M51954B RENESAS [Renesas Technology Corp], M51954B Datasheet - Page 6

• Manufacturer Part Number: M51954B
• Description: Voltage Detecting, System Resetting IC Series
• Manufacturer: RENESAS [Renesas Technology Corp]

M51953A,B/M51954A,B
Example of Application Circuit
Reset Circuit of M5195xx Series
Notes: 1. When the detecting supply voltage is 4.25 V, M51951, M51952, M51953 and M51954 are used. In this case,
Case of Using Reset Signal except Supply Voltage in the M5195xx Series
(a) Reset at ON
REJ03D0776-0200 Rev.2.00 Aug 20, 2007
Page 6 of 10
(External delay
capacitor type)
GND
M5195xx
2. When the delay time is short, M51951, M51952, M51955 and M51956 are available. These ICs have a
3. If the M5195xx and the logic circuit share a common power source, type A (built-in load type) can be used
4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor R
5. When the reset terminal in the logic circuit is of the low reset type, M51951, M51953, M51955 and M51957
6. When a negative supply voltage is used, the supply voltage side of M5195xx and the GND side are
R
When the voltage is anything except 4.25 V, M51955, M51956, M51957 and M51958 are used. In this case,
the detecting supply voltage is 1.25 × (R
set between 2 V and 15 V.
delay capacity and the delay time is about 200 µs.
If a longer delay time is necessary, M51953, M51954, M51957 and M51958 are used. In this case, the delay
time is about 0.34 × Cd (pF) µs.
whether a pull-up resistor is included in the logic circuit or not.
overcome the pull-down resistor.
are used and when the terminal is of the high reset type, M51952, M51954, M51956 and M51958 are used.
connected to negative supply voltage respectively.
Figure 2 Case of Using Reset Signal except Supply Voltage in the M5195xx Series
1
Power-
supply
and R
2
Cd
Delay capacitor
Out
put
are not necessary.
R
GND
L
M51953x
M51954x
RESET (RESET)
Figure 1 Reset Circuit of M5195xx Series
Logic circuit
Power-
supply
Power-
supply
GND
Cd
Delay capacitor
Output
1
+R
V
CC
2
R
)/R
L
Control
signal
2
(b) Reset at transistor ON
(V) approximately. The detecting supply voltage can be
(External delay
capacitor type)
RESET (RESET)
GND
M5195xx
Logic circuit
Power-
supply
Power-
supply
GND
Cd
Delay capacitor
Out
put
R
V
L
CC
RESET (RESET)
Logic circuit
Power-
supply
GND
L
V
CC
to