DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 66

• 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 B8h: LOS RANGING
SFP+ Controller with Digital LDD Interface
66
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B8h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
This register controls the full-scale range of the quick-trip monitoring for the differential input’s of MON3.
RESERVED
BITS 6:4
BITS 2:0
BIT 7
BIT 7
BIT 3
RESERVED (Default = 0)
HLOS[2:0]: HLOS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for high LOS
found on MON3. Default is 000b and creates an FS of 1.25V.
RESERVED (Default = 0)
LLOS[2:0]: LLOS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for low LOS
found on MON3. Default is 000b and creates an FS of 1.25V.
HLOS
HLOS[2:0]
LLOS[2:0]
2
000b
001b
010b
011b
100b
101b
110b
111b
000b
001b
010b
011b
100b
101b
110b
111b
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (SEE)
HLOS
1
% of 1.25V
% of 1.25V
HLOS
100.00
100.00
80.02
66.69
50.10
40.05
33.38
26.62
25.04
80.02
66.69
50.10
40.05
33.38
26.62
25.04
0
RESERVED
FS Voltage
FS Voltage
1.0003
0.8336
0.6263
0.5006
0.4173
0.3328
0.3130
1.0003
0.8336
0.6263
0.5006
0.4173
0.3328
0.3130
1.250
1.250
LLOS
2
LLOS
2
1
LLOS
BIT 0
0