JSH-42L3AD3-20 JDS UNIPHASE, JSH-42L3AD3-20 Datasheet - Page 8

• Manufacturer Part Number: JSH-42L3AD3-20
• Manufacturer: JDS UNIPHASE

Specifications of JSH-42L3AD3-20

• Number Of Receivers: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Operating Temperature (max): 85C
• Lead Free Status / Rohs Status: Compliant

JSH-42L3AD3-20S / 64P0682
LW 4x/2x/1x FC SFP with DDM
MOD_DEF(0:2)
A two-wire serial interface is used to access two 256-byte memory spaces that describe some of the capabil-
ities, standard interfaces, manufacturer, optical monitor levels, alarms and other information relevant to the
product. Some of this space is protected and some is user writable. Also some of the space is non-volatile so
that information is retained during unpowered conditions. Tables describing the specific addresses and val-
ues of the memory space are included in Two-Wire Interface Timing Specifications on page 23 and on page
31. Operation of the two-wire interface is described in Two-Wire Protocol for Serial ID and Digital Diagnostic
Monitoring Information on page 11. Signal timings necessary for proper operation of the Serial ID function are
shown in Two-Wire Interface Timing Specifications on page 23.
The two-wire interface requires both a serial clock (SCL) and serial data I/O (SDA) connections. These sig-
nals are required to have pull up resistors on the host board to the 3.3V supplying the transceiver (4.7 kΩ is
the recommended value; however, a smaller value may be needed in order to meet the Serial ID’s rise and
fall time requirements). The following list and figure show the necessary connections from an interface to a
SFF to ensure the capability of reading the Serial ID data.
The serial clock (SCL) and the serial data (SDA) lines appear as NC to the host system upon initial power up.
Expected Connections to SFF MOD_DEF Pins
JDSU Product Specification 21121822-001
Page 8 of 45
MOD_DEF(0): Logic Low
MOD_DEF(1): SCL
MOD_DEF(2): SDA
Interface
SCL
SDA
Host
MOD_DEF(0)
MOD_DEF(1)
MOD_DEF(2)
SFF
October 2008