DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 24

• 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

SFP+ Controller with Digital LDD Interface
Figure 16. 3-Wire State Machine
24
TXD_LATCHED = 1
______________________________________________________________________________________
SET RTXPOR2_FLAG HERE
SET TXD FLAG HERE
POR
YES
NO
MAN_MODE_RDWR = 1?
WRITE MOD, BIAS = 00
TX_POR = = 1?
READ TXPOR1
UPDATE CTRL
READ TXPOR2
TX_POR = 1?
MODINC = 1?
TXD = = 0?
YES
NO
NO
YES
NO
TXD HIGH_STDBY
TXD = = 0?
YES
1011
BIASINC = = 1?
YES
NO
NO
YES
TXD_FLAG = = 1? OR
APC_BINARY = = 1?
APC_BINARY = = 1?
RESET FLAGS HERE
RTXPOR2 FLAG = 1
BIASINC = = 1?
TX_POR = = 1?
MODULATION
READ TXPOR3
UPDATE BIAS
START APC
YES
YES
STANDBY
UPDATE
NO
LOOP
NO
YES
NO
TXDIS = 1?
NO
STROBE
TEMP_CONV_START = = 1?
MAN_MODE_RDWR = 1?
TXSTAT, BIAS, MOD
OR TXDIS = 1 OR
TXD_FLAG = = 1
RTXPOR2 FLAG
MODINC = = 1?
TX_POR = = 1?
BIASINC = = 1?
AND TXDIS = 0
READ TXPOR4
NO
NO
NO
UPDATE
NO
NO
YES
MODULATION
READ/WRITE
INCREMENT
MANMODE
YES
YES
YES