MICREL MIC705M, MIC705N, MIC706M, MIC706N, MIC707M Datasheet

1

The MIC705/MIC706/MIC707/MIC708 are inexpensive
microprocessor supervisory circuits that monitor power
supplies in microprocessor based systems. The circuit
functions include a watchdog timer, microprocessor
reset, power failure warning and a debounced manual
reset input.

The MIC705 and MIC706 offer a watchdog timer
function while the MIC707 and MIC708 have an active
high reset output in addition to the active low reset
output.

Supply voltage monitor levels of 4.65V and 4.4V are
available. The MIC705/MIC707 have a nominal reset
threshold level of 4.65V while the MIC706 and MIC708
have a 4.4V nominal reset threshold level. When the
supply voltage drops below the respective reset
threshold level, RESET is asserted.

1

2

3

4

V

CC

GND

PFI

8

7

6

5

WDO

RESET

WDI

PFO

MIC705
MIC706

MR

PFO

1

2

3

4

V

CC

GND

PFI

8

7

6

5

RESET

RESET

NC

PFO

MIC707
MIC708

MR

PFO

Top View

N Package - 8 Lead Plastic DIP Package
M Package - 8 Lead Plastic SOIC Package

Part Package Temp. Range

MIC70_N 8-Lead PDIP -40°C to +85°C

MIC70_M 8-Lead SOIC -40°C to +85°C

·

Automotive Systems

·

Intelligent Instruments

·

Critical Microprocessor Power Monitoring

·

Printers

·

Computers

·

Controllers

·

Debounced Manual Reset Input is
TTL/CMOS Compatible

·

Reset Pulse Width, 200ms

·

Watchdog Timer, 1.6s (MIC705/MIC706)

·

4.4V or 4.65V Precision Voltage Monitor

·

Early Power Fail Warning or Low Battery

Detect

V

CC

RESET

µP

RESET

V

CC

MIC705
MIC706

+5V (Regulated)

MR

WDI

I/O Line

PFO InterruptPFI

DC Voltage

(Unregulated)

Manual

Reset

WDO

NMI

Typical Operating Circuit

Features

Description Pin Configuration

Ordering Information

Typical Applications

MIC705/6/7/8 µP Supervisory Circuits

MIC705/6/7/8

µP Supervisory Circuits

MIC705/6/7/8 µP Supervisory Circuits

2

Electrical Characteristics

VCC= 4.75V to 5.5V for MIC705/MIC707, VCC= 4.5V to 5.5V for MIC706/MIC708, TA= -40°C to 85°C unless otherwise noted.

Parameter Conditions Min Typ Max Units

Operating Voltage Range, V

CC

MIC70-- 1.4 5.5 V

Supply Current MIC70-- 60 µA

Reset Voltage Threshold MIC705, MIC707 4.50 4.65 4.75 V

MIC706, MIC708 4.25 4.4 4.5

Reset Threshold Hysteresis 40 mV

Reset Pulse Width, t

RS

140 200 280 ms

RESET Output Voltage I

Source

= 800µA

VCC- 1.5V

V

I

Sink

= 3.2mA 0.4

MIC70--C, I

Sink

= 50µA, V

CC

= 1.4V 0.3

RESET Output Voltage I

Source

= 800µA

VCC- 1.5V

V

I

Sink

= 1.2mA 0.4

Watchdog Timeout Period, t

WD

1.0 1.6 2.25 sec

WDI Minimum Input Pulse, t

WP

VIL= 0.4V, VIH= 80% of V

CC

50 ns

WDI Threshold Voltage V

IH, VCC

= 5V

3.5

V

V

IL, VCC

= 5V 0.8

WDI Input Current WDI = 0V -150 -50 µA

WDI = V

CC

50 150

WDO Output Voltage I

Source

= 800µA

VCC- 1.5V

V

I

Sink

= 1.2mA 0.4

Absolute Maximum Ratings

Terminal Voltage

VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V

All Other Inputs . . . . . . . . . . . . -0.3V to (VCC+ 0.3V)

Input Current

V

CC,

Gnd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA

Output Current (all outputs) . . . . . . . . . . . . . . . . . 20mA

Operating Temperature Range

MIC70_N, MIC70_M . . . . . . . . . . . . . . . . . -40°C to 85°C

Storage Temperature Range . . . . . . . . . . . . .-65°C to 150°C

Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300°C

Power Dissipation (PDIP) . . . . . . . . . . . . . . . . . . . . 475mW

Power Dissipation (SOIC) . . . . . . . . . . . . . . . . . . . . 400mW

Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute
maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.

MIC705/6/7/8 µP Supervisory Circuits

3

Electrical Characteristics

VCC= 4.75V to 5.5V for MIC705/MIC707, VCC= 4.5V to 5.5V for MIC706/MIC708, TA= -40°C to 85°C unless otherwise noted.

Parameter Conditions Min Typ Max Units

MR Pull-Up Current MR = 0V 100 250 600 µA

MR Pulse Width, t

MR

150 nS

MR Input Threshold V

IL

0.8 V

V

IH

2.0

MR to Reset Output Delay, t

MD

250 nS

PFI Input Threshold VCC= 5V 1.2

1.25

1.3 V

PFI Input Current

-25

0.01 +25 nA

PFO Output Voltage I

Sink

= 3.2mA 0.4 V

VCC= 5V, I

Source

= 800µA

VCC- 1.5V