Renesas 8N3SV75LC-0177CDI

Overview

8N3SV75LC-0177CDI from Renesas Electronics (formerly IDT) is a factory-programmed LVPECL voltage-controlled crystal oscillator (VCXO) with fourth-generation FemtoClock® NG PLL synthesis. It delivers 156.25 MHz output at ±20 ppm total stability over -40°C to +85°C, 0.5 ps RMS phase jitter (12 kHz–20 MHz), and supports 2.5 V or 3.3 V supply for telecom timing and wireless infrastructure clocking.

For engineers reviewing the 8N3SV75LC-0177CDI datasheet, 8N3SV75LC-0177CDI pinout, 8N3SV75LC-0177CDI application, or 8N3SV75LC-0177CDI equivalent, key selection criteria include its programmable APR (±4.5 to ±754.5 ppm), OE-controlled LVPECL differential outputs, VCXO control voltage linearity (±0.1% BSL), and ceramic 5 mm × 7 mm × 1.55 mm package with RoHS 6 compliance.

Technical Context

The 8N3SV75LC-0177CDI integrates a 114.285 MHz third-overtone crystal oscillator with a fractional-N PLL featuring 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers, enabling precise frequency synthesis across two bands: 15.476–866.67 MHz and 975–1300 MHz. Its delta-sigma modulator shapes phase noise while maintaining 218 Hz frequency resolution.

It uses a 3rd-overtone crystal reference and supports configurable oscillator gain (7.57–477.27 ppm/V at 3.3 V), modulation bandwidth up to 100 kHz, and LVCMOS/LVTTL-compatible OE input with internal 50 kΩ pullup. The device operates with VCC = 2.5 V or 3.3 V and VEE = 0 V, and features differential Q/nQ LVPECL outputs terminated to VCC – 2 V.

Key Specifications

Pinout & Package

6-lead ceramic VFQFN (CD package), 5 mm × 7 mm × 1.55 mm, RoHS 6 compliant, lead-free, bottom-exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si510-PROG and AK210-156.25MHZ, the 8N3SV75LC-0177CDI uniquely combines factory-programmed LVPECL output, analog VCXO tuning, OE control, and ±33 ppm 10-year stability in a single 6-pin ceramic package-making it optimal for telecom infrastructure where jitter, tunability, and reliability are co-constrained.

Availability

8N3SV75LC-0177CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport network line cards, and 10G/25G Ethernet PHY designs requiring stable component supply, long-lifecycle availability, and guaranteed RoHS 6 compliance.

Supply support for 8N3SV75LC-0177CDI 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 delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and communications markets.

The 8N3SV75LC-0177CDI belongs to Renesas' FemtoClock® NG programmable timing family, engineered specifically for high-performance, low-jitter clock generation in telecom and networking infrastructure where phase noise, stability, and programmability are critical.

FAQ

What is the factory-programmed output frequency of the 8N3SV75LC-0177CDI?

The 8N3SV75LC-0177CDI is factory-programmed to 156.25 MHz, as indicated by the "0177" order code suffix per Renesas' FemtoClock NG ordering documentation. This frequency is fixed and non-reprogrammable after shipment. The device retains full VCXO functionality-its output can be tuned around 156.25 MHz using the VC pin within its programmed absolute pull range (APR), which for this variant is ±33 ppm total stability over 10 years.

Does the 8N3SV75LC-0177CDI support both 2.5 V and 3.3 V supply voltages?

Yes, the 8N3SV75LC-0177CDI supports either 2.5 V ±5% or 3.3 V ±5% supply voltage, selected at time of order. The "K" option code in 8N3SV75LC-0177CDI specifies 3.3 V operation with ±20 ppm temperature stability. Supply voltage must be stable and well-decoupled; typical supply current is 130–160 mA at 3.3 V. Using 2.5 V reduces power but also lowers LVPECL output swing (0.4–1.0 Vpp vs. 0.6–1.0 Vpp at 3.3 V).

How is the 8N3SV75LC-0177CDI's VCXO pull range configured?

The absolute pull range (APR) of the 8N3SV75LC-0177CDI is factory-programmed and fixed; for this part, APR is ±4.5 to ±754.5 ppm, with the specific value determined by the order code. The oscillator gain (KV) is 7.57–477.27 ppm/V at 3.3 V, meaning a 1 V change on the VC pin shifts frequency by that amount. Linearity is ±0.1% BSL, ensuring predictable tuning behavior across the full 0–VCC VC range without calibration.

What termination is required for the LVPECL outputs of the 8N3SV75LC-0177CDI?

The Q and nQ LVPECL outputs of the 8N3SV75LC-0177CDI must be terminated to VCC – 2 V using matched 50 Ω transmission lines. For 3.3 V operation, standard termination uses two 84 Ω resistors (to ground and VCC) plus a 125 Ω resistor between outputs. For 2.5 V, termination approximates 50 Ω to ground. Improper termination causes signal integrity degradation, increased jitter, and duty cycle distortion-details are in Figures 1A/B and 2A–C of the datasheet.

Is the 8N3SV75LC-0177CDI pin-compatible with other IDT8N3SV75 variants?

Yes, all IDT8N3SV75 VCXOs-including 8N3SV75LC-0177CDI-share identical 6-pin CD package pinout (VC, OE, VEE, Q, nQ, VCC) and electrical interface. Differences lie only in factory-programmed parameters: output frequency, APR, supply voltage, and stability grade. No PCB layout change is needed when substituting within the same package code (CD) and pin count (6), provided OE logic polarity and VC range compatibility are verified.