Renesas 650R-01ILF

Overview

650R-01ILF from Renesas Electronics (formerly IDT/ICS) is a system peripheral clock synthesizer IC that generates up to eight precision clocks-including PCI, SCSI, Fast Ethernet (20 MHz), USB (12/24/48 MHz), and AC97 audio (12.288/24.576/49.152 MHz)-from a single 14.31818 MHz parallel-resonant crystal. It operates at 3.3 V or 5 V, delivers <1 ppm synthesis error, and supports industrial temperature range (−40°C to +85°C).

For engineers reviewing the 650R-01ILF datasheet, 650R-01ILF pinout, 650R-01ILF application, or 650R-01ILF equivalent, this device serves as a configurable, low-jitter timing source for legacy PC peripheral buses and audio subsystems where frequency selectability, tri-state output control (OE), and industrial-grade reliability are required.

Technical Context

The 650R-01ILF implements an analog/digital hybrid PLL architecture to synthesize multiple synchronous clocks with sub-ppm accuracy. Its core input is a fixed 14.31818 MHz crystal or clock applied to X1/ICLK and X2, with internal oscillator circuitry enabling stable startup and low phase noise.

Frequency selection is achieved via three dedicated control pins: PSEL1/PSEL0 configure four processor clocks (PCLK1–PCLK4) across six combinations including 25/50/18.75 MHz and 20/33.3334/66.6667 MHz; USEL selects among three USB frequencies; ASEL chooses one of three AC97 audio rates. All outputs exhibit 40/60% duty cycle and ≤75 ps (PCLK/UCLK/20M) or ≤170 ps (ACLK) one-sigma jitter.

Key Specifications

Pinout & Package

650R-01ILF is housed in a 20-pin Small Outline Integrated Circuit (SSOP), also referenced as QSOP, with 150-mil body width and JEDEC-compliant dimensions (8.65 × 6.0 mm). The package is lead-free (LF) and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS650R-01LF, the 650R-01ILF adds industrial temperature support without changing footprint or logic behavior; versus Si5351A-B-GM, it offers hardware-configured, guaranteed-accuracy peripheral clocks with zero firmware overhead but less frequency agility.

Availability

650R-01ILF is available at Aetrix Electronics and suitable for PCI bus timing, SCSI host adapter design, Fast Ethernet PHY interface, and AC97 audio subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 650R-01ILF 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, infrastructure, and IoT applications.

The 650R-01ILF belongs to Renesas' legacy IDT clock synthesis portfolio, designed specifically to replace discrete crystal oscillators and multiple fixed-frequency clocks in PC peripheral and embedded computing platforms.

FAQ

What is the operating voltage range supported by the 650R-01ILF?

The 650R-01ILF supports a supply voltage range of 3.0 V to 5.5 V, allowing direct integration into both 3.3 V and 5 V legacy system designs without level translation. Electrical characteristics are specified at both 3.3 V ±5% and 5 V nominal, with typical supply current of 30 mA at 3.3 V and 50 mA at 5 V under no-load conditions. This dual-voltage capability makes the 650R-01ILF suitable for mixed-rail motherboards and industrial controllers where voltage rails vary across subsystems.

Does the 650R-01ILF require an external crystal or can it accept a clock input?

Yes, the 650R-01ILF accepts either a parallel-resonant 14.31818 MHz crystal connected across X1/ICLK and X2, or a single-ended clock signal driven directly into X1/ICLK while leaving X2 unconnected. The datasheet specifies crystal parameters including fundamental-mode operation, 300 ppm stability, and recommended load capacitance calculation (Crystal caps = (CL − 12) × 2 pF). When using a clock input, the 650R-01ILF bypasses internal oscillator circuitry and uses the external signal as its PLL reference.

How does the OE (output enable) pin function on the 650R-01ILF?

The OE pin on the 650R-01ILF is an active-low input that places all eight clock outputs-UCLK, ACLK, PCLK1–PCLK4, 20M, and 14.318M-into a high-impedance (tri-state) condition when asserted low. This feature enables non-intrusive board-level testing, such as boundary scan or functional validation, without clock contention or unintended toggling of downstream logic. The 650R-01ILF retains internal PLL lock during OE assertion, allowing immediate clock resumption upon deassertion.

What USB and AC97 clock frequencies does the 650R-01ILF support?

The 650R-01ILF supports three USB clock frequencies-12 MHz, 24 MHz, and 48 MHz-selected via the USEL pin, and three AC97 audio clock frequencies-12.288 MHz, 24.576 MHz, and 49.152 MHz-selected via the ASEL pin. These values align precisely with USB full-speed/low-speed/high-speed PHY requirements and AC97 sample-rate multiples (48 kHz, 96 kHz, 192 kHz). No external dividers or configuration registers are needed-the 650R-01ILF implements these frequencies in hardware using its internal PLL and divider chains.

Is the 650R-01ILF pin-compatible with other members of the ICS650 family?

Yes, the 650R-01ILF is pin-compatible with the commercial-grade 650R-01LF and tape-and-reel variants (650R-01LFT, 650R-01ILFT), sharing identical 20-pin SSOP footprint, pin assignments, and logic-level behavior. Differences are limited to temperature grading (industrial −40°C to +85°C vs. commercial 0°C to +70°C) and packaging format (tubes vs. tape-and-reel). No PCB layout changes are required when upgrading from 650R-01LF to 650R-01ILF in existing designs.