MICREL MIC706SN, MIC706PN, MIC708TM, MIC708RM, MIC706RN Datasheet

1

The MIC706P/R/S/T and MIC708R/S/T are inexpensive
microprocessor supervisory circuits that monitor power
supplies in 3.0 and 3.3 Volt microprocessor based
systems. The circuit functions include a watchdog timer,
microprocessor reset, power failure warning and a
debounced manual reset input.

The MIC706 offers a watchdog timer function, while the
MIC708 has no watchdog timer but has an active high
reset output in addition to the active low reset output.

The R, S, and T versions are similar in all respects
except for supply voltage reset threshold levels. The
threshold levels are 2.63, 2.93, and 3.08V respectively.
When the supply voltage drops below the reset
threshold level, RESET (and RESET for the MIC708) is
asserted.

The MIC706P is identical to the MIC706R, except that
the Reset output is asserted high.

1

2

3

4

V

CC

GND

PFI

8

7

6

5

WDO
RESET

WDI

PFO

MIC706

MR

PFO

1

2

3

4

V

CC

GND

PFI

8

7

6

5

RESET

RESET

NC

PFO

MIC708

MR

PFO

(RESET for MIC706P)

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

·

Laptop Computers

·

Intelligent Instruments

·

Critical Microprocessor Power Monitoring

·

Printers

·

Computers

·

Controllers

·

30µA Maximum Supply Current

·

Debounced Manual Reset Input is
TTL/CMOS Compatible

·

Reset Pulse Width, 200ms

·

Watchdog Timer, 1.6s (MIC706)

·

Precision Supply Voltage Monitor

·

Early Power Fail Warning or Low Battery

Detect

V

CC

RESET

µP

RESET

V

CC

MIC706

+3.0 or +3.3V (Regulated)

MR

WDI

I/O Line

PFO

Interrupt

PFI

DC Voltage

(Unregulated)

Manual

Reset

WDO

NMI

Typical Operating Circuit

Features

Description Pin Configuration

Ordering Information

Typical Applications

MIC706P/R/S/T, MIC708R/S/T µP Supervisory Circuits

MIC706P/R/S/T, MIC708R/S/T

µP Supervisory Circuits

MIC706P/R/S/T, MIC708R/S/T µP Supervisory Circuits

2

Electrical Characteristics

VCC= 2.70V to 5.5V for MIC70_P/R, VCC= 3.00V to 5.5V for MIC70_S, VCC= 3.15V to 5.5V for MIC70_T, TA= -40°C to 85°C
unless otherwise noted.

Parameter Conditions Min Typ Max Units

Operating Voltage Range, V

CC

1.4 5.5 V

Supply Current 30 µA

Reset Voltage Threshold MIC70_P/R 2.55 2.63 2.70 V

MIC70_S 2.85 2.93 3.00
MIC70_T 3.00 3.08 3.15

Reset Threshold Hysteresis 20 mV

Reset Pulse Width, t

RS

140 200 280 ms

RESET Output Voltage I

Source

= 200µA 0.8 x

V

CC

V

(MIC70_R/S/T) I

Sink

= 1.2mA 0.3

I

Sink

= 50µA, V

CC

= 1.4V 0.3

RESET Output Voltage I

Source

= 200µA 0.8 x

V

CC

V

(MIC706P) I

Sink

= 1.2mA 0.3

RESET Output Voltage I

Source

= 200µA 0.8 x

V

CC

V

(MIC708R/S/T) I

Sink

= 500µA 0.3

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

100 ns

VIL= 0.4V, VIH= 80% of VCC>4.5V 50 ns

WDI Threshold Voltage V

IH

0.7 x V

CC

V

V

IL

0.6

WDI Input Current WDI = 0V or V

CC

-1 1 µA

WDO Output Voltage I

Source

= 200µA 0.8 x

V

CC

V

I

Sink

= 500µA 0.3

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.

MIC706P/R/S/T, MIC708R/S/T µP Supervisory Circuits

3

Electrical Characteristics

VCC= 2.70V to 5.5V for MIC70_P/R, VCC= 3.00V to 5.5V for MIC70_S, VCC= 3.15V to 5.5V for MIC70_T, TA= -40°C to 85°C
unless otherwise noted.

Parameter Conditions Min Typ Max Units

MR Pull-Up Current MR = 0V 20 250 600 µA

MR Pulse Width, t

MR

500 nS

VCC> 4.5V 150 nS

MR Input Threshold V

IL

0.6 V

V

IH

0.7 x

V

CC

MR to Reset Output Delay, t

MD

750 nS

PFI Input Threshold 1.2

1.25

1.3 V

PFI Input Current

-25

0.01 +25 nA

PFO Output Voltage I

Sink

= 1.2mA 0.3 V

I

Source

= 200µA 0.8 x

V

CC