Diodes Incorporated PI90LV179WEX

Overview

PI90LV179WEX from Pericom Semiconductor is a 3.3V LVDS differential line transceiver compliant with IEEE 1596.3 SCI and ANSI/TIA/EIA-644 standards, integrating one driver and one receiver in an 8-pin SOIC package. It delivers ±350mV differential output swing into 100Ω, 1.5ns (driver) / 3.3ns (receiver) typical propagation delay, and supports >660 Mbps signaling over controlled-impedance PCB traces or cables in telecom and datacom systems.

For engineers reviewing the PI90LV179WEX datasheet, PI90LV179WEX pinout, PI90LV179WEX application, or PI90LV179WEX equivalent, key selection criteria include differential input threshold (±50 mV min), fail-safe operation (open/short/terminated), 3.3V single-supply operation, industrial temperature range (–40°C to +85°C), and ESD robustness (2 kV HBM).

Technical Context

The PI90LV179WEX implements a full-duplex LVDS transceiver architecture: the driver accepts LVTTL/CMOS inputs (5V-tolerant DIN) and generates low-noise ±350mV differential outputs (DOUT+, DOUT–); the receiver accepts ≥±50mV differential inputs (RIN+, RIN–) with up to 2.0V ground potential difference and produces 3V CMOS-level TTL outputs (ROUT).

It features integrated fail-safe biasing for open, shorted, or unterminated inputs, ensuring defined logic states at ROUT without external termination. Propagation delays are tightly matched (tsk(p) ≤ 500 ps driver, ≤ 270 ps receiver), enabling precise timing in high-speed point-to-point and multidrop baseband links.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (W), 150 mil wide, Pb-free and RoHS-compliant (E suffix). Pin pitch: 1.27 mm. Body dimensions: 5.0 × 6.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LVDS179DR and MAX9121ESA+, the PI90LV179WEX uniquely combines 5V-tolerant DIN, fail-safe receiver, and best-in-class 1.5/3.3 ns propagation delays - making it optimal for industrial and telecom designs demanding robustness and timing precision.

Availability

PI90LV179WEX is available at Aetrix Electronics and suitable for telecom base stations, data center routers, and industrial imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PI90LV179WEX 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-speed interface ICs, clock management, and signal integrity solutions for datacom, telecom, and computing markets.

The PI90LV179 belongs to Pericom's LVDS transceiver product line, engineered specifically for noise-immune, high-bandwidth point-to-point and multidrop interconnects in infrastructure equipment.

FAQ

Is PI90LV179WEX pin-compatible with PI90LV179WE?

Yes. The 'X' suffix denotes tape-and-reel packaging only; electrical characteristics, pinout, and mechanical footprint are identical between PI90LV179WEX and PI90LV179WE. Both use the same 8-pin SOIC (W) package with 150 mil width and standard pin assignments.

Does PI90LV179WEX require external termination resistors?

No. The driver is designed to drive a 100 Ω differential load, and the receiver includes internal fail-safe biasing. External 100 Ω termination is required at the receiver end of the transmission line, but no pull-up/down resistors are needed on RIN+/RIN– due to integrated fail-safe circuitry.

What is the maximum supported data rate for PI90LV179WEX?

The device supports signaling rates exceeding 660 Mbps (330 MHz clock frequency), verified by propagation delay (1.5 ns driver, 3.3 ns receiver), rise/fall times (<1.5 ns), and LVDS compliance per ANSI/TIA/EIA-644. Actual achievable rate depends on PCB layout, termination quality, and jitter budget.

Can PI90LV179WEX operate with a 2.5V supply?

No. The datasheet specifies a recommended supply range of 3.0 V to 3.6 V (3.3 V ±10%). Operation below 3.0 V is outside specification and may result in undefined output levels, increased propagation delay, or failure to meet LVDS differential swing requirements.