DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 8

• Manufacturer Part Number: DS1874T+
• Description: IC CTLR SFP+ ANLG LDD 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Controllerr

Specifications of DS1874T+

• Number Of Channels: 1
• Voltage - Supply: 2.85 V ~ 3.9 V
• Current - Supply: 2.5mA
• Operating Temperature: -40°C ~ 95°C
• Package / Case: 28-WFQFN Exposed Pad
• Mounting Type: Surface Mount
• Number Of Outputs: 5
• Duty Cycle (max): 50 %
• Output Voltage: 0 V to 3.9 V
• Mounting Style: SMD/SMT
• Switching Frequency: 0 KHz to 400 KHz
• Operating Supply Voltage: 2.85 V to 3.9 V
• Supply Current: 2.5 mA to 10 mA
• Maximum Operating Temperature: + 95 C
• Fall Time: 300 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 300 ns
• Synchronous Pin: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 90-1874T+000

I
(V
SFP+ Controller with Digital LDD Interface
NONVOLATILE MEMORY CHARACTERISTICS
(V
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: This specification is the time it takes from MON3 voltage falling below the LLOS trip threshold to LOSOUT asserted high.
Note 11: This specification is the time it takes from MON3 voltage rising above the HLOS trip threshold to LOSOUT asserted low.
Note 12: Assuming an appropriate initial step is programmed that would cause the power to exceed the APC set point within four
Note 13: I
Note 14: C
Note 15: EEPROM write begins after a STOP condition occurs.
8
2
SCL Clock Frequency
Clock Pulse-Width Low
Clock Pulse-Width High
Bus-Free Time Between STOP and START
Condition
START Hold Time
START Setup Time
Data Out Hold Time
Data In Setup Time
Rise Time of Both SDA and SCL Signals
Fall Time of Both SDA and SCL Signals
STOP Setup Time
EEPROM Write Time
Capacitive Load for Each Bus Line
EEPROM Write Cycles
CC
CC
C AC ELECTRICAL CHARACTERISTICS
_______________________________________________________________________________________
= +2.85V to +3.9V, T
= +2.85V to +3.9V, unless otherwise noted.)
PARAMETER
All voltages are referenced to ground. Current into the IC is positive, and current out of the IC is negative.
Inputs are at supply rail. Outputs are not loaded.
This parameter is guaranteed by design.
Full-scale is user programmable.
The DACs are the bias and modulation DACs found in the MAX3798/MAX3799 that are controlled by the DS1874.
The DS1874 is configured with TXDOUT connected to the MAX3798/MAX3799 DISABLE input.
This includes writing to the modulation DAC and the initial step written to the bias DAC.
A temperature conversion is completed and the modulation register value is recalled from the LUT and V
measured to be above V
The timing is determined by the choice of the update rate setting (see Table 02h, Register 88h).
steps, the bias current will be within 3% within the time specified by the binary search time. See the BIAS and MODULA-
TION Control During Power-Up section.
timing.
2
C interface timing shown is for fast mode (400kHz). This device is also backward compatible with I
B
—the total capacitance of one bus line in pF.
PARAMETER
A
= -40°C to +95°C, timing referenced to V
CC
SYMBOL
LO alarm.
SYMBOL
t
t
t
t
t
HD:STA
HD:DAT
SU:DAT
SU:STO
SU:STA
t
t
f
HIGH
t
LOW
SCL
BUF
C
At +25°C
At +85°C
t
t
t
W
R
F
B
(Note 13)
(Note 14)
(Note 14)
(Note 15)
CONDITIONS
CONDITIONS
IL(MAX)
and V
IH(MIN)
, unless otherwise noted. See Figure 17.)
20 + 0.1C
20 + 0.1C
200,000
MIN
100
50,000
1.3
0.6
1.3
0.6
0.6
0.6
MIN
0
0
B
B
TYP
TYP
2
C standard mode
CC
MAX
MAX
400
300
300
400
0.9
20
has been
UNITS
UNITS
kHz
ms
pF
μs
μs
μs
μs
μs
μs
ns
ns
ns
μs