1
SY88922V
Micrel, Inc.
M9999-091906
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■Up to 2.5Gbps operation
■30mA modulation current
■Separate modulation control
■Separate output enable for laser safety
■Differential inputs for data
■75KΩ input pull-down resistor
■3.3V and 5V power supply options
■Available in a tiny 10-pin (3mm ××
××
×3mm) MSOP
The SY88922V is a high-speed current switch for
driving a semiconductor laser diode in optical transmission
applications. The modulation current (IOUT) is controlled
by the current (IRSET) through the external resistor RSET.
The output OUT is HIGH when output enable is HIGH.
The device incorporates complementary open collector
outputs with a capability of driving peak current of 30mA.
The resistor REXT must be placed between /OUT and
VCC to dissipate the worst case power. RSER is
recommended to compensate for laser diode matching
issues. Pin 9 and pin 10 should be connected to achieve
better performance.
The SY88922V utilizes the high-performance bipolar
ASSET™ technology.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FEATURES
5V/3.3V 2.5Gbps
LASER DIODE DRIVER
BLOCK DIAGRAM
SY88922V
■1.25Gbps and 2.5Gpbs Gigabit Ethernet
■531Mbps, 1062Mbps and 2.12Gbps Fibre Channel
■622Mbps SONET
■Gigabit Interface Converter
■2.5Gbps SDH/SONET
■2.5Gbps Proprietary Links
APPLICATIONS
D
IN
V
CC
R
EXT
/OUT
OUT
R
SER
to Laser Diode
/D
IN
Modulation Control
Internal Logic
BIAS
Control
/EN
I
MOD
V
REF
40X
R
SET
GND
V
CC
GND
R
SET
Rev.: F Amendment: /0
Issue Date: September 2006
ASSET is a trademark of Micrel, Inc.
2
SY88922V
Micrel, Inc.
M9999-091906
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Pin Number Pin Name Pin Function
1/EN Enable. This PECL 100k compatible input enables Laser Driver. Modulation current goes
to zero when asserted HIGH.
2, 3 DIN, /DIN Differential PECL 100k compatible inputs which receive NRZ data.
4VREF Voltage reference for use with RSET.
5RSET An external resistor sets up the source current for modulation IMOD.
6VCC Most positive power supply input.
7GND Ground.
8, 9, 10 /OUT, OUT Open collector outputs from the modulation buffer drive these differential current outputs.
PIN DESCRIPTION
RSET VCC65
1/EN
DIN
/DIN
VREF
10 OUT
OUT
/OUT
GND
9
8
7
2
3
4
10-Pin MSOP (K10-1)
D/D/EN OUT (2) /OUT
LHLHL
HLLLH
XXHHL
Notes:
1. L = LOW, H = HIGH, X = don't care.
2. H = IOUT = 0mA.
TRUTH TABLE(1)
Ordering Information(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY88922VKC K10-1 Commercial SY88922V Sn-Pb
SY88922VKCTR(2) K10-1 Commercial SY88922V Sn-Pb
SY88922VKG K10-1 Industrial SY88922V with Pb-Free
Pb-Free bar-line indicator NiPdAu
SY88922VKGTR(2) K10-1 Industrial SY88922V with Pb-Free
Pb-Free bar-line indicator NiPdAu
Notes:
1. Contact factory for die availability. Die is guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
3
SY88922V
Micrel, Inc.
M9999-091906
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Supply Voltage (VCC)..................................... +0V to +7.0V
Input Voltage (VIN).................................................0 to VCC
Output Current (VOUT)............................................... 30mA
Power Dissipation (PD) ........................................... 250mW
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Maximum Operating Junction Temperature (TJ)..... +125°C
Storage Temperature (TS) ....................... –55°C to +125°C
Operating Ratings(2)
Supply Voltage (VCC).............................. +4.5V to +5.5V or
............................................................ +3.0V to +3.6V
Ambient Temperature (TA) ......................... –40°C to +85°C
Capacitance on OUT + /OUT (COUT)................ 2.5pF (typ.)
Resistor to Dissipate Power (REXT).................... 10 to 50Ω
Laser Diode Serial Resistor (RSER)...................... 0 to 50Ω
Resistor to Adjust Current (RSET)(4) ............... 700 to 20,000Ω
Package Thermal Resistance(3)
MSOP (θJA) Still-air ........................................... 113°C/W
MSOP (ΨJB) ........................................................ 74°C/W
GND = 0V; VCC = +5.0V ±10% or VCC = +3.3V ±10%; TA = –40°C to +85°C; unless noted.
Symbol Parameter Condition Min Typ Max Units
VIH Input HIGH Voltage (DIN, /DIN, /EN) VCC –1165 VCC –880 mV
VIL Input LOW Voltage (DIN, /DIN, /EN) VCC –1810 VCC –1475 mV
VREF Reference Voltage 1.7 2.0 2.3 V
IIL Input LOW Current 0.5 µA
(DIN, /DIN, /EN)(5)
IIH Input HIGH Current (DIN, /DIN, /EN) 100 µA
ICC Supply Current(6) 25 mA
IOL Output LOW Current (/EN = HIGH) 450 1000 µA
IOUT Modulation Current 30 mA
IRSET Modulation Control 0.125 0.625 mA
ARSET =IOUT /IRSET 30 38 44 —
Notes:
1. Permanent device damage may occur if Absolute Maximum Ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to Absolute Maximum Ratings conditions for extended
periods may affect device reliability.
2. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 1V.
3. Still-air without heatsink.
4. RSET minimum 430Ω.
5. VIN = VIL (min).
6. IMOD = 25mA.
DC ELECTRICAL CHARACTERISTICS
4
SY88922V
Micrel, Inc.
M9999-091906
hbwhelp@micrel.com or (408) 955-1690
IMOD =10mA; GND = 0V; VCC = +5V ±10% or VCC = +3.3V ±10%; TA = –40°C to +85°C; unless noted.
Symbol Parameter Condition Min Typ Max Units
tpd D Propagation Delay (DIN – OUT) 400 ps
tpd EN Propagation Delay (/EN – OUT) 400 ps
tr, tfRise/Fall Time(8) 74 130 ps
(20% to 80%)
IOR Output Current Ringing(9) 10 %
DJDeterministic Jitter(10) 7ps
rms
Notes:
7. REXT = RSER = 25Ω ±1%; RSER connects to VCC directly without Laser Diode.
8. IMOD = 10mA.
9. IOH = 5 to 25mA.
10. IMOD = 10mA, 2.5Gbps, 223–1 pattern.
AC ELECTRICAL CHARACTERISTICS(7)
TYPICAL CHARACTERISTICS
0
10
20
30
40
0.0 1.0 2.0 3.0 4.0 5.0
IOUT (µA)
RSET(kΩ)
IOUT vs. RSET
VCC = 3.3V
VCC = 5.0V
5
SY88922V
Micrel, Inc.
M9999-091906
hbwhelp@micrel.com or (408) 955-1690
10-PIN MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
