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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD6417618 датащи(PDF) 572 Page - Renesas Technology Corp |
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HD6417618 датащи(HTML) 572 Page - Renesas Technology Corp |
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572 / 646 page  Section 21 Electrical Characteristics Rev. 6.00 Jun. 12, 2007 Page 540 of 610 REJ09B0131-0600 21.2 Power-On and Power-Off Order • Order of turning on 1.5-V system power (V CC (main), VCC (sub), VCC (PLL1), and VCC (PLL2)) and 3.3-V system power (V CCQ) First turn on the 3.3-V system power, then turn on the 1.5-V system power within 1 ms. This time should be as short as possible. The system design must ensure that the states of pins or undefined period of an internal state do not cause erroneous system operation. Until voltage is applied to all power supplies and a low level is input to the RES pin, internal circuits remain unsettled, and so pin states are also undefined. The system design must ensure that these undefined states do not cause erroneous system operation. Waveforms at power-on are shown in the following figure. VccQ (min.) power Vcc (min.) Vcc/2 VccQ : 3.3-V system power Vcc : 1.5-V system power t PWU t UNC GND Pin states undefined Normal operation period Input low level in advance Power-on reset state Pin states undefined RES Other pins * Note: * Except power/GND and clock related pins Table 21.2 Recommended Timing at Power-On Item Symbol Maximum Value Unit Time difference between turning on V CCQ and VCC t PWU 1 ms Time over which the internal state is undefined t UNC 100 ms Note: * The values shown in table 21.2 are recommended values, so they represent guidelines rather than strict requirements. |
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