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U6803B Datasheet(PDF) 3 Page - ATMEL Corporation |
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U6803B Datasheet(HTML) 3 Page - ATMEL Corporation |
3 / 7 page 3 U6803B 4762A–AUTO–11/03 Basic Circuitry The integrated circuit U6803B requires a stabilized supply voltage (VS = 5 V ±5%) to comply with its electrical characteristics. An external buffer capacitor of C = 100 nF is recommended. An integrated 14 V Zener diode between VS and ground protects the supply pin. All input stages are provided with an integrated 250 k W pull-up resistor and can be directly connected to a microcontroller. All output stages are open collectors, each capable of sinking 20 mA. Recommended external components: • Pull-up resistor, R = 1 k W • Capacitor to GND, C = 470 pF, see Figure 3 on page 4 Functional Description General ON state: A low level at the input stage activates the corresponding output stage. OFF state: The internal pull-up resistor provides a high level to the input comparator and deactivates the output stage. 7 V Zener diodes between each input pin and GND are capable of ±10 mA clamping currents without crosstalk on adjacent input stages. A total clamping current of ±30 mA should be observed with respect to the power dissipation. Current Limitation of the Output Stages and Overtemperature Shutdown A temperature-dependent current limitation in the range of 25 to 100 mA protects the stages in case of a short. Additionally, the chip temperature is monitored. For TChip > 148°C, all outputs are disabled and automatically enabled with a hysteresis of TChip >5°C. Transients and Load Dump An integrated 28 V Zener diode protects each output stage against transients and load- dump (Schaffner pulses). With the help of an external 1 k W resistor, the output transistor is capable of handling the corresponding current which flows during each of these condi- tions. Apart from that, the outputs are short-circuit and overload protected. Low-voltage Detection When the supply voltage is switched on, a power-on reset pulse is generated internally which disables all output stages until a defined supply-voltage level is reached. The low-voltage detection is provided with a hysteresis of V hyst = 0.5 V typically. |
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