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X9521 Datasheet, PDF (1/26 Pages) Xicor Inc. – Dual DCP, EEPROM Memory
Hot Pluggable
Preliminary Information
X9521
Fiber Channel / Gigabit Ethernet Laser Diode Control for Fiber Optic Modules
Dual DCP, EEPROM Memory
FEATURES
• Two Digitally Controlled Potentiometers (DCP’s)
—100 Tap - 10kΩ
—256 Tap - 100kΩ
— Non-Volatile
—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
• Single Supply Operation
—2.7V to 5.5V
• Hot Pluggable
• Packages
—CSP (Chip Scale Package)
—20 Pin TSSOP
DESCRIPTION
The X9521 combines two Digitally Controlled Potentiome-
ters (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 2 kbit 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 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.
BLOCK DIAGRAM
WP
SDA
SCL
DATA
REGISTER
COMMAND
DECODE &
CONTROL
LOGIC
THRESHOLD
RESET LOGIC
8
PROTECT LOGIC
CONSTAT
REGISTER
4
2 kbit
EEPROM
ARRAY
©2000 Xicor Inc., Patents Pending
REV 1.1.9 1/30/03
www.xicor.com
WIPER
COUNTER
REGISTER
7 - BIT
NONVOLATILE
MEMORY
WIPER
COUNTER
REGISTER
8 - BIT
NONVOLATILE
MEMORY
RH1
RW1
RL1
RH2
RW2
RL2
Characteristics subject to change without notice. 1 of 26