m51945a Renesas Electronics Corporation., m51945a Datasheet - Page 5

• Manufacturer Part Number: m51945a
• Description: Voltage Detecting, System Resetting Ic Series
• Manufacturer: Renesas Electronics Corporation.

M51945A,B/M51946A,B
Example of Application Circuit
Reset Circuit of M5194xx Series
Notes: 1. When the detecting supply voltage is 4.25 V, M51943 and M51944 are used and R
REJ03D0774-0300 Rev.3.00 Sep 18, 2007
Page 5 of 10
2. If the M5194xx and the logic circuit share a common power source, type A (built-in load type) can be used
3. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor R
4. It is better to use the M5195xx series to cause a delay, but if the delay is caused by the M5194xx series, the
5. When the reset terminal in the logic circuit is of the low reset type, M51943 and M51945 are used and when
6. When a delay is necessary at both rise time and fall time, M51945 and M51946 are used and the series
7. When a negative supply voltage is used, the supply voltage side of M5194xx and the GND side are
When the voltage is anything except 4.25 V, M51945 and M51946 are used. In this case, the detecting
supply voltage is 1.25 × (R
V and 15 V.
whether a pull-up resistor is included in the logic circuit or not.
overcome the pull-down resistor.
delay capacitor Cd is applied between the output and GND.
the terminal is of the high reset type, M51944 and M51946 are used.
resistors (R
between the connection point and GND. The connection point of the capacitor is fixed according to the ratio
of delay at fall/rise time.
connected to GND and the negative supply voltage respectively.
R
R
11
1
2
, R
Input
12
) are applied between the output and GND or instead of R
Figure 1 Reset Circuit of M5194xx Series
M5194xx
1
+R
800
600
400
200
2
Power-
supply
GND
)/R
0
0
2
Circuit Current vs. Supply Voltage
(V) approximately. The detecting supply voltage can be set between 2
Output
Supply Voltage V
Ta = –30°C
(M51945B, M51946B)
4
8
R
Cd
L
Ta = 85°C
Ta = 25°C
12
CC
RESET (RESET)
(V)
Logic circuit
16
Power-
supply
GND
1
, and these connect the capacitor
1
and R
V
CC
2
are not necessary.
L
to