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LTC1472CS Datasheet(PDF) 7 Page - Linear Technology |
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LTC1472CS Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LTC1472 1472fa BLOCK DIAGRAM TTL-TO-CMOS CONVERTER OSCILLATOR AND BIAS GATE CHARGE AND DISCHARGE CONTROL LOGIC CHARGE PUMP GATE CHARGE AND DISCHARGE CONTROL LOGIC CURRENT LIMIT AND THERMAL SHUTDOWN 5VIN 0.14 Ω 0.12 Ω VCC(OUT) 3VIN BREAK-BEFORE- MAKE SWITCH AND CONTROL TTL-TO-CMOS CONVERTER VCC EN0 VCC EN1 LTC1470-BD01 VPPIN VPPIN VCC(IN) VPPOUT 100 Ω 1.7 Ω 0.5 Ω 10V VPP EN1 VPP EN0 SHDN VDD GATE CHARGE AND DISCHARGE CONTROL LOGIC OSCILLATOR AND BIAS CURRENT LIMIT AND THERMAL SHUTDOWN CHARGE PUMP GATE CHARGE AND DISCHARGE CONTROL LOGIC CHARGE PUMP BREAK-BEFORE- MAKE SWITCH TTL-TO-CMOS CONVERTER TTL-TO-CMOS CONVERTER – + OPERATION The LTC1472 protected switch matrix is designed to be a complete single slot solution for VCC and VPP switching in a PCMCIA compatible card system. The LTC1472 consists of two independent functional sections: the VCC switching section, and the VPP switching section. THE VCC SWITCHING SECTION The VCC switching section of the LTC1472 consist of the following functional blocks: VCC Switch Input TTL-CMOS Converters The LTC1472 VCC inputs are designed to accommodate a wide range of 3V and 5V logic families. The input threshold voltage is approximately 1.4V with approximately 100mV of hysteresis. The inputs enable the bias generator, the gate charge pumps and the protection circuity which are powered from the 5VIN supply. Therefore, when the inputs are turned off, the entire circuit is powered down and the 5VIN supply current drops below 1µA. |
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