Renesas 8N4Q001EG-1020CDI8

Overview

8N4Q001EG-1020CDI8 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 435.9 Hz ÷ N frequency resolution. It features I²C programmability, dual FSEL control inputs for power-up default selection, and operates across –40°C to +85°C in telecom and wireless infrastructure timing systems.

For engineers reviewing the 8N4Q001EG-1020CDI8 datasheet, 8N4Q001EG-1020CDI8 pinout, 8N4Q001EG-1020CDI8 application, or 8N4Q001EG-1020CDI8 equivalent, this page provides verified technical context, validated pin functions, confirmed jitter performance (0.253 ps RMS @ 156.25 MHz), package dimensions (5 mm × 7 mm × 1.55 mm ceramic), and two field-validated alternative XO options.

Technical Context

The 8N4Q001EG-1020CDI8 integrates a 1950–2600 MHz VCO with fractional-N PLL architecture, using a 100 MHz crystal reference (per order code "1020") and configurable P/MINT/MFRAC/N dividers to synthesize precise output frequencies. Its four independent I²C-programmable register sets (P₀–P₃, MINT₀–MINT₃, etc.) are selected at power-up via FSEL0/FSEL1 pins.

It supports both integer and fractional PLL feedback modes: integer mode delivers lower phase noise (0.253 ps RMS @ 156.25 MHz, 12 kHz–20 MHz integration), while fractional mode enables wider frequency coverage. The device uses internal pullup/pulldown resistors on all control inputs (50 kΩ typical) and requires external 100 Ω differential termination for LVDS outputs Q/nQ.

Key Specifications

Pinout & Package

8N4Q001EG-1020CDI8 is housed in a lead-free 10-lead ceramic CD package (5 mm × 7 mm × 1.55 mm) with exposed pad not connected internally. Pin 1 (DNU) is unused and must be left unconnected; all control inputs feature internal 50 kΩ pullup (OE, SCLK, SDATA) or pulldown (FSEL0, FSEL1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-A-GM and AK210-01-156.2500T, the 8N4Q001EG-1020CDI8 uniquely balances single-output simplicity, quad-frequency agility, and ultra-low jitter in a compact ceramic package-making it optimal for space-constrained, multi-standard timing nodes where reprogrammability matters.

Availability

8N4Q001EG-1020CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport, and high-speed data center switching applications requiring stable component supply, guaranteed long-term availability, and RoHS-compliant ceramic packaging.

Supply support for 8N4Q001EG-1020CDI8 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 (formerly IDT) is a global semiconductor leader specializing in timing, memory interface, and analog mixed-signal solutions for communications, computing, and industrial markets.

The 8N4Q001EG-1020CDI8 belongs to Renesas' FemtoClock® NG programmable XO family, engineered specifically for high-frequency, low-jitter timing in 4G/5G infrastructure, OTN gear, and next-gen switches where frequency agility and phase noise performance are critical.

FAQ

What is the crystal reference frequency used in 8N4Q001EG-1020CDI8?

The 8N4Q001EG-1020CDI8 uses an internal 100.000 MHz fundamental-mode crystal (order code "1020" indicates 1xxx series, which maps to 100 MHz integer PLL mode). This reference drives the FemtoClock® NG VCO (1950–2600 MHz) and enables precise synthesis of output frequencies from 15.476 MHz to 1.3 GHz. The crystal's initial accuracy is ±10 ppm, with ±20 ppm total stability over 10 years (K-grade option).

Does 8N4Q001EG-1020CDI8 support both 2.5 V and 3.3 V operation?

Yes, 8N4Q001EG-1020CDI8 fully supports dual-supply operation: VDD may be either 2.5 V ±5% or 3.3 V ±5%. All digital inputs (OE, FSEL0, FSEL1, SCLK, SDATA) are LVCMOS/LVTTL-compatible across both voltages, and the LVDS outputs (Q/nQ) maintain specified 247–454 mV differential swing and 1.0–1.375 V common-mode range under either supply condition.

How is frequency programmed on 8N4Q001EG-1020CDI8 after power-up?

After power-up, new frequency configurations are written to volatile I²C registers (P, MINT, MFRAC, N) via the SDATA/SCLK interface. To avoid glitches, Renesas recommends writing to an unselected register set (e.g., P₁/MINT₁/MFRAC₁/N₁ while FSEL[1:0] = 00), then changing FSEL[1:0] to activate it. Frequency settling time after FSEL change is 470 µs (typical), and the device retains factory defaults on power cycle unless reprogrammed.

What is the RMS phase jitter specification for 8N4Q001EG-1020CDI8 at 156.25 MHz?

At 156.25 MHz output, the 8N4Q001EG-1020CDI8 achieves 0.253 ps RMS phase jitter (12 kHz–20 MHz integration) in integer PLL mode - the default configuration for 100 MHz crystal devices like this part. This value meets stringent requirements for SONET OC-192, 10G Ethernet, and CPRI v6.0, and is measured with fXTAL = 100.000 MHz and optimal loop filter settings per the FemtoClock NG Programming Guide.

Can unused pins on 8N4Q001EG-1020CDI8 be left floating?

Pin 1 (DNU) must remain unconnected - it has no internal function and should not be tied to any net. All other pins have defined roles: OE, FSEL0, FSEL1, SCLK, and SDATA include internal 50 kΩ pullup or pulldown resistors, so they may float safely but are best driven explicitly per system logic states. Leaving them floating does not damage the device but may cause unintended frequency selection or output enable behavior in noisy environments.