Renesas 8N3DV85KC-0203CDI8

Overview

8N3DV85KC-0203CDI8 from Renesas Electronics (formerly IDT) is a LVPECL dual-frequency programmable voltage-controlled crystal oscillator (VCXO) with factory-programmed frequencies in two bands: 15.476–866.67 MHz and 975–1,300 MHz, ±218 Hz frequency resolution, and RMS phase jitter of 0.46 ps (12 kHz–20 MHz) at 622.08 MHz. It serves as a high-stability timing source in wireless infrastructure baseband units.

For engineers reviewing the 8N3DV85KC-0203CDI8 datasheet, 8N3DV85KC-0203CDI8 pinout, 8N3DV85KC-0203CDI8 application, or 8N3DV85KC-0203CDI8 equivalent, this page delivers verified electrical specs, FSEL-controlled dual-frequency switching behavior, LVPECL output termination guidance, VCXO pull-range programmability, and industrial-temperature (-40°C to +85°C) operation confirmed for telecom clocking systems.

Technical Context

The 8N3DV85KC-0203CDI8 integrates a 114.285 MHz fundamental-mode crystal with a fourth-generation FemtoClock® NG PLL featuring fractional-N feedback (MINT + MFRAC), pre-divider (P), and post-divider (N) to synthesize output frequencies across two disjoint bands. Its architecture supports immediate frequency switching via the LVCMOS/LVTTL-compatible FSEL pin without relocking delay.

It implements a VCO operating at 1.95–2.6 GHz, followed by integer division, enabling low-phase-noise synthesis while maintaining VCXO tunability. Control voltage (VC) linearity is specified at ±0.4% BSL variation over 10–90% VCC, with oscillator gain programmable from 7.57 to 477.27 ppm/V (3.3 V supply) or 10–630 ppm/V (2.5 V supply).

Key Specifications

Pinout & Package

6-lead ceramic VFQFN package (5 mm × 7 mm × 1.55 mm), lead-free (RoHS 6), top-marked per Table 8 in datasheet revision A. Pin 1 index located at corner adjacent to metalized edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si510-PROG and 8A34001, the 8N3DV85KC-0203CDI8 uniquely delivers deterministic, pin-controlled dual-frequency switching within a compact 5 mm × 7 mm ceramic package - making it optimal for space-constrained, low-latency telecom timing where hardware-selectable references are mandatory.

Availability

8N3DV85KC-0203CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport equipment, and high-speed data center switches requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 8N3DV85KC-0203CDI8 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 for industrial, automotive, and communications markets.

The 8N3DV85KC-0203CDI8 belongs to Renesas' FemtoClock® NG programmable timing portfolio, engineered specifically for high-frequency, low-jitter clock generation in carrier-grade telecom and networking infrastructure where dual-reference agility and phase-noise performance are critical.

FAQ

What is the factory-programmed frequency pair for 8N3DV85KC-0203CDI8?

The 8N3DV85KC-0203CDI8 is configured with two factory-programmed frequencies selected at order time; the "0203" suffix indicates default frequencies of 122.88 MHz and 153.6 MHz, both within the 15.476–866.67 MHz band. These values are permanently stored in on-chip ROM and cannot be altered in the field. The full list of supported combinations is defined in the FemtoClock NG Ceramic-Package XO and VCXO Ordering Product Information document.

Does 8N3DV85KC-0203CDI8 support both 2.5 V and 3.3 V supplies simultaneously?

No, the 8N3DV85KC-0203CDI8 operates from a single supply voltage - either 2.5 V ±5% or 3.3 V ±5%, as determined by the option code (B/F for 2.5 V; A/E/K for 3.3 V). The "K" in 8N3DV85KC-0203CDI8 specifies 3.3 V ±5% supply with ±20 ppm frequency stability. Mixing voltages or applying both rails will damage the device.

How is the VCXO pull range set for 8N3DV85KC-0203CDI8?

The VCXO pull range of the 8N3DV85KC-0203CDI8 is factory-programmed and fixed per order - the "0203" code corresponds to a typical ±200 ppm pull range. This value is stored in internal configuration registers and determines the frequency deviation achievable via the VC pin. Pull range cannot be modified after shipment and is independent of supply voltage.

Can 8N3DV85KC-0203CDI8 drive AC-coupled LVPECL loads?

Yes, but only with proper DC biasing. The 8N3DV85KC-0203CDI8 LVPECL outputs require termination to VCC – 2 V. For AC-coupled interfaces, a Thevenin or Thevenin-equivalent network (e.g., 84 Ω to VCC and 84 Ω to ground for 3.3 V) must establish the correct common-mode voltage at the receiver input. Direct AC coupling without biasing violates LVPECL common-mode specifications and causes signal integrity failure.

What is the maximum modulation bandwidth supported on the VC pin of 8N3DV85KC-0203CDI8?

The VC pin of the 8N3DV85KC-0203CDI8 supports a modulation bandwidth of 100 kHz, as specified in Table 5B of the datasheet. This allows closed-loop PLL applications (e.g., clock cleanup or jitter attenuation) to inject correction signals up to 100 kHz without significant phase lag or attenuation - sufficient for most telecom loop filter designs targeting SONET/SDH or Ethernet applications.