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Microchip Technology ZL30681LFG7
- Part No.:
- ZL30681LFG7
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Clock/Timing
- Package:
- 80-VFLGA
- Datasheet:
-
ZL30681LFG7.pdf
- Description:
- SINGLE CHANNEL SYNCE LINE CARD
- Quantity:
- Payment:
- Shipping:
Inventory:1,523
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Product details
Overview
ZL30681LFG7 from Microsemi is a single-channel Line Card Timing IC designed for carrier-grade synchronization in Synchronous Ethernet and IEEE 1588 systems. It integrates one DPLL with programmable bandwidth (14–470 Hz), supports up to 10 input clocks (1 kHz–900 MHz), delivers 18 low-jitter outputs (≤0.3 ps RMS from Synth1/2 integer dividers), and operates across –40°C to +85°C in an 80-lead 11×11 mm LGA package.
For engineers reviewing the ZL30681LFG7 datasheet, ZL30681LFG7 pinout, ZL30681LFG7 application, or ZL30681LFG7 equivalent, this device serves as a high-precision timing solution requiring hitless reference switching, sub-picosecond phase resolution (1 ps), REF+SYNC locking, and fractional frequency synthesis with 0 ppm error for telecom line cards.
Technical Context
The ZL30681LFG7 implements a numerically controlled oscillator (NCO)-based DPLL architecture with automatic freerun/holdover/tracking state transitions, internal 1 ppt compensation for XO frequency error, and per-input/per-DPLL phase measurement at 1 ps resolution. Its dual low-jitter synthesizers (Synth1, Synth2) each combine integer and 40-bit fractional dividers to generate five independent frequency families.
Input monitoring includes coarse/fine/frequency-step detection, single-cycle invalidation, and optional GPIO-triggered clock invalidation. Output flexibility covers LVDS/LVPECL/HCSL/HSTL/2×CMOS modes per HPOUT pair, with per-output glitchless enable/disable, duty cycle control, and phase alignment <200 ps using external feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPLL Channels | 1-channel DPLL with programmable bandwidth (14–470 Hz) and hitless reference switching |
| Input Support | Up to 10 differential or CMOS inputs; any frequency from 1 kHz to 900 MHz (180 MHz max for CMOS) |
| Output Count & Type | 18 total outputs: up to 8 differential (HPOUTxP/N) + 2 CMOS (GPOUT0/1); supports LVDS, LVPECL, HCSL, HSTL, 2×CMOS |
| Jitter Performance | <0.3 ps RMS jitter from Synth1/Synth2 integer dividers; <1 ps RMS from fractional dividers (many <0.5 ps RMS) |
| Phase Resolution | 1 ps resolution for per-input, per-DPLL, per-synthesizer, and per-output phase adjustment |
| Local Oscillator | Supports single XO (23.75–25 MHz, 47.5–50 MHz, or 114.285–125 MHz); optional TCXO/OCXO on REF pin for stability reference |
| Package | 80-lead LGA, 11 × 11 mm, NiAu (Pb-free), –40°C to +85°C operating range |
Pinout & Package
Package: 80-lead LGA, 11 × 11 mm body, 0.5 mm pitch, 16-exposed pad (EP), NiAu finish, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF0P–REF4P/N | Differential or single-ended reference inputs | Accept up to 10 total inputs; any can serve as 1PPS SYNC for REF+SYNC locking |
| HPOUT0P–HPOUT7P/N | High-performance output pairs | Configurable as LVDS/LVPECL/HCSL/HSTL/2×CMOS; each P/N pair supports independent frequencies in 2×CMOS mode |
| GPOUT0/GPOUT1 | General-purpose CMOS outputs | From Synth0; 1 Hz–180 MHz; jitter ~20–30 ps RMS; suitable for central timing ICs or low-bandwidth receivers |
| OSCI/OSCO | Oscillator input/output | Connects to external XO (23.75–125 MHz); optional TCXO/OCXO for stability reference on REF pins |
| SCK_SCL, SO_ASEL1, SI_SDA | SPI/I²C interface | Configurable serial interface for register access and configuration script loading |
| GPIO[6:0] | General-purpose I/O | 7 pins supporting status reporting, clock invalidation, or control functions per system requirement |
Key Features
| Feature | Design Value |
|---|---|
| Hitless reference switching | Enables seamless failover between input references without output glitches or phase discontinuity |
| Fractional frequency synthesis | Delivers any-to-any output frequency (1 Hz–1045 MHz) with 0 ppm error via 40-bit fractional dividers |
| REF+SYNC locking | Simultaneously locks frequency and 1PPS phase to low-cost XO, reducing need for high-stability oscillators |
| Per-output glitchless start/stop | Allows dynamic enable/disable of individual outputs with stop-high or stop-low behavior, no transient spikes |
| Input-to-output alignment | Sub-200 ps alignment achievable using external feedback path, critical for JESD204B and precise timing systems |
Applications
| Synchronous Ethernet Line Card | IEEE 1588 Boundary Clock |
|---|---|
|
Use Scenario: Timing recovery and distribution on telecom line cards interfacing with PHYs and switch fabric. IC Role / Device Role / Timing Role: Primary DPLL-based clock recovery IC providing 156.25 MHz, 125 MHz, and 25 MHz differential outputs to Ethernet PHYs and MACs. Use Value: Enables SyncE compliance with <200 ps input-to-output alignment and hitless switchover during reference loss. |
Use Scenario: Boundary clock implementation in packet-switched networks requiring precise time-of-day synchronization. IC Role / Device Role / Timing Role: Generates IEEE 1588-compliant 1PPS output and aligns phase/frequency to grandmaster via REF+SYNC locking. Use Value: Achieves sub-nanosecond phase measurement resolution (1 ps) and fast lock to low-cost XO, lowering BOM cost. |
| OTN/SONET Timing Distribution | Wireless Base Station Timing |
|
Use Scenario: Centralized timing generation for OTN multiplexers and SONET add-drop multiplexers. IC Role / Device Role / Timing Role: Produces 8 kHz, 2 kHz, and 19.44 MHz clocks with embedded PPS (ePPS) for frame alignment and network synchronization. Use Value: Supports legacy PDH/SDH frequencies while enabling modern OTN transport with programmable tracking range and phase-slope limiting. |
Use Scenario: Radio unit (RU) and distributed unit (DU) timing in 4G/5G base stations with fronthaul/backhaul interfaces. IC Role / Device Role / Timing Role: Provides low-jitter (<0.3 ps RMS) clocks for ADC/DAC, FPGA, and RF transceivers; supports JESD204B device clock and SYSREF. Use Value: Fractional synthesis enables exact LTE/5G channel raster frequencies (e.g., 161.1328125 MHz) with zero ppm error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line card timing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5341-B-GM | 4-output, multi-synth architecture; no integrated DPLL; relies on external timing controller for holdover | Lacks native REF+SYNC locking and hitless switching; requires external processor for state management | Preferred when system already uses SiTime timing ecosystem and external DPLL control is acceptable |
| ICS843002AGI-01LFT | Single DPLL, 10 inputs, 12 outputs; max output jitter 0.5 ps RMS; no fractional synthesis; 125 MHz CMOS input limit | Lower frequency range (≤125 MHz CMOS), no 1PPS SYNC support, no per-output phase adjust | Selected for cost-sensitive SDH/SONET cards where 1588 and fractional synthesis are not required |
Compared with Si5341-B-GM and ICS843002AGI-01LFT, the ZL30681LFG7 uniquely integrates full DPLL autonomy, REF+SYNC locking, 1 ps phase resolution, and 0 ppm fractional synthesis-enabling standalone carrier-grade timing without external timing controllers or complex firmware.
Availability
ZL30681LFG7 is available at Aetrix Electronics and suitable for Synchronous Ethernet line cards, IEEE 1588 boundary clocks, and OTN/SONET timing distribution systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ZL30681LFG7 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
Microsemi (now part of Microchip Technology) designs high-reliability timing, power, and RF solutions for aerospace, defense, communications, and industrial markets.
The ZL30681LFG7 belongs to Microsemi's Line Card Timing IC product line, engineered specifically for carrier-grade synchronization in telecom infrastructure requiring autonomous DPLL operation, sub-picosecond phase control, and multi-standard compliance (SyncE, 1588, OTN, SONET).
FAQ
What is the maximum number of input clocks supported by the ZL30681LFG7?
The ZL30681LFG7 supports up to 10 differential or CMOS input clocks, with any input configurable as a 1PPS SYNC signal for REF+SYNC frequency and phase locking. Each input accepts frequencies from 1 kHz to 900 MHz (180 MHz maximum for CMOS inputs), and all inputs undergo continuous frequency and phase monitoring with 1 ps resolution.
Does the ZL30681LFG7 include internal non-volatile memory for configuration storage?
Yes, the ZL30681LFG7 features internal Flash memory that enables automatic self-configuration at power-up. Configuration scripts generated via Microsemi's evaluation software can be stored in this Flash, eliminating the need for external configuration devices or boot-time host intervention for repeatable, reliable startup behavior.
Can the ZL30681LFG7 generate PCIe-compliant spread-spectrum clocks?
Yes, the ZL30681LFG7 supports spread-spectrum modulation in each fractional output divider, meeting PCIe Gen3/Gen4 specifications. This feature is programmable per output and operates without external components, leveraging the device's built-in NCO architecture and 40-bit fractional dividers to maintain precise center frequency while applying controlled modulation.
What local oscillator options are compatible with the ZL30681LFG7?
The ZL30681LFG7 operates from a single low-cost XO (23.75–25 MHz, 47.5–50 MHz, or 114.285–125 MHz) connected to OSCI/OSCO. For high-stability applications, a TCXO or OCXO may be connected to a REF pin as a separate stability reference-decoupling jitter and stability requirements to reduce cost and simplify qualification.
How many high-performance outputs does the ZL30681LFG7 provide, and what signaling standards do they support?
The ZL30681LFG7 provides up to 16 high-performance outputs (HPOUT0–HPOUT7, each as P/N pair), configurable per bank as LVDS, LVPECL, HCSL, HSTL, or 2×CMOS. In 2×CMOS mode, HPOUTxP and HPOUTxN can run at different frequencies (e.g., 125 MHz and 25 MHz), and each output supports glitchless enable/disable and programmable duty cycle.
ZL30681LFG7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 80-VFLGA
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- Ethernet, SONET/SDH, Wireless Base Stations
- Input:
- CMOS
- Output:
- CMOS, HCSL, HSTL, LVDS, LVPECL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 5:10
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 1.045GHz
- Voltage - Supply:
- 1.8V, 3.3V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 80-LGA (11x11)
ZL30681LFG7 FAQ
1.How can I place an order for ZL30681LFG7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL30681LFG7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ZL30681LFG7 reliable?
The price and inventory of ZL30681LFG7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL30681LFG7 is usually 5 days.
3.What payment methods are accepted for ZL30681LFG7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL30681LFG7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL30681LFG7?
ZL30681LFG7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL30681LFG7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ZL30681LFG7?
For technical support, including ZL30681LFG7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL30681LFG7 requirements.
6.How does Aetrix verify that ZL30681LFG7 is sourced from the original manufacturer or authorized distributors?
All ZL30681LFG7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZL30681LFG7 meets industry standards.
7.What is the process for return or replacement of ZL30681LFG7?
All ZL30681LFG7 units undergo pre-shipment inspection (PSI). If there is an issue with ZL30681LFG7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ZL30681LFG7 part is unused and in its original packaging.
Return procedure for ZL30681LFG7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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