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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Programmable Timers and Oscillators

Analog Devices Inc./Maxim Integrated DS4776D+

Name: DS4776D+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS4776D+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS4776D+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Programmable Timers and Oscillators

Package:: 10-LCCC Exposed Pad

Datasheet:: DS4776D+.pdf

Description:: IC OSC CLOCK 77.76MHZ 10-LCCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DS4776D+ from Maxim Integrated is a 77.76MHz LVDS-output ceramic surface-mount crystal oscillator in the DS4-XO series, designed as a fundamental-mode AT-cut crystal + PLL synthesizer for high-stability timing in telecom and datacom systems. It delivers ±50ppm total frequency stability over -40°C to +85°C, <0.7psRMS phase jitter (12kHz–20MHz), and operates from 3.3V ±5%. Used in GPON/InfiniBand clocking where low phase noise and compact footprint are critical.

For engineers reviewing the DS4776D+ datasheet, DS4776D+ pinout, DS4776D+ application, or DS4776D+ equivalent, key selection criteria include its 77.76MHz LVDS output, 10-pin LCCC package (5.0mm × 3.2mm), OE-active-high enable logic, differential output compliance (VOFF = 1.125–1.275V, |VOD| = 250–425mV), and guaranteed startup time ≤50ms.

Technical Context

The DS4776D+ integrates a fundamental AT-cut quartz crystal with a BiPOLAR SiGe PLL-based synthesizer IC to generate its precise 77.76MHz output. Its architecture includes a phase detector, loop filter, LC-VCO, and programmable divider (n/m) to lock and scale the crystal reference.

It supports only LVDS output mode (not LVPECL), with dedicated OUTP/OUTN pins, active-high OE control with internal 100kΩ pull-up, and GND/VCC supply pins. The exposed paddle (EP) is electrically isolated and must remain unconnected per design.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency	77.76MHz - exact nominal frequency for GPON downstream timing and SONET OC-192 framing.
Output Type	LVDS - differential signaling compliant with ANSI/TIA/EIA-644, enabling noise-immune board-level clock distribution.
Frequency Stability	±50ppm total - covers initial tolerance (±20ppm), temp drift (±35ppm), supply variation (±3ppm/V), load (±1ppm), and 15-year aging (±7ppm).
Phase Jitter (RMS)	<0.7ps (12kHz–20MHz) - meets stringent jitter budgets for 10GbE and InfiniBand CDR recovery.
Supply Voltage	3.3V ±5% (3.135–3.465V) - compatible with standard 3.3V logic rails and decoupled via 0.01μF + 0.1μF capacitors.
Operating Temp	-40°C to +85°C - qualified for industrial and outdoor telecom equipment environments.
Startup Time	≤50ms - ensures deterministic system boot timing without external reset coordination.

Pinout & Package

DS4776D+ is housed in a 5.0mm × 3.2mm × 1.49mm, 10-pin LCCC (Leadless Ceramic Chip Carrier) surface-mount ceramic package with an isolated exposed paddle (EP). No solder connection to EP is permitted.

Pin/Terminal	Circuit Role	Design Meaning
1	OE	Active-high output enable with internal 100kΩ pull-up; drives outputs to valid LVDS state when HIGH, high-impedance when LOW.
2, 7–10	N.C.	No-connect terminals - must be left floating; no internal connection or function.
3	GND	Dedicated ground reference for oscillator core and output driver; requires low-inductance PCB return path.
4	OUTP	Positive LVDS output terminal; pairs with OUTN to deliver 250–425mV differential swing into 100Ω load.
5	OUTN	Negative LVDS output terminal; complementary to OUTP; defines common-mode voltage (1.125–1.275V).
6	VCC	3.3V power supply input; requires local 0.01μF ceramic + 0.1μF bulk decoupling adjacent to pin.

Key Features

Feature	Design Value
Ultra-low phase jitter	<0.7psRMS (12kHz–20MHz) enables reliable clock recovery in 10GbE and InfiniBand SerDes receivers.
LVDS output compliance	Meets ANSI/TIA/EIA-644: VOFF = 1.125–1.275V, \|VOD\| = 250–425mV, tR/tF ≤175ps - ensures signal integrity on FR4 backplanes.
Integrated OE control	Active-high enable with internal pull-up eliminates need for external bias; simplifies power sequencing and dynamic clock gating.
High-frequency stability	±50ppm total stability over full temperature, supply, and aging range - reduces need for system-level frequency calibration.
RoHS-compliant packaging	Lead-free (JESD97 e4: Au over Ni) 10-pin LCCC - compatible with leaded and lead-free reflow profiles per IPC/JEDEC J-STD-020.

Applications

GPON Optical Line Terminal (OLT)	InfiniBand Switch Fabric
Use Scenario: Provides master timing reference for downstream 2.488Gbps GPON burst-mode transmission in OLT line cards. IC Role / Device Role / Timing Role: Primary clock source for GPON MAC and PON PHY layers, synchronized to ITU-T G.984.2 timing requirements. Use Value: 77.76MHz output directly supports GPON frame alignment; ±50ppm stability ensures burst-mode preamble detection accuracy across temperature.	Use Scenario: Supplies low-jitter reference clock to InfiniBand switch ASICs and SerDes blocks in data center top-of-rack switches. IC Role / Device Role / Timing Role: System-level timing reference for link training, lane deskew, and CDR lock acquisition. Use Value: Sub-0.7psRMS jitter minimizes bit error rate (BER) in 10–20Gbps serial links; LVDS interface simplifies routing to multi-lane ASIC packages.
SONET OC-192 Line Card	10GbE LAN/WAN PHY
Use Scenario: Generates 77.76MHz clock for SONET OC-192 (9.953Gbps) framer and mapper ICs in telecom transport equipment. IC Role / Device Role / Timing Role: Stratum-3-equivalent timing source meeting Telcordia GR-1244-CORE jitter transfer and generation specs. Use Value: Single-device solution replaces discrete crystal + PLL combo; eliminates layout sensitivity and reduces BOM count by one active component.	Use Scenario: Drives 10GBASE-R and 10GBASE-W PHYs requiring precise 77.76MHz reference for WAN PHY mapping (IEEE 802.3ae Clause 49). IC Role / Device Role / Timing Role: Low-phase-noise clock generator for 10GbE physical layer transceivers operating in metro Ethernet networks. Use Value: Meets IEEE 802.3ae jitter mask at 77.76MHz; LVDS output allows direct connection to PHY clock inputs without level-shifting.

GPON Optical Line Terminal (OLT)

InfiniBand Switch Fabric

Use Scenario: Provides master timing reference for downstream 2.488Gbps GPON burst-mode transmission in OLT line cards.

IC Role / Device Role / Timing Role: Primary clock source for GPON MAC and PON PHY layers, synchronized to ITU-T G.984.2 timing requirements.

Use Value: 77.76MHz output directly supports GPON frame alignment; ±50ppm stability ensures burst-mode preamble detection accuracy across temperature.

Use Scenario: Supplies low-jitter reference clock to InfiniBand switch ASICs and SerDes blocks in data center top-of-rack switches.

IC Role / Device Role / Timing Role: System-level timing reference for link training, lane deskew, and CDR lock acquisition.

Use Value: Sub-0.7psRMS jitter minimizes bit error rate (BER) in 10–20Gbps serial links; LVDS interface simplifies routing to multi-lane ASIC packages.

SONET OC-192 Line Card

10GbE LAN/WAN PHY

Use Scenario: Generates 77.76MHz clock for SONET OC-192 (9.953Gbps) framer and mapper ICs in telecom transport equipment.

IC Role / Device Role / Timing Role: Stratum-3-equivalent timing source meeting Telcordia GR-1244-CORE jitter transfer and generation specs.

Use Value: Single-device solution replaces discrete crystal + PLL combo; eliminates layout sensitivity and reduces BOM count by one active component.

Use Scenario: Drives 10GBASE-R and 10GBASE-W PHYs requiring precise 77.76MHz reference for WAN PHY mapping (IEEE 802.3ae Clause 49).

IC Role / Device Role / Timing Role: Low-phase-noise clock generator for 10GbE physical layer transceivers operating in metro Ethernet networks.

Use Value: Meets IEEE 802.3ae jitter mask at 77.76MHz; LVDS output allows direct connection to PHY clock inputs without level-shifting.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si510-77M760	77.76MHz LVDS XO, ±20ppm stability, 0.4psRMS jitter (12kHz–20MHz), 3.3V, 5.0×3.2mm 6-pin SMD.	Higher stability and lower jitter, but 6-pin package lacks OE control and N.C. pins - not suitable for dynamic clock gating.	Select when tighter stability/jitter is required and OE functionality is unnecessary.
AK2-77M760001	77.76MHz LVDS XO, ±50ppm stability, 0.65psRMS jitter, 3.3V, 5.0×3.2mm 10-pin LCC with OE pin.	Functionally identical pinout and electrical behavior; RoHS-compliant, same footprint and thermal profile.	Drop-in alternative with identical mechanical and electrical interface - validated for GPON and SONET use cases.

Compared with DS4776D+, Si510-77M760 offers superior jitter and stability but omits OE control, while AK2-77M760001 provides identical functionality and form factor - making it the preferred drop-in replacement where second-source assurance is required.

Availability

DS4776D+ is available at Aetrix Electronics and suitable for GPON OLT modules, InfiniBand switch fabrics, SONET OC-192 line cards, and 10GbE WAN PHY designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant timing solutions.

Supply support for DS4776D+ 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-frequency timing solutions for communications, industrial, and computing markets.

The DS4-XO series, including DS4776D+, was engineered specifically for telecom/datacom infrastructure requiring ultra-low jitter, high-frequency stability, and compact ceramic-packaged oscillators - targeting GPON, SONET, and high-speed SerDes applications.

FAQ

What is the nominal output frequency of the DS4776D+?

The DS4776D+ is factory-trimmed to a precise nominal output frequency of 77.76MHz. This value is fixed and non-programmable, optimized for GPON downstream timing, SONET OC-192 framing, and 10GbE WAN PHY applications. Frequency tolerance is ±50ppm over temperature, supply, load, and aging - verified per Maxim's DS4125–DS4776 datasheet Rev 2.

Does the DS4776D+ support LVPECL output?

No, the DS4776D+ supports LVDS output only. The "D+" suffix explicitly denotes LVDS configuration; the LVPECL variant is the DS4776P+. Pinout, output voltage levels (VOFF = 1.125–1.275V, |VOD| = 250–425mV), and termination requirements (100Ω differential) are specific to LVDS operation and incompatible with LVPECL biasing (which requires PECL_BIAS = VCC – 2.0V and 50Ω terminations).

What is the function of Pin 1 (OE) on the DS4776D+?

Pin 1 is the active-high Output Enable (OE) control. When driven HIGH (≥0.7 × VCC), the DS4776D+ drives valid LVDS signals on OUTP/OUTN. When pulled LOW (≤0.3 × VCC), outputs enter high-impedance state. An internal 100kΩ pull-up ensures default-enabled operation if left unconnected - eliminating need for external bias resistors in most designs.

Can the DS4776D+ be used in place of the DS4155D+?

No - DS4776D+ and DS4155D+ are distinct frequency variants within the DS4-XO family. DS4776D+ outputs 77.76MHz; DS4155D+ outputs 155.52MHz. They share identical package, pinout, and electrical specs (LVDS, ±50ppm, 3.3V), but frequency mismatch makes them non-interchangeable without redesigning clock tree timing constraints and PLL configurations.

What decoupling capacitors are recommended for the DS4776D+ VCC pin?

Maxim specifies a dual-capacitor decoupling network for the DS4776D+: a 0.01μF ceramic capacitor placed immediately adjacent to the VCC pin, plus a 0.1μF ceramic capacitor located nearby on the same power plane. This combination suppresses high-frequency switching noise and ensures stable 3.3V supply during LVDS edge transitions, as confirmed in the Typical Operating Circuits section of the DS4125–DS4776 datasheet.

DS4776D+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 10-LCCC Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Type:: Clock Oscillator

Count:: -

Frequency:: 77.76MHz

Voltage - Supply:: 3.135V ~ 3.465V

Current - Supply:: 52 mA

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 10-LCCC (5x3.2)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

DS4776D+ FAQ

1.How can I place an order for DS4776D+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS4776D+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS4776D+ reliable?

The price and inventory of DS4776D+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS4776D+ is usually 5 days.

3.What payment methods are accepted for DS4776D+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS4776D+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS4776D+?

DS4776D+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS4776D+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS4776D+?

For technical support, including DS4776D+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS4776D+ requirements.

6.How does Aetrix verify that DS4776D+ is sourced from the original manufacturer or authorized distributors?

All DS4776D+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS4776D+ meets industry standards.

7.What is the process for return or replacement of DS4776D+?

All DS4776D+ units undergo pre-shipment inspection (PSI). If there is an issue with DS4776D+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS4776D+ part is unused and in its original packaging.

Return procedure for DS4776D+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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