Microchip Technology SY100EL05ZC

Overview

SY100EL05ZC from Micrel is a 2-input differential ECL AND/NAND gate with 275 ps typical propagation delay, 225 ps typical output rise/fall time, and internal 75 kΩ input pull-down resistors, operating from –5.2 V VEE supply; used in high-speed logic interfacing and clock distribution in telecom line cards.

For engineers reviewing the SY100EL05ZC datasheet, SY100EL05ZC pinout, SY100EL05ZC application, or SY100EL05ZC equivalent, key selection criteria include differential ECL compatibility, sub-300 ps AC timing, SOIC-8 package constraints, and negative supply operation at –4.2 V to –5.5 V.

Technical Context

The SY100EL05ZC implements true ECL differential logic with complementary Q and Q̅ outputs, supporting both AND/NAND functions via differential input pairing (D0/D1). Its clamp circuitry ensures defined HIGH state under open-input conditions when pulled to VEE.

Designed for negative-supply ECL systems, it operates with VCC = GND and VEE = –4.2 V to –5.5 V, delivering guaranteed AC performance across –40°C to +85°C with minimum 150 mV differential input swing and common-mode range down to VEE + 3.0 V.

Key Specifications

Pinout & Package

SY100EL05ZC is housed in an 8-pin SOIC package (Z8-1, 0.150" wide), lead-finished with Sn-Pb, and rated for commercial temperature range (0°C to +70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential ECL logic gate applications.

Compared with SY10EL05ZC and MC100EL05DTG, the SY100EL05ZC offers optimized propagation delay for commercial-temp telecom clock paths but lacks Pb-free finish and industrial temperature rating - making MC100EL05DTG more suitable for long-lifecycle embedded deployments.

Availability

SY100EL05ZC is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test instrumentation, and optical networking equipment requiring stable component supply with commercial-temperature ECL logic performance.

Supply support for SY100EL05ZC 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

Micrel, Inc. was a U.S.-based semiconductor company specializing in high-performance analog, RF, and timing solutions before its acquisition by Microchip Technology in 2015.

The SY100EL05ZC belongs to Micrel's SY100EL ECL logic family, engineered for ultra-low-skew, high-frequency digital signal routing in telecom and datacom systems where sub-nanosecond timing precision is critical.

FAQ

What is the recommended power supply configuration for SY100EL05ZC?

SY100EL05ZC requires VCC connected to GND and VEE supplied at –4.2 V to –5.5 V. The device draws 18–22 mA from VEE. Decoupling capacitors (e.g., 100 nF ceramic + 10 µF tantalum) must be placed near Pin 4 (VEE) and Pin 3 (VCC/GND) to suppress switching noise. No positive supply is used - VCC is a reference node, not a power rail.

Does SY100EL05ZC support OR/NOR functionality?

Yes - SY100EL05ZC can implement differential OR/NOR by leveraging De Morgan's theorem: a NAND with inverted inputs equals an OR. Its differential inputs and complementary Q/Q̅ outputs allow direct use as an OR/NOR gate when inputs are cross-connected and outputs are interpreted accordingly, without external inverters.

What is the purpose of the internal 75 kΩ pull-down resistors on SY100EL05ZC inputs?

The internal 75 kΩ pull-down resistors on SY100EL05ZC inputs ensure a defined HIGH logic state at the gate input when either D0 or D1 is left unconnected or pulled to VEE. This fail-safe behavior prevents floating-node metastability and maintains functional predictability in partial-interface or hot-swap scenarios.

Can SY100EL05ZC be used with PECL signal levels?

SY100EL05ZC is designed for ECL operation (VEE-referenced), not PECL (VCC-referenced). While its input sensitivity (150 mV min. swing) and output swing align with some PECL receivers, direct PECL interfacing requires level-shifting or termination adjustments - SY100EL05ZC itself does not meet PECL voltage domain specifications.

Is SY100EL05ZC pin-compatible with SY10EL05ZC?

Yes - SY100EL05ZC and SY10EL05ZC share identical SOIC-8 (Z8-1) pinout, terminal functions, and AC timing architecture. The primary difference lies in VEE operating range: SY10EL05ZC supports –4.75 V to –5.5 V, while SY100EL05ZC supports –4.2 V to –5.5 V, making SY100EL05ZC more tolerant of higher VEE (less negative) supplies.