ne56610 NXP Semiconductors, ne56610 Datasheet - Page 10

• Manufacturer Part Number: ne56610
• Description: Family Of Devices Designed To Generate A Reset Signal For A Variety Of Microprocessor And Logic Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
When the manual reset is not needed, the M/R, manual reset pin is
connected to ground as shown in Figure 18. A capacitor connected
from V
impedance is appreciably high. This may be the situation with a poor
quality or aged battery.
Figure 19 shows a circuit with a manual reset switch. When the
manual switch is closed, V
Conversely, when it is opened, V
As a precaution, a clamp diode is placed from the M/R pin to ground
to ensure that the pin does not go below –0.3 V.
TEST CIRCUITS
2003 Oct 31
System reset
TO V
CC
V
CC
to ground is recommended when the V
CC
A = DC AMPMETER
V = DC VOLTMETER
Figure 18. Typical hard reset circuit
V1
Figure 20. Test circuit 1
10 F/10 V
V
M/R
A2
1
5
CC
OUT
V
A1
reset is a low voltage state.
M/R
R
SUB
OUT
2
PU
V
M/R
1
5
CC
reset is a HIGH voltage state.
V
GND
R
OUT
4
3
PU
SUB
2
V
CC
GND
OUT
4
3
supply
SL01385
TO CPU
RESET PIN
SL01383
V2
10
When a manual reset is used, it is suggested a resistor (R
connected from the M/R pin to ground so as to provide a pull-down
ground reference for the M/R pin when not in use. This will reduce
the possibility of an induced erroneous voltage being imposed on
the M/R pin. This can be a solution in noisy applications where the
manual reset line is of considerable length and subject to picking up
induced voltages. The M/R pin can be pulled to a HIGH voltage
state whenever a manual reset is imposed. The only disadvantage
to this is a small amount of additional current flow through the
pull-down ground reference resistor when the M/R pin is pulled to a
HIGH state.
PULSE
INPUT
MANUAL
SWITCH
TO V
CC
CLAMP
DIODE
CRT = OSCILLOSCOPE
INPUT PULSE
Figure 19. Manual Reset circuit
V
M/R
5
1
CC
V
V
Figure 21. Test circuit 2
S(typ)
S(typ)
V
M/R
1
5
CC
SUB
+ 0.4 V
– 0.4 V
2
R
PD
0 V
NE56610/11/12-XX
R
V
SUB
2
GND
PU
OUT
4
3
100 pF
V
GND
OUT
4
3
C
L
R
PU
CRT
TO CPU
RESET PIN
10 F/10 V
Product data
PU
SL01384
SL01386
5.0 V
) be