Renesas 8N3Q001FG-1078CDI

Overview

8N3Q001FG-1078CDI from Integrated Device Technology is a quad-frequency programmable crystal oscillator (XO) using fourth-generation FemtoClock® NG PLL technology. It delivers one LVPECL differential clock output with programmable frequencies from 15.476 MHz to 866.67 MHz and 975 MHz to 1,300 MHz, RMS phase jitter as low as 0.244 ps (12 kHz–20 MHz), and operates across –40°C to +85°C for wireless infrastructure timing applications.

For engineers reviewing the 8N3Q001FG-1078CDI datasheet, 8N3Q001FG-1078CDI pinout, 8N3Q001FG-1078CDI application, or 8N3Q001FG-1078CDI equivalent, this page provides verified technical context, I²C-programmable frequency architecture, LVPECL termination guidance, factory-default frequency mapping via FSEL pins, and validated alternatives for telecom clock tree design.

Technical Context

The 8N3Q001FG-1078CDI integrates a 100 MHz or 114.285 MHz fundamental-mode crystal oscillator driving a fractional-N PLL with 25-bit feedback divider (7-bit integer MINT + 18-bit fractional MFRAC), 2-bit pre-divider (P), and 7-bit post-divider (N). Its four independent configuration registers (P₀–P₃, MINT₀–MINT₃, MFRAC₀–MFRAC₃, N₀–N₃) are selected by FSEL0/FSEL1 and reprogrammable via I²C.

It supports both integer and fractional PLL feedback modes: integer mode yields lower phase noise (e.g., 0.244 ps RMS at 156.25 MHz, 12 kHz–20 MHz), while fractional mode enables ultra-fine resolution (435.9 Hz ÷ N) across its full 15.476 MHz–1.3 GHz range. The device uses separate VCC/VEE supplies and includes internal pullup/pulldown resistors on control inputs.

Key Specifications

Pinout & Package

8N3Q001FG-1078CDI is housed in a lead-free 10-lead ceramic package (5 mm × 7 mm × 1.55 mm, CD variant), with exposed pad not electrically connected. Pin 1 (DNU) is unused and must be left unconnected; all control inputs feature internal biasing (FSEL0/FSEL1 pulldown, OE/SCLK/SDATA pullup).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM and 8A34002NLGI, the 8N3Q001FG-1078CDI uniquely combines hardware-selectable quad defaults, single-LVPECL output simplicity, and sub-0.25 ps jitter - making it optimal for cost-sensitive, space-constrained telecom timing nodes where boot-time frequency agility matters.

Availability

8N3Q001FG-1078CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport networking, and enterprise switching applications requiring stable component supply, guaranteed industrial temperature operation, and RoHS-compliant packaging.

Supply support for 8N3Q001FG-1078CDI 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, designs high-performance timing, memory interface, and RF power solutions for communications, computing, and industrial markets.

The IDT8N3Q001 family delivers programmable XOs targeting wireless infrastructure and telecom equipment, emphasizing low phase noise, flexible frequency selection, and robust industrial-grade reliability.

FAQ

What is the factory-default frequency configuration for 8N3Q001FG-1078CDI?

The 8N3Q001FG-1078CDI is factory-programmed with four default frequencies corresponding to order code "1078", which maps to the 1xxx series indicating a 100.000 MHz crystal and integer PLL feedback mode. Per IDT's ordering documentation, this configuration typically includes 100 MHz, 122.88 MHz, 125 MHz, and 156.25 MHz - all stored in P₀–P₃ registers and selected via FSEL0/FSEL1. These defaults are loaded at power-up before any I²C write.

Does 8N3Q001FG-1078CDI support both 2.5 V and 3.3 V operation?

Yes, 8N3Q001FG-1078CDI supports full 2.5 V ±5% or 3.3 V ±5% supply operation, as confirmed in Tables 5A and 5B of the datasheet. The device automatically adapts LVPECL output levels (VOH/VOL) and internal biasing to the applied VCC. No hardware modification is needed - simply route the appropriate supply voltage to pin 8 (VCC) and tie VEE (pin 3) to ground.

How does the I²C interface of 8N3Q001FG-1078CDI differ from standard I²C peripherals?

The 8N3Q001FG-1078CDI implements a simplified I²C slave interface: SDATA is open-drain with internal pullup, SCLK has internal pullup, and no ACK/NACK or address byte is required. Writes target volatile configuration registers (P/M/N dividers) and persist only until next power cycle. Unlike standard I²C devices, it does not support read-back of register contents - only write operations are defined in the programming guide.

What is the significance of the "CD" package suffix in 8N3Q001FG-1078CDI?

The "CD" suffix in 8N3Q001FG-1078CDI denotes a lead-free, 10-lead ceramic package measuring 5 mm × 7 mm × 1.55 mm, per IDT's ordering nomenclature. This package features a hermetically sealed ceramic body, RoHS 6 compliance, and optimized thermal resistance (θJA = 49.4°C/W at 0 m/s airflow), enabling stable operation in thermally demanding wireless base station environments.

Can 8N3Q001FG-1078CDI generate frequencies below 15.476 MHz or above 1.3 GHz?

No - the 8N3Q001FG-1078CDI is specified strictly for 15.476–866.67 MHz and 975–1300 MHz output ranges, as stated in Table 3B and Section 1. Attempting to program outside these bands results in undefined behavior or failure to lock the PLL. The lower bound arises from post-divider (N) limits and VCO tuning range; the 975–1300 MHz band requires N = 2, while 15.476–866.67 MHz uses N = 3–126.