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NXP Semiconductors PCKV857ADGG,518
- Part No.:
- PCKV857ADGG,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Clock/Timing
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCKV857ADGG,518.pdf
- Description:
- IC CLK BUF DDR 250MHZ 1CIRC
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
PCKV857ADGG,518 from NXP Semiconductors (formerly Philips Semiconductors) is a 100–250 MHz differential 1:10 zero-delay clock buffer with PLL-based skew compensation, designed for DDR SDRAM clock distribution in DIMM modules. It features SSTL_2 I/O, 2.2–2.7 V AVDD and 2.3–2.7 V VDDQ supply ranges, <150 ps output skew, and <75 ps cycle-to-cycle jitter - enabling reliable timing in DDR-266/300/333 systems.
For engineers reviewing the PCKV857ADGG,518 datasheet, PCKV857ADGG,518 pinout, PCKV857ADGG,518 application, or PCKV857ADGG,518 equivalent, key selection criteria include differential clock fanout capability, SSTL_2 interface compliance, power-down control behavior, PLL bypass mode for test, and TSSOP-48 package compatibility with high-density memory subsystem layouts.
Technical Context
The PCKV857ADGG,518 implements a PLL-based zero-delay architecture that locks to a differential input clock (CLK/CLK) and distributes it across ten matched differential output pairs (Y0–Y9) plus one feedback pair (FBOUT/FBIN), all referenced to SSTL_2 voltage levels. Its analog power domain (AVDD/AGND) isolates PLL circuitry from digital noise, while dedicated VDDQ pins ensure stable output drive under DDR load conditions.
Operation includes automatic PLL enable/disable based on input frequency detection (<20 MHz triggers low-power mode), CMOS-level PWRDWN control for 3-state output disable, and spread-spectrum clock tolerance for EMI reduction. The device enters full high-impedance state when PWRDWN is LOW, drawing only 30–100 µA total supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 100–250 MHz - supports DDR-266 (133 MHz), DDR-300 (150 MHz), and DDR-333 (166 MHz) base clocks with margin for system-level jitter accumulation. |
| Output Skew | <150 ps max - ensures synchronous edge alignment across all 10 differential outputs, critical for multi-rank DDR timing margins. |
| Jitter (Cycle-to-Cycle) | <75 ps peak-to-peak - maintains setup/hold timing integrity at DDR data rates up to 333 MT/s. |
| Supply Voltage Range | VDDQ: 2.3–2.7 V; AVDD: 2.2–2.7 V - matches SSTL_2 specification and enables interoperability with DDR memory controllers and buffers. |
| Input/Output Interface | SSTL_2 differential (CLK/CLK, FBIN/FBIN, Yn/Yn, FBOUT/FBOUT) - eliminates need for external termination resistors in unterminated mode per JEDEC JESD8-15A. |
| Power-Down Current | 30–100 µA (IDDPD) - allows deep sleep during idle cycles without compromising fast wake-up (<100 µs stabilization time). |
| Duty Cycle Tolerance | 40–60% - accommodates real-world clock source variations without degrading output symmetry or timing margins. |
Pinout & Package
Package: TSSOP-48 (SOT362-1), 6.1 mm body width, 0.5 mm lead pitch, lead-free compatible. Pin mapping validated per Philips SOT362-1 drawing and PCKV857A product data sheet (2003 Jul 31).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 13, 14 | CLK, CLK | Differential clock input pair - accepts SSTL_2-compliant reference clock; drives internal PLL and distribution network. |
| 35, 36 | FBIN, FBIN | Differential feedback input - connects to FBOUT/FBOUT loop to close PLL; determines phase lock point and jitter performance. |
| 2–3, 5–6, 9–10, 19–20, 22–23, 26–27, 29–30, 32–33, 39–40, 43–44, 46–47 | Y0–Y9, Y0–Y9, FBOUT, FBOUT | 10 differential clock outputs + 1 feedback output - all SSTL_2, matched routing required for skew control. |
| 37 | PWRDWN | CMOS-level active-HIGH power-down control - asserts high-impedance state on all outputs and disables PLL when LOW. |
| 16 | AVDD | Analog supply for PLL core - must be decoupled separately from VDDQ to minimize phase noise coupling. |
| 17 | AGND | Analog ground return - isolated from digital GND pins (1,7,8,18,24,25,31,41,42,48) to preserve PLL stability. |
| 4,11,12,15,21,28,34,38,46 | VDDQ | SSTL_2 I/O supply - powers all differential drivers; requires local 0.1 µF + bulk capacitance per VDDQ pin group. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-delay PLL architecture | Eliminates cumulative propagation delay across 10 outputs, maintaining deterministic phase relationship between input and all outputs. |
| Automatic low-frequency detection | Disables PLL and forces outputs to high-Z when input falls below 20 MHz - prevents metastability and reduces standby power without external logic. |
| SSTL_2 type IV unterminated operation | Enables direct connection to DDR memory devices without series resistors, reducing BOM count and PCB area in DIMM designs. |
| Spread-spectrum clock tolerance | Accepts modulated input clocks (±0.25–0.5% modulation depth) to lower EMI peaks without degrading jitter or skew performance. |
| Test mode via AVDD grounding | Grounding AVDD bypasses PLL and enables direct clock pass-through - simplifies functional validation and board-level debug. |
Applications
| DDR DIMM Clock Distribution | Server Memory Subsystem |
|---|---|
|
Use Scenario: Distributing a single differential reference clock to 10 DDR SDRAM chips on a UDIMM module operating at 333 MT/s. IC Role / Device Role / Timing Role: Zero-delay clock buffer with PLL-based skew compensation and SSTL_2 I/O interface. Use Value: Maintains <150 ps inter-output skew and <75 ps cycle-to-cycle jitter, ensuring robust tDS/tDH margins across all ranks under temperature and voltage variation. |
Use Scenario: Providing synchronized clocking to multiple DDR2 memory channels in a dual-processor server motherboard. IC Role / Device Role / Timing Role: High-fanout differential clock driver with independent power-down control per channel. Use Value: Enables dynamic channel gating via PWRDWN signal, reducing system-level power by >20 mA per inactive channel while preserving fast reactivation (<100 µs). |
| DDR-333 Registered DIMM | Industrial Embedded Memory Interface |
|
Use Scenario: Driving clock inputs of registered DDR SDRAMs and register ICs (e.g., SSTL16877) in a 240-pin RDIMM. IC Role / Device Role / Timing Role: PLL-stabilized 1:10 differential fanout buffer with FBOUT feedback path for closed-loop control. Use Value: Matches JEDEC DDR-333 timing requirements (tCK = 3.0 ns) with static phase offset ±350 ps, supporting full-speed operation across 0–70°C ambient range. |
Use Scenario: Clock distribution in ruggedized industrial controller with extended thermal cycling and EMI-sensitive environments. IC Role / Device Role / Timing Role: Spread-spectrum tolerant clock driver with latch-up immunity (>100 mA) and HBM ESD protection (>2000 V). Use Value: Ensures uninterrupted clock delivery during voltage transients and electromagnetic interference events, meeting IEC 61000-4-4 Level 3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential clock distribution applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V223L | 1:10 LVDS fanout, 150–250 MHz range, no integrated PLL; requires external feedback loop. | Lacks zero-delay capability and automatic low-frequency shutdown; suited for fixed-frequency, non-DDR systems. | Select when LVDS interface compatibility is required and PLL complexity must be minimized. |
| ICS85310AMI | 1:10 LVPECL fanout, 100–250 MHz, integrated PLL, but operates at 3.3 V VCC and uses PECL-level outputs. | Requires level-shifting for SSTL_2 DDR interfaces; higher power consumption (~400 mA vs. ~210 mA for PCKV857ADGG,518). | Choose for legacy 3.3 V systems where PECL signaling is already deployed and board space permits level translation. |
Compared with IDT72V223L and ICS85310AMI, the PCKV857ADGG,518 uniquely combines SSTL_2 native compatibility, 2.5 V operation, automatic PLL management, and TSSOP-48 footprint - making it the only drop-in solution for JEDEC-compliant DDR-266/300/333 DIMM clock trees without redesign.
Availability
PCKV857ADGG,518 is available at Aetrix Electronics and suitable for DDR memory module manufacturing, server motherboard design, industrial embedded controllers, and telecom baseband timing applications requiring stable component supply and long-term lifecycle support.
Supply support for PCKV857ADGG,518 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
NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and communication markets.
The PCKV857ADGG,518 belongs to NXP's legacy high-speed clock distribution portfolio, specifically engineered for JEDEC-compliant DDR SDRAM timing in cost-sensitive, high-volume memory module applications.
FAQ
What is the operating temperature range for the PCKV857ADGG,518?
The PCKV857ADGG,518 is characterized for operation from 0 °C to +70 °C ambient temperature. This commercial-grade range aligns with standard DIMM specifications and supports deployment in desktop, server, and industrial embedded environments where airflow and thermal management meet JEDEC-defined limits. All AC and DC parameters in the datasheet are guaranteed within this range.
Does the PCKV857ADGG,518 require external termination resistors on its SSTL_2 outputs?
No, the PCKV857ADGG,518 is designed for SSTL_2 Type IV unterminated operation, meaning it drives directly into parallel-terminated loads without series resistors. Its output impedance and drive strength are calibrated to match 60 Ω differential transmission lines, as confirmed in the test circuit (Figure 9) and application note SW00945. External termination is only needed at the far-end DDR device.
How does the PCKV857ADGG,518 handle input frequencies below 20 MHz?
When the input clock frequency drops below 20 MHz, the PCKV857ADGG,518 automatically disables its PLL and places all outputs in high-impedance state - entering low-power mode with total supply current reduced to 30–100 µA. Upon restoration of a >20 MHz signal, the PLL relocks within 100 µs, and outputs resume normal operation without external reset.
Can the PCKV857ADGG,518 be used with DDR2 or DDR3 memory interfaces?
The PCKV857ADGG,518 was explicitly designed for DDR-266/300/333 (DDR1) applications per JEDEC JESD79 specification and is not qualified for DDR2 or DDR3. Its SSTL_2 interface, 2.5 V supply range, and timing parameters (e.g., 100–250 MHz range, ±350 ps static phase offset) match DDR1 requirements but fall outside DDR2/DDR3 voltage (1.8 V/1.5 V), frequency (up to 533 MHz), and slew rate specifications.
What is the function of the AVDD and AGND pins on the PCKV857ADGG,518?
The AVDD (Pin 16) and AGND (Pin 17) pins supply and return the analog core of the PCKV857ADGG,518 - specifically the PLL, phase detector, and charge pump circuits. Separating analog and digital supplies prevents noise coupling from switching outputs into the timing loop, which is essential to achieve <75 ps cycle-to-cycle jitter. These pins must be decoupled with dedicated 0.1 µF ceramic capacitors placed adjacent to the package.
PCKV857ADGG,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- Memory, DDR, SDRAM
- Input:
- SSTL-2
- Output:
- SSTL-2
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:10
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 250MHz
- Voltage - Supply:
- 2.3V ~ 2.7V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-TSSOP
PCKV857ADGG,518 FAQ
1.How can I place an order for PCKV857ADGG,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCKV857ADGG,518 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 PCKV857ADGG,518 reliable?
The price and inventory of PCKV857ADGG,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCKV857ADGG,518 is usually 5 days.
3.What payment methods are accepted for PCKV857ADGG,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCKV857ADGG,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCKV857ADGG,518?
PCKV857ADGG,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCKV857ADGG,518 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 PCKV857ADGG,518?
For technical support, including PCKV857ADGG,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCKV857ADGG,518 requirements.
6.How does Aetrix verify that PCKV857ADGG,518 is sourced from the original manufacturer or authorized distributors?
All PCKV857ADGG,518 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 PCKV857ADGG,518 meets industry standards.
7.What is the process for return or replacement of PCKV857ADGG,518?
All PCKV857ADGG,518 units undergo pre-shipment inspection (PSI). If there is an issue with PCKV857ADGG,518, 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 PCKV857ADGG,518 part is unused and in its original packaging.
Return procedure for PCKV857ADGG,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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