74LV4799N Ver la hoja de datos (PDF) - Philips Electronics
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74LV4799N Datasheet PDF : 18 Pages
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Philips Semiconductors
Timer for NiCd and NiMH chargers
Product specification
74LV4799
FUNCTION TABLE 2
STATUS
INDICATION
Charge
Charge/discharge
Trickle charge
Discharge
Self-discharge
Low
Low
Alarm
PWRS
H or
H or
H or
H or
H or
L or open
L or open
L or open
↑
H or
INPUTS
DIS
H
H
L
H
H
L
H
↑
↑
L
SEL(1)
L
H or open
L
L
H or open
X
X
X
X
H or open
OUTPUTS
LED
MOLLI
L
Z
Z
L
Z
Z
L
Z
Z
Z
Z
Z
Z
Z
Z(2)
Z
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
Z–state
RC
Z–state
Z–state
RS
COUNTER
MODE
Count up
Count up
Count down
Stop
Stop
Count down
Count down
Stop
Count up
Count down
VALUE
< max
< max
≥ min
max
max
> min
> min
min
≥ min
≥ min
Z–state
I OSC
EN
Z–state
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.
SV01646
1998 Apr 20
6
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