LT1237 Linear Technology, LT1237 Datasheet
LT1237
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LT1237 Summary of contents
Page 1
... L = 1000pF L The LT1237 is fully compliant with all EIA RS232 specifi- cations. New ESD structures on the chip allow the LT1237 to survive multiple 15kV strikes, eliminating the need for costly TransZorbs The LT1237 operates in excess of 120kbaud even driving heavy capacitive loads. Two shutdown modes allow the driver outputs to be shut down separately from the receiv- ers for more versatile control of the RS232 interface ...
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... V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LT1237C ................................................. Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL C HARA TERISTICS C temperature range, otherwise specifications are at T PARAMETER CONDITIONS Power Supply Generator ...
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... Note 6: For receiver delay measurements, C set between the receiver’s input logic threshold and the output transition to standard TTL/CMOS logic threshold (t to 0.8V). Note 7: Data rate operation guaranteed by slew rate, short-circuit current 0.1V. ON/OFF and propagation delay tests. LT1237 MIN TYP MAX UNITS 5.0 7.5 V – ...
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... LT1237 W U TYPICAL PERFOR A Driver Output Voltage OUTPUT HIGH 4. –2 –4 OUTPUT LOW V = 4.5V CC – –8 –10 – 100 125 –25 TEMPERATURE (°C) 1237 G01 Supply Current in Shutdown 150 125 100 75 50 ...
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... V : Negative Supply Output (RS232 Drivers). V –(2V – 2.5V). This pin requires an external charge CC storage capacitor C 0.1 F. See the Applications Infor- mation section for guidance in choosing filter capacitors + for V and V LT1237 Receiver Short-Circuit Current RX1 TO RX4 – RX1 TO RX4 + I SC – ...
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... IEC 1000-4-2 air gap discharges. U ESD PROTECTIO The RS232 line inputs of the LT1237 have on-chip protec- tion from ESD transients up to 15kV for human body discharges, 8kV for IEC 1000-4-2 contact mode dis- charges and 15V for IEC 1000-4-2 air gap discharges. ...
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... The V and V storage capacitors must be chosen care- fully to insure low ripple and stable operation. The LT1237 charge pump operates in a power efficient Burst Mode operation. When storage capacitor voltage drops below a preset threshold, the oscillator is gated on until V are boosted up to levels exceeding a second threshold. ...
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... NOTE – LT1237 0 DRIVER LOGIC “0” RX1 OUT 5 24 DRIVER LOGIC “0” RX2 OUT 7 22 RX3 OUT 8 21 ...