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
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF
SYMBOL
PARAMETER
TEST CONDITIONS
VCC(V)
MIN
∆f
Oscillator frequency spread
1.0 Any resistor or capacitor according to
–11
6.0 the application information, see note 1 –9
1.0
–
δLED Duty factor at pin 1
See Note 2
6.0
–
1.0
–
δMOLLI Duty factor at pin 6
See Note 3
6.0
–
1.0
–
tdeb
Debounce suppression at pin 9
6.0
–
fi(max)
Maximum frequency at power
sense input
1.0
6.0
100
100
fi(min)
Minimum frequency at power
sense input
1.0
6.0
NOTES:
1.
The
oscillator
frequency
can
be
calculated
by:
f
+
0.36
R C1
2. During blinking.
3. An output signal of four periods will appear in case of discharged batteries and DIS is switched HIGH.
Tamb (°C)
+25
0 to +70
TYP MAX MIN MAX
–4
+3
–2
+5
50
50
50
50
67
65
50
50
UNIT
%
%
%
ms
kHz
Hz
APPLICATION INFORMATION
Oscillator.
The frequency will be determined by the external components RC, RD, RS, and C1. The frequencies can be calculated by the following
expressions:
f
+
0.36 ;
RC C1
f
+
0.36 ;
RD C1
f
+
0.36 .
RS C1
RC and C1 determine the charge time.
RD and C1 determine the discharge time.
RS and C1 determine the self-charge time.
The charge, discharge and self-discharge times can be calculated as follows:
Charge
time
+
222;
fC
Discharge
time
+
218;
fD
Self-discharge
time
+
227
fS
1
In
the
trickle
charge
mode,
the
average
charge
current
will
be
reduced
by
a
factor:
1
)
3
4
x
x
RS
RC
External components range
SYMBOL
PARAMETER
RC/RD
Resistor range
RS
Resistor range
C1
Capacitor range
TEST CONDITIONS
VCC(V)
1.0
2.0
4.5
6.0
1.0
2.0
4.5
6.0
1.0
2.0
4.5
6.0
V1
OTHER
C1 = 0.22 µF
C1 = 0.22 µF
MIN
5.360
1.150
0.562
0.511
42.20
9.09
4.22
3.32
Tamb (°C)
+25
TYP
MAX
100
100
100
100
825
825
825
825
no limit
no limit
no limit
no limit
UNIT
kW
kW
kW
kW
pF
pF
1998 Apr 20
9
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