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74LV4799N Datasheet(PDF) 6 Page - NXP Semiconductors |
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74LV4799N Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 18 page Philips Semiconductors Product specification 74LV4799 Timer for NiCd and NiMH chargers 1998 Apr 20 6 FUNCTION TABLE 2 STATUS INPUTS OUTPUTS COUNTER STATUS INDICATION PWRS DIS SEL(1) LED MOLLI MODE VALUE Charge H or H L L Z Count up < max Charge H or H H or open Z Count up < max Charge/discharge H or L L L Z Count down ≥ min Trickle charge H or H L Z Stop max Trickle charge H or H H or open L Z Stop max Discharge L or open L X Z Z Count down > min Self-discharge L or open H X Z Z Count down > min Low L or open ↑ X Z Stop min Low ↑ ↑ X Z Z(2) Count up ≥ min Alarm H or L H or open Z Count down ≥ min NOTES: 1. Don’t change SEL during operation. 2. The MOLLI function will be interrupted as soon as PWRS is activated. H = HIGH voltage level L = LOW voltage level Z = high impedance OFF-state X = don’t care = pulsed (H/L) = pulsed (Z/L) = 4 periods of about one second (Z/L) ↑ = LOW-to-HIGH level transition SV01646 R C Z–state Z–state Z–state Z–state Z–state R S I OSC EN EN Operation in the trickle charge mode. The duration of the RC cycle determines the duty cycle of the enable outputs (EN and EN), allowing a dedicated control. The average trickle charge current will compensate for the self-discharge, independent of the charge current. Figure 1. Trickle charge mode characteristics. |
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