Microchip Technology ZL30631LDG1

Overview

ZL30631LDG1 from Microchip Technology is a carrier-grade, multi-channel clock synchronizer IC with five independent DPLL-based timing channels, supporting up to 10 differential or CMOS inputs and 20 CMOS/differential outputs. It delivers 100 fsRMS typical output jitter at 156.25 MHz (12 kHz–20 MHz), <0.9W core power consumption, and full ITU-T G.8262/G.8262.1 compliance for SyncE and IEEE 1588 systems in wireless base stations and OTN routers.

For engineers reviewing the ZL30631LDG1 datasheet, ZL30631LDG1 pinout, ZL30631LDG1 application, or ZL30631LDG1 equivalent, this device is selected for high-precision telecom timing where hitless reference switching, sub-ps phase adjustment, input-to-output alignment <200 ps, and MiToDSync time-of-day transport are required in central system timing architectures.

Technical Context

The ZL30631LDG1 integrates up to eight DPLLs-five dedicated to clock I/O channels plus NCO-hybrid and split-XO modes-with programmable bandwidth (0.1 mHz–470 Hz), phase-slope limiting, and holdover averaging down to 0.001 Hz filter for <0.01 ppb initial offset. Each DPLL supports 1 ps resolution phase measurement and adjustment, fast lock to 1 Hz inputs (3–60 s), and gapped-clock locking.

Its five synthesizers enable any-to-any frequency conversion (0.5 Hz–750 MHz) with 0 ppm error, supporting LVDS/LVPECL/2xCMOS outputs per pair, per-output duty cycle control, glitchless start/stop, and embedded Sync (1PPS, 2/8 kHz) or MiToDSync/MiToDBasic time-of-day signaling on configurable pins.

Key Specifications

Pinout & Package

Package: 64-lead 9 mm × 9 mm VQFN (0.5 mm pitch), thermally enhanced with exposed E-pad ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel telecom timing applications.

Compared with Si5341-B-GM and ICS8430I-01LG, the ZL30631LDG1 uniquely combines five DPLL channels, MiToDSync time-of-day embedding, <0.01 ppb holdover stability, and full G.8262.1 compliance-making it the sole option for new carrier infrastructure requiring integrated SyncE+1588 timing with deterministic phase alignment and zero-layout rework.

Availability

ZL30631LDG1 is available at Aetrix Electronics and suitable for wireless base stations, Synchronous Ethernet routers, and OTN transport terminals requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for carrier-grade deployments.

Supply support for ZL30631LDG1 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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with leadership in telecom and industrial timing ICs.

The ZL30631LDG1 belongs to Microchip's ZL family of carrier-class clock synchronizers, designed specifically for central timing in SyncE, IEEE 1588, and OTN systems where multi-channel DPLL independence, sub-ps phase control, and embedded time-of-day transport are mandatory.

FAQ

What timing standards does the ZL30631LDG1 comply with?

The ZL30631LDG1 is fully compliant with ITU-T G.8262 (SyncE), G.8262.1 (Enhanced SyncE), G.813 (SDH equipment clocks), G.812 (Primary reference clocks), and Telcordia GR-1244/GR-253. Compliance is verified through on-chip DPLL architecture, programmable bandwidth, and holdover performance down to 0.001 Hz filter settings. The ZL30631LDG1 meets Stratum 3E requirements without external components.

Does the ZL30631LDG1 support both SyncE and IEEE 1588 timing simultaneously?

Yes, the ZL30631LDG1 supports concurrent SyncE and IEEE 1588 operation using dedicated DPLL channels: one DPLL locks to SyncE line input, another processes 1588 control messages (e.g., PTP delay request/response), and a third manages Ref-Sync 1PPS alignment. Its five-channel architecture allows independent configuration per application domain, and the ZL30631LDG1 generates aligned outputs for both protocols without resource contention.

What is the function of MiToDSync on the ZL30631LDG1?

MiToDSync is a 1-wire time-of-day interface on the ZL30631LDG1 that carries frequency, phase, and 48-bit seconds/32-bit nanoseconds timestamps over a single pin. It enables deterministic ToD distribution to downstream devices (e.g., FPGAs, RFICs) with <100 ps alignment to clock edges. Unlike standard UART or SPI ToD, MiToDSync is hardware-synchronized and supported natively by the ZL30631LDG1's internal timing engine without software overhead.

Can the ZL30631LDG1 generate PCIe Gen5 reference clocks?

Yes, the ZL30631LDG1 supports PCIe Gen5 (100 MHz ±300 ppm) via its synthesizers, delivering 100 fsRMS typical jitter at 100 MHz (12 kHz–20 MHz), well within PCIe Gen5 specification (<1.5 ps RMS). Its per-output duty cycle adjustment, glitchless start/stop, and 2xCMOS mode allow simultaneous generation of 100 MHz and auxiliary clocks (e.g., 10 MHz REFCLK) on the same output pair-fully validated for use with Gen5 root complexes and endpoints.

How many independent DPLLs does the ZL30631LDG1 implement?

The ZL30631LDG1 implements up to eight DPLLs: five dedicated to independent clock I/O channels, one configured in NCO-hybrid mode for SyncE assist, and two reserved for split-XO OCXO locking. All eight DPLLs operate concurrently, with individual bandwidth, tracking range, and phase-slope limiting settings. This architecture is confirmed in the DS20006634A datasheet Figure 1-1 block diagram and Section 3.3, and applies specifically to the ZL30631LDG1 ordering variant.