MICREL SY88722VKG

Micrel, Inc.
5V/3.3V 622Mbps LASER DIODE
DRIVER WITH OUTPUT ENABLE
FEATURES
■
■
■
■
■
■
SY88722V
SY88722V
DESCRIPTION
Single 3.3V or 5V power supply
Up to 622Mbps operation
Modulation current to 30mA
PECL output enable
Differential PECL inputs
Available in a tiny 10-pin (3mm) MSOP
The SY88722V 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 and no current flows through OUT
when output enable is HIGH.
The device incorporates complementary open collector
outputs with a 30mA maximum current driving capability.
The external 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. Pins 9 and 10 should be connected to achieve better
performance.
The SY88722V utilizes the high performance bipolar
ASSET™ technology.
APPLICATIONS
■ 622Mbps SONET
FUNCTIONAL BLOCK DIAGRAM
VCC
REXT
/OUT
OUT
RSER
DIN
/DIN
to Laser Diode
Internal
IMOD
Logic
/EN
40X
VCC
GND
VEE
VREF
RSET
RSET
ASSET is a trademark of Micrel, Inc.
M9999-072505
[email protected] or (408) 955-1690
Rev.: B
1
Amendment: /0
Issue Date: July 2005
SY88722V
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
/EN 1
10 OUT
DIN 2
9 OUT
/DIN 3
8 /OUT
VREF 4
7 GND
RSET 5
6 VCC
10-Pin MSOP
(K10-1)
Ordering Information
Part Number
Package
Type
Operating
Range
Package
Marking
Lead
Finish
SY88722VKC
K10-1
Commercial
722V
Sn-Pb
SY88722VKCTR(1)
K10-1
Commercial
722V
Sn-Pb
SY88722VKG
K10-1
Industrial
722V with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
SY88722VKGTR(1)
K10-1
Industrial
722V with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
Note:
1. Tape and Reel.
PIN DESCRIPTION
Pin Number
Pin Name
Pin Function
1
/EN
2, 3
DIN, /DIN
4
VREF
Voltage reference for use with RSET.
5
RSET
An external resistor from here to VREF sets the reference current for IOUT.
6
VCC
Positive power supply.
100k PECL compatible input with 75kΩ pulldown resistor. Modulation current goes to zero
when deasserted high.
7
GND
8, 9, 10
/OUT, OUT
Differential 100k PECL compatible input with 75kΩ pulldown resistors.
Device ground.
Differential open collector current outputs.
TRUTH TABLE(Note 1)
D
/D
/EN
OUT (Note 2)
/OUT
L
H
L
H
L
H
L
L
L
H
X
X
H
H
L
Notes:
1. L = LOW, H = HIGH, X = don't care.
2. H = IOUT = 0mA.
M9999-072505
[email protected] or (408) 955-1690
2
SY88722V
Micrel, Inc.
Absolute Maximum Ratings(Note 1)
Operating Ratings(Notes 2, 3, 4)
Power Supply Voltage (VCC) ............................ 0V to +7.0V
Input Voltage (VIN) .............................................. 0V to VCC
Output Current (IOUT) ................................................. 30mA
Power Dissipation (PD) ........................................... 250mW
Lead Temperature (soldering, 20 sec.) ................... +260°C
Storage Temperature Range (TS) ............ –55°C to +125°C
Supply Voltage (VIN) ................................... +3.0V to +3.6V
........................................................ or +4.5V to +5.5V
Ambient Temperature (TA), Note 5 ............ –40°C to +85°C
Junction Temperature (TJ), Note 5 ............ –40°C to 100°C
Resistor to Dissipate Power (REXT) .................. 10Ω to 50Ω
Laser Diode Serial Resistor (RSER) .................... 0Ω to 50Ω
Resistor to Adjust Current (RSET), Note 6 . 700Ω to 20,000Ω
Package Thermal Resistance
MSOP
(θJA) Still-Air ...................................................... 113°C/W
(ψJB) Still-Air ........................................................ 74°C/W
Note 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
RATlNG conditions for extended periods may affect device reliability.
Note 2.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Note 3.
The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device
is tested in a socket such that transverse airflow of ≥500lfpm is maintained.
Note 4.
The voltage drop across REXT and RSER plus Laser Diode must not be greater than 1.4V.
Note 5.
Commercial devices are guaranteed from 0°C to +85°C ambient temperature.
Note 6.
RSET minimum 430Ω.
DC ELECTRICAL CHARACTERISTICS(Note 1)
GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = –40°C to +85°C
Symbol
Parameter
VIH
Input HIGH Voltage
(DIN, /DIN, /EN)
VIL
Max
Units
VCC–1.165
VCC–0.880
V
Input LOW Voltage
(DIN, /DIN, /EN)
VCC–1.810
VCC–1.475
V
VREF
Reference Voltage
1.7
2.3
V
IIL
Input LOW Current
(DIN, /DIN, /EN)
IIH
Input HIGH Current
(DIN, /DIN, /EN)
ICC
Supply Current
IOUT_OFF
Output LOW Current
(/EN = HIGH)
IOUT
Modulation Current
ARSET
IOUT/IRSET
VOUT
Voltage at OUT, /OUT
COUT
Capacitance on OUT, /OUT
Note 1.
Condition
Min
VIN = VIL(min)
2.0
µA
0.5
IMOD = 25mA
450
30
38
VCC–1.4
2.5
Specification for packaged product only.
M9999-072505
[email protected] or (408) 955-1690
Typ
3
100
µA
25
mA
1000
µA
30
mA
44
—
VCC
V
pF
SY88722V
Micrel, Inc.
AC ELECTRICAL CHARACTERISTICS(Note 1, 2)
IMOD =10mA; GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = 0°C to +85°C
Symbol
Parameter
Condition
tPHL,tPLH D
Propagation Delay
DIN – OUT
tPHL,tPLH EN
Propagation Delay
/EN – OUT
tr, tf
Rise/Fall Time
(20% to 80%)
IOR
Output Current Ringing
Min
Max
Units
IOUT = 10mA
1000
ps
IOUT = 10mA
1000
ps
400
ps
10
%
IOUT = 5 to 30mA
Note 1.
Specification for packaged product only.
Note 2.
REXT = RSER = 25Ω ±1%; RSER connected directly to VCC.
TYPICAL OPERATING CHARACTERISTICS
40
IMOD vs. RSET
IMOD (mA)
30
VCC = 5.0V
20
10
0
0
M9999-072505
[email protected] or (408) 955-1690
VCC = 3.3V
1.0
2.0
3.0
RSET (kΩ)
4
4.0
5.0
Typ
SY88722V
Micrel, Inc.
10 LEAD MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
USA
http://www.micrel.com
The information furnished by Micrel in this datasheet 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.
M9999-072505
[email protected] or (408) 955-1690
5