M51957BL Renesas Electronics America, M51957BL Datasheet - Page 11

• Manufacturer Part Number: M51957BL
• Description: IC VOLTAGE DETECTOR 5-SIP
• Manufacturer: Renesas Electronics America
• Type: Simple Reset/Power-On Resetr

Specifications of M51957BL

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 1.6 ms Minimum
• Voltage - Threshold: 1.25V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 5-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

M51957A,B/M51958A,B
3. Calculation of detecting voltage
4. About the voltage input outside ratings
REJ03D0778-0300 Rev.3.00 Sep 18, 2007
Page 9 of 13
Detecting voltage Vs can be calculated by the following expression.
However, the error margin is caused in the detecting voltage because input current Iin (standard 100 nA) exists if it
sets too big resistance.
Please set the constant to disregard this error margin.
Please do not input the voltage outside ratings to the input terminal.
An internal protection diode becomes order bias, and a large current flows.
V
Vin
Example 1. Independent power supply system
V
S
CC
= 1.25 ×
1
Independent
Input
Please do enough verifying about
transition characteristic of V
and V
GND
R
1
R
+ R
CC
2
M51957
M51958
2.
2
V
CC
Power-supply
+ Iin × R
2
error margin
V
CC
R
R
Vin
Figure 8 Influence of Input Current
1
2
Delay capacitor
Cd
1
Output
Input
Iin
→
CC
1
GND
Figure 7
M51957
M51958
GND
Power-supply
V
CC
Vin
Delay capacitor
Cd
Example 2. Logic pulse input
Independent
Output
Input
GND
(not recommended)
M51957
M51958
V
CC
Power-supply
Delay capacitor
Cd
Output