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X9521 Datasheet, PDF (1/25 Pages) Xicor Inc. – Dual DCP, EEPROM Memory
®
Data Sheet
X9521
Dual DCP, EEPROM Memory
August 25, 2005
FN8207.1
Fiber Channel/Gigabit Ethernet Laser
Diode Control for Fiber Optic Modules
FEATURES
• Two Digitally Controlled Potentiometers (DCP’s)
—100 Tap - 10kΩ
—256 Tap - 100kΩ
— Non-Volatile
—Write Protect Function
• 2kbit EEPROM Memory with Write Protect & Block
LockTM
• 2-Wire industry standard Serial Interface
—Complies to the Gigabit Interface Converter
(GBIC) specification
• Single Supply Operation
—2.7V to 5.5V
• Hot Pluggable
• 20 Ld TSSOP
BLOCK DIAGRAM
DESCRIPTION
The X9521 combines two Digitally Controlled Potentiom-
eters (DCP’s), and integrated EEPROM with Block
LockTM protection. All functions of the X9521 are
accessed by an industry standard 2-Wire serial interface.
The DCP’s of the X9521 may be utilized to control the
bias and modulation currents of the laser diode in a Fiber
Optic module. The 2kbit integrated EEPROM may be
used to store module definition data.
The features of the X9521 are ideally suited to simplifying
the design of fiber optic modules which comply to the Gi-
gabit Interface Converter (GBIC) specification. The inte-
gration of these functions into one package significantly
reduces board area, cost and increases reliability of laser
diode modules.
WP
SDA
SCL
DATA
REGISTER
COMMAND
DECODE &
CONTROL
LOGIC
THRESHOLD
RESET LOGIC
8
PROTECT LOGIC
CONSTAT
REGISTER
4
2kbit
EEPROM
ARRAY
WIPER
COUNTER
REGISTER
7 - BIT
NONVOLATILE
MEMORY
WIPER
COUNTER
REGISTER
8 - BIT
NONVOLATILE
MEMORY
RH1
RW1
RL1
RH2
RW2
RL2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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