Renesas 525R-03ILF

Overview

525R-03ILF from IDT is a user-configurable PECL-input clock generator IC implementing a PLL-based oscillator replacement architecture. It accepts PECL input frequencies from 0.5 to 250 MHz and delivers configurable CMOS or PECL output clocks up to 250 MHz (at 5 V) with ±350 ps absolute period jitter, operating across -40°C to +85°C for industrial timing applications in telecom line cards and FPGA clocking systems.

For engineers reviewing the 525R-03ILF datasheet, 525R-03ILF pinout, 525R-03ILF application, or 525R-03ILF equivalent, this page provides verified package mapping (28-pin SSOP), validated pin functions including RES-controlled output mode selection, confirmed AC/DC electrical specs per Rev L datasheet, and two field-validated alternative clock generators with documented functional trade-offs.

Technical Context

The 525R-03ILF integrates a phase-locked loop with a voltage-controlled oscillator (VCO), reference divider (RDW = 0–127), VCO divider (VDW = 0–511), and programmable output divider (OD = 1–8). Its pre-divider (P) is set by RES pin state and S2:S0 select pins, enabling frequency synthesis without microcontroller intervention.

Input-to-output skew and jitter are not specified; only absolute and one-sigma period jitter (±350 ps, 125 ps) are guaranteed. Output mode (CMOS vs. complementary PECL) is determined solely by RES pin connection - direct ground yields CMOS outputs; 1.1 kΩ pull-up to VDD enables PECL outputs requiring external 62 Ω / 270 Ω termination networks.

Key Specifications

Pinout & Package

525R-03ILF is housed in a 28-pin SSOP (150 mil body) package per JEDEC MO-153. Pin pitch is 0.635 mm; body width is 3.80–4.00 mm; lead length is 0.40–1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-D-GM and ICS552GI-01LF, the 525R-03ILF uniquely balances hardware-only configurability, wide input/output range (0.5–250 MHz), and industrial temperature support without requiring crystals or serial interfaces - making it optimal for fixed-function, high-reliability timing subsystems.

Availability

525R-03ILF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and FPGA-based embedded systems requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support.

Supply support for 525R-03ILF 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

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

The ICS525 family was designed specifically for oscillator replacement in high-frequency digital systems - enabling flexible, low-jitter clock generation without custom crystal design or firmware dependencies.

FAQ

What is the function of the RES pin on the 525R-03ILF?

The RES pin on the 525R-03ILF determines output signal type: connecting RES directly to ground configures CLK1 and CLK2 as low-skew CMOS outputs, while connecting RES to VDD through a 1.1 kΩ resistor enables complementary PECL outputs requiring external 62 Ω / 270 Ω termination. This hardware-selectable mode eliminates need for configuration registers or software initialization in the 525R-03ILF.

Does the 525R-03ILF require an external crystal or resonator?

No, the 525R-03ILF does not require an external crystal or resonator. It is a PLL-based clock multiplier that uses a PECL input clock as its reference source. The internal VCO generates the output frequency based on programmed dividers (R6:R0, V8:V0, S2:S0), making the 525R-03ILF a true oscillator replacement device with no external timing components needed beyond decoupling capacitors and optional termination resistors.

What is the maximum guaranteed output frequency for the 525R-03ILF at 3.3 V supply?

The 525R-03ILF guarantees a maximum output frequency of 200 MHz when operated at VDD = 3.0–3.6 V, as specified in the AC Electrical Characteristics table (Rev L datasheet, page 6). This limit applies regardless of input frequency or divider settings - exceeding 200 MHz at 3.3 V may result in undefined behavior or failure to lock the PLL, so the 525R-03ILF must be supplied with ≥4.5 V for 250 MHz operation.

Can the 525R-03ILF generate odd integer output dividers?

Yes, the 525R-03ILF supports odd integer output dividers (e.g., OD = 1, 3, 5, 7) as defined in the Output Divider and Maximum Output Frequency Table (page 2 of datasheet). When using odd dividers, the 525R-03ILF guarantees a 40–60% output clock duty cycle at VDD/2, which is acceptable for most synchronous logic but may require external duty-cycle correction for sensitive analog or RF sampling circuits.

Is the 525R-03ILF pin-compatible with other devices in the ICS525 family?

Yes, the 525R-03ILF shares identical pinout, package (28-pin SSOP), and functional architecture with all members of the ICS525 family, including ICS525R-01ILF and ICS525R-02ILF. Differences between variants are limited to pre-programmed divider defaults and supported input/output frequency ranges - all share the same 525R-03ILF pin assignments, electrical characteristics, and configuration methodology.