Rainbow Electronics DS1862 - Manual (Page 7)

DS1862
XFP Laser Control and Digital Diagnostic IC
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FAST ALARMS AND V
CC
FAULT CHARACTERISTICS
(V CC3 = +2.9V to +5.5V, V CC2 = +1.6V to +3.6V, T A = -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
HIGHBIAS and TX-P Threshold
FS
(Note 10) 2.48 2.5 2.52 mA
V CC2/3 Fault Asserted
Falling Edge Delay
↓ V
CC2/3
(Note 11)
75 ms
QT Temperature Coefficient -3 +3 %
QT Voltage Coefficient 0.5 %/V
QT FS Trim Accuracy (4.2V,
+25°C)
2.480 2.500 2.520 mA
QT Accuracy (Trip) (INL) -2 0 +2 LSB
QT Voltco 0.5 %/V
QT Tempco 1.5 3 %
Note 1: All voltages are referenced to ground. Current into IC is positive, out of the IC is negative.
Note 2: Secondary power supply is used to support optional variable power-supply feature of the XFP module. If V CC2 is not used,
(i.e., signal conditioners using 3.3V supply) V CC2 should be connected to the V CC3 .
Note 3: Input signals (i.e., TX-D, MOD-DESEL, and P-DOWN/RST have internal pullup resistors.
Note 4: Guaranteed by design. Simulated over process and 50µA < I BMD < 1500µA.
Note 5: C B —total capacitance of one bus line in picofarads.
Note 6: EEPROM write begins after a stop condition occurs.
Note 7: This is the maximum and minimum voltage on the MODSET and BIASSET pins required to meet accuracy and drift specifi-
cations.
Note 8: For V THRSET , offset may be as much as 10mV.
Note 9: This is the uncalibrated offset provided by the factory; offset adjustment is available on this channel.
Note 10: % FS refers to calibrated FS in case of internal calibration, and uncalibrated FS in the case of external calibration.
Uncalibrated FS is set in the factory and specified in this data sheet FS (factory). Calibrated FS is set by the user, allowing
a change in any monitored channel scale.
Note 11: See the Monitor Channels section for more detail or V CC2 and V CC3 selection.
NONVOLATILE MEMORY CHARACTERISTICS
(V CC3 = +2.9V to +5.5V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Endurance (Write Cycle) +70°C 50k Cycles
Endurance (Write Cycle) +25°C 200k Cycles