RNA51955AFPH0 datasheet(9/12 Pages) RENESAS

tên linh kiện	RNA51955AFPH0

Giải thích chi tiết về linh kiện	Voltage Detecting, System Resetting IC Series

PDF	12 Pages

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nhà sản xuất	RENESAS [Renesas Technology Corp]

Trang chủ	http://www.renesas.com

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9 / 12 page

RNA51955A, B

Preliminary

R03DS0004EJ0202 Rev.2.02

Page 9 of 11

Apr 19, 2011

Power-supply

Output

Vin

RNA51955

Input

GND

VCC1

VCC2

Independent

Power-supply

Output

Input

GND

VCC

Vin

GND

VCC

Example 1. Independent power supply system

Please do enough verifying about

transition characteristic of VCC1

and VCC2.

Example 2. Logic pulse input

(not recommended)

Figure 4

3. Calculation of detecting voltage

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.

VS = 1.25 ×

+ Iin

× R1

error margin

R1 + R2

Power-supply

Output

Vin

Iin

→

RNA51955

GND

Input

VCC

Figure 5 Influence of Input Current

4. About the voltage input outside ratings

Please do not input the voltage outside ratings to the input terminal.

An internal protection diode becomes order bias, and a large current flows.

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