Renesas 8N4S270KC-1080CDI8

Overview

8N4S270KC-1080CDI8 from IDT is a factory-frequency-programmable LVDS crystal oscillator using fourth-generation FemtoClock® NG technology, delivering 231.25 MHz output with 0.476 ps typical RMS phase jitter (12 kHz–20 MHz), 2.5 V/3.3 V supply support, and operation from –40°C to +85°C in a RoHS-compliant 6-pin ceramic 5 mm × 7 mm × 1.55 mm package for wireless infrastructure timing applications.

For engineers reviewing the 8N4S270KC-1080CDI8 datasheet, 8N4S270KC-1080CDI8 pinout, 8N4S270KC-1080CDI8 application, or 8N4S270KC-1080CDI8 equivalent, this page provides verified frequency programming range (15.476–866.67 MHz / 975–1300 MHz), LVDS differential output specs, OE control behavior, phase noise performance at 231.25 MHz, and industrial-grade thermal reliability data.

Technical Context

The 8N4S270KC-1080CDI8 integrates a 3rd-overtone crystal (100 MHz or 114.285 MHz fXTAL) with a fractional-N PLL featuring 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers, enabling 218 Hz frequency resolution. Its architecture supports both integer and fractional PLL modes-integer mode used for 1xxx order codes yields lower phase noise (e.g., 0.232 ps @ 231.25 MHz, 12 kHz–20 MHz).

It implements an asynchronous LVCMOS/LVTTL-compatible OE input controlling high-impedance state on Q/nQ outputs, uses internal pullup on OE (50 kΩ typical), and delivers LVDS differential outputs with VOD = 247–454 mV and VOS = 1.125–1.375 V across 2.5 V/3.3 V supplies, meeting JEDEC 65 jitter definitions.

Key Specifications

Pinout & Package

6-pin ceramic surface-mount package (CD), 5 mm × 7 mm × 1.55 mm, RoHS 6-compliant, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 8N4S270KC-1080CDI8, Si5338A-B-GM offers configurability at the cost of complexity and power, while AK212-023125 trades OE control and programmability for lower unit cost and identical jitter performance in fixed-frequency deployments.

Availability

8N4S270KC-1080CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport, and high-speed test equipment requiring stable component supply, guaranteed long-term availability, and industrial-temperature-rated timing precision.

Supply support for 8N4S270KC-1080CDI8 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 global leader in timing, memory interface, and RF power solutions, founded in 1980 and headquartered in San Jose, California.

The IDT8N4S270 family was designed specifically for high-performance, factory-programmable crystal oscillators targeting wireless infrastructure, telecom switching, and networking equipment demanding ultra-low jitter and industrial reliability.

FAQ

What is the factory-programmed output frequency of the 8N4S270KC-1080CDI8?

The 8N4S270KC-1080CDI8 is factory-programmed to 231.25 MHz, as indicated by the "1080" order code suffix. This frequency is fixed and non-reprogrammable in the field. The device uses a 100 MHz crystal reference with integer PLL feedback to achieve this output, yielding optimized phase noise performance of 0.476 ps typical RMS jitter (12 kHz–20 MHz). No external configuration is required for operation at this frequency.

Does the 8N4S270KC-1080CDI8 support both 2.5 V and 3.3 V supply voltages?

Yes, the 8N4S270KC-1080CDI8 operates with either 2.5 V ±5% or 3.3 V ±5% supply voltage. DC characteristics-including VOD (247–454 mV), VOS (1.125–1.375 V), and IDD (129–160 mA)-are fully specified across both rails. The device automatically adapts its internal biasing; no external configuration is needed. Layout best practices require separate 0.1 µF bypass capacitors directly adjacent to the VDD pin for each supply condition.

How does the OE pin function on the 8N4S270KC-1080CDI8?

The OE (Output Enable) pin on the 8N4S270KC-1080CDI8 is an asynchronous LVCMOS/LVTTL input with internal 50 kΩ pullup. When OE = 1 (default), Q and nQ outputs are active; when OE = 0, both outputs enter high-impedance state. It is not a sleep mode-core oscillator remains running. This allows dynamic clock gating in FPGA- or ASIC-controlled systems without affecting frequency stability or startup timing of the 8N4S270KC-1080CDI8.

What is the phase noise performance of the 8N4S270KC-1080CDI8 at 231.25 MHz?

At 231.25 MHz output, the 8N4S270KC-1080CDI8 achieves –88 dBc/Hz at 100 Hz offset, –110 dBc/Hz at 1 kHz, –123 dBc/Hz at 10 kHz, –125 dBc/Hz at 100 kHz, –137 dBc/Hz at 1 MHz, and –141 dBc/Hz at 10 MHz offset. These values reflect integer PLL operation (1xxx order code), which minimizes close-in and broadband phase noise-critical for high-order QAM and coherent optical systems relying on the 8N4S270KC-1080CDI8.

Is the 8N4S270KC-1080CDI8 RoHS-compliant and what is its package footprint?

Yes, the 8N4S270KC-1080CDI8 is RoHS 6-compliant (lead-free) and packaged in a 6-pin ceramic CD package measuring 5 mm × 7 mm × 1.55 mm. The package has no exposed thermal pad; pins 4 (Q) and 5 (nQ) are differential LVDS outputs requiring controlled 100 Ω differential impedance routing. Pin 2 (DNU) must remain unconnected. Full mechanical drawings and solder profile recommendations are provided in the official IDT8N4S270 datasheet revision A.