Datasheet

DS1878
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCLOUT Clock Frequency f
SCLOUT
833 kHz
SCLOUT Duty Cycle t
3WDC
50 %
SDAOUT Setup Time t
DS
100 ns
SDAOUT Hold Time t
DH
100 ns
CSEL1OUT, CSEL2OUT Pulse-
Width Low
t
CSW
500 ns
CSEL1OUT, CSEL2OUT Leading
Time Before the First SCLOUT
Edge
t
L
500 ns
CSEL1OUT, CSEL2OUT Trailing
Time After the Last SCLOUT
Edge
t
T
500 ns
SDAOUT, SCLOUT Load C
B3W
Total bus capacitance on one line 10 pF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output-Enable Time Following POA t
INIT
(Note 7) 20 ms
Binary Search Time t
SEARCH
(Note 11) 8 10
BIAS
Samples
3-WIRE DIGITAL INTERFACE SPECIFICATION
(V
CC
= +2.85V to +5.5V, T
A
= -40°C to +95°C, timing referenced to V
IL(MAX)
and V
IH(MIN)
, unless otherwise noted.) (Figure 17)
SFP+ Controller with Digital LDD Interface
_______________________________________________________________________________________ 7
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TXD Enable t
OFF
From rising TXD to rising TXDOUT 5 μs
Recovery from TXD Disable t
ON
From falling TXD to falling TXDOUT 5 μs
t
INITR1
From falling TXD 131
Fault Reset Time
(to TXFOUT = 0)
t
INITR2
On power-up or falling TXD, when VCC LO
alarm is detected (Note 7)
161
ms
Fault Assert Time
(to TXFOUT = 1)
t
FAULT
After HTXP, LTXP, HBATH, IBIASMAX
(Note 8)
6.4 55 μs
LOSOUT Assert Time t
LOSS_ON
LLOS (Notes 8, 9) 6.4 55 μs
LOSOUT Deassert Time t
LOSS_OFF
HLOS (Notes 8, 10) 6.4 55 μs
CONTROL LOOP AND QUICK-TRIP TIMING CHARACTERISTICS
(V
CC
= +2.85V to +5.5V, T
A
= -40°C to +95°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.85V to +5.5V, 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 +5.5V, T
A
= -40°C to +95°C, unless otherwise noted.)