DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 75

• 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

Table 02h, Register C7h: TBLSELPON
Table 02h, Register C8h–C9h: MAN BIAS
Table 02h, Register CAh: MAN_CNTL
CAh
C7h
C8h
C9h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Chooses the initial value for the table-select byte (Lower Memory, Register 7Fh) at power-on.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
When BIAS EN (Table 02h, Register 80h) is written to 0, writes to these bytes control the BIAS register, which then
updates the MAX3798/MAX3799 SET_IBIAS register.
When BIAS EN (Table 02h, Register 80h) is written to 0, MAN_CLK controls the updates of the MAN BIAS value to
the BIAS register. This new value is sent through the 3-wire interface. The values of MAN BIAS must be written with
a separate write command. Setting MAN_CLK to a 1 clocks the MAN BIAS value to the BIAS register, which then
updates the MAX3798/MAX3799 SET_IBIAS register.
1) Write the MAN BIAS value with a write command.
2) Set the MAN_CLK bit to a 1 with a separate write command.
3) Clear the MAN_CLK bit to a 0 with a separate write command.
RESERVED
SFP+ Controller with Digital LDD Interface
BIT 7
BIT 7
BIT 7
2
2
0
7
7
______________________________________________________________________________________
RESERVED
2
2
0
6
6
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
Volatile
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
0000h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and BIAS EN = 0) or (PW1 and RWTBL246 and BIAS EN = 0)
Volatile
RESERVED
2
2
0
5
5
RESERVED
2
2
0
4
4
RESERVED
2
2
0
3
3
RESERVED
2
2
0
2
2
RESERVED
2
2
0
1
1
MAN_CLK
BIT 0
BIT 0
BIT 0
2
2
2
8
0
0
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