Datasheet

10 Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Pin Configuration
Pin Description
THIN QFN
(5mm
× 5mm × 0.8mm)
TOP VIEW
26
27
25
24
10
9
11
SCL
FAULT
LOS1
INX
LOS2
12
RSELOUT
DAC1 GND RSSI1N GND V
CC
N.C.
1 2
N.C.
4 5 6 7
2021 19 17 16 15
V
CC
LOSOUT
RSSI2P
N.C.
DNC
RSEL
SDA
DAC2
3
18
28
8
OUTX
GND
N.C.
23
13
RSSI2N
N.C.
22
14
RSSI1P
REFIN
DS1877
*EP
+
*EXPOSED PAD.
PIN NAME FUNCTION
1 RSELOUT Rate-Select Output
2 SCL I
2
C Serial-Clock Input
3 SDA I
2
C Serial-Data Input/Output
4 FAULT
Transmit Fault Input and Output,
Open Drain
5 LOS1 Loss-of-Signal Input 1
6 INX
Digital Input. General-purpose
input, AS1 in SFF-8079, or RS1
in SFF-8431.
7 LOS2 Loss-of-Signal Input 2
8, 18, 21 GND Ground Connection
9 RSEL Rate-Select Input
10 DNC Do Not Connect
11, 15, 23,
24, 25
N.C.
No Connection. Not internally
connected.
PIN NAME FUNCTION
12, 13
RSSI2P,
RSSI2N
Differential External Monitor Input
2 and LOS2 LO Quick Trip
14, 17
RSSI1P,
RSSI1N
Differential External Monitor Input
1 and LOS1 LO Quick Trip
16, 26 V
CC
Power-Supply Input
19 DAC2 DAC2, Delta-Sigma Output
20 DAC1 DAC1, Delta-Sigma Output
22 REFIN
Reference Input for DAC1 and
DAC2
27 LOSOUT Receive Loss-of-Signal Output
28 OUTX
Digital Output. General-purpose
output, AS1 output in SFF-8079,
or RS1 output in SFF-8431.
— EP Exposed Pad (Connect to GND)