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74LV4799 Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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74LV4799 Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 18 page Philips Semiconductors Product specification 74LV4799 Timer for NiCd and NiMH chargers 1998 Apr 20 10 Charge discharge times PARAMETER TIME RANGE CONDITIONS Charge time 4 hours to 16 hours Components ranges are within the values Discharge time 15 minutes to to 4.7 hours Components ranges are within the values given in Section “External components range” Self-discharge time 50 days to 100 days given in Section External com onents range LED frequency The frequency of the LED output (pin1) is determined by the oscillator frequency. Three modes of operation, each with its own frequency, are possible. f D 32 1 8 f C ) 6 f S f C 256 Mode SEL LED frequency Charge Trickle charge Alarm H or open L H MOLLI pulse duration The MOLLI output gives an output signal of four periods with a 50% duty cycle. The duration of one period is determined by: 16/fs Timing accuracy. The timing accuracy depends on the accuracy of the on–chip oscillator and on the external R and C components. The inaccuracy of the on–chip oscillator is specified as maximum +/–7%. In most cases the actual inaccuracy will be significantly lower. This depends on the supply voltage as well as the value of the external components. Influence of Resistor value. Low resistor values cause some spread because the RC combination is biased by a 3–State push–pull output. The spread of the Ron of the push–pull stage will contribute to the frequency spread. When high–value resistors are used, any possible output leakage of the not–selected 3–State outputs will cause a frequency deviation. For these reasons, the resistor values must be within the specified ranges. Influence of supply voltage The trip levels of the oscillator are fixed at 20% and 80% of Vcc. At higher supply voltages the spread of the trip levels decreases in greater proportion because the offset voltage remains constant, and the propagation delay decreases. Furthermore, the Ron values of the push–pull driving stage decrease at higher voltages. SPREAD-CAUSING FACTORS SYMBOL PARAMETER VCC Tamb (°C) UNIT SYMBOL PARAMETER CC (V) MIN TYP MAX UNIT V ff Offset voltage 1.0 7 mV Voff Offset voltage 6.0 7 mV tP Propagation delay 1.0 22 ms tP Pro agation delay 6.0 5.5 ms RON P-channel resistance RC RD outputs 1.0 170 W RON P-channel resistance RC, RD out uts 6.0 25 W RON N-channel resistance RC RD outputs 1.0 250 W RON N-channel resistance RC, RD out uts 6.0 35 W RON P-channel resistance RS output 1.0 1300 W RON P-channel resistance RS out ut 6.0 180 W RON N-channel resistance RS output 1.0 1300 W RON N-channel resistance RS out ut 6.0 180 W |
Podobny numer części - 74LV4799 |
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Podobny opis - 74LV4799 |
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