DS1877

SFP Controller for Dual Rx Interface

Eases Design of Low-Cost Media Converters and Optical Video Modules


Description

The DS1877 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The device supports all LOS functions for two receivers, and continually monitors for LOS of either channel. Four ADC channels monitor VCC, temperature, and two differential external monitor inputs that can be used to meet all monitoring requirements. Two digital-to-analog converter (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.
DS1877: Typical Operating Circuit DS1877: Typical Operating Circuit Enlarge+

Key Features

  • Meets All SFF-8472 Control and Monitoring Requirements
  • Four Analog Monitor Channels: Temperature, VCC, RSSI1, RSSI2
    • RSSI1 and RSSI2 Support Internal and External Calibration
    • Differential Input
    • Common-Mode Range from GND to VCC
    • Scalable Dynamic Range
    • Internal Direct-to-Digital Temperature Sensor
    • Alarm and Warning Flags for All Monitored Channels
  • Two 10-Bit Delta-Sigma Outputs
  • Each Controlled by 72-Entry Temperature LUT
  • Digital I/O Pins: Four Inputs, Four Outputs
  • Comprehensive Loss-of-Signal (LOS) Detection System
  • Flexible, Two-Level Password Scheme Provides Three Levels of Security
  • 120 Bytes of Password-1 Protected Memory
  • 128 Bytes of Password-2 Protected Memory in Main Device Address
  • 256 Additional Bytes Located at A0h Slave Address
  • Receiver 1 is Accessed at A2h Slave Address
  • Receiver 2 is Accessed at B2h Slave Address
  • I²C-Compatible Interface
  • +2.85V to +3.9V Operating Voltage Range
  • -40°C to +95°C Operating Temperature Range
  • 28-Pin TQFN (5mm x 5mm x 0.75mm) Package

Applications/Uses

  • Dual Rx Video SFPs
  • SFF, SFP, and SFP+ Transceiver Modules
Part Number ADCs Resolution
(bits)
DACs/ Resistors FS Out
(kΩ)
Steps Temp. Sensor Memory VSUPPLY
(V)
Control Interface Budgetary
Price
See Notes
DS1877  3-Input Muxable 13 2 DACs None None Internal EEPROM 2.85 to 3.9 I2C $1.59 @1k
See All Fiber Monitoring and Control (21)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 5266 Quick Reference Guide for Programming the DS1877 SFP Controller

Quality and Environmental Data

Product Reliability Reports: DS1877.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
 

Related Resources