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AT89C51AC3-RDTIM Datasheet(PDF) 130 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM Datasheet(HTML) 130 Page - ATMEL Corporation |
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130 / 140 page  130 AT89C51AC3 4383D–8051–02/08 Table 80. AC Parameters for a Fix Clock (F = 40 MHz) Table 81. AC Parameters for a Variable Clock Shift Register Timing Waveforms External Clock Drive Characteristics (XTAL1) Table 82. AC Parameters Symbol Min Max Units T XLXL 300 ns T QVHX 200 ns T XHQX 30 ns T XHDX 0 ns T XHDV 117 ns Symbol Type Standard Clock X2 Clock X parameter for -M range Units T XLXL Min 12 T 6 T ns T QVHX Min 10 T - x 5 T - x 50 ns T XHQX Min 2 T - x T - x 20 ns T XHDX Min x x 0 ns T XHDV Max 10 T - x 5 T- x 133 ns VALID VALID VALID VALID VALID VALID INPUT DATA VALID 0 1 2 3 4 5 6 8 7 ALE CLOCK OUTPUT DATA WRITE to SBUF CLEAR RI T XLXL T QVXH TXHQX T XHDV T XHDX SET TI SET RI INSTRUCTION 0 1 2 3 4 5 6 7 VALID Symbol Parameter Min Max Units T CLCL Oscillator Period 25 ns T CHCX High Time 5 ns T CLCX Low Time 5 ns T CLCH Rise Time 5 ns T CHCL Fall Time 5 ns T CHCX/TCLCX Cyclic ratio in X2 mode 40 60 % |
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