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ML4632, ML4632CS/CS-5, ML4642

Table of contents:
Info of ML4632
Info of ML4632CS/CS-5
Info of ML4642

ML4632, ML4632CS/CS-5, ML4642 Selling Leads, Datasheet

MFG:ML Package Cooled:SOP D/C:04+05+

ML4632, ML4632CS/CS-5, ML4642 Datasheet download

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Part Number: ML4632

MFG: ML

Package Cooled: SOP

D/C: 04+05+

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ML4632 General Description

The ML4632 is a fiber optic LED driver suited for networkapplications up to 20Mbps. The part is capable of drivingup to 100mA of current through a Fiber Optic LED froman ECL or TTL level input signal. Its efficient output stageprovides a high current that can be programmed foraccurate absolute output level as well as automatictemperature compensation. The combination of automatictemperature compensation and a highly accurate currentdriven design insures precise launch power.

The LED driver's output stage provides fast, well matchedrise and fall times through a unique class B output stagethat burns supply current only when the LED is on. Apositive temperature coefficient of up to 3300ppm/°C canbe programmed into the output current to compensate forthe negative temperature coefficient of the LED opticaloutput power. An optional peaking circuit may also beemployed.

The ECL and TTL inputs are ANDed so one can be usedfor data and the other for an enable input. An ECLcompatible BIAS voltage is also provided for single endedECL applications.

ML4632 Maximum Ratings

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
VCC ............................................................................... 0.3V to 6V
Input Pin Voltages ............................. 0.3V to VCC +0.3V
LED Output Current ............................................. 120mA
PEAK DC Output Current ..................................... 120mA
Storage Temperature.............................. 65°C to +150°C
Lead Temperature (Soldering 10 sec.) ..................... 260°C

ML4632 Features

·Current Driven Output for accurate Launch Power
·Programmable output current from 20mA to 100mA
·Programmable temperature coefficient, 0 to 3300ppm/°C
·High Efficiency Output Stage
·Programmable LED pre-bias current
·Low EMI/RFI Noise
·ECL or TTL inputs
·Optional Peaking circuit

ML4632 Typical Application

`IEEE 802.3, 10BASE-F
`IEEE 802.5 Fiber Optic Token Ring
`IEEE 802.4 Fiber Optic Token Bus
`Fiber Optic Data Communications and Telecommunications

ML4632 Connection Diagram

ML4642 General Description

The ML4642 AUI Multiplexer contains all the necessarydrivers/receivers and control logic to implement a 2 portMAU when used in conjuction with a transceiver chipwhich has a standard 802.3 AUI interface. In addition, theML4642 is capable of operating in stand-alone modewhere it interconnects two DTEs in the absence of anetwork MAU. Several ML4642s can be cascadedtogether to implement a 4 or 8 port MAU or stand-alonedevice.

Logic within the ML4642 detects collisions resulting frommultiple DTEs transmitting simultaneously. In addition,collision signals received from a transceiver attached atthe MAU port are propagated to both of the DTE ports.Jabbering DTEs are prevented from loading down thenetwork by internal jabber timers which disable babblingports.

ML4642 Maximum Ratings

Absolute maximum ratings are limits beyond which thelife of the integrated circuit may be impaired. All oltages unless otherwise specified are measured withrespect to ground.
Power Supply Voltage Range VCC . . . GND 0.3V to 6.0V
Input Current RRSET, JAB1/JABD, JAB2, CDLED,
RxLED/LPBK/SQE, TxLED1, TxLED2 . . . . . . . . . . 60mA
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150°C
Storage Temperature . . . . . . . . . . . . . . . . 65°C to 150°C
Lead Temperature (Soldering 10 seconds) . . . . . . . 260°C
Thermal Resistance (qJA)
SSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109°C/W
PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68°C/W
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . 5V ± 10%
LED on Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
RRSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.9ký ± 1%

ML4642 Features

·IEEE 802.3 compliant AUI interfaces assure ompatibility with any AUI ready devices
·No crystal or clock input
·On-chip Jabber logic, Collision Detection, and SQE est with enable/disable option
·Selectable Loopback, Jabber, and SQE Test allows ascading of multiple chips to increase DTE port

ML4642 Connection Diagram

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