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

NXP Semiconductors MPC9992AC

Name: MPC9992AC
Brand: NXP Semiconductors
SKU: MPC9992AC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPC9992AC

Manufacturer:: NXP Semiconductors

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 32-LQFP

Datasheet:: MPC9992AC.pdf

Description:: IC CLOCK GENERATOR 32LQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPC9992AC from NXP Semiconductors (formerly Freescale) is a 3.3 V differential PECL clock generator IC implementing SiGe-based PLL architecture with seven differential outputs, 400 MHz maximum output frequency, <100 ps output-to-output skew, and dual-bank programmable frequency synthesis for telecom and high-end computing systems.

For engineers reviewing the MPC9992AC datasheet, MPC9992AC pinout, MPC9992AC application, or MPC9992AC equivalent, this device supports LVCMOS control inputs, selectable crystal/PECL reference input, SYNC pulse generation for non-integer-ratio bank synchronization, and requires no external loop filter components - critical for low-jitter clock distribution in multi-clock-domain systems.

Technical Context

The MPC9992AC uses a fully differential SiGe PLL to lock outputs to either a differential PECL reference (PCLK/PCLK) or a crystal oscillator (XTAL_IN/XTAL_OUT), with VCO frequency range 800–1600 MHz and programmable feedback dividers (÷32 to ÷160) controlled by FSEL[1:0] and VCO_SEL pins. Its three output banks (QA[3:0], QB[2:0], QSYNC) support integer and fractional ratios including 2:1, 3:1, 3:2, and 5:2.

Phase alignment between QA and QB banks triggers the differential QSYNC output - a one-cycle-wide pulse synchronized to QA period - enabling deterministic system-level timing coordination. The device operates with separate analog (VCC_PLL) and digital (VCC) supplies, and includes static PLL bypass mode (via PLL_EN) for test, where reference clock passes directly to output dividers without PLL involvement.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V ±5% - single supply powers both digital outputs and analog PLL; VCC_PLL must be ≥2.955 V for stable jitter performance.
Max Output Frequency	400 MHz - achieved on ÷4 output path; enables direct clocking of high-speed SerDes, memory interfaces, and ASICs.
Output Skew	<100 ps - guaranteed max skew across all 7 differential PECL output pairs ensures tight timing margins in parallel bus systems.
Input Reference Range	5–50 MHz (crystal or PECL) - supports wide-range crystal oscillators and low-jitter differential clocks via REF_SEL selection.
PLL Jitter (RMS)	86–212 ps - I/O phase jitter measured at 1σ; defines timing uncertainty budget for synchronous logic sampling windows.
Operating Temp	0°C to +70°C ambient - validated DC/AC specs across full range; junction temperature limited to 110°C for reliability.
Package	32-lead Pb-free LQFP (Case 873A-04) - standard surface-mount footprint compatible with IPC-7351B land pattern.

Pinout & Package

Package: 32-lead LQFP (Case 873A-04), 7 mm × 7 mm body, 0.8 mm pitch, Pb-free compliant.

Pin	Circuit Role	Design Meaning
PCLK / PCLK	Differential PECL input	Primary reference clock pair; accepts AC-coupled 50 Ω-terminated signals with 0.3–1.3 Vpp swing.
XTAL_IN / XTAL_OUT	Crystal oscillator interface	Supports fundamental-mode crystals 10–20 MHz; internal load capacitance optimized for standard 12–18 pF crystals.
QA0–QA3 / QA0–QA3	Differential PECL outputs (Bank A)	Four independent differential clock outputs; each pair drives 50 Ω to VTT (VCC–2 V); duty cycle 48–52%.
QB0–QB2 / QB0–QB2	Differential PECL outputs (Bank B)	Three differential outputs with programmable ratio vs. Bank A; used for secondary clock domains (e.g., I/O, memory).
QSYNC / QSYNC	Differential synchronization pulse	One-shot pulse aligned to QA period edge; asserts for exactly one QA cycle duration to coordinate non-integer-ratio banks.
FSEL[1:0], VCO_SEL, REF_SEL, PLL_EN, MR/STOP	LVCMOS control inputs	5-pin configuration interface; sets PLL feedback ratio, VCO scaling, reference source, bypass mode, and hard reset.
VCC, VCC_PLL, GND	Power terminals	VCC (digital supply) and VCC_PLL (analog PLL supply) require separate decoupling; VCC_PLL needs RC filter (10–15 Ω + 33–100 nF) per datasheet Fig. 4.

Key Features

Feature	Design Value
SiGe PLL core	Delivers sub-100 ps skew and low phase jitter (86 ps RMS) without external loop filter components.
Triple-bank output architecture	QA (4 diff), QB (3 diff), QSYNC (1 diff) enable independent clock domains with deterministic inter-bank alignment.
Programmable frequency ratios	Hardware-configurable 2:1, 3:1, 3:2, 5:2 ratios via FSEL/VCO_SEL pins - no serial interface required.
Reference flexibility	Single-pin REF_SEL selects between differential PECL input or crystal oscillator - simplifies board design across clock source options.
Static PLL bypass mode	PLL_EN = 0 routes reference clock directly to output dividers; eliminates minimum frequency limit and enables functional test without lock.

Applications

Telecom Line Cards	High-End Workstation Clocking
Use Scenario: Synchronizing multiple FPGA-based packet processing engines and SerDes transceivers on a 10G/40G line card. IC Role / Device Role / Timing Role: Primary clock generator distributing low-skew, multi-frequency clocks (e.g., 156.25 MHz, 312.5 MHz) to PHYs, MACs, and memory controllers. Use Value: <100 ps skew ensures setup/hold compliance across distributed logic; QSYNC coordinates reset sequencing between non-harmonic clock domains.	Use Scenario: Providing independent, phase-aligned clocks to CPU, GPU, and DDR4 memory subsystems in a dual-socket server motherboard. IC Role / Device Role / Timing Role: Central PLL-based clock source generating 100 MHz system clock, 200 MHz memory clock, and 400 MHz reference for PCIe Gen4 PHYs. Use Value: Programmable 2:1 and 3:2 ratios eliminate need for discrete clock synthesizers; separate VCC_PLL supply isolates jitter-sensitive PLL from digital noise.
Mainframe I/O Subsystem	Test Equipment Timing Engine
Use Scenario: Driving parallel backplane clocks for legacy I/O adapters requiring precise skew matching across 32-bit data paths. IC Role / Device Role / Timing Role: Low-jitter PECL clock distributor with banked outputs ensuring simultaneous edge alignment across multiple slots. Use Value: Guaranteed <100 ps skew meets IEEE 1149.1 boundary-scan timing requirements; LVCMOS control allows FPGA-based dynamic reconfiguration.	Use Scenario: Generating synchronized stimulus and capture clocks in high-speed digital pattern generators with multi-channel timing precision. IC Role / Device Role / Timing Role: Reference clock conditioner and multiplier providing phase-locked, low-phase-noise clocks to DACs, ADCs, and trigger circuitry. Use Value: 86 ps RMS phase jitter enables accurate time-interval measurement down to ~100 ps resolution; SYNC pulse aligns acquisition windows across channels.

Telecom Line Cards

High-End Workstation Clocking

Use Scenario: Synchronizing multiple FPGA-based packet processing engines and SerDes transceivers on a 10G/40G line card.

IC Role / Device Role / Timing Role: Primary clock generator distributing low-skew, multi-frequency clocks (e.g., 156.25 MHz, 312.5 MHz) to PHYs, MACs, and memory controllers.

Use Value: <100 ps skew ensures setup/hold compliance across distributed logic; QSYNC coordinates reset sequencing between non-harmonic clock domains.

Use Scenario: Providing independent, phase-aligned clocks to CPU, GPU, and DDR4 memory subsystems in a dual-socket server motherboard.

IC Role / Device Role / Timing Role: Central PLL-based clock source generating 100 MHz system clock, 200 MHz memory clock, and 400 MHz reference for PCIe Gen4 PHYs.

Use Value: Programmable 2:1 and 3:2 ratios eliminate need for discrete clock synthesizers; separate VCC_PLL supply isolates jitter-sensitive PLL from digital noise.

Mainframe I/O Subsystem

Test Equipment Timing Engine

Use Scenario: Driving parallel backplane clocks for legacy I/O adapters requiring precise skew matching across 32-bit data paths.

IC Role / Device Role / Timing Role: Low-jitter PECL clock distributor with banked outputs ensuring simultaneous edge alignment across multiple slots.

Use Value: Guaranteed <100 ps skew meets IEEE 1149.1 boundary-scan timing requirements; LVCMOS control allows FPGA-based dynamic reconfiguration.

Use Scenario: Generating synchronized stimulus and capture clocks in high-speed digital pattern generators with multi-channel timing precision.

IC Role / Device Role / Timing Role: Reference clock conditioner and multiplier providing phase-locked, low-phase-noise clocks to DACs, ADCs, and trigger circuitry.

Use Value: 86 ps RMS phase jitter enables accurate time-interval measurement down to ~100 ps resolution; SYNC pulse aligns acquisition windows across channels.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PLL-based differential clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC100LVEP111FN	8-output ECL clock driver with fixed 1:1, 1:2, 1:4 division; no PLL, no crystal interface, no QSYNC.	Lacks frequency synthesis and inter-bank synchronization; suited only for fanout-only applications with existing master clock.	Select when only clock distribution (not generation) is needed and system already provides clean, stable reference.
ICS853S01I	3.3 V LVDS clock generator with integrated crystal oscillator, 4 outputs, max 250 MHz; no differential PECL outputs or QSYNC.	LVDS signaling limits drive strength and noise immunity vs. PECL; lower max frequency restricts use in >250 MHz SerDes links.	Choose for cost-sensitive, lower-frequency embedded systems where LVDS compatibility and integrated crystal reduce BOM count.

Compared with MC100LVEP111FN and ICS853S01I, the MPC9992AC uniquely combines PECL-level outputs, hardware-programmable PLL ratios up to 400 MHz, and QSYNC-based cross-bank synchronization - making it irreplaceable in telecom and high-performance computing clock trees requiring deterministic multi-frequency alignment.

Availability

MPC9992AC is available at Aetrix Electronics and suitable for telecom infrastructure, high-end workstation motherboards, mainframe I/O subsystems, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for MPC9992AC 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' semiconductor division, specializing in secure connectivity solutions, automotive processors, and high-performance analog/mixed-signal ICs.

The MPC9992AC belongs to NXP's Advanced Clock Drivers product line, designed specifically for low-jitter, multi-output clock generation in mission-critical telecom, computing, and test instrumentation systems demanding precise inter-bank synchronization.

FAQ

What is the maximum operating frequency supported by the MPC9992AC?

The MPC9992AC supports a maximum output frequency of 400 MHz on its ÷4 output path. This is achieved when the VCO operates at 1600 MHz and the output divider is set to ÷4. All AC specifications, including jitter and skew, are guaranteed at this frequency under specified conditions (VCC = 3.3 V ±5%, TA = 0°C to +70°C, 50 Ω termination to VTT). Higher frequencies are not supported by the MPC9992AC architecture.

Does the MPC9992AC require external loop filter components?

No, the MPC9992AC does not require external loop filter components. Its fully integrated SiGe PLL includes on-die charge pump and loop filtering, enabling direct connection of the crystal or differential reference without discrete RC networks. This simplifies layout and improves jitter stability compared to discrete-loop PLLs. The MPC9992AC datasheet explicitly states "requires no external loop filter components" as a key feature.

How does the QSYNC output function in the MPC9992AC?

The QSYNC output in the MPC9992AC is a differential PECL pulse generated when edges of QA and QB output banks coincide. It asserts for exactly one QA output period and is used to synchronize logic across non-integer-ratio clock domains. For example, in 3:2 mode, QSYNC pulses occur every third QA cycle and second QB cycle. This behavior is hardware-determined and requires no software control - a defining capability of the MPC9992AC.

What power supply filtering is recommended for the MPC9992AC VCC_PLL pin?

A series RC filter is required on the VCC_PLL pin: a 10–15 Ω resistor (RF) followed by parallel capacitors - typically 33–100 nF ceramic + 22 µF tantalum (per Figure 4 in the MPC9992AC datasheet). This filter attenuates noise above 100 kHz by >40 dB, protecting the analog PLL from digital switching noise. Failure to implement this filter risks increased phase jitter and potential loss of PLL lock in noisy environments.

Is the MPC9992AC pin-compatible with any other clock generator ICs?

Yes, the MPC9992AC is pin and function compatible with the MPC992, as confirmed in the official datasheet: "Pin and function compatible to the MPC992". Both devices share identical 32-lead LQFP package (Case 873A-04), matching pin assignments for all signals including PCLK, QA/QB outputs, FSEL, REF_SEL, and VCC_PLL. This allows drop-in replacement in legacy MPC992 designs while gaining improved jitter and extended frequency range.

MPC9992AC Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 32-LQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock Generator, Fanout Distribution, Multiplexer

PLL:: Yes with Bypass

Input:: PECL, Crystal

Output:: PECL

Number of Circuits:: 1

Ratio - Input:Output:: 2:7

Differential - Input:Output:: Yes/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:: 32-LQFP (7x7)

MPC9992AC FAQ

1.How can I place an order for MPC9992AC through Aetrix?

Please submit a Request for Quotation (RFQ) for MPC9992AC 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 MPC9992AC reliable?

The price and inventory of MPC9992AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPC9992AC is usually 5 days.

3.What payment methods are accepted for MPC9992AC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPC9992AC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPC9992AC?

MPC9992AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPC9992AC 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 MPC9992AC?

For technical support, including MPC9992AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPC9992AC requirements.

6.How does Aetrix verify that MPC9992AC is sourced from the original manufacturer or authorized distributors?

All MPC9992AC 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 MPC9992AC meets industry standards.

7.What is the process for return or replacement of MPC9992AC?

All MPC9992AC units undergo pre-shipment inspection (PSI). If there is an issue with MPC9992AC, 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 MPC9992AC part is unused and in its original packaging.

Return procedure for MPC9992AC:

1.Submit a request within 90 days.

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

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