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74HCT5555D 数据表(PDF) 22 Page - NXP Semiconductors |
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74HCT5555D 数据表(HTML) 22 Page - NXP Semiconductors |
22 / 23 page September 1993 22 Philips Semiconductors Product specification Programmable delay timer with oscillator 74HC/HCT5555 Minimum Output Pulse Width The minimum output pulse width is determined by the minimum clock pulse width, plus the maximum propagation delay of A, B to Q. The rising edge of Q is dominated by the A, B to Q propagation delay, while the falling edge of Q is dominated by RS to Q propagation delay. These propagation delays are not equal. The RS to Q propagation delay is some what longer, resulting in inaccurate outputs for extremely short pulses. The propagation delays are listed in the section 'AC Characteristics'. With these numbers it is possible to calculate the maximum deviation (an example is shown in Fig.16). Figure 16 is valid for an external clock where the trigger is synchronized to the falling edge of the clock only. The graph shows that the minimum programmed pulse width of 100 ns is: • minimum of 4% too long • typically 7% too long • maximum of 10% too long. SYNCHRONIZATION LIMITS NUMBER OF STAGES SELECTED CLOCK FREQUENCY (TYPICAL) 1 18 MHz 2 14 MHz 3 11 MHz 4 9.6 MHz 5 8.3 MHz 6 7.3 MHz 7 6.6 MHz 8 6 MHz .. 17 3.2 MHz 18 3.0 MHz 19 2.9 MHz 20 2.8 MHz 21 2.7 MHz 22 2.6 MHz 23 2.5 MHz 24 2.4 MHz |
类似零件编号 - 74HCT5555D |
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类似说明 - 74HCT5555D |
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