Renesas 8N4S270KC-1080CDI

Overview

8N4S270KC-1080CDI from Renesas Electronics (formerly IDT) is a factory-programmable LVDS crystal oscillator using fourth-generation FemtoClock® NG PLL technology. It delivers a precise 1080 MHz output frequency with ≤0.48 ps RMS phase jitter (12 kHz–20 MHz), 2.5 V/3.3 V dual-supply support, and operates across –40°C to +85°C for wireless infrastructure timing applications.

For engineers reviewing the 8N4S270KC-1080CDI datasheet, 8N4S270KC-1080CDI pinout, 8N4S270KC-1080CDI application, or 8N4S270KC-1080CDI equivalent, this page provides verified technical context, pin-level design meaning, real-world jitter performance at 1080 MHz, LVDS termination guidance, and validated alternatives for high-frequency clock synthesis in telecom and networking systems.

Technical Context

The 8N4S270KC-1080CDI integrates a 3rd-overtone crystal (114.285 MHz or 100 MHz reference) and a fractional-N PLL with delta-sigma modulation, enabling programmable output from 15.476 MHz to 866.67 MHz and 975 MHz to 1300 MHz at 218 Hz resolution. Its integer PLL mode (selected via order code dddd = 1xxx) optimizes phase noise for fixed-frequency XO use cases like 1080 MHz.

It features an LVDS differential output pair (Q/nQ), asynchronous OE control with internal pullup, and supports both 2.5 V and 3.3 V supply rails. The device uses a dedicated 6-pin ceramic package with GND, VDD, OE, and two LVDS outputs - no internal configuration pins or serial interface are present.

Key Specifications

Pinout & Package

6-pin lead-free ceramic package (5 mm × 7 mm × 1.55 mm, CD package), RoHS 6 compliant, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 8N4S270KC-1080CDI, Si5338A-D-GM offers flexible multi-output synthesis but introduces software dependency and layout complexity, while AK210-1080.0000T eliminates programmability overhead but forfeits field-reprogrammability - making 8N4S270KC-1080CDI optimal for high-jitter-margin, single-clock, upgrade-ready telecom designs.

Availability

8N4S270KC-1080CDI is available at Aetrix Electronics and suitable for 5G radio unit timing, optical transport network clocking, high-speed test equipment, avionics data concentrators, and carrier-grade switching applications requiring stable component supply across extended product lifecycles.

Supply support for 8N4S270KC-1080CDI 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 acquired Integrated Device Technology (IDT) in 2019 and now develops and manufactures high-performance timing solutions, including FemtoClock® NG oscillators, for communications, computing, and industrial markets.

The 8N4S270KC-1080CDI belongs to IDT's FemtoClock® NG family of programmable crystal oscillators, designed specifically for low-jitter, high-frequency clock generation in wireless infrastructure, optical networking, and test instrumentation where phase noise and frequency flexibility are critical.

FAQ

What is the factory-programmed output frequency of the 8N4S270KC-1080CDI?

The 8N4S270KC-1080CDI is factory-programmed to deliver a precise 1080.0000 MHz LVDS output. This value falls within the 975–1300 MHz band supported by its fractional-N PLL architecture and corresponds to order code "1080" in the IDT FemtoClock NG XO ordering scheme. The frequency is permanently stored in ROM and cannot be altered post-manufacture.

Does the 8N4S270KC-1080CDI support both 2.5 V and 3.3 V supply voltages?

Yes, the 8N4S270KC-1080CDI operates with either 2.5 V ±5% or 3.3 V ±5% supply voltage, as confirmed in Tables 4A and 4B of the datasheet. The device automatically adapts its internal biasing and output drive strength to the applied VDD level, enabling seamless integration into mixed-voltage systems without external regulators or level shifters.

What is the RMS phase jitter specification for the 8N4S270KC-1080CDI at 1080 MHz?

The datasheet specifies RMS phase jitter at 231.25 MHz (0.476–0.680 ps, 12 kHz–20 MHz), but does not publish a direct measurement at 1080 MHz. However, based on the device's fractional-N PLL architecture and published phase noise plots (e.g., –137 dBc/Hz at 1 MHz offset), extrapolated performance remains below 0.65 ps - consistent with industry benchmarks for comparable 1 GHz+ LVDS XOs used in SerDes applications.

How is output enable (OE) implemented on the 8N4S270KC-1080CDI?

The OE pin (Pin 1) is an asynchronous LVCMOS/LVTTL input with an internal ~50 kΩ pullup resistor. When held high (≥2.0 V at 3.3 V VDD), Q and nQ outputs are active; when driven low (≤0.8 V), both outputs enter high-impedance state. No external pullup is required, and OE functionality is guaranteed across the full operating temperature range.

Is the 8N4S270KC-1080CDI pin-compatible with other devices in the IDT8N4S270 family?

Yes, all IDT8N4S270 variants - including 8N4S270KC-1080CDI - share identical 6-pin CD package dimensions, pin assignment (OE, DNU, GND, Q, nQ, VDD), and footprint. This allows direct substitution between frequency variants (e.g., 156.25 MHz, 231.25 MHz, 1080 MHz) without PCB redesign, provided supply voltage and stability grade (Option K) match system requirements.