Renesas 8N3Q001EG-1045CDI8

Overview

8N3Q001EG-1045CDI8 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 factory-programmed default frequencies, I²C reprogrammability across 15.476 MHz–866.67 MHz and 975 MHz–1,300 MHz, RMS phase jitter as low as 0.244 ps 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-1045CDI8 datasheet, 8N3Q001EG-1045CDI8 pinout, 8N3Q001EG-1045CDI8 application, or 8N3Q001EG-1045CDI8 equivalent, this page provides verified technical context, exact pin functions, real-world use cases in telecom synchronization, jitter-sensitive SerDes clocking, and frequency-agile test equipment - all grounded in the official IDT8N3Q001 REV G datasheet.

Technical Context

The 8N3Q001EG-1045CDI8 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 VCO operates at 1950–2600 MHz, enabling ultra-fine frequency resolution down to 435.9 Hz ÷ N.

Four independent configuration registers (P₀/MINT₀/MFRAC₀/N₀ through P₃/MINT₃/MFRAC₃/N₃) store factory-default frequencies selected by FSEL0/FSEL1 pins; all registers are volatile and reload on power-up. The device supports both integer and fractional PLL feedback modes - integer mode yields lower phase noise (e.g., 0.244 ps RMS @ 156.25 MHz), while fractional mode enables broader frequency coverage.

Key Specifications

Pinout & Package

8N3Q001EG-1045CDI8 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 pull resistors (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-A-GM and 8A34001C-001NLGI, the 8N3Q001EG-1045CDI8 offers simpler single-output LVPECL timing with hardware-selectable defaults - reducing firmware overhead in fixed-function telecom modules - while maintaining industry-leading phase noise for its class and footprint.

Availability

8N3Q001EG-1045CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport network line cards, and high-speed SerDes clocking applications requiring stable component supply, guaranteed industrial temperature operation, and RoHS-compliant packaging.

Supply support for 8N3Q001EG-1045CDI8 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 ICs for communications, computing, and industrial markets.

The IDT8N3Q001 product line delivers high-frequency, low-jitter programmable oscillators targeting wireless infrastructure, telecom switching, and high-speed serial interface timing - emphasizing flexibility, phase noise performance, and ease of integration via I²C and hardware pin control.

FAQ

What is the factory-programmed default frequency set for 8N3Q001EG-1045CDI8?

The "1045" in 8N3Q001EG-1045CDI8 indicates the default frequency order code. Per IDT's ordering documentation, this corresponds to factory-programmed frequencies of 100 MHz, 122.88 MHz, 125 MHz, and 156.25 MHz - stored in registers P₀–P₃/MINT₀–MINT₃/N₀–N₃ and selected by FSEL0/FSEL1 states at power-up. These values are confirmed in the IDT8N3Q001 REV G datasheet Table 4 and Ordering Information section.

Does 8N3Q001EG-1045CDI8 support both 2.5 V and 3.3 V operation?

Yes, 8N3Q001EG-1045CDI8 supports full operation at either 2.5 V ±5% or 3.3 V ±5%, as specified in Tables 5A and 5B of the datasheet. Supply current is 136 mA typical at 2.5 V and 140 mA at 3.3 V. All I/O (FSEL0/FSEL1/OE/SCLK/SDATA) are LVCMOS/LVTTL compatible across both supply voltages, and the LVPECL outputs maintain valid VOH/VOL levels per Table 5D.

How is phase noise performance affected by PLL feedback mode in 8N3Q001EG-1045CDI8?

When configured for integer PLL feedback (MFRAC = 0), 8N3Q001EG-1045CDI8 achieves lower RMS phase jitter - 0.244 ps at 156.25 MHz (12 kHz–20 MHz) - due to reduced in-band noise from delta-sigma modulation. Fractional mode extends frequency coverage but increases jitter to 0.440–0.995 ps depending on fOUT. The datasheet specifies integer mode for 1xxx order codes like 1045, confirming optimal noise performance for this part.

Can 8N3Q001EG-1045CDI8 be reprogrammed in-system after soldering?

Yes, 8N3Q001EG-1045CDI8 supports full in-system reprogramming via its 2-wire I²C interface (SCLK/SDATA pins). Users can write new P/M/N values to any of the four configuration registers and select them dynamically using FSEL0/FSEL1. Registers are volatile - contents reset to factory defaults on power cycle - ensuring safe recovery if custom programming fails.

What is the recommended termination for the LVPECL outputs of 8N3Q001EG-1045CDI8?

IDT specifies 50 Ω termination to VCC − 2 V for both Q and nQ outputs. For 3.3 V operation, this equals 1.3 V; for 2.5 V, it approximates ground. Figure 1A (dual 50 Ω to VCC − 2 V) and Figure 2C (dual 50 Ω with optional 18 Ω series resistor) in the datasheet show validated layouts. Proper termination is essential to meet tR/tF (100–425 ps) and odc (45–55%) specs and minimize reflections in high-speed traces.