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ST7920 데이터시트(PDF) 43 Page - Sitronix Technology Co., Ltd. |
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ST7920 데이터시트(HTML) 43 Page - Sitronix Technology Co., Ltd. |
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43 / 49 page ![]() ST7920 V4.0 43/49 2008/08/18 AC Characteristics (TA = -30℃ ~ 85℃, VDD = 4.5V) Serial Mode Interface Symbol Characteristics Test Condition Min. Typ. Max. Unit Internal Clock Operation fOSC OSC Frequency R = 33K Ω 470 530 590 KHz External Clock Operation fEX External Frequency - 470 530 590 KHz Duty Cycle - 45 50 55 % TR,TF Rise/Fall Time - - - 0.2 µs TSCYC Serial clock cycle Pin E 400 - - ns TSHW SCLK high pulse width Pin E 200 - - ns TSLW SCLK low pulse width Pin E 200 - - ns TSDS SID data setup time Pins RW 40 - - ns TSDH SID data hold time Pins RW 40 - - ns TCSS CS setup time Pins RS 60 - - ns TCSH CS hold time Pins RS 60 - - ns AC Characteristics (TA = -30℃ ~ 85℃, VDD = 2.7V) Serial Mode Interface Symbol Characteristics Test Condition Min. Typ. Max. Unit Internal Clock Operation fOSC OSC Frequency R = 18K Ω 470 530 590 KHz External Clock Operation fEX External Frequency - 470 530 590 KHz Duty Cycle - 45 50 55 % TR,TF Rise/Fall Time - - - 0.2 µs TSCYC Serial clock cycle Pin E 600 - - ns TSHW SCLK high pulse width Pin E 300 - - ns TSLW SCLK low pulse width Pin E 300 - - ns TSDS SID data setup time Pins RW 40 - - ns TSDH SID data hold time Pins RW 40 - - ns TCSS CS setup time Pins RS 60 - - ns TCSH CS hold time Pins RS 60 - - ns |
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