IMP IMP812REUS-T, IMP812MEUS-T, IMP812LEUS-T, IMP812JEUS-T, IMP811TEUS-T Datasheet

©

1999 IMP, Inc. 408-432-9100/www.impweb.com 1

Key Features

Applications

4-Pin

4-Pin µµ

P V

P V

olt

olt

ag

ag

e Super

e Super

visor

visor

wit

wit

h Manual R

h Manual R

eset

eset

◆ Computers and controllers

◆ Embedded controllers

◆ Battery operated systems

◆ Intelligent instruments

◆ Wireless communication systems

◆ PDAs and handheld equipment

◆

Improved Maxim MAX811/MAX812 replacement
—

Specified to 105°C

—

New 4.0V threshold option

◆

6µA supply current

◆

Monitor 5V, 3.3V and 3V supplies

◆

Manual reset input

◆

140ms min. reset pulse width

◆

Guaranteed over temperature

◆

Active-LOW reset valid with 1.1V supply
(IMP811)

◆

Small 4-pin SOT-143 package

◆

No external components

◆

Power-supply transient-immune design

Block Diagrams

IMP811

(IMP812)

V

CC

V

CC

V

CC

GND GND

RESET

(RESET)

Manual

Reset

MR

811/12_01.eps

µC or µP

RESET
Input

The IMP811/IMP812 are low-power supervisors designed to monitor
voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power
microprocessor (µP), microcontroller (µC) and digital systems. Each fea­tures a debounced manual reset input. The IMP811/812 are improved
drop-in replacements for the Maxim MAX811/812 with extended
temperature specifications to 105°C.

A reset signal is issued if the power supply voltage drops below a preset
threshold and is asserted for at least 140ms after the supply has risen
above the reset threshold. The IMP811 has an active-low output RESET
that is guaranteed to be in the correct state for V

CC

down to 1.1V. The
IMP812 has an active-high output RESET. The reset comparator is
designed to ignore fast transients on V

CC

.

Low power consumption makes the IMP811/IMP812 ideal for use in
portable and battery-operated equipment. Available in a compact 4-pin
SOT143 package, the devices use minimal board space.

Six voltage thresholds are available to support 3V to 5V systems:

IMP8

IMP81111

, IMP8

, IMP81122

POWER MANAGEMENT

Reset Threshold

Suffix Voltage (V)

L 4.63

M 4.38

J 4.00

T 3.08

S 2.93

R 2.63

IMP8

IMP81111

, IMP8

, IMP81122

2

408-432-9100/www.impweb.com

©

1999 IMP, Inc.

Ordering Information

Pin Configuration

IMP811

(IMP812)

GND

(RESET) RESET

V

CC

4

MR

3

2

1

811/12_02.eps

SOT143

Package Marking

2

Part Number

1

Reset Threshold (V) Temperature Range Pin-Package

(XX Lot Code)

IMP811 Active LOW Reset with Active LOW Manual Reset

IMP811LEUS-T 4.63 –40°C to +105°C 4-SOT143 AMXX

IMP811MEUS-T 4.38 –40°C to +105°C 4-SOT143 ANXX

IMP811JEUS-T 4.00 – 40°C to +105°C 4-SOT143 AOXX

IMP811TEUS-T 3.08 –40°C to +105°C 4-SOT143 APXX

IMP811SEUS-T 2.93 –40°C to +105°C 4-SOT143 AQXX

IMP811REUS-T 2.63 –40°C to +105°C 4-SOT143 ARXX

IMP812 Active HIGH Reset with Active LOW Manual Reset

IMP812LEUS-T 4.63 –40°C to +105°C 4-SOT143 ASXX

IMP812MEUS-T 4.38 –40°C to +105°C 4-SOT143 ATXX

IMP812JEUS-T 4.00 – 40°C to +105°C 4-SOT143 AUXX

IMP812TEUS-T 3.08 – 40°C to +105°C 4-SOT143 AVXX

IMP812SEUS-T 2.93 –40°C to +105°C 4-SOT143 AWXX

IMP812REUS-T 2.63 –40°C to +105°C 4-SOT143 AXXX

Pin Terminal Voltage with Respect to Ground

V

CC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 6.0V

RESET, RESET and MR . . . . . . . . . . . . . . . . . –0.3V to (V

CC

+ 0.3V)

Input Current at V

CC

and MR . . . . . . . . . . . 20mA

Output Current: RESET or RESET . . . . . . . 20mA

Rate of Rise at V

CC

. . . . . . . . . . . . . . . . . . . . 100V/µs

Power Dissipation (T

A

= 70°C) . . . . . . . . . . 320mW

(Derate SOT-143 4mW/°C above 70

°C)

Operating Temperature Range . . . . . . . . . . – 40°C to 105°C

Storage Temperature Range . . . . . . . . . . . . . –65°C to 160°C

Lead Temperature (soldering, 10 sec) . . . . . 300°C

These are stress ratings only and functional operation is not implied.
Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability

Notes: 1. Tape and Reel packaging is indicated by the -T designation.

2. Devices may also be marked with full part number: 811L, 812M etc. XX refers to lot.

Absolute Maximum Ratings

IMP8

IMP81111

, IMP8

, IMP81122

©

1999 IMP, Inc. 408-432-9100/www.impweb.com 3

Parameter Symbol Conditions Min Typ Max Units

Input Voltage (VCC) Range V

CC

TA= 0°C to 70°C 1.1 5.5 V
TA= –40°C to 105°C 1.2 5.5

Supply Current (Unloaded) I

CC

TA= –40°C to 85°C V

CC

< 5.5V, L/M/J 6 15 µA

T

A

= –40°C to 85°C V

CC

< 3.6V, R/S/T 5 10

T

A

= 85°C to 105°C V

CC

< 5.5V, L/M/J 25

TA= 85°C to 105°C V

CC

< 3.6V, R/S/T 20

Reset Threshold V

TH

L devices

T

A

= 25°C 4.56 4.63 4.70 V

T

A

= –40°C to 85°C 4.50 4.75

T

A

= 85°C to 105°C 4.40 4.86

M devices

T

A

= 25°C 4.31 4.38 4.45

T

A

= –40°C to 85°C 4.25 4.50

T

A

= 85°C to 105°C 4.16 4.56

J devices

T

A

= 25°C 3.93 4.00 4.06

T

A

= –40°C to 85°C 3.89 4.10

T

A

= 85°C to 105°C 3.80 4.20

T devices

T

A

= 25°C 3.04 3.08 3.11

T

A

= –40°C to 85°C 3.00 3.15

T

A

= 85°C to 105°C 2.92 3.23

S devices

T

A

= 25°C 2.89 2.93 2.96

T

A

= –40°C to 85°C 2.85 3.00

T

A

= 85°C to 105°C 2.78 3.08

R devices

T

A

= 25°C 2.59 2.63 2.66

T

A

= –40°C to 85°C 2.55 2.70

T

A

= 85°C to 105°C 2.50 2.76

Reset Threshold Temp. Coefficient TC

VTH

30 ppm/°C

VCCto Reset Delay VCC= VTHto (VTH- 125mV), L/M/J devices 40 µs

VCC= VTHto (VTH- 125mV), R/S/T devices 20

Reset Active Timeout Period TA= 0°C to 70°C 140 560 ms

TA= –40°C to 105°C 100 840

MR Minimum Pulse Width t

MR

10 µs
MR Glitch Immunity Note 3 100 ns
MR to RESET Propagation Delay t

MD

Note 2 0.5 µs

MR Input Threshold V

IH

VCC> V

TH (MAX)

, IMP811/812L/M/J 2.3 V

V

IL

0.8

V

IH

VCC> V

TH (MAX)

, IMP811/812R/S/T 0.7V

CC

V

IL

0.25V

CC

MR Pull-up Resistance 10 20 30 kΩ
Low RESET Output Voltage (IMP811) V

OL

V

CC

= VTHmin., I

SINK

= 1.2mA, IMP811R/S/T 0.3 V

V

CC

= VTHmin., I

SINK

= 3.2mA, IMP811L/M/J 0.4

VCC> 1.1V, I

SINK

= 50µA 0.3

High RESET Output Voltage (IMP811) V

OH

VCC> VTHmax., I

SOURCE

= 500µA, IMP811R/S/T 0.8V

CC

V

VCC> VTHmax., I

SOURCE

= 800µA, IMP811L/M/J V

CC

-1.5

Low RESET Output Voltage (IMP812) V

OL

VCC= VTHmax., I

SINK

= 1.2mA, IMP812R/S/T 0.3 V

VCC= VTHmax., I

SINK

= 3.2mA, IMP812L/M/J 0.4

High RESET Output Voltage (IMP812) V

OH

1.8V < VCC< VTHmin., I

SOURCE

= 150µA 0.8V

CC

V

Electrical Characteristics

Unless otherwise noted VCCis over the full voltage range, TA= –40°C to 105°C.
Typical values at T

A

= 25°C, VCC= 5V for L/M/J devices, VCC= 3.3V for T/S devices and VCC= 3V for R devices.

Notes: 1. Production testing done at TA= 25°C. Over temperature specifications guaranteed by design only using six sigma design limits.

2. RESET output is active LOW for the IMP811 and RESET output is active HIGH for the IMP812.

3. Glitches of 100ns or less typically will not generate a reset pulse.