MB3773 datasheet(22/31 Pages) CYPRESS

Part #	MB3773

Description	Power Supply Monitor with Watch-Dog Timer

PDF	31 Pages

Scroll/Zoom	100%

Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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22 / 31 page

MB3773

Document Number: 002-08513 Rev. *A

Page 22 of 31

EXAMPLE 9: Reducing Reset Hold Time

VCC(  5

MB3773

RESET

GND

Logic circuit

(a) TPR reduction method

VCC (

 5 V)

MB3773

RESET

GND

Logic circuit

Notes :

• RESET is the only output that can be used.

• Standard TPR, TWD and TWR value can be found using the following formulas.

Formulas:TPR (ms) := 100 × CT (μF)

TWD (ms) := 100 × CT (μF)

TWR (ms) := 16 × CT (μF)

• The above formulas become standard values in determining TPR, TWD and TWR.

Reset hold time is compared below between the reduction circuit and the standard circuit.

(b) Standard usage

CT  0.1 μF

TPR reduction circuit

Standard circuit

TPR :=

10 ms

100 ms

TWD :=

10 ms

TWR :=

1.6 ms

2.0 ms

MB3773 Datasheet(PDF) 22 Page - Cypress Semiconductor