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NXP Semiconductors MPC9109AC
- Part No.:
- MPC9109AC
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Clock/Timing
- Package:
- 32-LQFP
- Datasheet:
-
MPC9109AC.pdf
- Description:
- IC CLOCK DIST CHIP 1:18 32-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
MPC9109AC from Freescale Semiconductor is a low-voltage 1:18 clock distribution IC with dual-supply flexibility (2.5 V or 3.3 V core and output), LVPECL/LVCMOS selectable input, 18 LVCMOS outputs, 200 ps max output-to-output skew at 3.3 V, and 250 MHz max input frequency - deployed in Pentium II™-based synchronous systems requiring precise clock fanout.
For engineers reviewing the MPC9109AC datasheet, MPC9109AC pinout, MPC9109AC application, or MPC9109AC equivalent, key selection criteria include input interface compatibility (LVPECL vs. LVCMOS), output voltage configuration (2.5 V/3.3 V), skew budget for high-speed timing closure, drive strength for 50 Ω terminated lines, and QFP package footprint constraints in dense PCB layouts.
Technical Context
The MPC9109AC implements a single-stage buffer architecture with independent input selection logic: LVCMOS_CLK_Sel = HIGH selects LVCMOS input; LOW selects differential LVPECL input. All inputs feature internal pullup/pulldown resistors, enabling unused pins to float safely.
It supports three supply configurations: (1) 3.3 V VCCI + 3.3 V VCCO, (2) 3.3 V VCCI + 2.5 V VCCO, and (3) 2.5 V VCCI + 2.5 V VCCO - with corresponding AC performance trade-offs: 250 MHz max frequency at 3.3 V outputs, 200 MHz at 2.5 V outputs, and output skew increasing from 200 ps to 250 ps when operating at 2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Interface | Selectable LVPECL or LVCMOS via LVCMOS_CLK_Sel pin - enables direct interfacing with MC100EP111 fanout buffers or standard CMOS clocks. |
| Output Count & Type | 18 LVCMOS outputs - each capable of driving two 50 Ω series-terminated lines due to ≈20–23 Ω output impedance. |
| Output-to-Output Skew | 200 ps maximum at 3.3 V outputs - ensures tight timing alignment across all 18 outputs in high-speed synchronous designs. |
| Max Input Frequency | 250 MHz at 3.3 V supply - supports clock distribution for Pentium II™ and similar high-performance microprocessors. |
| Supply Flexibility | Dual-supply operation: VCCI (core) and VCCO (I/O) independently set to 2.5 V or 3.3 V - allows mixed-voltage system integration. |
| Package | 32-lead Pb-free LQFP (7×7 mm, 0.8 mm pitch, Case 873A-04) - surface-mount compatible with standard reflow profiles. |
Pinout & Package
Package: 32-lead LQFP (Leadless Quad Flat Package), 7 mm × 7 mm body, 0.8 mm lead pitch, Pb-free (AC suffix), Case 873A-04.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 | See functional mapping below | Pin numbering follows standard TQFP top-view convention per Figure 2 in datasheet Rev. 2. |
| LVCMOS_CLK (Pin 1) | LVCMOS clock input | Active when LVCMOS_CLK_Sel = HIGH; accepts 2.5 V/3.3 V CMOS-level signals. |
| PECL_CLK (Pins 2 & 3) | Differential LVPECL clock input | True differential pair - requires AC-coupled termination; common-mode range VCC–1.4 V to VCC–0.6 V. |
| LVCMOS_CLK_Sel (Pin 4) | Input select control | Logic HIGH selects LVCMOS_CLK; LOW selects PECL_CLK; internal pulldown ensures default LVPECL mode if left open. |
| VCCI (Pins 5, 25) | Core supply voltage | Supplies internal logic; configurable for 2.5 V or 3.3 V ±5% - determines propagation delay and max frequency. |
| VCCO (Pins 6, 26, 27, 28, 29, 30, 31, 32) | I/O supply voltage | Supplies all 18 outputs; independently set to 2.5 V or 3.3 V - defines VOH/VOL levels and drive strength. |
| GND (Pins 7, 19, 20) | Ground reference | System ground return for core logic; separate GNDO pins isolate output ground paths to minimize noise coupling. |
| GNDO (Pins 8, 18, 21, 22, 23, 24) | Output ground | Dedicated ground for output drivers - improves signal integrity on high-speed LVCMOS outputs. |
| Q0–Q17 (Pins 9–17, 32) | LVCMOS clock outputs | 18 buffered outputs; each drives 50 Ω series-terminated lines with <1.3 ns rise/fall time and 200–250 ps skew. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable input interface | Hardware-selectable LVPECL or LVCMOS input eliminates need for external level-shifting circuitry in mixed-signal clock trees. |
| Low-output-impedance drivers | ≈20–23 Ω output impedance enables direct drive of two 50 Ω series-terminated lines per output - achieving effective 1:36 fanout. |
| Tight output skew control | 200 ps max output-to-output skew at 3.3 V ensures deterministic timing margins in multi-processor or memory subsystem clocking. |
| Flexible dual-supply architecture | Independent VCCI and VCCO rails allow coexistence with 2.5 V I/O domains while maintaining 3.3 V core logic speed and stability. |
| Internal biasing for unused inputs | All digital inputs include factory-trimmed pullup/pulldown resistors - simplifies board design by eliminating external bias components. |
Applications
| Pentium II™ Microprocessor Clocking | High-Density Synchronous Memory Subsystem |
|---|---|
|
Use Scenario: Distributing a single high-frequency system clock to CPU core, cache, and front-side bus logic in Pentium II™-based workstations. IC Role / Device Role / Timing Role: Primary 1:18 clock fanout buffer providing low-skew, 2.5 V LVCMOS clocks synchronized to CPU core timing requirements. Use Value: Enables full 250 MHz operation with 200 ps skew - meeting Pentium II™ setup/hold timing budgets without additional deskew circuitry. |
Use Scenario: Driving clock inputs of multiple DDR SDRAM banks and memory controller interfaces in telecom baseband cards. IC Role / Device Role / Timing Role: Central clock distribution node delivering matched-phase clocks to 18 memory devices across a compact PCB area. Use Value: 200 ps skew and 50 Ω line drive capability ensure simultaneous latching across all memory ranks, reducing timing margin erosion. |
| Multi-Core DSP Clock Tree | Industrial PLC Real-Time Control Module |
|
Use Scenario: Feeding synchronized clocks to four TMS320C6000-series DSPs and their associated peripherals in radar signal processing hardware. IC Role / Device Role / Timing Role: Low-jitter, low-skew clock distributor supporting deterministic inter-DSP communication and sample alignment. Use Value: 250 MHz capability and 200 ps skew preserve phase coherence across parallel processing paths critical for beamforming algorithms. |
Use Scenario: Providing deterministic clock signals to FPGA-based motion control logic, ADC sampling engines, and isolated I/O timing blocks. IC Role / Device Role / Timing Role: Robust clock source with dual-supply support (2.5 V/3.3 V) for mixed-voltage industrial control ASICs and FPGAs. Use Value: Internal input biasing and wide supply tolerance (±5%) ensure reliable startup and operation in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock distribution applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPC940L | Higher-performance variant: 150 ps skew, 350 MHz max frequency, same 32-lead LQFP package. | Targeted at next-generation Pentium III™ and RISC processor platforms requiring tighter skew and higher bandwidth. | Select MPC940L when 200 ps skew is insufficient and board layout allows same footprint with improved specs. |
| MPC942 | Lower-output-impedance version: ≈12 Ω outputs - optimized for driving four 50 Ω lines per output (1:72 effective fanout). | Used where ultra-high fanout is required without intermediate buffering, e.g., large-scale FPGA clock trees. | Choose MPC942 only if fanout >18 is needed and lower impedance is verified compatible with target load topology. |
Compared with MPC9109AC, MPC940L delivers superior skew and frequency headroom in identical packaging, while MPC942 trades skew control for higher fanout density - making MPC9109AC the optimal balance for mainstream Pentium II™ and industrial synchronous systems.
Availability
MPC9109AC is available at Aetrix Electronics and suitable for Pentium II™-based computing platforms, high-density memory subsystems, multi-core DSP signal processors, and industrial real-time control modules requiring stable component supply and long-lifecycle support.
Supply support for MPC9109AC 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
Freescale Semiconductor was a leading designer of embedded processors, analog, and mixed-signal semiconductors, later acquired by NXP Semiconductors in 2015.
The MPC9109AC belongs to Freescale's Advanced Clock Drivers Devices family, engineered specifically for low-skew, high-fanout clock distribution in performance-critical computing and communications infrastructure.
FAQ
What input voltage levels does the MPC9109AC support?
The MPC9109AC supports two distinct input interfaces: LVCMOS input accepts 2.5 V or 3.3 V logic levels (VIH ≥ 2.0 V at 2.5 V VCCI; ≥2.4 V at 3.3 V VCCI), while the differential LVPECL input operates with 500–1000 mV peak-to-peak swing and common-mode range of VCC–1.4 V to VCC–0.6 V. The MPC9109AC input selection is controlled solely by the LVCMOS_CLK_Sel pin state.
Does the MPC9109AC require external pull-up or pull-down resistors on its inputs?
No - the MPC9109AC integrates internal pullup and pulldown resistors on all digital inputs, including LVCMOS_CLK_Sel, LVCMOS_CLK, and the PECL_CLK differential pair bias network. This eliminates the need for external biasing components and allows unused inputs to remain unconnected without floating states.
What is the maximum clock frequency supported by the MPC9109AC under different supply conditions?
The MPC9109AC supports up to 250 MHz maximum input frequency when both VCCI and VCCO are supplied at 3.3 V, 250 MHz at 3.3 V VCCI with 2.5 V VCCO, and 200 MHz when both supplies are set to 2.5 V. These values are specified in Tables 5, 8, and 11 of the Rev. 2 datasheet and reflect guaranteed AC performance limits.
Can the MPC9109AC drive 50 Ω transmission lines directly without external series termination?
Yes - the MPC9109AC features a low output impedance of approximately 20–23 Ω in both HIGH and LOW states, enabling direct drive of two 50 Ω series-terminated lines per output (i.e., 100 Ω total load). This design eliminates the need for external series resistors in properly terminated point-to-point or daisy-chain topologies.
Is the MPC9109AC pin-compatible with the MPC940L or MPC942?
No - although the MPC9109AC, MPC940L, and MPC942 share the same 32-lead LQFP package (Case 873A-04), their pin functions differ significantly: MPC940L replaces LVCMOS_CLK_Sel with a test-enable function, and MPC942 reassigns several power and ground pins to accommodate lower-impedance drivers. Therefore, MPC9109AC is not a drop-in replacement for either part.
MPC9109AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- PLL:
- No
- Main Purpose:
- Intel CPU Servers
- Input:
- LVCMOS, LVPECL
- Output:
- LVCMOS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:18
- Differential - Input:Output:
- Yes/No
- Frequency - Max:
- 250MHz
- Voltage - Supply:
- 2.375V ~ 3.465V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-LQFP (7x7)
MPC9109AC FAQ
1.How can I place an order for MPC9109AC through Aetrix?
Please submit a Request for Quotation (RFQ) for MPC9109AC 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 MPC9109AC reliable?
The price and inventory of MPC9109AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPC9109AC is usually 5 days.
3.What payment methods are accepted for MPC9109AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPC9109AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPC9109AC?
MPC9109AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPC9109AC 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 MPC9109AC?
For technical support, including MPC9109AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPC9109AC requirements.
6.How does Aetrix verify that MPC9109AC is sourced from the original manufacturer or authorized distributors?
All MPC9109AC 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 MPC9109AC meets industry standards.
7.What is the process for return or replacement of MPC9109AC?
All MPC9109AC units undergo pre-shipment inspection (PSI). If there is an issue with MPC9109AC, 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 MPC9109AC part is unused and in its original packaging.
Return procedure for MPC9109AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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