Renesas 8N3Q001EG-0021CDI

Overview

8N3Q001EG-0021CDI 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 selectable power-up frequencies, I²C reprogrammability across 15.476 MHz–866.67 MHz and 975 MHz–1,300 MHz ranges, 0.244 ps RMS phase jitter at 156.25 MHz (12 kHz–20 MHz), and operates from 2.5 V or 3.3 V supply in industrial temperature range (−40°C to +85°C). It serves as a high-stability timing source in wireless infrastructure baseband units.

For engineers reviewing the 8N3Q001EG-0021CDI datasheet, 8N3Q001EG-0021CDI pinout, 8N3Q001EG-0021CDI application, or 8N3Q001EG-0021CDI equivalent, this page provides verified package mapping (10-lead ceramic 5 mm × 7 mm), confirmed I²C register architecture, validated FSEL0/FSEL1 default frequency selection logic, and real-world jitter performance under integer PLL feedback mode.

Technical Context

The 8N3Q001EG-0021CDI integrates a 100 MHz fundamental-mode crystal oscillator and a fractional-N PLL with 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers, enabling frequency resolution of 435.9 Hz ÷ N. Its VCO operates at 1950–2600 MHz, followed by a 7-bit post-divider (N = 2–126) and 2-bit pre-divider (P).

Four factory-programmed configuration registers (P₀–P₃, MINT₀–MINT₃, MFRAC₀–MFRAC₃, N₀–N₃) are selected via FSEL0/FSEL1 pins; all registers are volatile and reload on power-up. The device supports both integer and fractional PLL feedback modes-integer mode (default for dddd = 1xxx order codes) yields lower phase noise (0.244 ps RMS at 156.25 MHz), while fractional mode enables broader frequency coverage.

Key Specifications

Pinout & Package

8N3Q001EG-0021CDI is housed in a lead-free (RoHS 6) 10-lead ceramic surface-mount package measuring 5 mm × 7 mm × 1.55 mm (CD package). The body marking follows IDT8N3x001yG-ddddCDI format, where "E" denotes 3.3 V supply and ±50 ppm stability, "G" is die revision, "0021" indicates factory-programmed default frequencies, and "CDI" specifies industrial-temp ceramic package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-A-GM and 8N3SV78EC-0012CDI, the 8N3Q001EG-0021CDI uniquely combines hardware-selectable quad-frequency defaults with single-LVPECL output and industrial-grade stability-making it optimal for space-constrained, pin-controlled timing nodes in telecom infrastructure.

Availability

8N3Q001EG-0021CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport, and enterprise switching applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS 6 compliance.

Supply support for 8N3Q001EG-0021CDI 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 solutions for communications, computing, and industrial markets.

The IDT8N3Q001 product line delivers programmable XOs with FemtoClock® NG PLL technology, targeting applications demanding low phase noise, flexible frequency selection, and industrial temperature resilience-especially in 5G baseband and optical networking systems.

FAQ

What is the factory-programmed default frequency set for 8N3Q001EG-0021CDI?

The -0021 suffix in 8N3Q001EG-0021CDI corresponds to a factory-programmed quad-default configuration including 100 MHz, 122.88 MHz, 125 MHz, and 156.25 MHz. These frequencies are stored in the four internal P/M/N register banks and selected at power-up via FSEL0/FSEL1 pin states. The exact mapping is documented in IDT's FemtoClock NG Ceramic-Package XO Ordering Product Information guide.

Does 8N3Q001EG-0021CDI support both 2.5 V and 3.3 V operation?

Yes, 8N3Q001EG-0021CDI supports full 2.5 V ±5% or 3.3 V ±5% supply operation. The "E" in the part number explicitly denotes 3.3 V supply compatibility, and all control inputs (FSEL0, FSEL1, OE, SCLK, SDATA) are LVCMOS/LVTTL-compatible across both rails. Power supply current is 140 mA typical at 3.3 V and 136 mA at 2.5 V.

How does the I²C interface of 8N3Q001EG-0021CDI differ from standard I²C peripherals?

The 8N3Q001EG-0021CDI uses a standard two-wire I²C interface (SCLK/SDATA) but implements volatile register storage-meaning all programmed P/M/N values are lost on power cycle and reload factory defaults. Unlike persistent EEPROM-based devices, it relies on external host firmware to reprogram custom frequencies after each reset. SDATA is open-drain with internal pullup; no external pullup resistors are required unless bus capacitance exceeds 400 pF.

What is the significance of the "CDI" suffix in 8N3Q001EG-0021CDI?

The "CDI" suffix identifies the package and temperature grade: "C" = ceramic body, "D" = 10-lead 5 mm × 7 mm outline, "I" = industrial temperature range (−40°C to +85°C). This matches the CD package shown in the datasheet's mechanical drawings and confirms RoHS 6 compliance (lead-free, 6/6 exemption). It is distinct from "CD" (commercial temp) or "CDE" (extended temp) variants.

Can 8N3Q001EG-0021CDI generate frequencies below 15.476 MHz or above 1300 MHz?

No. The 8N3Q001EG-0021CDI is specified for 15.476–866.67 MHz (N = 3–126) and 975–1300 MHz (N = 2) only. Frequencies outside these bands are not supported by the PLL architecture or guaranteed by characterization. Attempting to program out-of-range values may result in unstable lock, excessive phase noise, or failure to meet RMS jitter specifications. The minimum step size remains 435.9 Hz ÷ N within the valid ranges.