Owner's manual

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.)