Microchip Technology SY10E445JC

Overview

SY10E445JC from Micrel, Inc. is a 4-bit ECL serial-to-parallel converter with differential clock and data inputs, supporting up to 2.5 Gb/s NRZ data rates, on-chip ÷4 and ÷8 clock outputs, and MODE-selectable 4-bit/8-bit cascaded operation in a 28-pin PLCC package. It serves as a high-speed interface between serial links and parallel bus systems in telecom line cards and test equipment.

For engineers reviewing the SY10E445JC datasheet, SY10E445JC pinout, SY10E445JC application, or SY10E445JC equivalent, key selection considerations include its 2.5 Gb/s conversion capability, differential ECL signaling compliance, internal 75 kΩ input pull-downs, asynchronous SYNC-controlled bit alignment, and compatibility with MC10E/100E445 logic families.

Technical Context

The SY10E445JC implements a synchronous serial-to-parallel conversion pipeline using ECL flip-flops clocked by differential CLK inputs, with dual differential serial inputs (SINA/SINB) selectable via SEL for loopback testing. Its internal ÷4 and ÷8 dividers derive CL/4 and CL/8 outputs directly from the input clock without external components.

Conversion timing is controlled by RESET (asynchronous counter reset), SYNC (asynchronous start-bit shift), and MODE (4-bit vs. cascaded 8-bit configuration). The VBB pin provides a stable reference for single-ended input use below 500 MHz, while differential signaling is required above that threshold.

Key Specifications

Pinout & Package

SY10E445JC is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC, package code J28-1), commercial temperature range (0°C to +85°C), Sn-Pb lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial-to-parallel converter applications.

Compared with MC10E445FN and SY100E445JC, the SY10E445JC offers verified 2.5 Gb/s operation at –4.2 V VEE and matches MC10E445 timing while providing Micrel's extended voltage margin-making it ideal for interoperable ECL systems where legacy and modern supply rails coexist.

Availability

SY10E445JC is available at Aetrix Electronics and suitable for OC-48 demultiplexing, ATE loopback testing, and 8-bit cascaded protocol analysis requiring stable component supply across commercial temperature range.

Supply support for SY10E445JC 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-speed analog, RF, and power management ICs before its acquisition by Microchip Technology in 2015.

The SY10E445JC belongs to Micrel's 10E ECL logic family, designed specifically for high-bandwidth telecom and test equipment requiring sub-nanosecond timing precision and robust differential signaling.

FAQ

What is the maximum guaranteed data rate for SY10E445JC?

The SY10E445JC is guaranteed to operate at up to 2.5 Gb/s NRZ data rate under specified conditions: VEE = –4.2 V to –5.5 V, input clock amplitude 150 mV to 400 mV, and TA = +25°C. This rating is confirmed in the AC Characteristics table of the official datasheet, with fMAX = 2.5 Gb/s listed under "NRZ" condition.

Does SY10E445JC support single-ended input operation?

Yes, SY10E445JC supports single-ended inputs using the VBB pin as a reference. When operating below 500 MHz, VBB (–1.38 V to –1.19 V) is tied to the inverting input and bypassed with a 0.01 µF capacitor. However, differential signaling is mandatory above 500 MHz per the datasheet's Applications Information section.

How does the SYNC input affect timing in SY10E445JC?

The SYNC input in SY10E445JC provides asynchronous bit-shift control: each pulse moves the conversion start point from Qn to Qn–1 by one bit position. As described in Timing Diagram B, this allows real-time alignment of the first serial bit to Q0 without halting the clock or resetting counters-critical for frame synchronization in protocol analyzers.

Can SY10E445JC be used in an 8-bit configuration?

Yes, SY10E445JC supports 8-bit operation when two devices are cascaded. With MODE = HIGH, the first SY10E445JC's SOUT drives the second device's SINA input, and the second device's CL/8 output synchronizes the combined 8-bit word. Maximum frequency drops to ~1.5 GHz using complementary clock routing, as detailed in Figure 4 of the datasheet.

Is SY10E445JC pin-compatible with MC10E445?

Yes, SY10E445JC is fully pin-compatible and functionally equivalent to Motorola's MC10E445, including identical 28-pin PLCC layout, pin functions, and AC/DC specifications. The datasheet explicitly states "Fully compatible with Motorola MC10E/100E445", confirming drop-in replacement capability in legacy designs.