ON Semiconductor MAX707, MAX708 User Manual

MAX707, MAX708

mP Supervisory Circuits

The MAX707/708 are cost−effective system supervisor circuits designed to monitor V to the host processor when necessary. No external components are required.

The reset output is driven active within 20 msec of VCC falling through the reset voltage threshold. Reset is maintained with 200 mS of delay time after VCC rise above the reset threshold. The MAX707/708 have a low quiescent current of 12 mA at VCC = 3.3 V, an active−high RESET and active−low RESET with a push−pull output. The output is guaranteed valid down to VCC = 1.0 V. The MAX707/708 have a Manual Reset MR input and a +1.25 V threshold detector for power−fail input PFI. These devices are available in a Micro8 and SOIC−8 package.

Features

• Precision Supply−Voltage Monitor

MAX707: 4.63 V Reset Threshold Voltage MAX708: Standard Reset Threshold Voltages (Typical):

4.38 V, 3.08 V, 2.93 V, 2.63 V

• Reset Threshold Available from 1.6 V to 4.9 V with 100 mV

Increments (Factory Option)

• 200 mS (Typ) Reset Timeout Delay

• 12 mA (V

= 3.3 V) Quiescent Current

CC

• Active_High and Active_Low Reset Output

• Guaranteed RESET_L and RESET Output Valid to V

• Voltage Monitor for Power−Fail or Low−Battery Warning

• 8 Pin SOIC or Micro8 Package

• Pb−Free Packages are Available

in digital systems and provide a reset signal

CC

= 1.0 V

CC

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8

1

xxx = Specific Device Code A = Assembly Location Y = Year W = Week G = Pb−Free Package

8

1

xxxxx = Specific Device Code AL = Assembly Lot Code Y = Year W = Week G = Pb−Free Package (Note: Microdot may be in either location)

Micro8t

CUA SUFFIX

CASE 846A

SOIC−8

ESA SUFFIX

CASE 751

PIN CONFIGURATION

MARKING

DIAGRAMS

8

xxx

AYW

G

1

8

xxxxx

ALYWG

G

1

Applications

• Computers

• Embedded System

• Battery Powered Equipment

• Critical mP Power Supply Monitor

August, 2005 − Rev. 4

Micro8

RESET RESET

MR

V

CC

1 2 3 4

(Top View)

NC

8

PFO

7

PFI

6

GND

5

SOIC−8

MR

V

CC

GND

PFI

1 2 3 4

(Top View)

8 7 6 5

RESET RESET NC PFO

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.

1 Publication Order Number:

MAX707/D

MR

T

R

qJA

MAX707, MAX708

V

CC

RESET

GENERATOR

V

CC

+

RESET

−

V

TH

PFI

+

−

PFO

1.25 V

GND

Figure 1. Representative Block Diagram

MAXIMUM RATINGS (Note 1)

Rating Symbol Value Unit

Supply Voltage V Output Voltage V Output Current (All Outputs) I Input Current (VCC and GND) I Thermal Resistance Junction−to−Air

CC out

out

in

R

q

JA

Micro8

SOIC−8 Operating Ambient Temperature T Storage Temperature Range T LatchUp Performance

A

stg

I

LATCHUP

Positive

Negative

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.

1. This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL−STD−883, Method 3015. Machine Model Method 200 V.

2. The maximum package power dissipation limit must not be exceeded.

*

J(max)

P

+

D

A

with T

J(max)

= 150°C

6.0 V

−0.3 to (VCC + 0.3) V 20 mA 20 mA

°C/W 248 187

−40 to +85 °C

−40 to +125 °C mA

300 280

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MAX707, MAX708

ELECTRICAL CHARACTERISTICS (V

= 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values

CC

are at TA = 25°C, VCC = 3.3 V.)

Characteristics Symbol Min Typ Max Unit

Operating Voltage Range V Supply Current

VCC = 3.3 V VCC = 5.5 V

Reset Threshold

CC

I

CC

V

TH

1.0 − 5.5 V

−

12 16

22 28

MAX707

TA = +25°C TA = −40°C to +85°C

4.56

4.50

4.63

4.70

4.75

MAX708

TA = +25°C TA = −40°C to +85°C

4.31

4.25

4.38

4.45

4.50

MAX708T

TA = +25°C TA = −40°C to +85°C

3.03

3.00

3.08

3.13

3.15

MAX708S

TA = +25°C TA = −40°C to +85°C

2.89

2.85

2.93

2.97

3.00

MAX708R

TA = +25°C

TA = −40°C to +85°C Reset Threshold Hysteresis V VCC Falling Reset Delay (VCC = VTH + 0.2 V to VTH − 0.2 V) t Reset Active Timeout Period t RESET_L, RESET_H Output Low Voltage

VCC w 1.0 V, Iol = 100 mA VCC u 2.7 V, Iol = 1.2 mA VCC u 4.5 V, Iol = 3.2 mA

RESET_L, RESET_H Output High Voltage

VCC w 1.0 V, Ioh = 50 mA VCC u 2.7 V, Ioh = 500 mA

VCC u 4.5 V, Ioh = 800 mA MR_L Pull−up Resistance R MR_L Pulse Width (VTH (max) t VCC t 5.5 V) t

HYS PD RP

V

MRI MR

ol

oh

2.59

2.55

− 0.01 V

2.63

TH

2.67

2.70

− mV

− 20 −

140 200 330 mS

0.8 V

−

CC CC CC

−

0.3

−

50 − −

1.0 − − MR_L Glitch Rejection (VTH (max) t VCC t 5.5 V) − − 0.1 − MR_L High_level Input Threshold (VTH (max) t VCC t 5.5 V) V MR_L Low_level Input Threshold (VTH (max) t VCC t 5.5 V) V MR_L to RESET_L and RESET_H Output Delay

IH

IL

t

MD

0.7 V

CC

− − V

− − 0.3 V

− 0.2 −

CC

(VTH (max) t VCC t 5.5 V) PFI Input Threshold (VCC = 3.3 V, PFI Falling) − 1.20 1.25 1.3 V PFI Input Current − −250 0.01 250 nA PFI to PFO Delay (VCC = 3.3 V, V PFO_L Output Low Voltage

VCC = 2.7 V, Iol = 1.2 mA

VCC = 4.5 V, Iol = 3.2 mA PFO_L Output High Voltage

VCC = 2.7 V, Ioh = 500 mA

VCC = 4.5 V, Ioh = 800 mA

OVERDRIVE

= 15 mV) − − 3.0 −

V

ol

V

oh

0.8 V

−

CC CC

−

0.3

−

mA

V

mS

V

KW

mS mS

V

mS

V

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3

MAX707, MAX708

Á

I

, OUTPUT SINK CURRENT (mA)

0

)

0

I

, OUTPUT SINK CURRENT (mA)

PIN DESCRIPTION (Pin No. with parentheses is for Micro8 package.)

Pin No. Symbol Description

1 (3)

ÁÁ

2 (4) 3 (5) 4 (6)

5 (7) 6 (8) 7 (1)

ÁÁ

8 (2)

MR

Á

V

CC

GND

PFI

PFO

NC

RESET

Á

RESET

Manual Reset Input. MR can be driven from TTL/CMOS logic or from a manual Reset switch. This input, when floating, is internally pulled up to VCC with 50 kW resistor.

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Supply Voltage: C = 100 nF is recommended as a bypass capacitor between VCC and GND. Ground Reference Power Fail Voltage Monitor Input. When PFI is less than 1.25 V, PFO goes low. Connect PFI to GND or VCC when

not used. Power Fail Monitor Output. When PFI is less than 1.25 V, it goes low and sinks current. Otherwise, it remains high. Non−connective Pin Active Low RESET can be triggered by VCC below the threshold level or by a low signal on MR. It remains low for

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200 ms (typ.) after VCC rises above the reset threshold. Active high RESET output the inverse of RESET one.

3.0 TA = 25°C

2.5

2.0

1.5

1.0

0.5

OUT

0

Figure 2. MAX707/708 Series 1.60 V Reset

12

10

OUT

Output Sink Current vs. Output Voltage

TA = 25°C

8

6

4

2

0

0.50

Vin = 1.0 V

0.5 V

, OUTPUT VOLTAGE (V)

out

1.0 1.5

Vin = 1.5 V

V

, OUTPUT VOLTAGE (V)

out

Vin = 1.5 V

Vin = 2.5 V

Vin = 2.0 V

2.01.0 1.5 2.5 3.0

20

TA = 25°C

18 16 14 12 10

8 6 4

, OUTPUT SOURCE CURRENT (mA

2

OUT

0

I

2.0

0

1.0 4.0

Figure 3. MAX707/708 Series 1.60 V Reset

Output Source Current vs. Input Voltage

20

TA = 25°C

18 16 14 12 10

8 6 4 2

, OUTPUT SOURCE CURRENT (mA)

out

I

0

0.0 1.0 6.

V

= Vin − 2.0 V

out

Vin − 1.5 V

2.0

3.0

Vin, INPUT VOLTAGE (V)

V

= Vin − 2.0 V

out

Vin −1.5 V

Vin − 1.0 V

Vin − 0.5 V

2.0 3.0 4.0 5.0

Vin, INPUT VOLTAGE (V)

Vin − 1.0 V

Vin − 0.5 V

5.0 6.

Figure 4. MAX707/708 Series 2.93 V Reset

Output Sink Current vs. Output Voltage

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Figure 5. MAX707/708 Series 2.93 V Reset

Output Source Current vs. Input Voltage