ILC810 Ver la hoja de datos (PDF) - Impala Linear Corporation

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componentes Descripción

Fabricante

ILC810

3-Pin µP Voltage Monitor

Impala Linear Corporation 

3-Pin µP Voltage Monitor

Preliminary

Circuit Description

Microprocessor Reset

The RESET pin is asserted whenever VCC falls below the

reset threshold voltage. The reset pin remains asserted for

a period of 240ms after VCC has risen above the reset

threshold voltage. The reset function ensures the micro-

processor is properly reset and powers up into a known

condition after a power failure. RESET will remain valid

with VCC as low as 1.4V.

VCC

VTH

VCC 3

+

Reset

-

Threshold (V)

Reset

Generator

1

GND

RESET (ILC803, ILC809

2

RESET (ILC810)

Figure 3: Block Diagram

Alternate Source Cross Reference Guide

tR

tR

RESET

Figure 1: Timing Diagram

VCC Transients

The ILC803, ILC809 and ILC810 are relatively immune to

negative-going VCC glitches below the reset threshold.

Typically, a negative-going transient 125mV below the reset

threshold with a duration of 50µs (25µs for ILC8__R/S/T) or

less will not cause an unwanted reset.

Interfacing to Bi-directional Reset Pins

The ILC803/ILC809/ILC810 can interface with µPs with bi-

directional reset pins by connecting a 4.7kΩ resistor in

series with the ILC803/ILC809/ILC810 output and the mP

reset pin. ILC803 connects directly with a single pull-up

resistor (figure 2).

RESET Valid to 0V

A resistor can be added from the RESET pin to ground to

ensure the RESET output remains low with VCC down to

0V. A 100kΩ resistor connected from RESET to ground is

recommended. The size of the resistor should be large

enough to not load the RESET output and small enough to

pull-down any stray leakage currents.

VCC

VCC

ILC803

ILC809

RESET

100K

VCC

ILC803

only

µP

RESET

100K

ILC809

only

Figure 2: Reset valid to VCC

Impala Linear Corporation

ILC803/809/810 1.5

(408) 574-3939

Industry P/N

MAX803XYUR-T

MAX809JEUR-T

MAX809LEUR-T

MAX809MEUR-T

MAX809REUR-T

MAX809SEUR-T

MAX809TEUR-T

MAX810JEUR-T

MAX810LEUR-T

MAX810MEUR-T

MAX810REUR-T

MAX810SEUR-T

MAX810TEUR-T

ILC Direct

Replacement

ILC803YU

ILC809JU

ILC809LU

ILC809MU

ILC809RU

ILC809SU

ILC809TU

ILC810JU

ILC810LU

ILC810MU

ILC810RU

ILC810SU

ILC810TU

Device Markings Information

ILC803J

ILC803L

ILC803M

ILC803R

ILC803S

ILC803T

ILC809J

ILC809L

ILC809M

ILC809R

ILC809S

ILC809T

ILC810J

ILC810L

ILC810M

ILC810R

ILC810S

ILC810T

SC-70 Case

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SOT-23 Case

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www.impalalinear.com

Sept 1999 3

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