2

Agere Systems Inc.

Advance Data Sheet, Rev. 1

October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Flag Output

When the incoming optical signal falls below the link-

status switching threshold, the FLAG output is asserted

and the FLAG output logic level changes from a TTL

low to a TTL high.

Pin Information

Table 1. Pin Information

* Pins designated as no user connect (NUC) are connected inter-

nally. The user should not make any connections to these pins.

† The loss of signal (LOS) FLAG output is a logic level that indicates

the presence or absence of a minimum acceptable level of optical

input. A TTL logic HIGH indicates the absence of a valid optical

input signal.

‡ This pin is not internally connected if the amplitude decision

threshold (DTV) is not made adjustable.

Handling Precautions

The R485-Type receiver is manufactured with a

39 in.

± 4 in. (100 cm ± 10 cm) single-mode fiber pigtail

with a 900

µm OD PVC outer jacket. Both SC and FC-

PC connectors are offered on standard versions. Other

optical connector options are available on special

order. Please contact an Agere Systems Account Man-

ager for availability and ordering information.

The minimum fiber bending radius is 1.5 inches

(38 mm).

Receiver Processing

The R485-Type receiver devices can withstand normal

wave soldering processes. The complete receiver mod-

ule is not hermetically sealed; therefore, it should not

be immersed in, or sprayed with, any solutions. The

optical connector process cap deformation temperature

is 85

°C. The receiver pins can be wave soldered at

250

°C for 10 seconds.

Electrostatic Discharge

CAUTION: This device is susceptible to damage as

a result of electrostatic discharge (ESD).

Take proper precautions during both

handling and testing. Follow guidelines

such as JEDEC Publication No. 108-A

(Dec. 1988).

Although protection circuitry is designed into the

device, take proper precautions to avoid exposure to

ESD.

Agere employs a human-body model HBM) for ESD-

susceptibility testing and protection design evaluation.

ESD voltage thresholds are dependent on the critical

parameters used to define the model. A standard HBM

(resistance = 1.5 k

Ω, capacitance = 100 pF) is widely

used and, therefore, can be used for comparison pur-

poses.

Installation Considerations

Although the receiver has been designed with rugged-

ness in mind, care should be used during handling.

The optical connector should be kept free from dust.

The optical connector process cap should be kept in

place as a dust cover when the device is not connected

to a cable. If contamination is present on the optical

connector, the use of canned air with a extension tube

should remove any loose debris. Other cleaning proce-

dures are outlined in the

Cleaning Fiber Optic Assem-

The cable should be handled conservatively with no

excessive axial pulling or lateral tugging.

Pin

Name

Pin

Name

1

NIC

24

NUC*

2

NUC*

23

NUC*

22

4

Ground

21

NUC*

5CLOCK

20

Ground

6

CLOCK

19

Ground

7

Ground

18

NIC

17

Ground

9

Ground

16

Ground

10

DATA

15

Ground

11

DATA

14

Ground

12

Ground

13