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PDF DS1877 Data sheet ( Hoja de datos )
| Número de pieza | DS1877 | |
| Descripción | SFP Controller For Dual Rx Interface | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5188; Rev 1; 4/10
www.DataSheet4U.com
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
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
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SFP Controller for Dual Rx Interface
ABSOLUTE MAXIMUM RATINGS
Voltage Range on RSSI1_, RSSI2_, INX, LOS1,
and LOS2 Pins Relative to Ground...... -0.5V to (VCC + 0.5V)*
Voltage Range on VCC, SDA, SCL, OUTX, FAULT,
RSELOUT, and LOSOUT Pins Relative to Ground....-0.5V to +6V
Continuous Power Dissipation
28-Pin TQFN (derate 34.5mW/NC) above +70NC....2758.6mW
*Subject to not exceeding +6V.
Operating Temperature Range........................... -40NC to +95NC
Programming Temperature Range........................ 0NC to +95NC
Storage Temperature Range............................ -55NC to +125NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40NC to +95NC, unless otherwise noted.)
PARAMETER
Main Supply Voltage
High-Level Input Voltage
(SDA, SCL)
Low-Level Input Voltage
(SDA, SCL)
SYMBOL
VCC (Note 1)
VIH:1
VIL:1
CONDITIONS
High-Level Input Voltage
(FAULT, RSEL, INX, LOS1,
LOS2)
VIH:2
Low-Level Input Voltage
(FAULT, RSEL, INX, LOS1,
LOS2)
VIL:2
MIN
+2.85
0.7 x
VCC
-0.3
2.0
TYP
MAX
+3.9
VCC +
0.3
0.3 x
VCC
UNITS
V
V
V
VCC +
0.3
V
-0.3
+0.8
V
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.85V to +3.9V, TA = -40NC to +95NC, unless otherwise noted.)
PARAMETER
Supply Current
Output Leakage (SDA, OUTX,
RSELOUT, LOSOUT, FAULT)
SYMBOL
ICC (Notes 1, 2)
ILO
CONDITIONS
Low-Level Output Voltage
IOL = 4mA
(SDA, OUTX, RSELOUT, LOSOUT,
VOL
DAC1, DAC2, FAULT)
IOL = 6mA
High-Level Output Voltage
(DAC1, DAC2)
DAC1 and DAC2 Before LUT
Recall
Input Leakage Current
(SCL, RSEL, INX, LOS1, LOS2)
Digital Power-On Reset
Analog Power-On Reset
VOH
IOH = 4mA
ILI
POD
POA
MIN TYP MAX UNITS
2.5 10
mA
1 FA
VCC -
0.4
0.4
V
0.6
V
10 100 nA
1 FA
1.0 2.2 V
2.0
2.75
V
5
5 Page 
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VCC
SDA
SCL
VCC
RSSI1P
RSSI1N
RSSI2P
RSSI2N
RSEL
INX
LOS1
LOS2
SFP Controller for Dual Rx Interface
Block Diagram
VCC
I2C
INTERFACE
EEPROM
256 BYTES
AT A0h
MAIN MEMORY AT A2h/B2h
EEPROM/SRAM
A/D CONFIGURATION/RESULTS,
SYSTEM STATUS/CONTROL BITS,
ALARMS/WARNINGS,
LOOKUP TABLES,
USER MEMORY
10-BIT
DELTA-SIGMA DAC
10-BIT
DELTA-SIGMA DAC
REFIN
DAC1
DAC2
TEMPERATURE
SENSOR
13-BIT
ADC
8-BIT
QTs
POWER-ON
ANALOG
INTERRUPT
DS1877
LOGIC
CONTROL
FAULT
RSELOUT
OUTX
LOSOUT
GND
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS1877.PDF ] | |
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