DS1874T View Datasheet(PDF) - Maxim Integrated
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DS1874T Datasheet PDF : 88 Pages
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SFP+ Controller with Digital LDD Interface
DIGITAL THERMOMETER CHARACTERISTICS
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Thermometer Error
TERR -40°C to +95°C
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TXD Enable
tOFF From TXD (Notes 5, 6)
Recovery from TXD Disable
(Figure 14)
tON
From TXD (Notes 5, 7)
Recovery After Power-Up
Fault Reset Time (to TXF = 0)
tINIT_DAC
tINITR1
tINITR2
From VCC > VCC LO alarm (Notes 5, 8)
From TXD
From VCC > VCC LO alarm (Note 8)
Fault Assert Time (to TXF = 1)
tFAULT
After HTXP, LTXP, HBATH, IBIASMAX
(Note 9)
LOSOUT Assert Time
LOSOUT Deassert Time
tLOSS_ON LLOS (Notes 9, 10)
tLOSS_OFF HLOS (Notes 9, 11)
MIN TYP MAX UNITS
-3
+3
°C
MIN TYP MAX UNITS
5
μs
1
ms
20
ms
131
ms
161
6.4
55
μs
6.4
55
μs
6.4
55
μs
TIMING CHARACTERISTICS (CONTROL LOOP AND QUICK TRIP)
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output-Enable Time Following POA
tINIT
(Note 8)
20
ms
Binary Search Time
tSEARCH (Note 12)
8
10
BIAS
Samples
3-WIRE DIGITAL INTERFACE SPECIFICATION
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, timing referenced to VIL(MAX) and VIH(MIN), unless otherwise noted. See Figure 15.)
PARAMETER
SCLOUT Clock Frequency
SCLOUT Duty Cycle
SDAOUT Setup Time
SDAOUT Hold Time
CSELOUT Pulse-Width Low
CSELOUT Leading Time Before
the First SCLOUT Edge
SYMBOL
fSCLOUT
t3WDC
tDS
tDH
tCSW
(Note 13)
tL
CONDITIONS
MIN TYP MAX UNITS
833
kHz
50
%
100
ns
100
ns
500
ns
500
ns
CSELOUT Trailing Time After the
Last SCLOUT Edge
tT
(Note 14)
500
ns
SDAOUT, SCLOUT Load
CB3W Total bus capacitance on one line (Note 14)
10
pF
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