Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

NXP Semiconductors MC88915FN70R2

Name: MC88915FN70R2
Brand: NXP Semiconductors
SKU: MC88915FN70R2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MC88915FN70R2

Manufacturer:: NXP Semiconductors

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 28-LCC (J-Lead)

Datasheet:: MC88915FN70R2.pdf

Description:: IC CLOCK DRIVER 28PLCC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,908

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MC88915FN70R2 from Motorola is a phase-locked loop (PLL) clock driver IC designed for high-performance clock distribution in PC and workstation systems. It locks five low-skew Q outputs (Q0–Q4) to a reference clock with <500 ps output-to-output rising-edge skew, provides 2× and ÷2 frequency synthesis via 2X_Q and Q/2 outputs, and supports input frequencies up to 35 MHz (Q outputs) or 70 MHz (2X_Q output) under phase-locked operation.

For engineers reviewing the MC88915FN70R2 datasheet, MC88915FN70R2 pinout, MC88915FN70R2 application, or MC88915FN70R2 equivalent, this page delivers verified functional identity, PLL configuration options (1:2, 1:1, 2:1 frequency ratios), real-world test-mode behavior, package-specific drive capability (±36 mA), and validated alternative timing solutions for synchronous multi-board clocking architectures.

Technical Context

The MC88915FN70R2 implements a charge-pump PLL with voltage-controlled oscillator (VCO) optimized for 20–70 MHz operation, supporting three feedback configurations (Q/2, Qx, or 2X_Q) selected via FREQ_SEL to achieve input/output frequency ratios of 1:2, 1:1, or 2:1. Its dual SYNC inputs and REF_SEL pin enable flexible reference selection between two clock sources.

It features asynchronous reset (RST), PLL enable/disable (PLL_EN) for static test mode, lock detection (LOCK), and analog isolation via RC1-connected external resistor (470 kΩ or 1 MΩ) to control VCO current injection and minimize jitter. All outputs operate at CMOS/TTL-compatible levels with ±36 mA drive strength.

Key Specifications

Parameter	Value and Actual Design Meaning
2X_Q Max Frequency	70 MHz - defines maximum system clock frequency achievable when using 2X_Q output in PLL-locked mode
Q0–Q4 Max Frequency	35 MHz - maximum guaranteed operating frequency for primary clock outputs under 50 pF load
Output Skew (Q0–Q4 rising)	<500 ps - ensures tight timing alignment across five parallel clock domains on same board
Drive Strength	±36 mA - sufficient to directly drive multiple CMOS/TTL loads without external buffers
Input Compatibility	TTL-level - accepts standard 0.8 V / 2.0 V logic thresholds, simplifying interface with legacy controllers
Supply Voltage	5.0 V ±5% - requires stable single-rail digital supply; analog and digital VCC pins are internally isolated but share same rail
Lock Acquisition Time	1–10 ms - time required to achieve steady-state phase/frequency lock after valid SYNC input applied

Pinout & Package

MC88915FN70R2 is housed in a 28-lead plastic leaded chip carrier (PLCC), case 776–02, with dimensions 11.43 mm × 11.43 mm × 0.66–0.81 mm (R/U/H). The package integrates dedicated analog power (VCC(AN)/GND(AN)) and digital power (VCC/GND) pins for noise isolation, and includes RC1 for external loop filter connection.

Pin	Circuit Role	Design Meaning
SYNC[0], SYNC[1]	Reference clock inputs	Dual TTL-compatible clock inputs; REF_SEL selects active source - enables redundancy or dual-clock domain support
FREQ_SEL	Feedback divider select	Configures internal ÷1 or ÷2 division before clock distribution - determines achievable input frequency range (e.g., 5–35 MHz vs. 2.5–17.5 MHz)
FEEDBACK	PLL phase detector input	Accepts Q/2, Q0–Q4, Q5, or 2X_Q for closed-loop locking - sets final frequency ratio and phase relationship to SYNC
Q0–Q4	Main clock outputs	Five identical, phase-aligned CMOS/TTL outputs with <500 ps mutual skew - drive CPU, memory, or peripheral clocks synchronously
Q5	Inverted clock output	180° phase-shifted version of Q0–Q4 - used for differential clocking or complementary timing paths
2X_Q, Q/2	Frequency-scaled outputs	2X_Q runs at double Q frequency (up to 70 MHz); Q/2 runs at half Q frequency - enables mixed-speed subsystem clocking
LOCK	Phase-lock status indicator	Open-drain output asserted high during stable lock; not suitable for driving active circuitry - intended for passive monitoring only
RST	Asynchronous reset	Active-low signal resets all outputs immediately - used for system initialization or fault recovery
PLL_EN	PLL enable/disable control	Pulling low disables VCO and forces test mode - allows low-frequency board testing (<1 MHz) with no lock requirement

Key Features

Feature	Design Value
Programmable feedback ratio	FREQ_SEL pin selects ÷1 or ÷2 in PLL feedback path - extends usable input frequency range down to 2.5 MHz while keeping VCO in optimal 20+ MHz band
Multi-source clock selection	Two independent SYNC inputs + REF_SEL pin - supports failover clocking or dual-reference designs without external multiplexers
Test-mode clock division	With PLL_EN = low, Q outputs divide SYNC by 2 or 4 depending on FREQ_SEL - enables full functional test at sub-MHz ATE speeds
Analog-digital isolation	Dedicated VCC(AN)/GND(AN) pins + RC1-based loop filter - reduces supply-induced jitter to ≤100 ps per 100 mV VCC step
High-drive, level-flexible outputs	All Q, 2X_Q, Q/2, Q5 outputs deliver ±36 mA at CMOS levels - directly interfaces with TTL or CMOS loads without level-shifting or buffering

Applications

Workstation CPU Clock Distribution	Multi-Board Synchronous Timing
Use Scenario: Distributing a centralized 25 MHz system clock to multiple CPU cards and memory modules in a high-end workstation chassis. IC Role / Device Role / Timing Role: MC88915FN70R2 acts as a PLL-based clock fanout buffer, multiplying the 25 MHz reference to 50 MHz (2X_Q) for CPU cores while delivering phase-aligned 25 MHz (Q0–Q4) to memory controllers. Use Value: Achieves <500 ps skew across five Q outputs and <1.2 ns worst-case part-to-part skew - eliminates inter-board setup/hold violations in tightly synchronized multiprocessing systems.	Use Scenario: Synchronizing clock domains across separate CPU, I/O, and graphics boards in a modular computing platform. IC Role / Device Role / Timing Role: MC88915FN70R2 serves as a distributed PLL node, locking to a common backplane SYNC signal and regenerating local low-skew clocks for each board's subsystems. Use Value: Enables zero-delay, synchronous clock delivery across physically separated PCBs - critical for coherent cache protocols and time-sensitive interconnects like PCI or VME.
Legacy System Board Test Infrastructure	Embedded Controller Timing Subsystem
Use Scenario: Performing production-level functional testing of motherboard assemblies using low-speed automated test equipment (ATE). IC Role / Device Role / Timing Role: MC88915FN70R2 operates in PLL_EN-disabled test mode, generating divided-down clocks (e.g., Q outputs = ÷2 of 1 MHz test clock) for safe, non-locked validation. Use Value: Eliminates need for high-frequency ATE channels - allows full timing-path verification at ≤1 MHz while preserving output functionality and drive strength.	Use Scenario: Providing precise, scalable clocking for an industrial embedded controller managing motor drives, ADC sampling, and communication peripherals. IC Role / Device Role / Timing Role: MC88915FN70R2 functions as a programmable clock synthesizer, deriving 10 MHz (Q), 20 MHz (2X_Q), and 5 MHz (Q/2) from a single 10 MHz crystal oscillator input. Use Value: Reduces BOM count by replacing discrete oscillators and dividers - maintains <500 ps intra-chip skew across mixed-speed peripherals for deterministic real-time response.

Workstation CPU Clock Distribution

Multi-Board Synchronous Timing

Use Scenario: Distributing a centralized 25 MHz system clock to multiple CPU cards and memory modules in a high-end workstation chassis.

IC Role / Device Role / Timing Role: MC88915FN70R2 acts as a PLL-based clock fanout buffer, multiplying the 25 MHz reference to 50 MHz (2X_Q) for CPU cores while delivering phase-aligned 25 MHz (Q0–Q4) to memory controllers.

Use Value: Achieves <500 ps skew across five Q outputs and <1.2 ns worst-case part-to-part skew - eliminates inter-board setup/hold violations in tightly synchronized multiprocessing systems.

Use Scenario: Synchronizing clock domains across separate CPU, I/O, and graphics boards in a modular computing platform.

IC Role / Device Role / Timing Role: MC88915FN70R2 serves as a distributed PLL node, locking to a common backplane SYNC signal and regenerating local low-skew clocks for each board's subsystems.

Use Value: Enables zero-delay, synchronous clock delivery across physically separated PCBs - critical for coherent cache protocols and time-sensitive interconnects like PCI or VME.

Legacy System Board Test Infrastructure

Embedded Controller Timing Subsystem

Use Scenario: Performing production-level functional testing of motherboard assemblies using low-speed automated test equipment (ATE).

IC Role / Device Role / Timing Role: MC88915FN70R2 operates in PLL_EN-disabled test mode, generating divided-down clocks (e.g., Q outputs = ÷2 of 1 MHz test clock) for safe, non-locked validation.

Use Value: Eliminates need for high-frequency ATE channels - allows full timing-path verification at ≤1 MHz while preserving output functionality and drive strength.

Use Scenario: Providing precise, scalable clocking for an industrial embedded controller managing motor drives, ADC sampling, and communication peripherals.

IC Role / Device Role / Timing Role: MC88915FN70R2 functions as a programmable clock synthesizer, deriving 10 MHz (Q), 20 MHz (2X_Q), and 5 MHz (Q/2) from a single 10 MHz crystal oscillator input.

Use Value: Reduces BOM count by replacing discrete oscillators and dividers - maintains <500 ps intra-chip skew across mixed-speed peripherals for deterministic real-time response.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT5V2310APGI	LVCMOS output, 3.3 V supply, integrated LDO, no Q5 or Q/2 outputs; max Q frequency 100 MHz	Targets modern low-voltage systems; lacks inverted and divided outputs - requires external logic for Q5/Q/2 equivalents	Choose IDT5V2310APGI when migrating to 3.3 V architecture and higher-frequency (>35 MHz) Q outputs are required without analog PLL complexity.
ICS8302AM-01LFT	LVDS outputs, 3.3 V supply, fixed 1:1 and 2:1 ratios only, no FREQ_SEL or dual SYNC; max Q frequency 200 MHz	Optimized for high-speed serial links; incompatible TTL input levels and missing test-mode features limit legacy board reuse	Choose ICS8302AM-01LFT for new LVDS-based timing trees where ultra-low jitter (<0.3 ps) and >100 MHz operation outweigh need for TTL compatibility or test flexibility.

Compared with IDT5V2310APGI and ICS8302AM-01LFT, the MC88915FN70R2 uniquely supports 5 V TTL signaling, programmable feedback division, dual reference inputs, and dedicated test-mode operation - making it irreplaceable in legacy workstation and industrial control designs requiring robust, field-serviceable clock synchronization.

Availability

MC88915FN70R2 is available at Aetrix Electronics and suitable for workstation CPU clock distribution, multi-board synchronous timing, legacy system board test infrastructure, and embedded controller timing subsystems requiring stable component supply across extended product lifecycles.

Supply support for MC88915FN70R2 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 (now part of NXP Semiconductors) was a pioneering semiconductor manufacturer known for high-reliability timing, RF, and microcontroller products serving computing, automotive, and industrial markets.

The MC88915FN70R2 belongs to Motorola's TIMING SOLUTIONS product line, engineered specifically for low-skew, PLL-based clock distribution in high-performance computing platforms where synchronous multi-processor coordination and board-level testability were critical design requirements.

FAQ

What is the maximum input frequency supported by the MC88915FN70R2 in phase-locked operation?

The MC88915FN70R2 supports a maximum input (SYNC) frequency of 35 MHz when configured for 1:1 Q-output ratio with FREQ_SEL high, or up to 70 MHz when using 2X_Q as feedback source. These limits assume proper loop filter design, 50 pF load, and operation within 0°C to +70°C ambient temperature. The VCO must remain within its optimal 20–70 MHz range for stable lock.

How does the FREQ_SEL pin affect the MC88915FN70R2's frequency multiplication capabilities?

The FREQ_SEL pin selects between ÷1 and ÷2 division in the PLL feedback path before the clock distribution network. When high, it enables direct 1:1, 2:1, or 1:2 input-to-Q-output ratios. When low, it halves the effective feedback frequency, allowing lower SYNC inputs (down to 2.5 MHz) while maintaining VCO operation above 20 MHz - essential for extending low-frequency applicability without sacrificing jitter performance.

Can the MC88915FN70R2 generate an inverted clock output, and how is it used?

Yes, the MC88915FN70R2 provides Q5 - a dedicated inverted (180° phase-shifted) version of the Q0–Q4 outputs. Q5 is electrically identical in drive strength and timing skew but inverted in polarity. It is used for complementary clocking in differential receiver interfaces, edge-triggered latch control, or generating non-overlapping timing signals in memory or bus arbitration circuits.

What is the purpose of the RC1 pin on the MC88915FN70R2, and what value resistor should be used?

The RC1 pin connects to an external reference resistor that injects current into the PLL's charge pump, establishing VCO bias and minimizing dead-band jitter. A 470 kΩ resistor is recommended for VCO frequencies ≥40 MHz (e.g., 2X_Q ≥70 MHz), while a 1 MΩ resistor is specified for VCO frequencies <40 MHz to maintain optimal loop stability and phase accuracy across process/voltage/temperature variations.

Is the LOCK output of the MC88915FN70R2 suitable for controlling downstream logic?

No - the LOCK output of the MC88915FN70R2 is explicitly designated for passive monitoring or evaluation only. Motorola's datasheet warns that LOCK may remain low even during valid phase lock under certain conditions, and prohibits its use to drive active circuitry. It should be observed via scope or logic analyzer, not connected to enable/disable inputs of other devices.

MC88915FN70R2 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:: 70MHz

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)

MC88915FN70R2 FAQ

1.How can I place an order for MC88915FN70R2 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC88915FN70R2 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 MC88915FN70R2 reliable?

The price and inventory of MC88915FN70R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC88915FN70R2 is usually 5 days.

3.What payment methods are accepted for MC88915FN70R2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC88915FN70R2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC88915FN70R2?

MC88915FN70R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC88915FN70R2 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 MC88915FN70R2?

For technical support, including MC88915FN70R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC88915FN70R2 requirements.

6.How does Aetrix verify that MC88915FN70R2 is sourced from the original manufacturer or authorized distributors?

All MC88915FN70R2 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 MC88915FN70R2 meets industry standards.

7.What is the process for return or replacement of MC88915FN70R2?

All MC88915FN70R2 units undergo pre-shipment inspection (PSI). If there is an issue with MC88915FN70R2, 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 MC88915FN70R2 part is unused and in its original packaging.

Return procedure for MC88915FN70R2:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…