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ST72E331 数据表(PDF) 94 Page - STMicroelectronics |
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ST72E331 数据表(HTML) 94 Page - STMicroelectronics |
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94 / 107 page  94/107 ST72E331 ST72T331 7.3 RESET CHARACTERISTICS (TA=-40...+125 oC and V DD=5V±10% unless otherwise specified. Note: 1) These values given only as design guidelines and are not tested. 7.4 OSCILLATOR CHARACTERISTICS (TA = -40°C to +125°C unless otherwise specified) Symbol Parameter Conditions Min Typ 1) Max Unit RON Reset Weak Pull-up RON VIN > VIH VIN < VIL 20 60 40 120 80 240 k Ω tRESET Pulse duration generated by watch- dog and POR reset 1 µs tPULSE Minimum pulse duration to be ap- plied on external RESET pin 10 1) ns Symbol Parameter Test Conditions Value Unit Min. Typ. Max. gm Oscillator transconductance 2 9 mA/V fOSC Crystal frequency 1 16 MHz tstart Osc. start up time VDD = 5V±10% 50 ms 94 |
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