DS1877 datasheet(10/65 Pages) MAXIM

Part #	DS1877

Description	SFP Controller for Dual Rx Interface

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Manufacturer	MAXIM [Maxim Integrated Products]

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SFP Controller for Dual Rx Interface

10

Pin Configuration

Pin Description

THIN QFN

(5mm × 5mm × 0.8mm)

TOP VIEW

26

27

25

24

10

9

11

12

1

2

N.C.

4

5

6

7

20

21

19

17

16 15

VCC

LOSOUT

RSSI2P

N.C.

DNC

RSEL

3

18

28

8

OUTX

GND

N.C.

23

13 RSSI2N

N.C.

22

14 RSSI1P

REFIN

DS1877

*EP

+

*EXPOSED PAD.

NAME

FUNCTION

1

RSELOUT

Rate-Select Output

2

SCL

I2C Serial-Clock Input

3

SDA

I2C 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.

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

VCC

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)

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