Skyworks Solutions Inc. 511ECA-CBAG

Overview

511ECA-CBAG from Skyworks Solutions is a factory-programmed, low-jitter crystal oscillator (XO) with DSPLL-based frequency synthesis, delivering 100 kHz to 250 MHz output across ±30 ppm total stability (including 10-year aging), 3.3 V supply, LVPECL output, and –40°C to +85°C operation in a 5 × 7 mm 6-pin package. It serves as a precision clock source for high-speed serial interfaces requiring deterministic jitter performance.

For engineers reviewing the 511ECA-CBAG datasheet, 511ECA-CBAG pinout, 511ECA-CBAG application, or 511ECA-CBAG equivalent, this device supports critical timing requirements in PCIe Gen3/Gen4, 10G/25G Ethernet PHYs, and FPGA transceiver reference clocks where sub-1.3 ps RMS period jitter and robust supply noise rejection are mandatory.

Technical Context

The 511ECA-CBAG implements Skyworks' DSPLL architecture with a fixed-crystal resonator and on-chip synthesizer, eliminating crystal variability per frequency while maintaining <1.3 ps RMS period jitter (LVPECL, 156.25 MHz). Its integrated LDO regulator provides >3.0 ps/mV supply-induced jitter suppression at 10–500 kHz noise frequencies.

Pin 1 is OE (active-high, internal pull-up), pins 4 and 5 deliver complementary LVPECL outputs (CLK+/CLK−), and pin 6 supplies 3.3 V. The device supports runt suppression on power-up and OE assertion, ensuring glitch-free clock enablement in synchronous systems.

Key Specifications

Pinout & Package

511ECA-CBAG uses a 5 × 7 mm, 6-pin surface-mount package (JEDEC MO-220, variant WWGA-6). Pin 1 = OE (active-high, internal pull-up); Pin 2 = NC; Pin 3 = GND; Pin 4 = CLK+; Pin 5 = CLK−; Pin 6 = VDD (3.3 V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si510ECB156M250AAG and AK2-156.250MHZ-EFE, the 511ECA-CBAG uniquely combines LVPECL output, ±30 ppm total stability including 10-year aging, and DSPLL-based jitter performance below 1.3 ps RMS-making it the only option qualified for PCIe Gen4 and OTN Stratum-3 timing.

Availability

511ECA-CBAG is available at Aetrix Electronics and suitable for PCIe Gen4 server motherboards, 25G Ethernet optical transceivers, and telecom line card designs requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for 511ECA-CBAG 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and power management ICs.

The Si510/511 family was designed specifically for high-reliability, programmable clock generation in datacenter, telecom, and enterprise networking equipment where flexibility, low jitter, and long-term stability are non-negotiable.

FAQ

What output format and supply voltage does the 511ECA-CBAG use?

The 511ECA-CBAG is configured for LVPECL output and 3.3 V supply voltage, as indicated by the "E" (2.5 V LVPECL) and "C" (3.3 V CMOS) codes in Skyworks' part numbering scheme - but cross-referenced against the ordering guide, "511ECA" maps to 3.3 V LVPECL. This matches Table 1's 3.3 V ±10% supply range and Table 5's LVPECL jitter specs. The 511ECA-CBAG delivers true differential LVPECL signaling with 0.8 VPPSE swing into 50 Ω.

Does the 511ECA-CBAG support differential clock outputs?

Yes, the 511ECA-CBAG provides fully differential LVPECL outputs on pins 4 (CLK+) and 5 (CLK−), requiring 50 Ω termination to VDD − 2 V per output. Its differential architecture achieves 48–52% duty cycle and suppresses common-mode noise - critical for high-speed SERDES interfaces. The datasheet confirms LVPECL functionality for Si511 variants with OE on pin 1, matching the 511ECA-CBAG's pinout and electrical specs in Tables 4–6.

What is the total frequency stability specification for the 511ECA-CBAG?

The 511ECA-CBAG is graded to Frequency Stability Grade C, providing ±30 ppm total stability. This includes initial calibration error, operating temperature variation (±20 ppm), supply voltage change, load variation, shock/vibration, and 10-year aging at 40°C - as explicitly defined in Table 2 footnote. This grade exceeds Stratum-3 telecom requirements and supports PCIe Gen4 reference clock tolerance.

How does the 511ECA-CBAG handle power supply noise?

The 511ECA-CBAG integrates an on-chip LDO regulator that attenuates supply noise, limiting additive jitter to ≤3.5 ps RMS when 100 mVPP sinusoidal noise is applied to VDD at 10–1000 kHz - per Table 4's JPSR parameter. This allows direct connection to moderately noisy DC/DC rails without external filtering, simplifying power delivery network design for dense PCB layouts.

Is the 511ECA-CBAG pin-compatible with other Si510/511 variants?

Yes, the 511ECA-CBAG uses the standard Si511 6-pin 5 × 7 mm footprint with OE on pin 1, GND on pin 3, CLK+/CLK− on pins 4/5, and VDD on pin 6 - matching the pinout in Table 13 and Figure 6. All Si511 variants share identical mechanical dimensions and land patterns, enabling layout reuse across frequency, voltage, and stability options without PCB revision.