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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 V_CC, 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.

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Meets All SFF-8472 Control and Monitoring Requirements

Four Analog Monitor Channels: Temperature, V_CC, RSSI1, RSSI2

• RSSI1 and RSSI2 Support Internal and External Calibration
• Differential Input
• Common-Mode Range from GND to V_CC
• 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