DS1877 Datasheet, PDF (1/65 Pages) Maxim Integrated Products – SFP Controller for Dual Rx Interface

19-5188; Rev 1; 4/10
SFP Controller for Dual Rx Interface
General Description
The DS1877 controls and monitors all functions for SFF,
SFP, and SFP+ modules including all SFF-8472 func-
tionality. 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.
Applications
SFF, SFP, and SFP+ Transceiver Modules
Dual Rx Video SFPs
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
DS1877T+
-40NC to +95NC 28 TQFN-EP*
DS1877T+T&R
-40NC to +95NC 28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
Features
S Meets All SFF-8472 Control and Monitoring
Requirements
S 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
S Two 10-Bit Delta-Sigma Outputs
Each Controlled by 72-Entry Temperature LUT
S Digital I/O Pins: Four Inputs, Four Outputs
S Comprehensive Loss-of-Signal (LOS) Detection
System
S Flexible, Two-Level Password Scheme Provides
Three Levels of Security
S 120 Bytes of Password-1 Protected Memory
S 128 Bytes of Password-2 Protected Memory in
Main Device Address
S 256 Additional Bytes Located at A0h Slave
Address
S Receiver 1 is Accessed at A2h Slave Address
S Receiver 2 is Accessed at B2h Slave Address
S I²C-Compatible Interface
S +2.85V to +3.9V Operating Voltage Range
S -40NC to +95NC Operating Temperature Range
S 28-Pin TQFN (5mm x 5mm x 0.75mm) Package
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