DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 47

• 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

Lower Memory, Register 7Bh–7Eh: Password Entry (PWE)
Lower Memory, Register 7Fh: Table Select (TBL SEL)
7Bh
7Ch
7Dh
7Eh
7Fh
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The upper memory tables of the DS1874 are accessible by writing the desired table value in this register. The power-on
value of this register is defined by the value written to TBLSELPON (Table 02h, Register C7h).
POWER-ON VALUE
READ ACCESS
WRITE ACCESS
MEMORY TYPE
There are two passwords for the DS1874. Each password is 4 bytes long. The lower level password (PW1) has all the
access of a normal user plus those made available with PW1. The higher level password (PW2) has all the access of
PW1 plus those made available with PW2. The values of the passwords reside in EEPROM inside PW2 memory. At
power-up, all PWE bits are set to 1. All reads at this location are 0.
BIT 7
BIT 7
2
2
2
2
2
31
23
15
SFP+ Controller with Digital LDD Interface
7
7
______________________________________________________________________________________
2
2
2
2
2
30
22
14
6
6
TBLSELPON (Table 02h, Register C7h)
All
All
Volatile
FFFF FFFFh
N/A
All
Volatile
2
2
2
2
2
29
21
13
5
5
2
2
2
2
2
28
20
12
4
4
2
2
2
2
2
27
19
11
3
3
2
2
2
2
2
26
18
10
2
2
2
2
2
2
2
25
17
1
9
1
BIT 0
BIT 0
2
2
2
2
2
24
16
8
0
0
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