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NXP Semiconductors PCKV857ADGG,512
- Part No.:
- PCKV857ADGG,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Clock/Timing
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCKV857ADGG,512.pdf
- Description:
- IC CLK BUF DDR 250MHZ 1CIRC
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
PCKV857ADGG,512 from NXP Semiconductors (formerly Philips Semiconductors) is a 2.5 V differential zero-delay clock buffer IC designed for DDR SDRAM clock distribution. It delivers 1:10 fanout across ten differential output pairs (Y0–Y9) plus feedback outputs (FBOUT/FBIN), operates from 100–250 MHz, features <150 ps output skew and <75 ps cycle-to-cycle jitter, and supports SSTL_2 interface levels in DDR266/300/333 DIMM systems.
For engineers reviewing the PCKV857ADGG,512 datasheet, PCKV857ADGG,512 pinout, PCKV857ADGG,512 application, or PCKV857ADGG,512 equivalent, key selection criteria include differential SSTL_2 I/O compatibility, PLL-enabled low-skew distribution, power-down control (PWRDWN), AVDD/AGND analog supply separation, and TSSOP-48 package thermal and layout constraints.
Technical Context
The PCKV857ADGG,512 integrates a PLL-based zero-delay architecture with differential SSTL_2 inputs (CLK/CLK, FBIN/FBIN) and outputs (Y0–Y9, FBOUT/FBOUT), enabling precise phase alignment between reference and distributed clocks. Its analog power domain (AVDD/AGND) isolates PLL circuitry from digital noise, while the PWRDWN control pin enables high-impedance output disable and PLL shutdown.
It supports spread-spectrum clock tracking to reduce EMI and includes an input frequency detection circuit that automatically disables the PLL below 20 MHz - re-enabling it upon restoration of >20 MHz input. The device is characterized for 0 °C to +70 °C operation and requires no external termination per SSTL_2 Type IV specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 100–250 MHz - defines usable DDR clock range for 266/300/333 MT/s memory interfaces |
| Output Skew | <150 ps - ensures timing margin preservation across all 10 differential output pairs |
| Jitter (Cycle-to-Cycle) | <75 ps - maintains setup/hold timing integrity at high-speed DDR data rates |
| Supply Voltages | VDDQ = 2.3–2.7 V; AVDD = 2.2–2.7 V - mandates separate analog/digital rail design and decoupling |
| I/O Standard | SSTL_2 - requires compatible memory controller and DIMM termination schemes |
| Power-Down Current | 30–100 µA - enables ultra-low standby power in system sleep states |
| Input Capacitance | 2.0–3.0 pF - constrains trace length and stub design for signal integrity |
Pinout & Package
Package: TSSOP-48 (SOT362-1), 6.1 mm body width, 0.5 mm lead pitch, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 13, 14 | CLK, CLK | Differential SSTL_2 clock input pair - drives PLL reference; requires matched-length routing |
| 35, 36 | FBIN, FBIN | Differential feedback input pair - closes PLL loop; routed from FBOUT outputs |
| 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 pair - all SSTL_2, driven simultaneously with minimal skew |
| 37 | PWRDWN | Active-HIGH power-down control - forces outputs to high-Z and disables PLL when LOW |
| 16 | AVDD | Analog supply for PLL core - must be filtered separately from VDDQ to prevent jitter degradation |
| 17 | AGND | Analog ground return - isolated from digital GND to minimize coupling into PLL |
| 4, 11, 12, 15, 21, 28, 34, 38, 46 | VDDQ | SSTL_2 I/O supply - powers all differential input/output buffers; 9 dedicated pins for low-impedance delivery |
| 1, 7, 8, 18, 24, 25, 31, 41, 42, 48 | GND | Digital ground - provides return path for VDDQ and logic; multiple pins reduce ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Zero-delay PLL architecture | Eliminates cumulative propagation delay across clock tree, preserving phase alignment between source and loads |
| SSTL_2 compliant I/O | Enables direct interfacing with DDR SDRAM controllers and modules without level-shifting or external termination |
| Spread-spectrum clock tracking | Reduces EMI peak emissions by dynamically adjusting PLL response to modulated input clocks |
| Auto-sleep on low-frequency input | Disables PLL and enters ultra-low-power mode when input falls below 20 MHz - no external control required |
| Test mode via AVDD grounding | Bypasses PLL and enables direct buffer pass-through for functional validation without PLL lock dependency |
Applications
| DDR266/300/333 DIMM Modules | Server Memory Subsystems |
|---|---|
Use Scenario: Distributing a single differential clock from memory controller to ten DDR SDRAM chips on a UDIMM or RDIMM module. IC Role / Device Role / Timing Role: Zero-delay clock buffer providing phase-aligned, low-skew copies to each DRAM device's CK/CK# inputs. Use Value: Maintains tight tAC and tDS/tDH margins across all devices, enabling stable operation at 333 MT/s with minimal board-level timing closure effort. | Use Scenario: Clocking multiple memory channels in dual-processor server motherboards with strict skew and jitter budgets. IC Role / Device Role / Timing Role: Fanout buffer replicating and distributing master clock to independent channel controllers and register buffers. Use Value: Enables synchronous multi-channel operation with sub-150 ps inter-channel skew, critical for NUMA-aware memory access consistency. |
| Industrial Embedded DDR Controllers | Test Equipment Memory Interfaces |
Use Scenario: Providing robust clock distribution in fanless industrial PCs where thermal headroom limits active cooling and voltage margins are tight. IC Role / Device Role / Timing Role: Low-power clock driver supporting 2.3–2.7 V VDDQ operation and auto-sleep during idle periods. Use Value: Reduces system standby current by >99% vs. always-on clock trees, extending operational lifetime in unattended deployments. | Use Scenario: Generating precisely synchronized clocks for high-speed memory test patterns in ATE platforms. IC Role / Device Role / Timing Role: Jitter-controlled clock source feeding pattern generators and capture receivers in memory BIST circuits. Use Value: Limits period jitter to <75 ps, ensuring accurate edge placement for sub-nanosecond timing measurement windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential clock distribution applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT IDT72V223L | 1:10 LVDS fanout (not SSTL_2); requires external level translation for DDR use | Limited to non-DDR systems or designs with LVDS-compatible memory interfaces | Select only if existing board uses LVDS signaling and no SSTL_2 termination is present |
| TI CDCVF2310 | 1:10 LVTTL/LVCMOS fanout; no PLL, no differential outputs, no SSTL support | Restricted to legacy SDR SDRAM or non-memory timing applications | Use only for cost-sensitive, low-frequency (<100 MHz), single-ended clock trees without DDR requirements |
Compared with IDT72V223L and CDCVF2310, the PCKV857ADGG,512 uniquely delivers SSTL_2-compliant differential outputs with integrated PLL-based zero-delay operation - making it the only option among the three qualified for JEDEC DDR266/300/333 DIMM clocking without signal conditioning or level translation.
Availability
PCKV857ADGG,512 is available at Aetrix Electronics and suitable for DDR memory subsystems, server motherboard designs, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCKV857ADGG,512 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,512 belongs to NXP's legacy high-speed clock distribution product line, engineered specifically for JEDEC-compliant DDR SDRAM timing integrity - emphasizing low skew, jitter control, and SSTL_2 interface compliance in memory-intensive computing platforms.
FAQ
What is the operating temperature range for the PCKV857ADGG,512?
The PCKV857ADGG,512 is characterized for operation from 0 °C to +70 °C ambient temperature. This commercial-grade range aligns with standard DIMM module and motherboard specifications. Operation outside this range is not guaranteed, and thermal derating or additional validation is required for extended temperature applications. The PCKV857ADGG,512 does not support industrial (−40 °C to +85 °C) or automotive temperature grades.
Does the PCKV857ADGG,512 require external termination resistors on its SSTL_2 outputs?
No, the PCKV857ADGG,512 is designed for SSTL_2 Type IV unterminated operation, meaning it drives directly into parallel-terminated loads without series resistors on the output traces. External 25 Ω or 50 Ω source termination is unnecessary. However, proper PCB layout - including controlled-impedance differential pairs (typically 100 Ω differential) and matched trace lengths - remains essential to maintain signal integrity and meet the PCKV857ADGG,512's specified skew and jitter performance.
How does the PWRDWN pin function in the PCKV857ADGG,512?
The PWRDWN pin on the PCKV857ADGG,512 is an active-HIGH control input. When held HIGH, the device operates normally with PLL enabled and outputs actively driven. When pulled LOW, all differential outputs enter high-impedance state and the PLL shuts down, reducing total supply current to 30–100 µA. This feature allows dynamic power gating in systems with variable memory activity, and the PCKV857ADGG,512 resumes normal operation within 100 µs after PWRDWN returns HIGH and a valid clock is applied.
Can the PCKV857ADGG,512 be used with DDR2 or DDR3 memory interfaces?
No, the PCKV857ADGG,512 is explicitly designed and characterized for DDR (DDR1) SDRAM applications up to 333 MT/s (166 MHz clock). It does not meet DDR2 or DDR3 electrical or timing specifications - including SSTL_18 I/O levels, higher frequency operation (>250 MHz), or updated command/address timing requirements. Using the PCKV857ADGG,512 in DDR2/DDR3 systems will result in signal integrity violations, timing failures, or non-compliance with JEDEC standards.
What is the purpose of the AVDD and AGND pins on the PCKV857ADGG,512?
The AVDD (Pin 16) and AGND (Pin 17) pins on the PCKV857ADGG,512 supply and return the analog portion of the device - specifically the PLL core and internal bias circuitry. Separating AVDD/AGND from the digital VDDQ/GND rails prevents switching noise from degrading PLL phase noise and output jitter. Proper design requires dedicated low-noise AVDD filtering (e.g., ferrite bead + 10 µF + 0.1 µF) and physical isolation of AGND from digital ground planes, with a single-point connection near the PCKV857ADGG,512 package.
PCKV857ADGG,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- 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,512 FAQ
1.How can I place an order for PCKV857ADGG,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCKV857ADGG,512 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,512 reliable?
The price and inventory of PCKV857ADGG,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCKV857ADGG,512 is usually 5 days.
3.What payment methods are accepted for PCKV857ADGG,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCKV857ADGG,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCKV857ADGG,512?
PCKV857ADGG,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCKV857ADGG,512 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,512?
For technical support, including PCKV857ADGG,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCKV857ADGG,512 requirements.
6.How does Aetrix verify that PCKV857ADGG,512 is sourced from the original manufacturer or authorized distributors?
All PCKV857ADGG,512 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,512 meets industry standards.
7.What is the process for return or replacement of PCKV857ADGG,512?
All PCKV857ADGG,512 units undergo pre-shipment inspection (PSI). If there is an issue with PCKV857ADGG,512, 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,512 part is unused and in its original packaging.
Return procedure for PCKV857ADGG,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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