Rainbow Electronics DS1874 - Manual (Page 7)

DS1874
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCLOUT Clock Frequency f SCLOUT (Note 13) 833 kHz
SCLOUT Duty Cycle t
3WDC
50 %
SDAOUT Setup Time t DS 100 ns
SDAOUT Hold Time t DH 100 ns
CSELOUT Pulse-Width Low t CSW 500 ns
CSELOUT Leading Time Before
the First SCLOUT Edge
t L 500 ns
CSELOUT Trailing Time After the
Last SCLOUT Edge
t T (Note 14) 500 ns
SDAOUT, SCLOUT Load C
B3W
Total bus capacitance on one line (Note 14) 10 pF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output-Enable Time Following POA t INIT (Note 8) 20 ms
Binary Search Time t SEARCH (Note 12) 8 10
BIAS
Samples
3-WIRE DIGITAL INTERFACE SPECIFICATION
(V CC = +2.85V to +3.9V, T A = -40°C to +95°C, timing referenced to V IL(MAX) and V IH(MIN) , unless otherwise noted. See Figure 15.)
SFP+ Controller with Digital LDD Interface
_______________________________________________________________________________________ 7
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TXD Enable t OFF From TXD (Notes 5, 6) 5 μs
Recovery from TXD Disable
(Figure 14)
t
ON
From TXD (Notes 5, 7) 1 ms
Recovery After Power-Up t INIT_DAC From V CC > VCC LO alarm (Notes 5, 8) 20 ms
t INITR1 From TXD 131
Fault Reset Time (to TXF = 0)
t INITR2 From V
CC > VCC LO alarm (Note 8) 161
ms
Fault Assert Time (to TXF = 1) t FAULT
After HTXP, LTXP, HBATH, IBIASMAX
(Note 9)
6.4 55 μs
LOSOUT Assert Time t LOSS_ON LLOS (Notes 9, 10) 6.4 55 μs
LOSOUT Deassert Time t LOSS_OFF HLOS (Notes 9, 11) 6.4 55 μs
TIMING CHARACTERISTICS (CONTROL LOOP AND QUICK TRIP)
(V CC = +2.85V to +3.9V, T A = -40°C to +95°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.85V to +3.9V, T
A
= -40°C to +95°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Thermometer Error T ERR -40°C to +95°C -3 +3 °C
DIGITAL THERMOMETER CHARACTERISTICS
(V CC = +2.85V to +3.9V, T A = -40°C to +95°C, unless otherwise noted.)