Microchip Technology SY100E445JZ

Overview

SY100E445JZ from Micrel is a 4-bit serial-to-parallel converter IC for high-speed NRZ data streams up to 2.5 Gb/s, featuring differential clock and serial inputs, on-chip ÷4 and ÷8 clock outputs, and MODE-selectable 4-bit/8-bit operation in a 28-pin PLCC package. It serves as a core demultiplexer in telecom and test equipment serial link receivers.

For engineers reviewing the SY100E445JZ datasheet, SY100E445JZ pinout, SY100E445JZ application, or SY100E445JZ equivalent, key selection factors include its 2.5 Gb/s NRZ capability, differential ECL-compatible signaling (–4.2 V to –5.5 V VEE), asynchronous SYNC-controlled bit alignment, and cascaded 8-bit configuration support using dual devices.

Technical Context

The SY100E445JZ implements a synchronous serial-to-parallel conversion pipeline with dual differential serial inputs (SINA/SINB), selectable via SEL, and generates parallel Q0–Q3 outputs synchronized to a differential CLK input. Its internal ÷4 and ÷8 dividers derive CL/4 and CL/8 outputs directly from CLK, enabling system-level clock domain bridging.

Conversion timing is controlled by RESET (asynchronous counter reset), SYNC (asynchronous start-bit shift per pulse), and MODE (4-bit vs. cascaded 8-bit mode). The device supports single-ended use via VBB reference and includes 75 kΩ internal input pull-downs - all compliant with Motorola MC10E/100E445 logic families.

Key Specifications

Pinout & Package

SY100E445JZ is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC) package, J28-1 footprint, Pb-free matte-Sn finish, commercial temperature range (0°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC100E445FN and SY100E445JC, the SY100E445JZ offers identical conversion performance and timing but delivers Pb-free matte-Sn termination in the same PLCC footprint - enabling RoHS-compliant production without layout change or signal integrity compromise.

Availability

SY100E445JZ is available at Aetrix Electronics and suitable for OC-48 receiver demux, high-speed test loopback interfaces, and cascaded 8-bit serial-to-parallel conversion requiring stable component supply and long-term industrial availability.

Supply support for SY100E445JZ 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 timing solutions, acquired by Microchip Technology in 2015.

The SY100E445JZ belongs to Micrel's 100E ECL family, designed specifically for telecom infrastructure and test equipment demanding sub-nanosecond timing precision and multi-gigabit serial interface reliability.

FAQ

What is the maximum guaranteed data rate for SY100E445JZ?

The SY100E445JZ is guaranteed for 2.5 Gb/s NRZ data rate under specified conditions: input clock amplitude 150 mV to 400 mV, VEE = –4.2 V to –5.5 V, and TA = 0°C to +85°C. This rating is confirmed in the AC Characteristics table (Note 2) and applies to standalone 4-bit operation. In cascaded 8-bit mode, the effective limit drops to 1.5 GHz due to propagation delay accumulation.

How does the SYNC input affect timing alignment in SY100E445JZ?

The SYNC input on SY100E445JZ provides asynchronous bit-phase control: each pulse shifts the conversion start bit left by one position (e.g., from Q0 to Q3), effectively rotating the 4-bit window. This occurs without stopping data flow and requires ≥2 input clock cycles per pulse. It is used for real-time jitter compensation and link training - distinct from RESET, which clears all internal state.

Can SY100E445JZ operate with single-ended inputs?

Yes, SY100E445JZ supports single-ended inputs using the VBB pin (–1.38 V typical) as a reference. For single-ended use, tie VBB to the inverting input and bypass with a 0.01 µF capacitor. However, above 500 MHz clock rates, differential signaling is recommended to maintain signal integrity and meet the 2.5 Gb/s specification.

What is the function of the SEL pin on SY100E445JZ?

The SEL pin on SY100E445JZ selects between two differential serial inputs: HIGH routes SINA to the internal converter, LOW routes SINB. This enables loopback testing when paired with the SY100E446 parallel-to-serial converter - SINA includes intentional buffer delay to match round-trip timing, making it the preferred loopback path in test configurations.

Is SY100E445JZ pin-compatible with Motorola MC10E/100E445 devices?

Yes, SY100E445JZ is fully compatible with Motorola MC10E/100E445 devices per the datasheet's "FEATURES" section. It shares identical pinout, electrical specifications, timing behavior, and logic function. The JZ suffix denotes Micrel's Pb-free PLCC packaging, but all signal assignments, DC/AC parameters, and functional operation match the Motorola baseline.