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NXP Semiconductors MC88915TFN100R2
- Part No.:
- MC88915TFN100R2
- Manufacturer:
- NXP Semiconductors
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
MC88915TFN100R2.pdf
- Description:
- IC CLOCK DRIVER 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,370
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Product details
Overview
MC88915TFN100R2 from Motorola is a 5V, low-skew PLL clock driver IC designed for synchronous clock distribution in high-performance computing systems. It locks five Q outputs (Q0–Q4) and an inverted Q5 output to a reference clock with <500 ps rising-edge skew, supports 2× and ½× frequency multiplication/division via internal PLL, and delivers 100 MHz on the 2X_Q output - validated for use in PC/workstation motherboard timing subsystems.
For engineers reviewing the MC88915TFN100R2 datasheet, MC88915TFN100R2 pinout, MC88915TFN100R2 application, or MC88915TFN100R2 equivalent, key selection criteria include guaranteed 100 MHz 2X_Q operation under phase-locked conditions, FREQ_SEL programmable feedback division, OE/RST 3-state control, LOCK status indication, and compatibility with 50 Ω terminated CMOS/TTL loads.
Technical Context
The MC88915TFN100R2 implements a voltage-controlled oscillator (VCO) locked to a SYNC input via a feedback path configurable through the FREQ_SEL pin (÷1 or ÷2), enabling input/output frequency ratios of 2:1, 1:1, or 1:2. Its PLL architecture ensures zero-delay distribution of synchronized clocks across multiple board locations when cascaded with other MC88915T devices.
All seven outputs - Q0–Q4, Q5 (180° inverted), 2X_Q (2× Q-frequency), and Q/2 (½× Q-frequency) - are driven at ±36 mA with CMOS-level swing and TTL-compatible inputs. The LOCK output asserts high within 10 ms of valid SYNC acquisition and drops low upon loss of lock or PLL_EN deactivation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| 2X_Q Max Frequency | 100 MHz - guaranteed operating frequency for doubled-output channel under phase-locked, 50 Ω terminated conditions |
| Q0–Q4/Q5 Max Frequency | 50 MHz - maximum stable output frequency for primary buffered clock outputs |
| Output-to-Output Skew (Rising) | <500 ps - ensures tight timing alignment between Q0–Q4 and Q/2 edges for synchronous logic domains |
| Supply Voltage | 5.0 V ±5% - single-rail operation compatible with legacy 5V system power domains |
| Output Drive Strength | ±36 mA - sufficient to drive 50 Ω transmission lines directly without external buffers |
| Lock Acquisition Time | 1.0–10 ms - time from valid SYNC edge to stable LOCK assertion, critical for boot-time clock initialization |
| Input Compatibility | TTL-level - accepts standard 0.8 V / 2.0 V logic thresholds without level-shifting circuitry |
Pinout & Package
MC88915TFN100R2 is housed in a 28-lead PLCC (Plastic Leaded Chip Carrier), case 776–02, with gull-wing leads and body dimensions of 11.51 mm × 11.51 mm × 3.56 mm. Thermal and mechanical data conform to Motorola's FN suffix specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | 5 V analog/digital supply rail; decoupling required per Motorola layout guidelines |
| GND | Ground Reference | Common return for all I/O and internal circuitry; separate analog/digital grounding not required |
| SYNC0 / SYNC1 | Reference Clock Input | Dual-input capability enables redundancy or test-mode clock injection; only one used in normal operation |
| FEEDBACK | PLL Feedback Input | Accepts selected output (Q0–Q4, Q5, Q/2, or 2X_Q) to close PLL loop; determines frequency ratio |
| FREQ_SEL | Feedback Divider Control | High = ÷1, Low = ÷2 in feedback path; enables VCO operation >20 MHz with low-frequency SYNC inputs |
| PLL_EN | PLL Enable | High = active PLL lock mode; Low = static test mode with unrestricted input frequency range |
| OE/RST | Output Enable / Reset | Low = 3-state all outputs; rising edge resets Q0–Q4/Q5/Q/2 to low, 2X_Q to inverse of selected SYNC |
| LOCK | Phase-Lock Status Indicator | Open-drain CMOS output; high = steady-state lock achieved; low = unlocked or PLL disabled |
| Q0–Q4 | Primary Clock Outputs | Five identical, low-skew buffered clocks phase- and frequency-locked to SYNC input |
| Q5 | Inverted Clock Output | 180° phase-shifted version of Q0–Q4; useful for differential clocking or complementary logic timing |
| 2X_Q | Doubled-Frequency Output | Runs at twice the Q-output frequency; supports higher-speed subsystems (e.g., CPU P-clock) |
| Q/2 | Halved-Frequency Output | Runs at half the Q-output frequency; provides lower-speed peripheral clock domains |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Feedback Division | FREQ_SEL pin selects ÷1 or ÷2 in PLL feedback path, enabling optimal VCO operation (>20 MHz) across wide SYNC input ranges |
| Multi-Output Frequency Synthesis | Simultaneous generation of 2×, 1×, ½×, and inverted (180°) clock outputs from single reference - eliminates need for discrete dividers/multipliers |
| Sub-nanosecond Output Alignment | <500 ps skew between Q0–Q4 rising edges ensures deterministic timing for multi-processor or multi-chip sync |
| Board-Level Test Support | PLL_EN and dual SYNC inputs enable low-frequency functional testing; OE/RST allows full output disable for boundary-scan or ICT |
| Robust Load Driving | ±36 mA CMOS drive strength guarantees clean 50 Ω transmission-line switching without external buffers or termination resistors |
Applications
| PC Motherboard Clock Distribution | Workstation Multi-CPU Synchronization |
|---|---|
|
Use Scenario: Distributing a central 50 MHz reference to CPU, chipset, memory controller, and PCI bus logic on a high-density ATX motherboard. IC Role / Device Role / Timing Role: Primary PLL-based clock fanout device generating synchronized Q0–Q4 clocks and 2X_Q for CPU P-clock domain. Use Value: Eliminates inter-chip skew accumulation; guarantees <500 ps alignment between CPU and chipset clocks for reliable 100 MHz front-side bus operation. |
Use Scenario: Providing phase-coherent clocks to dual Pentium Pro processors and shared L2 cache controller in symmetric multiprocessing (SMP) workstations. IC Role / Device Role / Timing Role: Master clock generator feeding identical Q outputs to both CPUs while using Q5 for complementary timing paths. Use Value: Enables true cycle-accurate instruction execution across CPUs by maintaining sub-500 ps inter-processor clock skew under thermal/voltage variation. |
| Legacy Embedded Controller Timing | Industrial Data Acquisition Backplane |
|
Use Scenario: Generating 25 MHz system clock and 50 MHz ADC sampling clock from a 25 MHz crystal oscillator in an industrial PLC controller. IC Role / Device Role / Timing Role: PLL-based frequency translator producing Q/2 (25 MHz) and 2X_Q (50 MHz) from same SYNC source. Use Value: Reduces BOM count by replacing discrete crystal oscillator + divider + buffer chain with single integrated solution. |
Use Scenario: Synchronizing distributed DAQ modules across a 16-slot VME backplane requiring precise sample alignment across 32 channels. IC Role / Device Role / Timing Role: Central clock hub distributing phase-locked Q outputs to each slot via daisy-chained FEEDBACK routing. Use Value: Achieves <750 ps worst-case skew (2X_Q to Q5) across entire backplane, meeting IEEE 1149.4 mixed-signal test timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PLL clock driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC88LV915T | 3.3 V supply variant; identical pinout and function but incompatible voltage domain; no 5 V tolerance | Requires redesign of power delivery and level-shifting for 3.3 V systems; unsuitable for direct 5 V replacement | Select MC88LV915T only when migrating to 3.3 V infrastructure; verify all connected loads accept 3.3 V logic levels. |
| ICS557GI-100 | 100 MHz max 2X_Q; 3.3 V supply; integrated spread-spectrum option; different pinout and register interface | Supports EMI reduction via SS modulation; lacks OE/RST 3-state and dual SYNC inputs for test flexibility | Choose ICS557GI-100 for noise-sensitive applications where spread spectrum is mandatory; accept layout change and firmware adaptation. |
Compared with MC88LV915T and ICS557GI-100, the MC88915TFN100R2 uniquely supports 5 V operation with full test-mode features (dual SYNC, PLL_EN, OE/RST), making it irreplaceable in legacy high-reliability computing platforms where voltage compatibility and board-level debug access are non-negotiable.
Availability
MC88915TFN100R2 is available at Aetrix Electronics and suitable for PC motherboard design, workstation SMP synchronization, industrial PLC timing, and VME backplane clock distribution requiring stable component supply across extended product lifecycles.
Supply support for MC88915TFN100R2 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
Motorola Semiconductor (now part of NXP Semiconductors) pioneered high-performance clock distribution ICs for computing infrastructure in the 1990s, emphasizing low skew, PLL stability, and robust manufacturability.
The MC88915T family was engineered specifically for synchronous clock fanout in 5 V PC and workstation platforms, addressing timing integrity challenges in multi-chip, high-speed digital systems before widespread adoption of differential signaling.
FAQ
What is the maximum guaranteed operating frequency of the 2X_Q output for MC88915TFN100R2?
The MC88915TFN100R2 guarantees a 100 MHz maximum operating frequency on the 2X_Q output when operating in phase-locked mode with all outputs loaded into 50 Ω terminations referenced to VCC/2. This rating is validated across –40°C to +85°C and 5.0 V ±5% supply conditions per Motorola's FREQUENCY SPECIFICATIONS table for the TFN100 variant.
How does the FREQ_SEL pin affect the PLL behavior of MC88915TFN100R2?
The FREQ_SEL pin configures the feedback divider ratio inside the MC88915TFN100R2 PLL: high selects ÷1, low selects ÷2. When FREQ_SEL is low, the VCO runs at double the feedback signal frequency, allowing stable lock with lower-frequency SYNC inputs (e.g., 5–25 MHz) while keeping the VCO within its optimal 20–100 MHz range - critical for jitter performance and startup reliability.
Can MC88915TFN100R2 drive 50 Ω transmission lines directly without external termination?
Yes, the MC88915TFN100R2 can drive 50 Ω transmission lines directly: its ±36 mA output drive strength and CMOS-level voltage swing (VOH ≥ 4.01 V, VOL ≤ 0.44 V at ±36 mA) meet the requirements for incident-wave switching into 50 Ω loads terminated to VCC/2. Motorola's PD1 and PD2 power dissipation data confirm this capability is characterized and supported.
What happens to the outputs of MC88915TFN100R2 when OE/RST is pulled low?
When OE/RST is pulled low, all outputs - 2X_Q, Q0–Q4, Q5, and Q/2 - enter a high-impedance (3-state) condition. Upon returning OE/RST high, Q0–Q4 and Q5 reset to logic low, Q/2 resets to low, and 2X_Q assumes the inverse state of the selected SYNC input - ensuring deterministic startup behavior and eliminating glitches during power sequencing or hot-plug events.
Is MC88915TFN100R2 compatible with TTL-level input signals?
Yes, MC88915TFN100R2 accepts TTL-level inputs: VIH is specified at ≥2.0 V and VIL at ≤0.8 V over temperature and supply, matching standard TTL logic thresholds. This allows direct interfacing with legacy 5 V microcontrollers, FPGAs, and bus transceivers without level-shifting circuitry - a key design simplification confirmed in the DC ELECTRICAL CHARACTERISTICS table.
MC88915TFN100R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock Driver, Fanout Distribution, Multiplexer
- PLL:
- Yes
- Input:
- TTL
- Output:
- CMOS, TTL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 3:8
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 100MHz
- Divider/Multiplier:
- Yes/Yes
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
MC88915TFN100R2 FAQ
1.How can I place an order for MC88915TFN100R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC88915TFN100R2 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 MC88915TFN100R2 reliable?
The price and inventory of MC88915TFN100R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC88915TFN100R2 is usually 5 days.
3.What payment methods are accepted for MC88915TFN100R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC88915TFN100R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC88915TFN100R2?
MC88915TFN100R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC88915TFN100R2 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 MC88915TFN100R2?
For technical support, including MC88915TFN100R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC88915TFN100R2 requirements.
6.How does Aetrix verify that MC88915TFN100R2 is sourced from the original manufacturer or authorized distributors?
All MC88915TFN100R2 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 MC88915TFN100R2 meets industry standards.
7.What is the process for return or replacement of MC88915TFN100R2?
All MC88915TFN100R2 units undergo pre-shipment inspection (PSI). If there is an issue with MC88915TFN100R2, 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 MC88915TFN100R2 part is unused and in its original packaging.
Return procedure for MC88915TFN100R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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