onsemi MC100E142FNR2

Overview

MC100E142FNR2 from ON Semiconductor is a 9-bit ECL shift register optimized for byte-parity applications, supporting serial/parallel-in and serial/parallel-out operation with dual clock inputs (CLK1/CLK2), asynchronous master reset (MR), and 700 MHz minimum shift frequency. It operates in PECL mode (VCC = 4.2–5.7 V, VEE = 0 V) or NECL mode (VCC = 0 V, VEE = −4.2 to −5.7 V), and features internal 50 kΩ pulldown resistors on all inputs.

For engineers reviewing the MC100E142FNR2 datasheet, pinout, applications, or equivalent options, key selection considerations include its ECL-compatible timing performance, dual-clock synchronous shifting, byte-width data handling, and support for high-speed telecom/datacom clock domain alignment and parity generation circuits.

Technical Context

The MC100E142FNR2 implements a unidirectional 9-bit shift register with mode-select control (SEL) toggling between LOAD (parallel data capture) and SHIFT (serial propagation from D0→Q0→Q1→…→Q8). Data latching occurs on the positive edge of either CLK1 or CLK2, with setup/hold times specified down to 50 ps (tS) and 75 ps (tH) for D inputs.

It uses ECL differential logic architecture with temperature-compensated 100-series design, enabling stable operation from 0°C to +85°C. All Q outputs are unterminatable during shift operation, and unused outputs require no termination-reducing board-level noise and power consumption without compromising functionality.

Key Specifications

Pinout & Package

MC100E142FNR2 is housed in a 28-pin PLCC (Plastic Leaded Chip Carrier) package, case 776, with lead pitch of 1.27 mm and body size 11.43 mm × 11.43 mm × 3.56 mm (max height). All VCC and VCCO pins are internally tied; external connection to power supply is mandatory for reliable operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit ECL shift register applications.

Compared with MC10E142FNR2 and MC100E156FN, the MC100E142FNR2 uniquely balances 9-bit precision, full industrial temperature range (0°C to +85°C), and proven ECL interoperability-making it optimal for new designs demanding reliability without over-engineering.

Availability

MC100E142FNR2 is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test instrumentation, aerospace data acquisition, and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC100E142FNR2 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

ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, cloud, and communications markets.

The MC100E142FNR2 belongs to the ECLinPS™ 100-series family, engineered specifically for high-speed, low-jitter ECL logic applications in telecom infrastructure, test equipment, and military/aerospace systems where timing integrity and thermal stability are paramount.

FAQ

What is the maximum operating temperature for MC100E142FNR2?

The MC100E142FNR2 is rated for operation from 0°C to +85°C ambient temperature. This industrial-grade range is enabled by its 100-series temperature-compensated ECL design, distinguishing it from the 10E-series variant (0°C to +75°C). The device meets this specification under airflow ≥500 lfpm and proper power supply decoupling per Application Note AND8020/D.

Does MC100E142FNR2 support both PECL and NECL signaling modes?

Yes, MC100E142FNR2 supports dual-mode operation: PECL mode with VCC = 4.2–5.7 V and VEE = 0 V, and NECL mode with VCC = 0 V and VEE = −4.2 to −5.7 V. Input/output voltage levels scale accordingly-e.g., VOH = ~4.1 V (PECL) or −0.88 V (NECL)-and termination must follow AN8020/D guidelines using 50 Ω to VCC − 2.0 V.

Can unused Q outputs on MC100E142FNR2 be left floating?

Yes, unused Q outputs on MC100E142FNR2 may be left unterminated without affecting shift operation or signal integrity. This design feature reduces PCB routing complexity and eliminates stub reflections. However, for best noise immunity in mixed-signal environments, grounding unused outputs via 50 Ω is still recommended per AN8020/D.

What is the function of the SEL pin on MC100E142FNR2?

The SEL (Select) pin on MC100E142FNR2 controls functional mode: logic LOW selects LOAD mode (parallel data D0–D8 captured on clock edge), and logic HIGH selects SHIFT mode (serial data from S-IN propagates through Q0–Q8). SEL is ECL-compatible and must be driven within valid VIH/VIL windows per Tables 4–7.

Is MC100E142FNR2 RoHS compliant and lead-free?

Yes, MC100E142FNR2 is available in a Pb-free (RoHS-compliant) version denoted by the "G" suffix (e.g., MC100E142FNR2G). The standard MC100E142FNR2 is leaded; both versions share identical electrical specifications and PLCC-28 packaging. Moisture sensitivity level is Level 3 for Pb-free units per J-STD-020.