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Microchip Technology DSC557-053344KL1T
- Part No.:
- DSC557-053344KL1T
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Clock/Timing
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
DSC557-053344KL1T.pdf
- Description:
- IC CLOCK GEN PCIE 20VFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:345
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Product details
Overview
DSC557-053344KL1T from Microchip Technology (formerly Micrel) is a crystal-less, four-output PCIe clock generator compliant with Gen1/Gen2/Gen3 specifications. It delivers four 100 MHz differential HCSL outputs, operates from 2.25–3.6 V, achieves ±50 ppm frequency stability over –40°C to +105°C, and features dual output-enable control for synchronous bank management in high-reliability storage and networking systems.
For engineers reviewing the DSC557-053344KL1T datasheet, DSC557-053344KL1T pinout, DSC557-053344KL1T application, or DSC557-053344KL1T equivalent, key selection criteria include PCIe Gen3-compliant jitter (≤1.08 psRMS), 20-pin QFN package compatibility, HCSL output format, dual OE-controlled bank enable/disable, and MEMS-based crystal-free architecture for shock/vibration resilience.
Technical Context
The DSC557-053344KL1T implements a silicon MEMS resonator core with integrated PLL and output dividers to generate four synchronized 100 MHz PCIe reference clocks without external crystals. Its architecture supports independent enable/disable of two output banks (CLK0/CLK3 and CLK1/CLK2) via OE1 and OE2 pins, enabling dynamic power gating in multi-lane PCIe subsystems.
It meets PCIe Gen3 phase jitter requirements (JRMS-CC ≤1.08 psRMS), uses differential HCSL signaling with 750 mV single-ended swing and 200–400 ps transition times, and maintains stable operation across 2.25–3.6 V supply and –40°C to +105°C ambient - validated per MIL-STD-883 for shock/vibration immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Count & Format | Four differential HCSL outputs (CLK0±, CLK1±, CLK2±, CLK3±) at 100 MHz - directly compatible with PCIe Gen1/2/3 slot and root complex timing interfaces. |
| Frequency Stability | ±50 ppm over temperature, voltage, and aging - ensures reliable link training and low bit error rate in multi-lane PCIe interconnects. |
| Phase Jitter (Gen3) | 0.32–1.08 psRMS (JRMS-DC) - meets PCIe Gen3 common clock architecture jitter mask for 8 GT/s data rates. |
| Supply Range | 2.25 V to 3.6 V - supports direct connection to standard 3.3 V or 2.5 V I/O rails without LDO regulation. |
| Startup Time | 5 ms to 100 ppm stable output - enables fast system boot and PCIe enumeration without external reset coordination. |
| Operating Temp | –40°C to +105°C (Extended Industrial) - qualified for deployment in enterprise SSD controllers and telecom line cards. |
| Package | 20-pin QFN, 5.0 × 3.2 mm - surface-mount compatible with automated assembly and provides thermal pad for enhanced heat dissipation. |
Pinout & Package
Package: 20-pin QFN (5.0 × 3.2 mm), exposed thermal pad (to be connected to VSS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1 | Input | Active-high enable for CLK0± and CLK3± bank - allows independent power-down of first and fourth outputs during low-power link states. |
| OE2 | Input | Active-high enable for CLK1± and CLK2± bank - supports staggered lane activation in x16 PCIe slots. |
| CLK0± to CLK3± | Outputs | Differential HCSL pairs - each pair delivers 100 MHz with 48–52% duty cycle and 750 mV pk-pk swing into 50 Ω loads. |
| VDD (Pins 9, 19) | Power | Dual 3.3 V supply inputs - require local 0.01 µF decoupling per pin to suppress switching noise coupling into clock outputs. |
| VSS (Pins 3, 4, 13, 14) | Ground | Four dedicated ground pins plus thermal pad - minimize ground bounce and ensure clean return paths for all four differential outputs. |
| NC (Pins 2, 10, 12, 20) | No Connect | Must remain unconnected or grounded - no internal circuitry attached; floating NC pins may induce EMI or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less MEMS Core | Eliminates quartz crystal and associated load capacitors - reduces BOM count by 2–3 components and improves MTBF in high-vibration environments. |
| Dual Bank Output Enable | OE1/OE2 independently gate two synchronized output pairs - enables PCIe ASPM L1 substates and dynamic lane-width reconfiguration without clock glitches. |
| HCSL Output Compliance | Meets PCIe HCSL specification: 0.725 V VOH / 0.1 V VOL, 750 mV swing, <400 ps rise/fall - ensures signal integrity on FR4 backplanes up to 12″ trace length. |
| MIL-STD-883 Qualified | Validated for 2000 g shock and 20 g vibration - suitable for avionics, industrial control, and mobile infrastructure where mechanical stress is critical. |
| RoHS & Lead-Free | Meets JEDEC J-STD-020C MSL 1 reflow profile - supports lead-free manufacturing with peak solder temperature up to 260°C for 20 seconds. |
Applications
| Enterprise SSD Controllers | PCIe Switches & Bridges |
|---|---|
Use Scenario: Timing reference for NVMe SSD controller ASICs with multiple PCIe lanes and host-side PHYs. IC Role / Device Role / Timing Role: Primary 100 MHz PCIe reference clock generator for both upstream and downstream links. Use Value: ±50 ppm stability and Gen3-compliant jitter ensure reliable 8 GT/s link training and sustained throughput under thermal stress. | Use Scenario: Clock source for PCIe 3.0 switch ICs managing fan-out to multiple endpoints (e.g., GPUs, NICs, accelerators). IC Role / Device Role / Timing Role: Synchronous four-output clock distributor with bank-level enable for lane power management. Use Value: Dual OE control allows selective lane shutdown during idle periods, reducing system power by >15% without affecting active lanes. |
| Telecom Line Cards | Industrial Embedded Servers |
Use Scenario: Reference clock for 10G/25G Ethernet PHYs and PCIe-based packet processors in carrier-grade routers. IC Role / Device Role / Timing Role: Low-jitter, high-reliability clock generator operating in extended temperature range. Use Value: MIL-STD-883 qualification and –40°C to +105°C operation prevent timing failure in sealed, fanless chassis with high ambient temperatures. | Use Scenario: Timing solution for ruggedized edge servers using PCIe-based FPGA accelerators and storage modules. IC Role / Device Role / Timing Role: Crystal-free clock source eliminating mechanical failure modes in mobile or rail-mounted deployments. Use Value: MEMS-based architecture withstands 20 g vibration and repeated thermal cycling - extends field lifetime beyond quartz-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5332A-D-GM | Programmable 4-output clock generator with I²C interface; supports custom frequencies (not fixed 100 MHz); higher integration (integrated LDOs, spread spectrum). | Used where flexible frequency planning, dynamic reconfiguration, or EMI reduction are required - not drop-in for fixed 100 MHz PCIe Gen3. | Select when design requires programmability or multi-protocol support (e.g., SATA + PCIe); avoid if only Gen3-compliant 100 MHz is needed and cost sensitivity is high. |
| ICS8430I-01T | Fixed 4-output LVDS PCIe clock generator; ±100 ppm stability; -40°C to +85°C range; no OE bank control - all outputs enabled/disabled together. | Suitable for commercial-grade PCIe add-in cards or embedded PCs where extended temp and independent bank control are unnecessary. | Select for cost-sensitive, non-industrial designs with simpler power management; avoid if extended temperature or per-bank enable is required. |
Compared with Si5332A-D-GM and ICS8430I-01T, the DSC557-053344KL1T offers optimal balance of Gen3 compliance, dual-bank OE control, extended temperature operation, and crystal-free reliability - making it ideal for enterprise SSDs and telecom infrastructure where fixed 100 MHz timing and robustness are prioritized over programmability.
Availability
DSC557-053344KL1T is available at Aetrix Electronics and suitable for enterprise SSD controllers, PCIe switches, telecom line cards, and industrial embedded servers requiring stable component supply, long-term lifecycle assurance, and qualified extended-temperature performance.
Supply support for DSC557-053344KL1T 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 acquired Micrel in 2015 and integrates its precision analog and timing portfolio into broader MCU and power solutions. The company emphasizes reliability, longevity, and automotive/industrial qualification.
The DSC557 family belongs to Microchip's MEMS-based timing product line, designed specifically to replace quartz-based clock generators in PCIe, SATA, and Ethernet applications where shock resistance, fast startup, and supply voltage flexibility are critical.
FAQ
What is the output format and frequency of DSC557-053344KL1T?
The DSC557-053344KL1T provides four differential HCSL outputs, each fixed at 100 MHz - precisely aligned with PCIe Gen1/Gen2/Gen3 reference clock requirements. This configuration is factory-programmed and not user-adjustable; alternate formats (LVPECL/LVDS) require different orderable part numbers.
Does DSC557-053344KL1T require an external crystal?
No, the DSC557-053344KL1T is a crystal-less device using a monolithic silicon MEMS resonator. It eliminates the need for an external quartz crystal and associated load capacitors, reducing board space, BOM count, and susceptibility to mechanical shock and vibration - a key advantage over traditional crystal-based clock generators.
How does the OE1 and OE2 functionality work on DSC557-053344KL1T?
OE1 controls CLK0± and CLK3±; OE2 controls CLK1± and CLK2±. When either OE pin is low, its corresponding bank enters high-impedance state. Both OEs must be high to enable all four outputs. This dual-bank control enables PCIe Active State Power Management (ASPM) and dynamic lane-width scaling without clock glitches or retraining delays.
What is the operating temperature range and frequency stability of DSC557-053344KL1T?
The DSC557-053344KL1T is rated for –40°C to +105°C (Extended Industrial) with ±50 ppm total frequency stability - covering initial tolerance, temperature drift, and supply voltage variation. This exceeds standard PCIe Gen3 timing margin requirements and supports deployment in thermally demanding environments like sealed telecom chassis.
Is DSC557-053344KL1T RoHS compliant and what is its reflow profile?
Yes, DSC557-053344KL1T is RoHS compliant and qualified to JEDEC J-STD-020C MSL 1. Its reflow profile specifies peak temperature of 255–260°C for 20–40 seconds, ramp-up rate ≤3°C/sec, and preheat at 150–200°C for 60–180 seconds - fully compatible with standard lead-free SMT assembly processes.
DSC557-053344KL1T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- DSC557-05
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- PCI Express (PCIe)
- Input:
- -
- Output:
- HCSL, LVDS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 0:4
- Differential - Input:Output:
- No/Yes
- Frequency - Max:
- 100MHz
- Voltage - Supply:
- 2.25V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
DSC557-053344KL1T FAQ
1.How can I place an order for DSC557-053344KL1T through Aetrix?
Please submit a Request for Quotation (RFQ) for DSC557-053344KL1T 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 DSC557-053344KL1T reliable?
The price and inventory of DSC557-053344KL1T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DSC557-053344KL1T is usually 5 days.
3.What payment methods are accepted for DSC557-053344KL1T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DSC557-053344KL1T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DSC557-053344KL1T?
DSC557-053344KL1T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DSC557-053344KL1T 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 DSC557-053344KL1T?
For technical support, including DSC557-053344KL1T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DSC557-053344KL1T requirements.
6.How does Aetrix verify that DSC557-053344KL1T is sourced from the original manufacturer or authorized distributors?
All DSC557-053344KL1T 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 DSC557-053344KL1T meets industry standards.
7.What is the process for return or replacement of DSC557-053344KL1T?
All DSC557-053344KL1T units undergo pre-shipment inspection (PSI). If there is an issue with DSC557-053344KL1T, 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 DSC557-053344KL1T part is unused and in its original packaging.
Return procedure for DSC557-053344KL1T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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