SY88802KI - Micrel Semiconductor, Inc.

SY88802

Micrel

DESCRIPTION

■Up to 155Mbps operation

■ Modulation current to 25mA

■PECL output enable

■Differential PECL inputs

■Single 5V power supply

■Available in a tiny 10-pin (3mm) MSOP

FEATURES

5V 155Mbps LASER DIODE

DRIVER WITH OUTPUT ENABLE SY88802

APPLICATIONS

■155Mbps SONET

Rev.: A Amendment: /0

Issue Date: March 2003

The SY88802 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 25mA 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.

The SY88802 utilizes the high performance bipolar

ASSET™ technology.

ASSET is a trademark of Micrel, Inc.

FUNCTIONAL BLOCK DIAGRAM

EXT

/EN

/DIN

DIN

Internal

Logic

SET

REF

40X

SER

MOD

/OUT

GND

to Laser Diode

OUT

SY88802

Micrel

PACKAGE/ORDERING INFORMATION

Ordering Information

Package Operating Package

Part Number Type Range Marking

SY88802KC K10-1 Commercial 802

SY88802KCTR* K10-1 Commercial 802

SY88802KI K10-1 Industrial 802

SY88802KITR* K10-1 Industrial 802

*Tape and Reel

Pin Number Pin Name Pin Function

1 /EN 100k PECL compatible input w/ 75kΩ pulldown resistor. Modulation current goes to zero

when deasserted high.

2, 3 DIN, /DIN Differential 100k PECL compatible input w/ 75kΩ pulldown resistors.

4 VREF Voltage reference for use with RSET.

5 RSET An external resistor connected from here to VREF sets the reference current for IOUT.

6, 7 GND Device ground.

9, 8 OUT, /OUT Differential open collector current outputs.

10 VCC Positive power supply.

PIN DESCRIPTION

RSET GND65

1/EN

DIN

/DIN

VREF

10 VCC

OUT

/OUT

GND

10-Pin MSOP

(K10-1)

D /D /EN OUT(Note 2) /OUT

LHLHL

HLLLH

XXHHL

Note 1. L = LOW, H = HIGH, X = don't care.

Note 2. H = IOUT = 0mA.

TRUTH TABLE(Note 1)

SY88802

Micrel

Absolute Maximum Ratings(Note 1)

Power Supply Voltage (VCC)............................ 0V to +7.0V

Input Voltage (VIN) .............................................. 0V to VCC

Output Current (IOUT).................................................25mA

Power Dissipation (PTOT)........................................250mW

Storage Temperature Range (TS)............–55°C to +125°C

Operating Ratings(Notes 2, 3, 4)

Supply Voltage (VCC) .................................. +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) ..........1500Ω to 50,000Ω

Package Thermal Resistance

MSOP

(θJA) Still-Air ......................................................113°C/W

(ψJB) Still-Air........................................................74°C/W

GND = 0V; VCC = 5V ±10%; TA = –40°C to +85°C

Symbol Parameter Condition Min Typ Max Units

VIH Input HIGH Voltage VCC–1.165 VCC–0.880 V

(DIN, /DIN, /EN)

VIL Input LOW Voltage VCC–1.810 VCC–1.475 V

(DIN, /DIN, /EN)

VREF Reference Voltage 3.00 V

IIL Input LOW Current VIN = VIL(min) 0.5 µA

(DIN, /DIN, /EN)

IIH Input HIGH Current 100 µA

(DIN, /DIN, /EN)

ICC Supply Current IMOD = 25mA 16 25 mA

IOUT_OFF Output LOW Current 500 µA

(/EN = HIGH)

IOUT Modulation Current 5 15 25 mA

ARSET IOUT/IRSET 30 38 44 —

VOUT Voltage at OUT, /OUT VCC–2.3 VCC V

COUT Capacitance on OUT, /OUT 2.5 pF

Note 1. Specification for packaged product only.

DC ELECTRICAL CHARACTERISTICS(Note 1)

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 2.3V.

Note 5. Commercial devices are guaranteed from 0°C to +85°C ambient temperature.

SY88802

Micrel

GND = 0V; VCC = 5V ±10%; TA = –40°C to +85°C

Symbol Parameter Condition Min Typ Max Units

tPHL, tPLH D Propagation Delay IOUT = 10mA 1000 ps

DIN – OUT

tPHL, tPLH EN Propagation Delay IOUT = 10mA 1000 ps

/EN – OUT

tr, tfRise/Fall Time 1000 ps

(20% to 80%)

IOR Output Current Ringing IOUT = 5 to 25mA 10 %

Note 1. Specification for packaged product only.

Note 2. REXT = RSER = 50Ω ±1%; RSER connected directly to VCC.

AC ELECTRICAL CHARACTERISTICS(Note 1, 2)

TYPICAL OPERATING CHARACTERISTICS

MOD

(mA)

0.00.0

4.0K 6.0K 8.0K 10K

2.0K

SET

(

)

12K

IMOD vs. RSET

SY88802

Micrel

10 LEAD MSOP (K10-1)

Rev. 00

MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB 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.