Hot Pluggable
Preliminary Information
X9520
Fiber Channel / Gigabit Ethernet Laser Diode Control for Fiber Optic Modules
Triple DCP, POR, 2 kbit EEPROM Memory, Dual Voltage Monitors
FEATURES
DESCRIPTION
• Three Digitally Controlled Potentiometers (DCPs)
—64 Tap - 10 kΩ
The X9520 combines three Digitally Controlled Potentiome-
ters (DCPs), V1 / Vcc Power On Reset (POR) circuitry, two
programmable voltage monitor inputs with software and
hardware indicators, and integrated EEPROM with Block
LockTM protection. All functions of the X9520 are accessed
by an industry standard 2-Wire serial interface.
—100 Tap - 10 kΩ
—256 Tap - 100 kΩ
—Nonvolatile
—Write Protect Function
• 2 kbit EEPROM Memory with Write Protect & Block
LockTM
• 2-Wire industry standard Serial Interface
—Complies to the Gigabit Interface Converter (GBIC)
specification
• Power On Reset (POR) Circuitry
—Programmable Threshold Voltage
—Software Selectable reset timeout
—Manual Reset
• Two Supplementary Voltage Monitors
—Programmable Threshold Voltages
• Single Supply Operation
—2.7 V to 5.5 V
Two of the DCPs of the X9520 may be utilized to control the
bias and modulation currents of the laser diode in a Fiber
Optic module. The third DCP may be used to set other vari-
ous reference quantities, or as a coarse trim for one of the
other two DCPs. The 2 kbit integrated EEPROM may be
used to store module definition data. The programmable
POR circuit may be used to ensure that V1 / Vcc is stable
before power is applied to the laser diode / module. The
programmable voltage monitors may be used for monitoring
various module alarm levels.
The features of the X9520 are ideally suited to simplifying
the design of fiber optic modules which comply to the Giga-
bit Interface Converter (GBIC) specification. The integration
of these functions into one package significantly reduces
board area, cost and increases reliability of laser diode
modules.
• Hot Pluggable
• 20 Pin packages
—XBGATM
—TSSOP
BLOCK DIAGRAM
R
R
R
H0
W0
L0
WIPER
COUNTER
REGISTER
8
6 - BIT
NONVOLATILE
MEMORY
WP
PROTECT LOGIC
R
R
R
H1
W1
L1
WIPER
COUNTER
REGISTER
CONSTAT
REGISTER
DATA
REGISTER
4
SDA
SCL
7 - BIT
NONVOLATILE
MEMORY
COMMAND
DECODE &
CONTROL
LOGIC
2 kbit
EEPROM
ARRAY
R
R
R
H2
W2
L2
WIPER
COUNTER
REGISTER
THRESHOLD
RESET LOGIC
MR
V3
2
8 - BIT
NONVOLATILE
MEMORY
V3RO
V2RO
V1RO
-
+
VTRIP3
VTRIP2
VTRIP1
V2
-
+
POWER ON /
LOW VOLTAGE
RESET
V1 / Vcc
+
-
GENERATION
©2000 Xicor Inc., Patents Pending
REV 1.1.9 9/14/01
Characteristics subject to change without notice. 1 of 34
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