74lv4799 NXP Semiconductors, 74lv4799 Datasheet - Page 6

• Manufacturer Part Number: 74lv4799
• Description: Timer For Nicd And Nimh Chargers
• Manufacturer: NXP Semiconductors

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