hcf4047 STMicroelectronics, hcf4047 Datasheet - Page 6

• Manufacturer Part Number: hcf4047
• Description: Low Power Monostable/astable Multivibrator
• Manufacturer: STMicroelectronics

HCF4047B
DYNAMIC ELECTRICAL CHARACTERISTICS (T
(*) Typical temperature coefficient for all V
APPLICATION INFORMATION
1 - CIRCUIT DESCRIPTION
Astable operation is enabled by a high level on the
ASTABLE input. The period of the square wave at
the Q and Q Outputs in this mode of operation is a
function of the external components employed.
"True" input pulses on the ASTABLE input or
"Complement" pulses on the ASTABLE input
allow the circuit to be used as a gatable
multivibrator. The OSCILLATOR output period will
be half of the Q terminal output in the astable
mode. However, a 50% duty cycle is not
guaranteed at this output. In the monostable
6/12
t
t
Symbol
PLH
THL
t
t
r
, t
W
t
t
PHL
TLH
f
Propagation Delay
Time
Transition Time Osc. Out Q, Q
Input Pulse Width
Input Rise and Fall Time All Inputs
Q or Q Deviation from 50% Duty
Factor
Parameter
Astable, Astable
to Osc. Out
Astable, Astable
to Q, Q
+ or - Trigger to
Q, Q
Retrigger to Q, Q
External Reset
to Q, Q
+ Trigger
- Trigger
Reset
Retrigger
DD
value is 0.3 %/°C.
V
DD
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
5
5
5
5
5
5
5
5
5
5
5
(V)
amb
Test Condition
mode, positive-edge triggering is accomplished by
application of a leading-edge pulse to the
+TRIGGER input and a low level to the -TRIGGER
input. For negative-edge triggering, a trailing-edge
pulse is applied to the -TRIGGER and a high level
is applied to the +TRIGGER. Input pulses may be
of any duration relative to the output pulse. The
multivibrator can be retriggered (on the leading
edge only) by applying a common pulse to both
the RETRIGGER and +TRIGGER inputs. In this
mode the output pulse remains high as long as the
input pulse period is shorter than the period
determined by the RC components. An external
countdown option can be implemented by
= 25°C, C
L
= 50pF, R
L
= 200K , t
Min.
Unlimited
Value (*)
Typ.
200
100
350
175
125
500
225
150
300
150
100
250
100
100
200
100
300
115
80
70
50
40
80
50
50
30
75
0.5
0.5
0.1
r
= t
Max.
1000
400
200
160
700
350
250
450
300
600
300
200
500
200
140
200
100
400
160
100
200
100
600
230
150
80
60
f
0.5
1
1
= 20 ns)
Unit
ns
ns
ns
%
s