Microchip Technology SY100EL01ZG

Overview

SY100EL01ZG from Micrel is an industrial-grade 4-input ECL OR/NOR gate with 230 ps typical propagation delay, 225 ps typical output rise/fall time (20%–80%), and internal 75 kΩ input pull-down resistors. It operates from –4.2 V to –5.5 V V_EE with V_CC = GND and is used in high-speed clock distribution, logic arbitration, and data path merging in telecom line cards.

For engineers reviewing the SY100EL01ZG datasheet, SY100EL01ZG pinout, SY100EL01ZG application, or SY100EL01ZG equivalent, key selection criteria include ECL-compatible input thresholds, dual-output OR/NOR functionality, Pb-free SOIC-8 packaging, industrial temperature range (–40°C to +85°C), and guaranteed AC performance across full operating voltage and temperature extremes.

Technical Context

The SY100EL01ZG implements true ECL logic with differential output structure-Q and Q̅ outputs are complementary and internally generated. Its design uses emitter-coupled transistors biased by a dedicated V_EE supply, enabling rail-to-rail swing and sub-nanosecond timing precision without external termination resistors.

It supports wired-OR expansion via open-emitter-compatible outputs when used with external pull-downs, and its 75 kΩ internal input pull-downs ensure defined logic states during floating or unconnected inputs-critical for robust operation in backplane and hot-swap environments.

Key Specifications

Pinout & Package

SY100EL01ZG is housed in an 8-pin SOIC (Z8-1) package with gull-wing leads, 1.27 mm pitch, and Pb-free NiPdAu plating. The package meets JEDEC MS-012 and is rated for reflow per IPC/JEDEC J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ECL OR/NOR gate applications.

Compared with MC100EL01DTG and SN65ELT22DR, SY100EL01ZG uniquely delivers ECL-speed OR/NOR logic with integrated input biasing and industrial-temperature Pb-free packaging-enabling drop-in replacement in legacy Micrel/Motorola ECL designs while reducing layout complexity and improving thermal reliability.

Availability

SY100EL01ZG is available at Aetrix Electronics and suitable for telecom infrastructure, RF transceiver control, high-speed data acquisition, and industrial timing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SY100EL01ZG 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 analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in high-performance timing, power management, and interface ICs.

The SY100EL01ZG belongs to Micrel's SY100EL family of ultra-high-speed ECL logic devices, designed specifically for low-skew, high-fanout clock and data distribution in telecom, test equipment, and military/aerospace systems.

FAQ

What is the recommended power supply configuration for SY100EL01ZG?

The SY100EL01ZG requires a negative V_EE supply between –4.2 V and –5.5 V, with V_CC tied directly to system ground. Decoupling capacitors (0.1 µF ceramic + 10 µF tantalum) must be placed within 5 mm of pins 5 (V_CC) and 7 (V_EE). This configuration ensures stable ECL switching margins and minimizes ground bounce in multi-gate arrays. SY100EL01ZG does not support positive-supply operation.

Does SY100EL01ZG support wired-OR connections?

Yes, SY100EL01ZG supports wired-OR expansion when used with external 50 Ω pull-down resistors on the Q outputs. Its open-emitter-compatible outputs allow multiple gates to share a common bus without contention. However, internal input pull-downs remain active, so unused D0–D3 inputs require no external termination. SY100EL01ZG's output voltage swing remains compliant under wired-OR loading up to 3 loads.

What is the function of the Q and Q̅ outputs on SY100EL01ZG?

On SY100EL01ZG, the Q pin provides the OR function (Q = D0 + D1 + D2 + D3 in negative logic), while Q̅ provides the complementary NOR function (Q̅ = NOT(D0 + D1 + D2 + D3)). Both outputs are actively driven, fully buffered, and electrically matched-enabling simultaneous use without added inversion delay. This dual-output architecture makes SY100EL01ZG ideal for synchronous enable/disable control in high-speed systems.

Is SY100EL01ZG pin-compatible with SY10EL01ZG?

Yes, SY100EL01ZG is pin-compatible with SY10EL01ZG-both use identical Z8-1 SOIC-8 packaging and share identical pin assignments (D0–D3, V_CC, Q, V_EE, Q̅). However, SY100EL01ZG offers improved AC performance (230 ps vs. 270 ps t_PD) and wider V_EE tolerance (–4.2 V to –5.5 V vs. –4.75 V to –5.5 V), making SY100EL01ZG a direct upgrade path in industrial designs.

How does the internal 75 kΩ pull-down affect unused inputs on SY100EL01ZG?

The internal 75 kΩ pull-down resistors on SY100EL01ZG bias each D0–D3 input to V_EE when left unconnected, ensuring a defined LOW state and preventing metastability or oscillation. This eliminates the need for external pull-down resistors in partial-population scenarios-such as modular backplanes where some slots remain empty. SY100EL01ZG maintains full AC specifications even with all inputs pulled down internally.