Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - system monitor Reset/power-on reset SOIC 8

FUNCTIONAL BLOCK DIAGRAM

RESET

ADM709

RESET

GENERATOR

GND

RESET

ADM709

GND GND

µP

RESET

Typical Operating Circuit

ORDERING GUIDE

Reset Temperature Package

Model Threshold Range Option*

ADM709LAN 4.65 V –40°C to +85°C N-8

ADM709LAR 4.65 V –40°C to +85°C SO-8

ADM709MAN 4.40 V –40°C to +85°C N-8

ADM709MAR 4.40 V –40°C to +85°C SO-8

ADM709TAN 3.08 V –40°C to +85°C N-8

ADM709TAR 3.08 V –40°C to +85°C SO-8

ADM709SAN 2.93 V –40°C to +85°C N-8

ADM709SAR 2.93 V –40°C to +85°C SO-8

ADM709RAN 2.63 V –40°C to +85°C N-8

ADM709RAR 2.63 V –40°C to +85°C SO-8

*N = Plastic DIP; SO = SOIC.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

Power Supply Monitor

with Reset

ADM709

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700 Fax: 617/326-8703

GENERAL DESCRIPTION

The ADM709 contains a power supply monitor which generates

a system reset during power-up, power-down and brownout

conditions. When V

falls below the reset threshold, RESET

goes low and holds the µP in reset. On power-up the

RESET

output is held low for 140 ms after V

rises above the thresh-

old. The

RESET output remains operational with V

as low

as 1 V.

Three supply-voltage threshold levels are available suitable for

+5 V, +3.3 V and for +3 V supply monitoring. The actual reset

voltage threshold is given below.

The ADM709 is available in 8-pin DIP and SOIC packages.

Table I. Reset Threshold

Suffix Voltage (V)

L 4.65

M 4.40

T 3.08

S 2.93

R 2.63

FEATURES

Precision Supply Voltage Monitor

+5 V, +3.3 V, +3 V Power Supply Monitor

35 mA Quiescent Current

140 ms (min) Power-On Reset Pulse

Low Cost

8-Pin DIP/SO Packages

Upgrade for MAX709

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Critical mP Monitoring

Automotive Systems

Critical mP Power Monitoring

Summary of content (4 pages)

PAGE 1
a Power Supply Monitor with Reset ADM709 FEATURES Precision Supply Voltage Monitor +5 V, +3.
PAGE 2
ADM709–SPECIFICATIONS (V CC Parameter Min VCC Operating Voltage Range 1.0 1.2 Supply Current Reset Threshold 4.5 4.25 3.00 2.85 2.55 VCC to RESET Delay RESET Active Time-Out Period = Full Operating Range, TA = TMIN to TMAX unless otherwise noted) Typ Max Units Test Conditions/Comments 35 35 65 65 5.5 5.5 85 110 150 200 V V µA µA µA µA TA = 0°C to +70°C TA = –40°C to +85°C VCC < 3.6 V, TA = 0°C to +70°C VCC < 3.6 V, TA = –40°C to +85°C VCC < 5.5 V, TA = 0°C to +70°C VCC < 5.
PAGE 3
ADM709 RESET at Voltages < 1 V ADM709 VCC RESET GENERATOR VTH The ADM709 RESET output is guaranteed to operate with supply voltages as low as 1 V. If it is desired that the RESET output remains low below 1 V, then a pull-down resistor should be connected between the RESET output and GND. A resistor of 100 kΩ is suitable. This is illustrated in Figure 5. RESET GND Figure 1. Functional Block Diagram ADM709 RESET VCC VCC ADM709 R1 GND µP RESET RESET GND Figure 5.
PAGE 4
ADM709 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8 C2022–18–4/95 8-Lead Plastic DIP (N-8) 5 0.280 (7.11) PIN 1 0.240 (6.10) 1 4 0.325 (8.25) 0.300 (7.62) 0.430 (10.92) 0.348 (8.84) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) MIN 0.160 (4.06) 0.115 (2.93) 0.100 (2.54) BSC 0.022 (0.558) 0.014 (0.356) 0.070 (1.77) 0.045 (1.15) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) SEATING PLANE 8-Lead SOIC (SO-8) 5 8 0.1574 (4.00) 0.1497 (3.80) PIN 1 0.2440 (6.