Microchip Technology SY10E445JZ

Overview

SY10E445JZ from Micrel is a 4-bit ECL serial-to-parallel converter with differential clock and data inputs, supporting NRZ data rates up to 2.5 Gb/s, generating ÷4 and ÷8 differential clock outputs, and operating over –4.2 V to –5.5 V VEE. 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 SY10E445JZ datasheet, SY10E445JZ pinout, SY10E445JZ application, or SY10E445JZ equivalent, key selection considerations include its 2.5 Gb/s NRZ capability, dual differential serial inputs (SINA/SINB), MODE-selectable 4-/8-bit conversion, asynchronous SYNC control for bit alignment, and PLCC-28 packaging with ECL-compatible voltage levels.

Technical Context

The SY10E445JZ implements a synchronous 4-bit shift register with differential ECL logic, using internal ÷2 and ÷4 dividers to generate CL/4 and CL/8 outputs. Its serial input select (SEL) enables loopback testing when paired with SY10E446, and the SYNC input provides asynchronous bit-phase adjustment by swallowing clock cycles.

Conversion mode is controlled by the MODE pin: low (or open) configures 4-bit operation at full 2.5 Gb/s; high enables cascaded 8-bit operation using two devices, with timing constrained by tPD(CLK→SOUT) + tS(SIN) ≤ clock period - limiting max frequency to ~950 MHz without clock skewing, or up to 1.5 GHz when using complementary CLK inputs.

Key Specifications

Pinout & Package

SY10E445JZ is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC-28, package code J28-1), with lead finish matte-Sn per RoHS requirements. Pin 1 is located at the corner with the bar-line indicator; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SY10E445JZ, SY100E445JZ offers enhanced voltage margin and noise rejection at identical speed and pinout, while MC100E445FN provides legacy compatibility but lacks Pb-free compliance - making SY10E445JZ the optimal balance of performance, RoHS readiness, and design flexibility for new high-speed serial interface implementations.

Availability

SY10E445JZ is available at Aetrix Electronics and suitable for telecom infrastructure, automated test equipment, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for SY10E445JZ 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 acquired by Microchip Technology in 2015, known for high-performance ECL, PECL, and LVDS interface ICs.

The SY10E445JZ belongs to Micrel's 10E ECL logic family, designed specifically for ultra-high-speed serial data demultiplexing in telecom, test, and military/aerospace applications demanding sub-nanosecond timing precision.

FAQ

What is the maximum guaranteed data rate for SY10E445JZ?

The SY10E445JZ is guaranteed to operate at 2.5 Gb/s NRZ under specified conditions: VEE = –4.2 V to –5.5 V, input clock amplitude 150–400 mVpp, and TA = 0°C to +85°C. This rating applies strictly to 4-bit mode; cascaded 8-bit operation reduces max frequency to 950 MHz (or 1.5 GHz with clock skewing). The 2.5 Gb/s figure is validated per AC Characteristic Table footnote 2 in the official Micrel datasheet.

Does SY10E445JZ support single-ended inputs?

Yes, SY10E445JZ supports single-ended inputs via its VBB pin, which provides a –1.38 V reference for the input differential amplifier. For single-ended use, tie VBB to the inverting input and bypass it with a 0.01 µF capacitor. However, differential signaling is recommended above 500 MHz to maintain signal integrity - the device's 2.5 Gb/s rating assumes differential operation per datasheet AC specifications.

How does the MODE pin affect SY10E445JZ functionality?

The MODE pin configures SY10E445JZ for either 4-bit or 8-bit operation: LOW (or open) selects standard 4-bit conversion at full 2.5 Gb/s; HIGH enables cascaded 8-bit mode using two SY10E445JZ devices. In 8-bit mode, the first device's SOUT drives the second device's SIN input, and CL/8 from the second device synchronizes the full 8-bit output - but timing constraints reduce max frequency unless clock skewing is applied.

Can SY10E445JZ be used in a loopback test configuration?

Yes, SY10E445JZ supports hardware loopback testing via its dual serial inputs (SINA and SINB) and SEL pin. When paired with SY10E446, SINA's intentional buffer delay allows precise alignment of transmitted and received data edges. SEL selects which input feeds the internal register, enabling closed-loop validation without external cabling or signal generators - a feature explicitly documented in the Applications Information section of the Micrel datasheet.

What is the purpose of the SYNC input on SY10E445JZ?

The SYNC input on SY10E445JZ provides asynchronous bit-phase adjustment: each pulse (≥2 clock cycles wide) shifts the conversion start point left by one bit (e.g., Dn → Dn−1 at Q0). This "bit swallowing" mechanism allows real-time alignment of parallel outputs to incoming data eye position without resetting counters or halting data flow - a capability confirmed in Timing Diagram B and described in the Functional Description section of the datasheet.