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Microchip Technology ZL81001GGG2
- Part No.:
- ZL81001GGG2
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 256-BGA
- Datasheet:
-
ZL81001GGG2.pdf
- Description:
- SINGLE BITS TRANSCEIVER AND CC R
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
ZL81001GGG2 from Microsemi (now Microchip) is a carrier-grade DS1/E1/2048kHz BITS transceiver and dual composite clock (CC) receiver IC designed for synchronization signal conditioning in telecom timing subsystems. It supports full DS1 SF/ESF, E1 FAS/CAS/CRC-4, and G.703 2048kHz/6312kHz interfaces with SSM insertion/extraction, dual DPLL+APLL jitter filtering, and 1.8V core / 3.3V I/O operation across –40°C to +85°C.
For engineers reviewing the ZL81001GGG2 datasheet, ZL81001GGG2 pinout, ZL81001GGG2 application, or ZL81001GGG2 equivalent, key selection criteria include DS1/E1 framing compliance (T1.101, G.704), GR-378 CC receiver qualification, software-selectable line termination (75Ω/100Ω/110Ω/120Ω), high-impedance redundancy support, and JTAG boundary-scan testability per IEEE 1149.1.
Technical Context
The ZL81001GGG2 integrates two independent timing paths: a multi-protocol BITS transceiver with LIU front-end and framer logic, and two GR-378-compliant composite clock receivers each followed by dedicated DPLL+APLL stages. Its master clock generator derives a 204.8MHz system clock from a 12.8MHz external crystal, enabling precise phase alignment across all timing domains.
Receiver functionality includes automatic sensitivity adjustment, LOS/OOF/RAI/AIS detection, and AMI violation monitoring on CC inputs; transmitter features include programmable DSX-1 line build-outs, G.703-compliant waveforms for 75Ω coax and 120Ω twisted pair, and AIS/alternating ones-zeros generation - all controllable via 8-bit parallel or SPI interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Protocols | DS1 (T1.101), E1 (G.704/G.775), 2048kHz & 6312kHz (G.703), GR-378 CC |
| SSM Support | Insertion and extraction per DS1/E1 standards; enables traceable timing hierarchy |
| Input Sensitivity | –43 dBm min. for DS1; –36 dBm min. for E1; auto-adjusting receiver gain |
| Line Termination | Software-selectable 75Ω, 100Ω, 110Ω, or 120Ω; eliminates external resistor networks |
| Jitter Filtering | Dual DPLL+APLL per CC input; meets G.823/G.824 wander tolerance requirements |
| Interface | 8-bit parallel or SPI serial control; IEEE 1149.1 JTAG for boundary scan and debug |
| Supply | 1.8V core (±5%), 3.3V I/O (5V-tolerant); industrial temperature range (–40°C to +85°C) |
Pinout & Package
256-pin CSBGA package, 17 mm × 17 mm body, 0.8 mm pitch, RoHS-compliant. Thermal pad exposed on underside for enhanced heat dissipation in telecom backplane applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RRING1 / RTIP1 | BITS Receiver Analog Input | Differential DS1/E1/2048kHz receive path with software-selectable termination |
| TRING1 / TTIP1 | BITS Transmitter Analog Output | Differential transmit driver supporting short/long-haul line build-outs |
| IC1A / IC2A | Composite Clock Inputs | GR-378-compliant CC receivers with LOS/AMI/8 kHz component monitoring |
| REFCLK | Master Oscillator Input | Accepts 12.8MHz fundamental-mode crystal; feeds 204.8MHz internal PLL |
| IFSEL[2:0] | Interface Mode Select | Configures 8-bit parallel (non-mux/mux) or SPI serial microprocessor interface |
| JTMS / JTCLK / JTDI / JTDO | JTAG Test Access Port | IEEE 1149.1-compliant boundary scan for production test and debug |
Key Features
| Feature | Design Value |
|---|---|
| Redundancy-ready analog I/O | High-impedance receiver inputs and transmitter outputs eliminate need for relay switching in dual-card timing systems |
| Multi-standard framing engine | Single hardware supports DS1 SF/ESF, E1 FAS/CAS/CRC-4, and Japanese J1 (CRC-6/RAI) without firmware change |
| Programmable CC receiver configuration | Runtime selection of 50%/5/8 duty cycle, 1V/3V amplitude, and 110Ω/120Ω/133Ω termination per input |
| Integrated DPLL+APLL jitter cleanup | Two independent DPLL+APLL chains filter jitter/wander per CC input to meet GR-378 stability requirements |
| Fail-safe oscillator monitoring | On-chip watchdog timer detects REFCLK failure and asserts interrupt to host processor |
Applications
| SONET/SDH ADM Timing Interface | Digital Cross-Connect System (DCS) |
|---|---|
Use Scenario: Recovering and regenerating DS1/E1 timing from SONET/SDH add-drop multiplexers for distribution to legacy TDM equipment. IC Role / Device Role / Timing Role: BITS transceiver recovers embedded timing; CC receivers accept centralized sync from SSU; DPLL cleans jitter before retransmission. Use Value: Enables seamless interworking between SDH optical layer and PDH electrical layer while preserving SSM traceability and meeting G.823 jitter accumulation limits. | Use Scenario: Providing synchronized reference clocks to multiple DS1/E1 tributary cards in a large-scale digital cross-connect switch. IC Role / Device Role / Timing Role: Dual CC receivers monitor primary and backup GR-378 composite clocks; BITS transceiver distributes regenerated 2048kHz to downstream cards. Use Value: Eliminates external clock buffers and discrete DPLLs, reducing BOM count and board area while maintaining Telcordia GR-378 compliance. |
| Service Provider Edge Router Sync | Carrier-Grade Timing Shelf Controller |
Use Scenario: Accepting E1 timing from upstream SSU and transmitting DS1 timing to downstream access concentrators in metro aggregation routers. IC Role / Device Role / Timing Role: E1 receiver extracts SSM; DS1 transmitter inserts same SSM; local DPLL ensures holdover stability during input loss. Use Value: Maintains end-to-end timing integrity across heterogeneous network segments with automatic SSM pass-through and alarm propagation. | Use Scenario: Serving as central timing manager in a modular timing shelf, accepting up to four external references (two CC + one DS1 + one E1) and distributing cleaned clocks. IC Role / Device Role / Timing Role: Simultaneous dual CC reception plus BITS transceiver allows flexible reference prioritization and automatic switchover per GR-499 failover rules. Use Value: Reduces shelf controller complexity by integrating reference monitoring, jitter filtering, and protocol conversion into single device with JTAG visibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BITS/SSU transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip ZL81002GGG2 | Same die, extended temperature range (–40°C to +105°C); identical pinout and register map | Required for base station timing modules operating above 85°C ambient | Select ZL81002GGG2 only when extended thermal performance is mandated; otherwise ZL81001GGG2 suffices. |
| ON Semiconductor NB7L14M | Single-function 2048kHz clock receiver only; no BITS transceiver, no SSM, no CC support | Limited to simple clock recovery where framing, SSM, or redundancy are not needed | Use NB7L14M only for cost-sensitive non-carrier applications lacking multi-protocol or GR-378 requirements. |
Compared with ZL81001GGG2, ZL81002GGG2 offers identical functionality with higher thermal rating, while NB7L14M provides minimal clock recovery without framing, SSM, or composite clock capability - making ZL81001GGG2 the sole solution for full carrier-grade BITS/SSU timing integration.
Availability
ZL81001GGG2 is available at Aetrix Electronics and suitable for SONET/SDH ADMs, digital cross-connect systems, and service provider edge routers requiring stable component supply, long-lifecycle support, and carrier-grade reliability certification.
Supply support for ZL81001GGG2 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 Corporation (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability timing, power management, and RF solutions for aerospace, defense, and telecommunications.
The ZL81001GGG2 belongs to Microsemi's Precision Timing family, engineered specifically for carrier-class synchronization in SSU/BITS applications where GR-378 compliance, SSM handling, and multi-protocol interoperability are mandatory.
FAQ
What timing standards does the ZL81001GGG2 comply with?
The ZL81001GGG2 complies with ANSI T1.101 (DS1), ITU-T G.704/G.775 (E1), G.703 (2048kHz/6312kHz), and Telcordia GR-378 (composite clock). It also meets G.823/G.824 jitter/wander specifications and supports IEEE 1149.1 JTAG testing. These certifications ensure interoperability in global carrier networks and adherence to strict telecom synchronization requirements.
Does the ZL81001GGG2 support both DS1 and E1 framing formats?
Yes, the ZL81001GGG2 supports DS1 SF and ESF framing, as well as E1 FAS, CAS, and CRC-4 framing - including Japanese J1 mode with CRC-6 and RAI signaling. All framing modes are implemented in hardware and selectable via register configuration; no external logic or firmware translation is required to switch between protocols.
How does the ZL81001GGG2 handle Synchronization Status Messages (SSM)?
The ZL81001GGG2 fully supports SSM insertion and extraction per DS1 and E1 standards. It decodes incoming SSM bits from received signals and embeds them into transmitted frames. SSM values are accessible via status registers and can be modified by host software before transmission, enabling precise traceability in hierarchical timing networks.
Can the ZL81001GGG2 operate without an external crystal?
No - the ZL81001GGG2 requires a 12.8MHz fundamental-mode crystal connected to the REFCLK pin to generate its internal 204.8MHz master clock. The device contains no integrated oscillator; omission of this crystal prevents initialization and disables all timing functions, including BITS transceiver and CC receiver operation.
What is the purpose of the high-impedance I/O feature in the ZL81001GGG2?
The high-impedance receiver inputs and transmitter outputs in the ZL81001GGG2 enable true hot-swappable, relayless redundancy in dual-card timing architectures. When one card is removed or powered down, the other maintains uninterrupted signal path continuity - critical for carrier-grade "five-nines" uptime in central office environments where mechanical relays introduce failure points and signal degradation.
ZL81001GGG2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 256-BGA
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Transceiver
- Interface:
- E1
- Number of Circuits:
- 1
- Voltage - Supply:
- 1.62V ~ 1.98V
- Current - Supply:
- 152mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-PBGA (17x17)
ZL81001GGG2 FAQ
1.How can I place an order for ZL81001GGG2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZL81001GGG2 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 ZL81001GGG2 reliable?
The price and inventory of ZL81001GGG2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZL81001GGG2 is usually 5 days.
3.What payment methods are accepted for ZL81001GGG2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZL81001GGG2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZL81001GGG2?
ZL81001GGG2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZL81001GGG2 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 ZL81001GGG2?
For technical support, including ZL81001GGG2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZL81001GGG2 requirements.
6.How does Aetrix verify that ZL81001GGG2 is sourced from the original manufacturer or authorized distributors?
All ZL81001GGG2 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 ZL81001GGG2 meets industry standards.
7.What is the process for return or replacement of ZL81001GGG2?
All ZL81001GGG2 units undergo pre-shipment inspection (PSI). If there is an issue with ZL81001GGG2, 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 ZL81001GGG2 part is unused and in its original packaging.
Return procedure for ZL81001GGG2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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