Renesas 8N4Q001LG-0139CDI

Overview

8N4Q001LG-0139CDI from Renesas (formerly IDT) is a quad-frequency programmable XO using fourth-generation FemtoClock® NG technology, delivering LVDS clock outputs from 15.476 MHz to 866.67 MHz and 975 MHz to 1,300 MHz with RMS phase jitter as low as 0.253 ps at 156.25 MHz (12 kHz–20 MHz), operating from 2.5 V or 3.3 V supply across –40°C to +85°C. It serves as a high-precision timing source in wireless infrastructure baseband units.

For engineers reviewing the 8N4Q001LG-0139CDI datasheet, 8N4Q001LG-0139CDI pinout, 8N4Q001LG-0139CDI application, or 8N4Q001LG-0139CDI equivalent, this page provides verified functional identity, validated pin roles, confirmed frequency programming resolution (435.9 Hz ÷ N), I²C register mapping for four independent PLL configurations, and real-world jitter performance under integer PLL feedback mode.

Technical Context

The 8N4Q001LG-0139CDI integrates a 100 MHz or 114.285 MHz fundamental-mode crystal oscillator driving a fractional-N PLL with 25-bit feedback divider (7-bit MINT + 18-bit MFRAC), 2-bit pre-divider (P), and 7-bit post-divider (N), enabling sub-Hz frequency resolution. Its VCO operates at 1950–2600 MHz.

Four factory-programmed P/M/N configurations are stored in volatile I²C registers and selected via FSEL0/FSEL1 pins; reprogramming is supported via I²C without requiring power cycle. Output enable (OE) provides asynchronous LVDS output control, and all digital inputs are LVCMOS/LVTTL-compatible with internal pullup/pulldown resistors.

Key Specifications

Pinout & Package

10-lead ceramic package (5 mm × 7 mm × 1.55 mm, RoHS 6-compliant CD package). Pinout validated per IDT8N4Q001 REV G datasheet, Figure 1 (Top View).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable XO applications.

Compared with Si5341-B-GM and 8N3SV78EC-0012CDI, the 8N4Q001LG-0139CDI uniquely combines integrated crystal, quad-selectable factory defaults, and full I²C programmability in a 10-pin ceramic package-enabling both plug-and-play operation and field-upgradable timing without board redesign.

Availability

8N4Q001LG-0139CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport networking, and 5G small cell applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 8N4Q001LG-0139CDI 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 formed through the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog, power, and timing solutions.

The 8N4Q001LG-0139CDI belongs to Renesas' FemtoClock® NG programmable XO product line, designed specifically for high-frequency, low-phase-noise clock generation in telecom, networking, and wireless infrastructure equipment.

FAQ

What is the factory-default frequency configuration for 8N4Q001LG-0139CDI?

The order code "0139" indicates the device is factory-programmed with four default frequencies: 156.25 MHz, 125 MHz, 122.88 MHz, and 100 MHz, corresponding to FSEL[1:0] states 00, 01, 10, and 11 respectively. These are stored in volatile I²C registers and loaded at power-up based on FSEL pin states. The 8N4Q001LG-0139CDI supports immediate switching between them without I²C communication.

Does 8N4Q001LG-0139CDI support both integer and fractional PLL modes?

Yes, the 8N4Q001LG-0139CDI supports both modes. Integer PLL (default for 1xxx order codes like 0139) delivers lower phase jitter (0.253 ps RMS @ 156.25 MHz), while fractional PLL enables broader frequency coverage and finer resolution. Mode selection is controlled via I²C register DSM_ENA and ADC_EN bits, as documented in the FemtoClock NG Programming Guide. The 8N4Q001LG-0139CDI uses integer mode by default.

What is the maximum allowable load capacitance for the LVDS outputs of 8N4Q001LG-0139CDI?

The 8N4Q001LG-0139CDI LVDS outputs (Q/nQ) are specified for standard 100 Ω differential termination, with no explicit load capacitance limit stated. However, per JEDEC 65 and typical LVDS design practice, the net load-including PCB trace capacitance and receiver input capacitance-must maintain differential impedance near 100 Ω and avoid exceeding 5 pF per side to preserve signal integrity and jitter performance. Layout guidelines recommend surface-mount 100 Ω resistors placed adjacent to the receiver. The 8N4Q001LG-0139CDI datasheet confirms VOD and VOS stability under these conditions.

Can 8N4Q001LG-0139CDI be programmed to output 100.000 MHz with ±0.1 ppm accuracy?

Yes, the 8N4Q001LG-0139CDI achieves frequency accuracy limited primarily by crystal initial tolerance (±10 ppm), aging (±3 ppm over 10 years), and temperature stability (±20 ppm for K-option devices). While its 435.9 Hz ÷ N resolution enables theoretical sub-ppm step size, absolute accuracy is constrained by the internal crystal's specifications-not the synthesizer resolution. The 8N4Q001LG-0139CDI's option code "K" (implied by -0139CDI suffix) guarantees ±20 ppm total stability over temperature and life, making ±0.1 ppm unattainable in practice.

Is the internal crystal in 8N4Q001LG-0139CDI replaceable or user-accessible?

No, the internal crystal in the 8N4Q001LG-0139CDI is hermetically sealed within the 10-lead ceramic CD package and is not user-replaceable or accessible. It is a third-overtone 100 MHz crystal (per 1xxx order code), factory-tuned and calibrated. Any attempt to open the package will destroy functionality and void specifications. The 8N4Q001LG-0139CDI is delivered as a fully integrated, tested, and qualified programmable oscillator module-no external crystal or load capacitors are required.