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ATtiny88 数据表(PDF) 204 Page - ATMEL Corporation |
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ATtiny88 数据表(HTML) 204 Page - ATMEL Corporation |
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204 / 266 page ![]() 204 8008C–AVR–03/09 ATtiny48/88 Note: All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrollers manufactured in the same process technology. These values are pre- liminary, representing design targets, and will be updated after characterization of actual silicon. 21.5 System and Reset Characterizations Note: 1. Values are guidelines, only 2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling) Table 21-2. External Clock Drive Symbol Parameter VCC=1.8-5.5V VCC=2.7-5.5V VCC=4.5-5.5V Units Min. Max. Min. Max. Min. Max. 1/tCLCL Oscillator Frequency 02 06 0 12 MHz tCLCL Clock Period 250 166 83 ns tCHCX High Time 120 80 40 ns tCLCX Low Time 120 80 40 ns tCLCH Rise Time 2.0 1.6 0.5 μs tCHCL Fall Time 2.0 1.6 0.5 μs Δt CLCL Change in period from one clock cycle to the next 22 2 % Table 21-3. Reset, Brown-out, and Internal Voltage Characteristics (1) Symbol Parameter Condition Min Typ Max Units VPOT Power-on Reset Threshold Voltage (rising) TA = -40 – 85°C1.5 V Power-on Reset Threshold Voltage (falling)(2) T A = -40 – 85°C1.2 V VRST RESET Pin Threshold Voltage 0.2 V CC 0.9V CC V tRST Minimum pulse width on RESET Pin V CC = 1.8V V CC = 3V VCC = 5V 2000 700 400 ns VHYST Brown-out Detector Hysteresis 50 mV t BOD Min Pulse Width on Brown-out Reset 2µs VBG Internal bandgap reference voltage V CC = 5V TA =25°C 1.0 1.1 1.2 V tBG Internal bandgap reference start-up time V CC = 5V TA =25°C 40 70 µs IBG Internal bandgap reference current consumption VCC = 5V T A =25°C 15 µA |
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