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HT2844 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc |
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HT2844 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc |
3 / 18 page Pin No. Pin Name I/O Description 12 KEY1 I KEY1 input, low active 13 KEY2 I KEY2 input, low active 14 KEY3 I KEY3 input, low active 15 KEY4 I KEY4 input, low active 16 LED O LED flash output Absolute Maximum Ratings* Supply Voltage ................................. –0.3V to 5V Storage Temperature................. –50 °C to 125°C Input Voltage.................... VSS–0.3 to VDD+0.3V Operating Temperature................... 0 °C to 70°C *Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damageto the device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (Ta=25 °C) Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage — — 2.4 3 3.3 V ISTB Standby Current 3V — — 1 5 µA IDD Operating Current 3V No load — 300 600 µA IOH OUT Source Current 3V VOH=2.5V –1 –2 — mA IOL OUT Sink Current 3V VOL=0.5V 1 2 — mA ILED LED Source Current 3V VOL=2.5V –1 –2 — mA FOSC Oscillator Frequency — R=220k Ω — 128 — kHz VIH “H” Input Voltage 3V — 2.4 — — V VIL “L” Input Voltage 3V — — — 0.6 V HT2844 3 11th July ’97 |
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