EIDR supports a maximum operating frequency of 32 MHz, corresponding to a theoretical data rate of 64 Mbps for NRZ signaling. This is validated under recommended conditions (VCC = 3.3 V, TA = 25°C) with propagation delays specified from 8 ns to 26 ns. Real-world throughput depends on cable length, termination, and noise margin - TI recommends limiting to 20 Mbps for 1000-m cable runs per application note SLLA123.

Does the AM26LV32EIDR require external termination resistors?

Yes, the AM26LV32EIDR itself does not integrate termination resistors. Per RS-422 specifications, a single 100-Ω to 120-Ω termination resistor must be placed at the far end of the differential pair (typically near the receiver) to prevent signal reflections. TI's application note SLLA123 confirms this requirement and shows measured waveforms with and without termination using AM26LV32EIDR in lab setups.

How does the fail-safe feature of the AM26LV32EIDR behave during an open-circuit condition?

During an open-circuit condition (e.g., broken wire or disconnected bus), the AM26LV32EIDR's internal fail-safe circuitry forces all four outputs (1Y–4Y) to a logic-high state. This is confirmed in the functional table (Section 8.4.1) and description (Section 3), where "Open" input results in "H" output regardless of G/G̅ state - preventing undefined logic levels that could cause downstream MCU misreads or system hangs.

Can the AM26LV32EIDR be used with a 5-V microcontroller's enable signals?

Yes, the AM26LV32EIDR accepts 5-V logic levels on its G and G̅ enable inputs while operating from a 3.3-V VCC supply. Section 1 of the datasheet explicitly states "Accepts 5-V logic inputs with 3.3-V supply (enable inputs)", and electrical characteristics (Section 6.3) specify VIH up to 5.5 V - allowing direct connection to 5-V GPIO without level shifters or pull-up resistors.

What is the purpose of the dual enable inputs (G and G̅) on the AM26LV32EIDR?

The dual enable inputs (G = active-high, G̅ = active-low) provide flexible bus control: asserting either one enables all four receiver outputs, while deasserting both places outputs in high-impedance (tri-state) mode. This allows software-selectable channel activation, hardware-based bus arbitration, or compatibility with both positive- and negative-logic control systems - as detailed in the function table (Table 8-1) and Feature Description (Section 8.3.3).