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The MAX366 and MAX367 are multiple, two-terminal circuit protectors. Placed in series with signal lines, each two-terminal device guards sensitive circuit components against voltages near and beyond the normal supply voltages. These devices are used at interfaces where sensitive circuits are connected to the external world and could encounter damaging voltages (up to 35V beyond the supply rails) during power-up, power-down, or fault conditions.
The MAX366 contains three independent protectors and the MAX367 contains eight. They can protect analog signals using either unipolar (4.5V to 36V) or bipolar (±2.25V to ±18V) power supplies. Each protector is symmetrical. Input and output terminals may be freely interchanged. These devices are voltage-sensitive MOSFET transistor arrays that are normally on when power is applied and normally open circuit when power is off. With ±10V supplies, on-resistance is 100½ max and leakage is less than 1nA at +25°C.
When signal voltages exceed or are within approximately 1.5V of either power-supply voltage (including when power is off), the two-terminal resistance increases dram atically, limiting fault current as well as output voltage to sensitive circuits. The protected side of the switch maintains the correct polarity and clamps approximately 1.5V below the supply rail. There are no "glitches" or polarity reversals going into or coming out of a fault condition.
MAX366 Maximum Ratings
V+ to V-..................................................................... -0.3V, +44V IN_, OUT_ ..................................................(V- + 44V), (V+ - 44V) Continuous Current into Any Terminal.................................±30mA Peak Current into Any Terminal (pulsed at 1ms, 10% duty cycle)...................................±70mA Continuous Power Dissipation (TA = +70) 8-Pin Plastic DIP (derate 9.09mW/ above +70) .......727mW 8-Pin SO (derate 5.88mW/ above +70)...................471mW 8-Pin CERDIP (derate 8.00mW/ above +70)............640mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70) .889mW 18-Pin Wide SO (derate 9.52mW/ above +70) .......762mW 18-Pin CERDIP (derate 10.53mW/ above +70)........842mW Operating Temperature Ranges MAX36_C_ _ .......................................................0 to +70 MAX36_E_ _.....................................................-40 to +85 MAX36_M_ _..................................................-55 to +125 Storage Temperature Range ...............................-65 to +150 Lead Temperature (soldering, 10sec) ................................+300
MAX366 Features
` ±40V Overvoltage Protection ` Open Signal Paths with Power Off 100 Signal Paths with Power On ` 1nA Max Path Leakage at +25°C ` 44V Maximum Supply Voltage Rating ` Automatic Protection; No Programming or Controls
MAX366 Typical Application
·Process Control Systems Redundant/Backup Systems ·Hot-Insertion Boards/Systems ATE Equipment ·Data-Acquisition Systems Sensitive Instruments
MAX366 Connection Diagram
MAX3664 General Description
The MAX3664 low-power transimpedance preamplifier for 622Mbps SDH/SONET applications consumes only 85mW. Operating from a single +3.3V supply, it converts a small photodiode current to a measurable differential voltage. A DC cancellation circuit provides a true differential output swing over a wide range of input current levels, thus reducing pulse-width distortion. The differential outputs are back-terminated with 60 per side.
The transimpedance gain is nominally 6k. For input signal levels beyond approximately 100µAp-p, the amplifier will limit the output swing to 900mV. The MAX3664's low 55nA input noise provides a typical sensitivity of -33.2dBm in 1300nm, 622Mbps receivers.
The MAX3664 is designed to be used in conjunction with the MAX3675 clock recovery and data retiming IC with limiting amplifier. Together, they form a complete 3.3V, 622Mbps SDH/SONET receiver.
In die form, the MAX3664 is designed to fit on a header with a PIN diode. It includes a filter connection, which provides positive bias for the photodiode through a 1k resistor to VCC. The device is also available in 8-pin SO and µMAX packages.
MAX3664 Maximum Ratings
VCC................................................................-0.5V to +5.5V Continuous Current IN, INREF1, INREF2, COMP, FILT....................................5mA OUT+, OUT-.................................................................25mA Continuous Power Dissipation (TA = +85°C) SO (derate 5.88mW/°C above +85°C)..................383mW µMAX (derate 4.1mW/°C above +85°C) ...............268mW Operating Junction Temperature (die) ..-40°C to +150°C Processing Temperature (die) ..............................+400°C Storage Temperature Range ................-65°C to +160°C Lead Temperature (soldering, 10sec) ..................+300°C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
MAX3664 Features
`Single +3.3V Supply Operation `55nARMS Input-Referred Noise `6k Gain `85mW Power `300µA Peak Input Current `200ps Max Pulse-Width Distortion `Differential Output Drives 100 Load `590MHz Bandwidth
MAX3664 Typical Application
·SDH/SONET Receivers ·PIN/Preamplifier Receivers ·Regenerators for SDH/SONET