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

Renesas 508MLF

Name: 508MLF
Brand: Renesas
SKU: 508MLF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 508MLF

Manufacturer:: Renesas

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 508MLF.pdf

Description:: IC CLOCK GENERATOR 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

The 508MLF from IDT (now Renesas Electronics) is a PECL-to-CMOS clock translator IC designed for high-frequency clock signal level conversion in timing-critical systems. It supports 0–250 MHz input frequency, features separate VDDP (3.3V/5V) and VDDC (2.5V/3.3V/5V) supplies for voltage translation, delivers 24 mA output drive, and includes tri-state output control via OE pin.

For engineers reviewing the 508MLF datasheet, 508MLF pinout, 508MLF application, or 508MLF equivalent, key selection considerations include its dual-supply architecture, industrial-grade temperature variants (e.g., 508MILF), duty cycle stability across frequency bands, propagation delay variation with supply combinations, and SOIC-8 packaging compatibility with board-level test requirements.

Technical Context

The 508MLF implements a dedicated two-stage buffer architecture: a PECL-input differential receiver followed by a CMOS-output driver with independent power domains. Its internal OE pull-up to VDDC enables default-active operation without external biasing.

It operates across three voltage regimes - VDDP ≥ VDDC (with VDDP = 3–5.5 V, VDDC = 2.375–5.5 V) - and maintains specified AC performance (rise/fall times ≤1 ns at 2.5 V, propagation delay 4–9 ns) only within validated supply pairings and frequency ranges per datasheet tables.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Frequency Range	0–250 MHz: supports full-speed Ethernet, SONET/SDH, and high-speed serial link reference clocks.
Output Drive Strength	24 mA at 5 V, 18 mA at 3.3 V, 8 mA at 2.5 V: sufficient to drive multiple CMOS loads or transmission lines with series termination.
Duty Cycle Accuracy	45/55% (0–100 MHz), ±5% degradation up to 250 MHz: ensures balanced clock edges for flip-flop setup/hold timing margins.
Propagation Delay	4–9 ns depending on VDDP/VDDC pairing: critical for synchronous system timing budget allocation.
OE Disable/Enable Time	7–20 ns: enables precise clock gating during system power sequencing or test mode entry.
Supply Voltage Range	VDDP = 3–5.5 V, VDDC = 2.375–5.5 V, with VDDP ≥ VDDC: allows mixed-voltage board designs without external level shifters.

Pinout & Package

Package: 8-pin SOIC (150 mil, Pb-free), JEDEC MS-012AC compliant, thermal resistance θJA = 150°C/W (still air).

Pin/Terminal	Circuit Role	Design Meaning
VDDP (Pin 1)	Power supply	Supplies PECL input buffer only; must be ≥ VDDC and stable within ±5% for reliable differential input threshold tracking.
PECLIN (Pin 2)	Differential input	Inverting PECL clock input; requires proper termination (e.g., 33Ω series + 50Ω to VDDP − 2 V) for signal integrity.
PECLIN (Pin 3)	Differential input	Non-inverting PECL clock input; paired with Pin 2 to reject common-mode noise on high-speed traces.
GND (Pin 4)	Ground reference	Primary ground return for PECL input stage; must be low-inductance connection adjacent to decoupling capacitor.
OE (Pin 5)	Digital control	Active-high output enable with internal 250 kΩ pull-up to VDDC; drives CLK into high-impedance state when low.
GND (Pin 6)	Ground reference	Ground return for CMOS output stage; isolated from Pin 4 in layout to minimize crosstalk between input/output domains.
CLK (Pin 7)	Clock output	Single-ended CMOS clock output; slew rate and drive strength depend on VDDC and load capacitance.
VDDC (Pin 8)	Power supply	Supplies CMOS output buffer and OE logic; sets output voltage swing and timing thresholds.

Key Features

Feature	Design Value
Independent VDDP/VDDC supplies	Enables direct interfacing between 5 V PECL sources and 2.5 V FPGA clock inputs without external level-shifting circuitry.
Tri-state output with internal OE pull-up	Eliminates need for external pull-up resistors on OE, simplifying board design and reducing BOM count.
24 mA output drive at 5 V	Supports fan-out of ≥10 standard CMOS loads or direct driving of 50 Ω transmission lines with minimal overshoot.
Industrial temperature option (508MILF)	Validated operation from −40°C to +85°C enables deployment in base station RF modules and automotive infotainment timing paths.
Low propagation delay variation	Delay spread <3 ns across VDDP/VDDC combinations ensures predictable clock skew in multi-rail systems.

Applications

High-Speed Networking Equipment	Synchronous Optical Network (SONET) Line Cards
Use Scenario: Converting 155.52 MHz PECL reference clocks from line interface units to CMOS-compatible signals for framer ASICs. IC Role / Device Role / Timing Role: PECL-to-CMOS level translator ensuring signal integrity and timing alignment across voltage domains. Use Value: Maintains sub-nanosecond edge fidelity and 45/55% duty cycle required for OC-3/OC-12 data recovery lock stability.	Use Scenario: Distributing 622.08 MHz clock signals from a central timing module to multiple SONET PHY devices operating at different supply voltages. IC Role / Device Role / Timing Role: Frequency-transparent voltage translator enabling interoperability between legacy 5 V PECL timing sources and modern 3.3 V CMOS PHYs. Use Value: Eliminates need for discrete resistor networks or active translators, reducing board area and jitter accumulation.
Test & Measurement Instrumentation	Industrial PLC Clock Distribution
Use Scenario: Enabling clock gating during automated functional test sequences using the OE pin to isolate DUT clock domains. IC Role / Device Role / Timing Role: Programmable clock buffer with fast enable/disable response for synchronized stimulus/response capture. Use Value: 7–20 ns OE timing allows precise control of clock assertion windows aligned to test pattern edges.	Use Scenario: Translating 100 MHz PECL oscillator outputs to 2.5 V CMOS levels for microcontroller-based motion control timing engines. IC Role / Device Role / Timing Role: Robust clock interface component supporting extended temperature operation and EMI-resistant differential input. Use Value: Industrial-grade variant (508MILF) guarantees reliable startup and operation across −40°C to +85°C ambient ranges.

High-Speed Networking Equipment

Synchronous Optical Network (SONET) Line Cards

Use Scenario: Converting 155.52 MHz PECL reference clocks from line interface units to CMOS-compatible signals for framer ASICs.

IC Role / Device Role / Timing Role: PECL-to-CMOS level translator ensuring signal integrity and timing alignment across voltage domains.

Use Value: Maintains sub-nanosecond edge fidelity and 45/55% duty cycle required for OC-3/OC-12 data recovery lock stability.

Use Scenario: Distributing 622.08 MHz clock signals from a central timing module to multiple SONET PHY devices operating at different supply voltages.

IC Role / Device Role / Timing Role: Frequency-transparent voltage translator enabling interoperability between legacy 5 V PECL timing sources and modern 3.3 V CMOS PHYs.

Use Value: Eliminates need for discrete resistor networks or active translators, reducing board area and jitter accumulation.

Test & Measurement Instrumentation

Industrial PLC Clock Distribution

Use Scenario: Enabling clock gating during automated functional test sequences using the OE pin to isolate DUT clock domains.

IC Role / Device Role / Timing Role: Programmable clock buffer with fast enable/disable response for synchronized stimulus/response capture.

Use Value: 7–20 ns OE timing allows precise control of clock assertion windows aligned to test pattern edges.

Use Scenario: Translating 100 MHz PECL oscillator outputs to 2.5 V CMOS levels for microcontroller-based motion control timing engines.

IC Role / Device Role / Timing Role: Robust clock interface component supporting extended temperature operation and EMI-resistant differential input.

Use Value: Industrial-grade variant (508MILF) guarantees reliable startup and operation across −40°C to +85°C ambient ranges.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PECL-to-CMOS translation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NB7L572M	LVDS/PECL input, 3.3 V only output, higher max frequency (≥3.5 GHz), no OE pin	Targeted at ultra-high-speed SerDes clocking; lacks tri-state capability and dual-supply flexibility	Select when >1 GHz operation is required and board-level clock gating is handled elsewhere
Renesas 8T49N241	Programmable clock generator with integrated PLL, supports PECL/CMOS/LVDS I/O, 12-output, 2.5/3.3 V only	Full timing solution vs. single-function translator; higher integration, cost, and configuration overhead	Select when system requires multiple synchronized clocks or frequency synthesis beyond translation

Compared with NB7L572M and 8T49N241, the 508MLF provides optimal balance of simplicity, dual-supply adaptability, and deterministic low-latency translation for fixed-frequency, voltage-isolated clock distribution - without added complexity or cost of programmability or ultra-high-speed capability.

Availability

508MLF is available at Aetrix Electronics and suitable for high-speed networking equipment, SONET line cards, test instrumentation, and industrial PLC clock distribution requiring stable component supply and long-term manufacturability.

Supply support for 508MLF 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a global leader in timing, memory interface, and RF power solutions for communications, computing, and industrial markets.

The 508MLF belongs to IDT's ClockBlocks™ family - purpose-built for low-jitter, high-fidelity clock signal translation and distribution in infrastructure and embedded timing applications.

FAQ

What is the maximum operating frequency supported by the 508MLF?

The 508MLF supports an input frequency range of 0–250 MHz. At 166–250 MHz, duty cycle tolerance expands to 35–65%, and propagation delay increases slightly. Performance remains fully specified per datasheet AC characteristics only within validated VDDP/VDDC combinations - e.g., VDDP = 5 V / VDDC = 2.5 V yields 35–65% duty cycle at 250 MHz. The 508MLF is not rated for operation above 250 MHz.

Does the 508MLF require external pull-up resistors on the OE pin?

No, the 508MLF includes an internal 250 kΩ pull-up resistor on the OE pin connected to VDDC. This ensures the output remains enabled by default when OE is left unconnected or driven high. External pull-ups are unnecessary and may cause contention if VDDC is absent during power-up. The 508MLF OE logic is active-high, and the pin is internally referenced to VDDC for consistent threshold behavior.

Can VDDP and VDDC be set to the same voltage on the 508MLF?

Yes, VDDP and VDDC may be set to identical voltages (e.g., both at 3.3 V), provided VDDP ≥ VDDC is maintained. Doing so simplifies power delivery but forfeits the primary benefit of the 508MLF: voltage translation between disparate logic domains. When equal, the 508MLF still provides PECL-to-CMOS conversion, tri-state control, and low-jitter buffering - making it suitable for systems where signal integrity and isolation matter more than voltage domain bridging.

What decoupling capacitors are required for stable operation of the 508MLF?

The 508MLF requires two 0.01 µF ceramic decoupling capacitors: one between VDDP and GND (Pin 1 and Pin 4), and another between VDDC and GND (Pin 8 and Pin 6). These must be placed as close as possible to their respective pins to minimize lead inductance. Additional bulk capacitance (e.g., 1–10 µF tantalum) is recommended on each supply rail. A 33 Ω series resistor adjacent to the CLK output (Pin 7) is advised for controlled impedance routing.

Is the 508MLF pin-compatible with industrial temperature variants like 508MILF?

Yes, the 508MLF and 508MILF share identical pinout, package (8-pin SOIC), and electrical interface. The sole difference is ambient operating temperature range: 508MLF is rated for 0°C to +70°C, while 508MILF extends to −40°C to +85°C. Both use the same marking format (e.g., "508MLF" vs. "508MILF") and thermal characteristics. No PCB changes are required when upgrading to the industrial variant, provided thermal design accommodates the wider range.

508MLF Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: ClockBlocks™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock Generator

PLL:: No

Input:: PECL

Output:: CMOS

Number of Circuits:: 1

Ratio - Input:Output:: 1:1

Differential - Input:Output:: Yes/No

Frequency - Max:: 250MHz

Divider/Multiplier:: No/No

Voltage - Supply:: 2.375V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

508MLF FAQ

1.How can I place an order for 508MLF through Aetrix?

Please submit a Request for Quotation (RFQ) for 508MLF 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 508MLF reliable?

The price and inventory of 508MLF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 508MLF is usually 5 days.

3.What payment methods are accepted for 508MLF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 508MLF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 508MLF?

508MLF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 508MLF 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 508MLF?

For technical support, including 508MLF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 508MLF requirements.

6.How does Aetrix verify that 508MLF is sourced from the original manufacturer or authorized distributors?

All 508MLF 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 508MLF meets industry standards.

7.What is the process for return or replacement of 508MLF?

All 508MLF units undergo pre-shipment inspection (PSI). If there is an issue with 508MLF, 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 508MLF part is unused and in its original packaging.

Return procedure for 508MLF:

1.Submit a request within 90 days.

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

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