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HT1621 数据表(PDF) 8 Page - Holtek Semiconductor Inc |
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HT1621 数据表(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 20 page  A.C. Characteristics Ta=25°C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock 3V On-chip RC oscillator ¾ 256 ¾ kHz 5V ¾ 256 ¾ kHz fSYS2 System Clock 3V Crystal oscillator ¾ 32.768 ¾ kHz 5V ¾ 32.768 ¾ kHz fSYS3 System Clock 3V External clock source ¾ 256 ¾ kHz 5V ¾ 256 ¾ kHz fLCD LCD Clock ¾ On-chip RC oscillator ¾ fSYS1/1024 ¾ Hz ¾ Crystal oscillator ¾ fSYS2/128 ¾ Hz ¾ External clock source ¾ fSYS3/1024 ¾ Hz tCOM LCD Common Period ¾ n: Number of COM ¾ n/fLCD ¾ s fCLK1 Serial Data Clock (WR pin) 3V Duty cycle 50% ¾¾ 150 kHz 5V ¾¾ 300 kHz fCLK2 Serial Data Clock (RD pin) 3V Duty cycle 50% ¾¾ 75 kHz 5V ¾¾ 150 kHz fTONE Tone Frequency ¾ On-chip RC oscillator ¾ 2.0 or 4.0 ¾ kHz tCS Serial Interface Reset Pulse Width (Figure 3) ¾ CS ¾ 250 ¾ ns tCLK WR,RD Input Pulse Width (Figure 1) 3V Write mode 3.34 ¾¾ ms Read mode 6.67 ¾¾ 5V Write mode 1.67 ¾¾ ms Read mode 3.34 ¾¾ tr,tf Rise/Fall Time Serial Data Clock Width (Figure 1) 3V ¾¾ 120 ¾ ns 5V tsu Setup Time for DATA to WR, RD Clock Width (Figure 2) 3V ¾¾ 120 ¾ ns 5V th Hold Time for DATA to WR, RD Clock Width (Figure 2) 3V ¾¾ 120 ¾ ns 5V tsu1 Setup Time for CS to WR,RD Clock Width (Figure 3) 3V ¾¾ 100 ¾ ns 5V th1 Hold Time for CS to WR,RD Clock Width (Figure 3) 3V ¾¾ 100 ¾ ns 5V HT1621 8 April 21, 2000 |
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