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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87413 датащи(PDF) 246 Page - National Semiconductor (TI) |
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PC87413 датащи(HTML) 246 Page - National Semiconductor (TI) |
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246 / 257 page  11.0 Device Characteristics (Continued) www.national.com 246 Revision1.2 11.5.6 ACCESS.bus Timing (PC87413 and PC87417) Figure 63. ACCESS.bus Signals (ACBCLK and ACBDAT) Rising Time and Falling Time Symbol Figure Description Type of Requirement1 1. An “Input” type is a value the PC8741x device expects from the system; an “Output” type is a value the PC8741x device provides to the system. Min Max Unit tACBR 63 Rise time (ACBCLK and ACBDAT) Input2 2. Test conditions: RL = 1 KΩ to VSB = 3.3V, CL = 400 pF to GND. 10003 3. Not tested. Guaranteed by design. ns tACBF 63 Fall time (ACBCLK and ACBDAT) Input 3003 ns Output2 2504 4. Not tested. Guaranteed by characterization. ns tACBCKL 63 Clock low period (ACBCLK) Input 4.7 µs tACBCKH 63 Clock high period (ACBCLK) Input 4 µs tACBCY 64 Clock cycle (ACBCLK) Input 10 µs tACBDS 64 Data setup time (before clock rising edge) Input 250 ns Output2 250 ns tACBDH 64 Data hold time (after clock falling edge) Input 0 ns Output2 300 ns tACBPS 65 Stop condition setup time (clock before data) Input 4 µs tACBSH 65 Start condition hold time (clock after data) Input 4 µs tACBBUF 65 Bus free time between Stop and Start conditions (ACBDAT) Input 4.7 µs tACBRS 66 Restart condition setup time (clock before data) Input 4.7 µs tACBRH 66 Restart condition hold time (clock after data) Input 4 µs tACBLEX - Cumulative clock low extend time from Start to Stop (ACBCLK) Output 253 ms tACBTO - Clock low time-out (ACBCLK) Input 253,5 5. The PC8741x device detects a time-out condition if ACBCLK is held low for more than tACBTO. ms Output 353,6 6. On detection of a time-out condition, the PC8741x device resets the ACCESS.bus Interface no later than tACBTO. ms tACBR 2.5V 0.4V tACBF 3.0V 0.4V 2.5V 0.4V 0.4V tACBCKH tACBCKL |
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