![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/DS1876T-T-R_datasheet_96975/DS1876T-T-R_10.png)
10
Maxim Integrated
SFP Controller with Dual LDD Interface
DS1876
Pin Configuration
Pin Description
THIN QFN
(5mm × 5mm × 0.8mm)
TOP VIEW
26
27
25
24
10
9
11
SCL
TXFOUT
TXF1
IN1
TXD1
12
RSELOUT
MOD1
GND
TXDOUT2
GND
V CC
N.C.
1
2
APC1
4
5
6
7
20
21
19
17
16 15
VCC
TXF2
BMON2
PMON2
TXDOUT1
RSEL
SDA
MOD2
3
18
28
8
OUT1
GND
APC2
23
13 PMON1
TXD2
22
14 BMON1
REFIN
DS1876
*EP
+
*EXPOSED PAD.
PIN
NAME
FUNCTION
1
RSELOUT
Rate-Select Output
2
SCL
I2C Serial-Clock Input
3
SDA
I2C Serial-Data Input/Output
4
TXFOUT
Transmit Fault Output, Open
Drain
5
TXF1
Transmit Fault Input 1
6
IN1
Digital Input. General-purpose
input, AS1 in SFF-8079, or RS1
in SFF-8431.
7
TXD1
Transmit Disable Input 1
8, 18, 21
GND
Ground Connection
9
RSEL
Rate-Select Input
10
TXDOUT1
Transmit Disable Output 1
11
PMON2
External Monitor Input PMON2
and HTXP2/LTXP2 Quick Trip
12
BMON2
External Monitor Input BMON2
and HBATH2 Quick Trip
13
PMON1
External Monitor Input PMON1
and HTXP1/LTXP1 Quick Trip
PIN
NAME
FUNCTION
14
BMON1
External Monitor Input BMON1
and HBATH1 Quick Trip
15
N.C.
No Connection
16, 26
VCC
Power-Supply Input
17
TXDOUT2
Transmit Disable Output 2
19
MOD2
MOD2 DAC, Delta-Sigma Output
20
MOD1
MOD1 DAC, Delta-Sigma Output
22
REFIN
Reference Input for DAC1 and
DAC2
23
TXD2
Transmit Disable Input 2
24
APC2
APC2 DAC, Delta-Sigma Output
25
APC1
APC1 DAC, Delta-Sigma Output
27
TXF2
Transmit Fault Input 2
28
OUT1
Digital Output. General-purpose
output, AS1 output in SFF-8079,
or RS1 output in SFF-8431.
—
EP
Exposed Pad (Connect to GND)