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NXP Semiconductors PCKV857ADGV,112
- Part No.:
- PCKV857ADGV,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Clock/Timing
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCKV857ADGV,112.pdf
- Description:
- IC CLK BUF DDR 250MHZ 1CIRC
- Quantity:
- Payment:
- Shipping:
Inventory:2,558
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Product details
Overview
PCKV857ADGV,112 from NXP Semiconductors (formerly Philips Semiconductors) is a 100–250 MHz differential 1:10 zero-delay clock driver IC optimized for DDR SDRAM memory subsystems. It features SSTL_2 I/O, 2.2–2.7 V AVDD and 2.3–2.7 V VDDQ operation, <150 ps output skew, <75 ps period jitter, and power-down control for DDR-266/300/333 DIMM applications.
For engineers reviewing the PCKV857ADGV,112 datasheet, PCKV857ADGV,112 pinout, PCKV857ADGV,112 application, or PCKV857ADGV,112 equivalent, key selection criteria include differential clock fanout capability, SSTL_2 interface compliance, low-jitter timing performance, PLL-enabled zero-delay operation, and TSSOP-48 package compatibility with high-density DDR memory modules.
Technical Context
The PCKV857ADGV,112 integrates a PLL-based zero-delay architecture to distribute one differential clock input (CLK/CLK) to ten matched differential output pairs (Y0–Y9) plus feedback outputs (FBOUT/FBIN), all compliant with JEDEC SSTL_2 signaling. It supports spread-spectrum clock tracking and automatic PLL disable below 20 MHz.
Operation requires dual supply domains: analog AVDD (2.2–2.7 V) for PLL stability and digital VDDQ (2.3–2.7 V) for SSTL_2 I/O. Power-down mode (PWRDWN = LOW) places all outputs in high-impedance state and shuts down the PLL, reducing total current to ≤100 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock frequency range | 100–250 MHz - supports DDR-266 (133 MHz), DDR-300 (150 MHz), and DDR-333 (166 MHz) base clocks with margin |
| Output skew | ≤150 ps - ensures tight timing alignment across all 10 output pairs for synchronous memory access |
| Period jitter | ±75 ps - meets JEDEC timing budget for DDR SDRAM setup/hold margins at 200+ MHz |
| Supply voltage (AVDD) | 2.2–2.7 V - powers PLL core; grounding AVDD bypasses PLL for test-mode operation |
| Supply voltage (VDDQ) | 2.3–2.7 V - powers SSTL_2 I/O buffers; compatible with standard DDR memory bus voltage |
| Power-down current | ≤100 µA - enables low-power standby during memory idle cycles without external sequencing |
| Differential input voltage | 0.36–(VDDQ + 0.6) V - supports robust SSTL_2 signal detection across process/voltage/temperature corners |
Pinout & Package
Package: TVSOP-48 (SOT480-1), 4.4 mm body width, 0.4 mm lead pitch, lead-free and RoHS-compliant per original Philips specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 13, 14 | CLK, CLK | Differential SSTL_2 clock input pair - drives PLL reference; accepts DC-coupled or AC-coupled inputs |
| 35, 36 | FBIN, FBIN | Differential feedback input pair - closes PLL loop; connects to FBOUT outputs for zero-delay operation |
| 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 | SSTL_2 differential outputs - 10 clock distribution pairs + 1 feedback pair; all terminated internally per SSTL_2 Type IV |
| 37 | PWRDWN | CMOS active-HIGH control - asserts HIGH to enable outputs and PLL; LOW forces 3-state outputs and PLL shutdown |
| 16 | AVDD | Analog supply for PLL - must be decoupled locally; grounding disables PLL for test/bypass mode |
| 4, 11, 12, 15, 21, 28, 34, 38, 46 | VDDQ | SSTL_2 I/O supply - powers all output drivers and input receivers; nine dedicated pins reduce IR drop |
| 1, 7, 8, 18, 24, 25, 31, 41, 42, 48 | GND | Digital ground - 10 dedicated GND pins provide low-inductance return paths for high-speed switching |
| 17 | AGND | Analog ground - isolated reference for AVDD domain; must be connected to system ground at single point |
Key Features
| Feature | Design Value |
|---|---|
| Zero-delay PLL architecture | Eliminates cumulative propagation delay in multi-DIMM systems by locking output phase to input via internal feedback loop |
| SSTL_2 I/O compliance | Meets JEDEC JESD8-6 specifications for DDR memory clock interfaces without external termination resistors |
| Automatic low-frequency detection | Disables PLL and enters power-down when input falls below 20 MHz - prevents spurious lock and reduces EMI |
| Spread-spectrum clock tolerance | Tracks ±0.5% modulated input clocks to reduce electromagnetic interference in high-density memory subsystems |
| Test mode support | Grounding AVDD bypasses PLL while enabling buffer pass-through - simplifies functional validation on test fixtures |
Applications
| DDR-266 Memory Modules | DDR-300 Memory Modules |
|---|---|
Use Scenario: 256-MB unbuffered DIMMs used in desktop PCs and workstations operating at 133 MHz data rate. IC Role / Device Role / Timing Role: Distributes master clock from memory controller to 10 DRAM chips with matched trace-length-independent timing. Use Value: Enables full-speed DDR-266 operation without timing skew-induced read/write errors across rank boundaries. | Use Scenario: Registered DIMMs in entry-server platforms requiring stable 150 MHz clock delivery to 10+ DDR SDRAM devices. IC Role / Device Role / Timing Role: Acts as central clock repeater between memory controller and registered buffer (SSTL16877/SSTV16857). Use Value: Reduces signal loading on controller outputs and maintains <150 ps inter-output skew across temperature and voltage variation. |
| DDR-333 Memory Modules | High-Density DDR Memory Subsystems |
Use Scenario: Dual-rank 512-MB DIMMs deployed in industrial embedded controllers running at 166 MHz. IC Role / Device Role / Timing Role: Provides 1:10 fanout with zero-delay PLL compensation to meet tight tAC and tDS timing windows. Use Value: Guarantees reliable data capture at 333 MT/s by maintaining sub-75 ps period jitter and eliminating duty-cycle distortion. | Use Scenario: Multi-channel DDR memory interfaces in telecom line cards with >20 DRAM devices per channel. IC Role / Device Role / Timing Role: Clock distribution hub feeding multiple downstream clock buffers (e.g., SSTL16877) in cascaded topology. Use Value: Minimizes total path jitter accumulation and enables deterministic timing closure across complex PCB layouts. |
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 853S111BYI | 1:10 LVDS output; 1.8 V core; no integrated PLL; fixed 2.5 V VDDO | Lacks zero-delay capability; requires external feedback loop for phase alignment | Preferred where LVDS signaling and lower power are prioritized over PLL-based skew correction |
| ON Semiconductor NB3N502DR2G | 1:10 HCSL output; 3.3 V only; integrated PLL; higher jitter (±150 ps) | Designed for PCIe Gen1 clock trees; not SSTL_2 compliant | Applicable in mixed-protocol systems where HCSL interface and wider voltage tolerance outweigh DDR-specific optimization |
Compared with PCKV857ADGV,112, IDT 853S111BYI offers lower power but no PLL-based skew correction, while NB3N502DR2G provides broader voltage support but lacks SSTL_2 compliance - making PCKV857ADGV,112 uniquely suited for JEDEC-compliant DDR-266/300/333 memory clocking.
Availability
PCKV857ADGV,112 is available at Aetrix Electronics and suitable for DDR memory module manufacturing, server motherboard design, and industrial embedded systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for PCKV857ADGV,112 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips Semiconductors' high-performance analog and mixed-signal portfolio.
The PCKV857ADGV,112 belongs to NXP's legacy DDR clock distribution product line, engineered specifically to meet JEDEC SSTL_2 timing and signaling requirements for high-speed memory subsystems in computing and communications infrastructure.
FAQ
What is the operating temperature range for the PCKV857ADGV,112?
The PCKV857ADGV,112 is characterized for operation from 0 °C to +70 °C ambient temperature. This commercial-grade range aligns with standard DDR memory module environmental requirements and is validated across all specified electrical parameters including skew, jitter, and supply current. The device does not support extended or industrial temperature grades per its original Philips product data sheet.
Does the PCKV857ADGV,112 require external termination resistors on its SSTL_2 outputs?
No, the PCKV857ADGV,112 is designed for SSTL_2 Type IV unterminated operation and does not require external series or parallel termination resistors. Its output drivers are internally matched to drive 60 Ω differential loads directly, as confirmed by the test circuit in Figure 9 of the official datasheet and the note stating "intended to operate in the SSTL_2 type IV unterminated mode without series resistors."
How does the PCKV857ADGV,112 handle input frequencies below 20 MHz?
When the input clock frequency drops below 20 MHz, the PCKV857ADGV,112 automatically disables its PLL and places all outputs in high-impedance state, entering low-power mode with ≤100 µA total current draw. Once a >20 MHz signal is reapplied, the internal detection circuit re-enables the PLL and restores normal output operation - no external reset or configuration is needed.
Can the PCKV857ADGV,112 be used with DDR2 or DDR3 memory interfaces?
No, the PCKV857ADGV,112 is specifically designed for DDR (DDR1) SDRAM applications per JEDEC standards JESD79 and JESD8-6. It supports DDR-266/300/333 data rates and SSTL_2 signaling only. DDR2 uses SSTL_18 and DDR3 uses SSTL_15, both incompatible with the PCKV857ADGV,112's I/O structure and voltage ranges.
What is the function of the AVDD pin on the PCKV857ADGV,112?
The AVDD pin on the PCKV857ADGV,112 supplies the analog voltage (2.2–2.7 V) required for the internal PLL circuitry. When AVDD is grounded, the PLL is disabled and bypassed - enabling test-mode operation where clock signals pass through buffers without phase alignment. Proper local decoupling of AVDD is critical for achieving specified jitter and phase noise performance.
PCKV857ADGV,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-TFSOP (0.173", 4.40mm 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
PCKV857ADGV,112 FAQ
1.How can I place an order for PCKV857ADGV,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCKV857ADGV,112 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 PCKV857ADGV,112 reliable?
The price and inventory of PCKV857ADGV,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCKV857ADGV,112 is usually 5 days.
3.What payment methods are accepted for PCKV857ADGV,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCKV857ADGV,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCKV857ADGV,112?
PCKV857ADGV,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCKV857ADGV,112 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 PCKV857ADGV,112?
For technical support, including PCKV857ADGV,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCKV857ADGV,112 requirements.
6.How does Aetrix verify that PCKV857ADGV,112 is sourced from the original manufacturer or authorized distributors?
All PCKV857ADGV,112 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 PCKV857ADGV,112 meets industry standards.
7.What is the process for return or replacement of PCKV857ADGV,112?
All PCKV857ADGV,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCKV857ADGV,112, 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 PCKV857ADGV,112 part is unused and in its original packaging.
Return procedure for PCKV857ADGV,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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