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NXP Semiconductors MC88916DW80
- Part No.:
- MC88916DW80
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Clock/Timing
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC88916DW80.pdf
- Description:
- IC CLK BUF CISC 80MHZ 1CIRC
- Quantity:
- Payment:
- Shipping:
Inventory:3,616
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Product details
Overview
MC88916DW80 from Freescale Semiconductor (formerly Motorola) is a low-skew CMOS PLL clock driver designed for precise clock distribution in 68040-based RISC systems. It delivers phase- and frequency-locked Q0–Q2 outputs at up to 40 MHz, 2X_Q output at 80 MHz, ±36 mA drive strength per output, and integrated processor reset logic for MC68040 microprocessors.
For engineers reviewing the MC88916DW80 datasheet, MC88916DW80 pinout, MC88916DW80 application, or MC88916DW80 equivalent, this page provides verified timing specifications, reset functionality details, skew performance data, SOIC-20 package layout, and validated alternatives for 68030/040 clocking designs.
Technical Context
The MC88916DW80 implements a charge-pump PLL with internal feedback to generate fixed 2× multiplication from SYNC input to 2X_Q output and ÷2 division to Q/2 output. Its VCO operates at 2× the Q-output frequency, with no external feedback pin - all frequency relationships are hardwired.
It integrates dual-function RST_IN/RST_OUT(LOCK) pins: RST_IN triggers a 1024-cycle Q-output reset pulse on RST_OUT(LOCK), while RST_OUT also serves as an open-drain phase-lock indicator. PLL_EN enables static test mode by disabling the VCO when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max 2X_Q Output Frequency | 80 MHz - supports 40 MHz 68040 PCLK input with compliant duty cycle |
| Max Q0–Q2/Q3 Output Frequency | 40 MHz - drives 68040 system clocks and BCLK inputs directly |
| Output-to-Output Skew (Q0–Q2 rising) | <500 ps - ensures synchronous timing across three primary clock domains |
| SYNC Input Frequency Range | 5 MHz to 20 MHz - accommodates crystal or oscillator sources feeding 2X_Q = 80 MHz |
| Output Drive Strength | ±36 mA - sufficient to drive CMOS/TTL loads without external buffers |
| Phase Variation (SYNC to Q outputs) | <600 ps part-to-part - guarantees consistent board-level timing margin |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL/CMOS logic rails |
Pinout & Package
MC88916DW80 is housed in a 20-lead wide SOIC package (Case 751D–04, DW suffix), measuring 12.65 mm × 7.40 mm × 2.35 mm, with gull-wing leads and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Digital ground reference for core logic and output drivers |
| 2 | Q3 | Inverted (180° phase shift) version of Q0–Q2 outputs |
| 3 | 2X_Q | Double-frequency output (80 MHz max); not duty-cycle-compliant for low-frequency 68040 PCLK |
| 4 | VCC | Digital power supply (5 V); four VCC pins total (pins 4, 7, 13, 19) |
| 5 | Q/2 | Divide-by-two output (20 MHz at 40 MHz Q); internally fed back to enable fixed 2× multiplication |
| 6 | MR | Master reset input - asynchronous high-to-low pulse resets all outputs |
| 7 | VCC | Digital power supply (5 V) |
| 8 | RST_IN | Processor reset trigger input - toggling low initiates 1024-cycle Q-output reset pulse on RST_OUT |
| 9 | Q2 | Primary buffered clock output (40 MHz max), phase-locked to SYNC |
| 10 | VCC(AN) | Analog power supply - shared with digital VCC; no separate analog rail required |
| 11 | GND | Analog ground - isolated via PCB layout per recommended analog/digital partitioning |
| 12 | RC1 | Reference current pin - connects to 1 MΩ resistor for stable PLL operation and jitter suppression |
| 13 | RST_OUT(LOCK) | Open-drain phase-lock indicator and reset output - requires external pull-up; asserts low until lock, then pulses low on RST_IN toggle |
| 14 | GND(AN) | Analog ground - dedicated pin for analog section return path |
| 15 | PLL_EN | PLL enable input - high enables normal operation; low disables VCO for static low-frequency board testing |
| 16 | SYNC | Reference clock input - accepts 5–20 MHz TTL-level signal; rise/fall time ≤5 ns |
| 17 | Q1 | Primary buffered clock output (40 MHz max), phase-locked to SYNC |
| 18 | GND | Digital ground |
| 19 | VCC | Digital power supply (5 V) |
| 20 | Q0 | Primary buffered clock output (40 MHz max), phase-locked to SYNC |
Key Features
| Feature | Design Value |
|---|---|
| Low-skew triple-Q output bank | Q0–Q2 outputs with <500 ps rising-edge skew - enables tightly synchronized multi-bus timing in 68040 systems |
| Integrated processor reset logic | RST_IN/RST_OUT(LOCK) provides 1024-cycle Q-output reset pulse - meets MC68040 reset timing requirements without external counters |
| Fixed-ratio PLL architecture | No external feedback path needed - simplifies layout and eliminates loop filter tuning for 2× and ÷2 outputs |
| Test-mode support | PLL_EN pin disables VCO for static low-frequency functional testing - avoids PLL lock dependency during board validation |
| Robust drive capability | ±36 mA per output - directly drives 50 Ω terminated lines or multiple CMOS/TTL inputs without fanout buffers |
| Phase-lock status indication | RST_OUT(LOCK) doubles as open-drain lock indicator - allows system firmware to poll lock status before releasing CPU reset |
Applications
| 68040-Based Workstation Motherboard | 68030 Industrial Control CPU Board |
|---|---|
Use Scenario: Clock distribution for 40 MHz 68040 CPU, BCLK, and peripheral buses on a multi-layer workstation motherboard. IC Role / Device Role / Timing Role: Primary clock generator and distributor - generates Q0–Q2 for CPU core, Q3 for bus arbitration, and 2X_Q for PCLK with verified 45–55% duty cycle. Use Value: Eliminates need for discrete clock buffers and external PLL tuning components; meets 68040 PCLK setup/hold and duty cycle specs at full speed. |
Use Scenario: Synchronizing memory controller, DMA engine, and serial interface on a ruggedized 33 MHz 68030 control board operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Low-jitter clock source - delivers Q0–Q2 at 33 MHz with <500 ps skew to ensure deterministic bus arbitration and memory access timing. Use Value: Guarantees sub-nanosecond inter-clock alignment across temperature extremes, reducing timing closure risk in industrial real-time systems. |
| Legacy Embedded Test Equipment | Multi-Processor 68040 System |
Use Scenario: Replacing aging crystal oscillators and discrete logic in automated test equipment requiring field-upgradable clock rates. IC Role / Device Role / Timing Role: Programmable clock source via SYNC input - supports 5–20 MHz reference inputs to generate fixed 2× and ÷2 derived clocks without hardware changes. Use Value: Enables software-selectable test frequencies (e.g., 16.5 MHz → 33 MHz Q outputs) while maintaining traceable phase alignment across all outputs. |
Use Scenario: Coordinating clock domains across two 68040 CPUs sharing memory and I/O in a symmetric multiprocessing configuration. IC Role / Device Role / Timing Role: Synchronized clock hub - uses single SYNC source to lock both MC88916DW80 devices, minimizing inter-processor skew via matched tPD paths. Use Value: Achieves <1 ns worst-case inter-device Q-output skew using identical loop filter design and board layout - critical for cache coherency protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC88916DW70 | Lower 2X_Q max frequency (70 MHz) and Q-output max frequency (35 MHz) | Suitable only for 33 MHz 68040 or 68030 systems; cannot meet 40 MHz 68040 PCLK timing | Select MC88916DW70 only when target system clock rate is ≤35 MHz and cost sensitivity outweighs future upgrade headroom |
| MC88920DW | Dedicated 68040 PCLK/BCLK driver with optimized 2X_Q duty cycle and lower jitter; lacks Q/2 and RST_OUT(LOCK) functionality | Designed specifically for low-frequency 68040 variants where strict PCLK duty cycle compliance is mandatory | Choose MC88920DW when 68040 PCLK must meet 40–60% duty cycle over full temperature range - MC88916DW80 does not guarantee this for sub-33 MHz operation |
Compared with MC88916DW70, the MC88916DW80 enables higher-performance 40 MHz 68040 systems without layout changes; compared with MC88920DW, it offers broader feature integration (reset logic, ÷2 output, test mode) at the expense of PCLK duty cycle guarantees below 33 MHz.
Availability
MC88916DW80 is available at Aetrix Electronics and suitable for 68040 workstation motherboards, 68030 industrial controllers, legacy test equipment upgrades, multi-processor synchronization, and embedded timing-critical applications requiring stable component supply and long-lifecycle support.
Supply support for MC88916DW80 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 (originally Motorola Semiconductor) is a U.S.-based semiconductor company specializing in embedded processing, analog, and power management solutions for automotive, industrial, and communications markets.
The MC88916DW80 belongs to Freescale's legacy Timing Solutions product line, engineered specifically to simplify clock tree design in Motorola 68K-family microprocessor systems with integrated PLL, reset, and skew management.
FAQ
What is the maximum guaranteed operating frequency of the 2X_Q output on the MC88916DW80?
The MC88916DW80 guarantees a maximum 2X_Q output frequency of 80 MHz under phase-locked conditions with all outputs loaded at 50 Ω terminated to VCC/2. This rating is explicitly specified in the FREQUENCY SPECIFICATIONS table for the 'DW80' speed grade and applies only when the device is locked to a valid SYNC input within its 5–20 MHz range.
Does the MC88916DW80 support duty cycle compliance for the 68040 PCLK input at 40 MHz?
Yes - the MC88916DW80's 2X_Q output meets the 68040 PCLK duty cycle requirement (40–60%) when operating at 40 MHz Q-output frequency (i.e., 80 MHz 2X_Q). The datasheet confirms this explicitly: "For the 33 and 40MHz 68040, the 2X_Q output will meet the duty cycle requirements of the PCLK input."
How does the RST_IN/RST_OUT(LOCK) function work on the MC88916DW80 during system power-up?
When RST_IN is held high during power-up, RST_OUT(LOCK) remains actively low until phase-lock to SYNC is achieved (~10 ms), then transitions to high-impedance for external pull-up. If RST_IN is held low, RST_OUT stays low. After lock, toggling RST_IN low for ≥10 ns causes RST_OUT to assert low for exactly 1024 Q-output cycles - satisfying MC68040 reset timing.
What is the purpose of the RC1 pin on the MC88916DW80, and what component value is required?
The RC1 pin connects to a 1 MΩ resistor (to Analog VCC or GND) that injects current into the internal PLL charge pump. This stabilizes loop operation, suppresses jitter, and establishes a fixed phase offset between SYNC and Q outputs. For VCO frequencies below 40 MHz, a 1.5 MΩ resistor is recommended instead.
Can the MC88916DW80 be used in systems requiring a 180° phase-shifted clock output?
Yes - the MC88916DW80 provides Q3 as a dedicated inverted (180° phase-shifted) output relative to Q0–Q2. This is explicitly documented in the functional description: "The Q3 output is inverted (180° phase shift) from the 'Q' outputs," and appears as Pin 2 in the SOIC-20 pinout.
MC88916DW80 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- CISC/RISC Microprocessor
- Input:
- TTL
- Output:
- CMOS, TTL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:6
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 80MHz
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-SOIC
MC88916DW80 FAQ
1.How can I place an order for MC88916DW80 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC88916DW80 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 MC88916DW80 reliable?
The price and inventory of MC88916DW80 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC88916DW80 is usually 5 days.
3.What payment methods are accepted for MC88916DW80?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC88916DW80 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC88916DW80?
MC88916DW80 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC88916DW80 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 MC88916DW80?
For technical support, including MC88916DW80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC88916DW80 requirements.
6.How does Aetrix verify that MC88916DW80 is sourced from the original manufacturer or authorized distributors?
All MC88916DW80 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 MC88916DW80 meets industry standards.
7.What is the process for return or replacement of MC88916DW80?
All MC88916DW80 units undergo pre-shipment inspection (PSI). If there is an issue with MC88916DW80, 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 MC88916DW80 part is unused and in its original packaging.
Return procedure for MC88916DW80:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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