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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

NXP Semiconductors PCK12429A,112

Name: PCK12429A,112
Brand: NXP Semiconductors
SKU: PCK12429A,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCK12429A,112

Manufacturer:: NXP Semiconductors

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 28-LCC (J-Lead)

Datasheet:: PCK12429A,112.pdf

Description:: IC CLOCK GENERATOR 28PLCC

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Product details

Overview

PCK12429A,112 from Philips Semiconductors is a differential PECL clock generator IC with synthesized architecture, supporting 25–400 MHz output frequency range, ±25 ps peak-to-peak jitter, and fully integrated PLL. It delivers programmable clock synthesis for high-speed serial/parallel interface timing in telecom infrastructure and computing systems.

For engineers reviewing the PCK12429A,112 datasheet, PCK12429A,112 pinout, PCK12429A,112 application, or PCK12429A,112 equivalent, key selection criteria include its 28-pin PLCC package, dual serial/parallel configuration interface, 3.3 V operation, quartz crystal reference support, and differential PECL output drive capability into 50 Ω loads.

Technical Context

The PCK12429A,112 implements a fully integrated phase-locked loop with a 9-bit M-divider (200–400) for VCO control and a 2-bit N-divider (1, 2, 4, or 8) for output scaling. Its internal oscillator uses an external series-resonant quartz crystal, divided by 16 before phase detection.

Configuration is supported via parallel interface (M[8:0], N[1:0], P_LOAD) with priority over serial 3-wire interface (S_DATA/S_CLOCK/S_LOAD), enabling power-up initialization and runtime reprogramming. The device separates PLL_VCC and VCC1 supplies to minimize noise coupling and maintains 45–55% output duty cycle across all division ratios.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency Range	25–400 MHz differential PECL - covers PCI, Ethernet, and backplane clocking requirements
Jitter (Peak-to-Peak)	±25 ps - meets stringent timing budgets for high-speed SerDes and memory interfaces
Supply Voltage	3.3 V ±5% - compatible with modern low-voltage digital systems
Output Driver Type	Differential PECL - drives 50 Ω transmission lines terminated to VCC–2.0 V
Reference Input	External quartz crystal (10–20 MHz) - enables stable, low-phase-noise synthesis
Configuration Interface	Parallel (9-bit M + 2-bit N) and serial (14-bit shift register) - supports both boot-time setup and dynamic frequency tuning
PLL Lock Time	≤10 ms - ensures rapid system startup and frequency switching

Pinout & Package

Package: 28-pin plastic leaded chip carrier (PLCC28), SOT261-2, body outline per JEDEC MS-026, operating temperature range 0 to +70 °C.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Logic & output buffer supply	+3.3 V for internal logic and PECL drivers; separate from PLL_VCC to reduce noise coupling
PLL_VCC	PLL analog supply	+3.3 V dedicated to phase-locked loop; requires low-noise filtering for jitter performance
XTAL1 / XTAL2	Crystal oscillator terminals	Form series-resonant oscillator with external fundamental AT-cut crystal (16 MHz typical)
FOUT / FOUT	Differential PECL outputs	Complementary signals driving 50 Ω loads; 2.17–2.50 V HIGH, 1.41–1.76 V LOW (VCC0 referenced)
M[8:0]	Parallel PLL divider input	9-bit bus setting M-divider value (200–400); sampled on P_LOAD rising edge
N[1:0]	Parallel output divider input	2-bit bus selecting N = 1, 2, 4, or 8; determines final output frequency step size
P_LOAD	Parallel load strobe	Active-HIGH signal latching M[8:0] and N[1:0]; internal pullup enables default configuration at power-up
S_DATA / S_CLOCK / S_LOAD	Serial configuration interface	3-wire interface loading 14-bit shift register (T[2:0], N[1:0], M[8:0]); requires P_LOAD = HIGH during operation
OE	Output enable	Active-HIGH synchronous enable; prevents runt pulses on FOUT during state transitions
TEST	Debug/test output	Configurable via T[2:0] bits; provides visibility into FREF, M counter, PLL bypass mode, or FOUT/4
GND	Ground reference	Common return for logic, PLL, and output stages; multiple pins ensure low-impedance return path

Key Features

Feature	Design Value
Integrated PLL with no external loop filter	Eliminates discrete capacitors/resistors, reducing BOM count and layout sensitivity
Programmable output division (N = 1, 2, 4, 8)	Enables precise frequency selection in 1 MHz steps when using 16 MHz crystal reference
Dual configuration interfaces (serial + parallel)	Supports fixed boot-time clocking via parallel inputs and dynamic reconfiguration via serial port
Separate PLL and logic power domains	Reduces supply-induced jitter by isolating sensitive analog PLL circuitry from digital switching noise
PECL output with 50% duty cycle guarantee	Ensures balanced rise/fall times and minimal duty-cycle distortion across full frequency range
Crystal oscillator optimized for series resonance	Accepts standard AT-cut crystals without external load capacitors; improves stability vs. parallel-resonant designs

Applications

Telecom Line Cards	PCI Express Clocking
Use Scenario: Generating synchronized 100 MHz and 125 MHz clocks for multi-port SONET/SDH framers and SERDES transceivers in line card modules. IC Role / Device Role / Timing Role: Primary synthesized clock source providing low-jitter differential PECL clocks to multiple downstream devices. Use Value: ±25 ps jitter enables clean eye diagrams at OC-48/STM-16 data rates; dual N-divider outputs allow concurrent generation of multiple protocol-aligned frequencies.	Use Scenario: Delivering 100 MHz reference clock to PCIe root complex and endpoint devices in server motherboard designs. IC Role / Device Role / Timing Role: System-level clock synthesizer configured at power-up via parallel interface to meet PCIe Gen1/Gen2 timing specifications. Use Value: Fully integrated PLL eliminates external loop components; 3.3 V operation matches host platform voltage rails; PECL outputs drive long traces with minimal skew.
Network Switch ASIC Timing	High-Speed Memory Controller Clocking
Use Scenario: Providing 200 MHz differential clock to switch fabric ASICs requiring tight inter-lane skew control in 10 GbE switching platforms. IC Role / Device Role / Timing Role: Low-phase-noise clock generator feeding multiple ASIC clock inputs through controlled-impedance routing. Use Value: 25–400 MHz range supports scalable clocking across generations; PLCC28 package allows robust thermal and mechanical mounting in dense board layouts.	Use Scenario: Supplying 133 MHz DDR2 memory controller clock with matched rise/fall characteristics for timing-critical address/control buses. IC Role / Device Role / Timing Role: Precision clock source delivering 50% duty cycle PECL signals to memory PHY layers. Use Value: Guaranteed 45–55% duty cycle minimizes setup/hold margin erosion; ±25 ps jitter preserves timing margins under varying load conditions.

Telecom Line Cards

PCI Express Clocking

Use Scenario: Generating synchronized 100 MHz and 125 MHz clocks for multi-port SONET/SDH framers and SERDES transceivers in line card modules.

IC Role / Device Role / Timing Role: Primary synthesized clock source providing low-jitter differential PECL clocks to multiple downstream devices.

Use Value: ±25 ps jitter enables clean eye diagrams at OC-48/STM-16 data rates; dual N-divider outputs allow concurrent generation of multiple protocol-aligned frequencies.

Use Scenario: Delivering 100 MHz reference clock to PCIe root complex and endpoint devices in server motherboard designs.

IC Role / Device Role / Timing Role: System-level clock synthesizer configured at power-up via parallel interface to meet PCIe Gen1/Gen2 timing specifications.

Use Value: Fully integrated PLL eliminates external loop components; 3.3 V operation matches host platform voltage rails; PECL outputs drive long traces with minimal skew.

Network Switch ASIC Timing

High-Speed Memory Controller Clocking

Use Scenario: Providing 200 MHz differential clock to switch fabric ASICs requiring tight inter-lane skew control in 10 GbE switching platforms.

IC Role / Device Role / Timing Role: Low-phase-noise clock generator feeding multiple ASIC clock inputs through controlled-impedance routing.

Use Value: 25–400 MHz range supports scalable clocking across generations; PLCC28 package allows robust thermal and mechanical mounting in dense board layouts.

Use Scenario: Supplying 133 MHz DDR2 memory controller clock with matched rise/fall characteristics for timing-critical address/control buses.

IC Role / Device Role / Timing Role: Precision clock source delivering 50% duty cycle PECL signals to memory PHY layers.

Use Value: Guaranteed 45–55% duty cycle minimizes setup/hold margin erosion; ±25 ps jitter preserves timing margins under varying load conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT5V41201PGI	LVDS output (not PECL); 0.5–220 MHz range; integrated crystal oscillator option	Targets lower-frequency, lower-power applications where LVDS compatibility is required	Select when system uses LVDS receivers or requires on-chip crystal oscillator to reduce component count
ICS843002AGI-01LFT	LVPECL output; 10–700 MHz; 3.3 V; includes spread-spectrum modulation	Designed for EMI reduction in noise-sensitive environments like consumer electronics	Select when EMI compliance is critical and spread-spectrum capability is needed; verify PECL/LVPECL level compatibility

Compared with PCK12429A,112, IDT5V41201PGI offers LVDS signaling and narrower frequency range but integrates oscillator functionality, while ICS843002AGI-01LFT extends upper frequency limit and adds spread-spectrum control-neither matches the PCK12429A,112's combination of pure PECL drive, 25–400 MHz coverage, and dual-configuration flexibility without spread spectrum.

Availability

PCK12429A,112 is available at Aetrix Electronics and suitable for telecom infrastructure, server motherboard design, and high-speed networking equipment requiring stable component supply and long-term lifecycle continuity.

Supply support for PCK12429A,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

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor manufacturer founded in the Netherlands, specializing in analog, mixed-signal, and interface solutions for industrial, automotive, and communications markets.

The PCK12429A,112 belongs to Philips' high-performance clock synthesis product line, designed specifically for applications demanding low-jitter, programmable differential clock generation in telecom and computing systems.

FAQ

What is the maximum output frequency supported by the PCK12429A,112?

The PCK12429A,112 supports a maximum differential PECL output frequency of 400 MHz. This is achieved when the N-divider is set to 1 and the M-divider is configured for 400 (FOUT = M ÷ N). The device maintains ±25 ps peak-to-peak jitter up to this frequency, as verified in the AC Characteristics section of the datasheet under Tamb = 0 to +70 °C and VCC = 3.3 V ±5%.

Does the PCK12429A,112 require external loop filter components?

No, the PCK12429A,112 features a fully integrated phase-locked loop with no external loop filter components required. The internal loop filter is monolithic and optimized for stability across the 200–400 MHz VCO range. This eliminates discrete capacitors and resistors traditionally needed for PLL compensation, simplifying layout and improving repeatability in high-volume manufacturing.

Can the PCK12429A,112 operate with a 16.666 MHz crystal reference?

Yes, the PCK12429A,112 supports crystal references from 10–20 MHz, including 16.666 MHz. Using this reference, the device can generate frequencies such as 133.333 MHz (e.g., for PCI clocking) by selecting M = 256 and N = 2. The formula FOUT = (FXTAL ÷ 16) × M ÷ N applies, and M must remain within 200–400 for stable PLL lock-verified in the Programming Interface section of the datasheet.

What is the function of the TEST pin on the PCK12429A,112?

The TEST pin on the PCK12429A,112 is configurable via T[2:0] bits in the serial data stream and provides visibility into internal nodes including FREF, M-counter output, PLL bypass mode, or FOUT/4. In normal operation, it defaults to SHIFT REGISTER OUT (T[2:0] = 000) to minimize jitter impact. Active use of TEST affects PECL output jitter, so it must remain static when jitter specifications are guaranteed.

Is the PCK12429A,112 pin-compatible with other variants in the PCK12429 family?

The PCK12429A,112 (PLCC28) shares identical pin functions with the PCK12429D (SO28) and PCK12429BD (LQFP32), though physical pinouts differ due to package geometry. Signal mapping-including M[8:0], N[1:0], S_DATA/S_CLOCK/S_LOAD, FOUT/FOUT, and PLL_VCC-is consistent across all variants. PCB layout must match the specific package footprint, but logic-level interface design and configuration code are fully interchangeable.

PCK12429A,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 28-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock Generator

PLL:: Yes

Input:: Crystal

Output:: PECL

Number of Circuits:: 1

Ratio - Input:Output:: 1:1

Differential - Input:Output:: No/Yes

Frequency - Max:: 400MHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 28-PLCC (11.48x11.48)

PCK12429A,112 FAQ

1.How can I place an order for PCK12429A,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCK12429A,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 PCK12429A,112 reliable?

The price and inventory of PCK12429A,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCK12429A,112 is usually 5 days.

3.What payment methods are accepted for PCK12429A,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCK12429A,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCK12429A,112?

PCK12429A,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCK12429A,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 PCK12429A,112?

For technical support, including PCK12429A,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCK12429A,112 requirements.

6.How does Aetrix verify that PCK12429A,112 is sourced from the original manufacturer or authorized distributors?

All PCK12429A,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 PCK12429A,112 meets industry standards.

7.What is the process for return or replacement of PCK12429A,112?

All PCK12429A,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCK12429A,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 PCK12429A,112 part is unused and in its original packaging.

Return procedure for PCK12429A,112:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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