MAX707, MAX708
mP
Supervisory Circuits
The MAX707/708 are cost−effective system supervisor circuits
designed to monitor V
CC
in digital systems and provide a reset signal
to the host processor when necessary. No external components are
required.
The reset output is driven active within 20
msec
of V
CC
falling
through the reset voltage threshold. Reset is maintained with 200 mS
of delay time after V
CC
rise above the reset threshold. The
MAX707/708 have a low quiescent current of 12
mA
at V
CC
= 3.3 V,
an active−high RESET and active−low RESET with a push−pull
output. The output is guaranteed valid down to V
CC
= 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
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MARKING
DIAGRAMS
8
8
Micro8t
CUA SUFFIX
CASE 846A
1
xxx
A
Y
W
G
= Specific Device Code
= Assembly Location
= Year
= Week
= Pb−Free Package
8
8
1
SOIC−8
ESA SUFFIX
CASE 751
1
xxxxx
ALYWG
G
1
xxx
AYW
G
•
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
CC
= 3.3 V) Quiescent Current
Active_High and Active_Low Reset Output
Guaranteed RESET_L and RESET Output Valid to V
CC
= 1.0 V
Voltage Monitor for Power−Fail or Low−Battery Warning
8 Pin SOIC or Micro8 Package
Pb−Free Packages are Available
•
•
•
•
•
•
•
•
•
•
•
•
xxxxx = Specific Device Code
AL
= Assembly Lot Code
Y
= Year
W
= Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONFIGURATION
Micro8
RESET 1
RESET 2
MR 3
V
CC
4
(Top View)
8 NC
7 PFO
6 PFI
5 GND
Applications
Computers
Embedded System
Battery Powered Equipment
Critical
mP
Power Supply Monitor
SOIC−8
MR 1
V
CC
2
GND 3
PFI 4
(Top View)
8 RESET
7 RESET
6 NC
5 PFO
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
©
Semiconductor Components Industries, LLC, 2005
1
August, 2005 − Rev. 4
Publication Order Number:
MAX707/D
MAX707, MAX708
V
CC
RESET
MR
RESET
GENERATOR
V
CC
+
−
V
TH
PFI
+
−
1.25 V
PFO
RESET
GND
Figure 1. Representative Block Diagram
MAXIMUM RATINGS
(Note 1)
Rating
Supply Voltage
Output Voltage
Output Current (All Outputs)
Input Current (V
CC
and GND)
Thermal Resistance Junction−to−Air
Micro8
SOIC−8
Operating Ambient Temperature
Storage Temperature Range
LatchUp Performance
Positive
Negative
T
A
T
stg
I
LATCHUP
300
280
Symbol
V
CC
V
out
I
out
I
in
R
qJA
248
187
−40 to +85
−40 to +125
°C
°C
mA
Value
6.0
−0.3 to (V
CC
+ 0.3)
20
20
Unit
V
V
mA
mA
°C/W
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.
TJ(max)
*
TA
with T
J(max)
= 150°C
PD
+
R
qJA
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2
MAX707, MAX708
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.0 V to 5.5 V, T
A
= −40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= 25°C, V
CC
= 3.3 V.)
Characteristics
Operating Voltage Range
Supply Current
V
CC
= 3.3 V
V
CC
= 5.5 V
Reset Threshold
MAX707
T
A
= +25°C
T
A
= −40°C to +85°C
MAX708
T
A
= +25°C
T
A
= −40°C to +85°C
MAX708T
T
A
= +25°C
T
A
= −40°C to +85°C
MAX708S
T
A
= +25°C
T
A
= −40°C to +85°C
MAX708R
T
A
= +25°C
T
A
= −40°C to +85°C
Reset Threshold Hysteresis
V
CC
Falling Reset Delay (V
CC
= V
TH
+ 0.2 V to V
TH
− 0.2 V)
Reset Active Timeout Period
RESET_L, RESET_H Output Low Voltage
V
CC
w
1.0 V, I
ol
= 100
mA
V
CC
u
2.7 V, I
ol
= 1.2 mA
V
CC
u
4.5 V, I
ol
= 3.2 mA
RESET_L, RESET_H Output High Voltage
V
CC
w
1.0 V, I
oh
= 50
mA
V
CC
u
2.7 V, I
oh
= 500
mA
V
CC
u
4.5 V, I
oh
= 800
mA
MR_L Pull−up Resistance
MR_L Pulse Width (V
TH
(max)
t
V
CC
t
5.5 V)
MR_L Glitch Rejection (V
TH
(max)
t
V
CC
t
5.5 V)
MR_L High_level Input Threshold (V
TH
(max)
t
V
CC
t
5.5 V)
MR_L Low_level Input Threshold (V
TH
(max)
t
V
CC
t
5.5 V)
MR_L to RESET_L and RESET_H Output Delay
(V
TH
(max)
t
V
CC
t
5.5 V)
PFI Input Threshold (V
CC
= 3.3 V, PFI Falling)
PFI Input Current
PFI to PFO Delay (V
CC
= 3.3 V, V
OVERDRIVE
= 15 mV)
PFO_L Output Low Voltage
V
CC
= 2.7 V, I
ol
= 1.2 mA
V
CC
= 4.5 V, I
ol
= 3.2 mA
PFO_L Output High Voltage
V
CC
= 2.7 V, I
oh
= 500
mA
V
CC
= 4.5 V, I
oh
= 800
mA
Symbol
V
CC
I
CC
−
−
V
TH
4.56
4.50
4.31
4.25
3.03
3.00
2.89
2.85
2.59
2.55
V
HYS
t
PD
t
RP
V
ol
−
−
−
V
oh
0.8 V
CC
0.8 V
CC
0.8 V
CC
R
MRI
t
MR
−
V
IH
V
IL
t
MD
−
−
−
V
ol
−
−
V
oh
0.8 V
CC
0.8 V
CC
−
−
−
−
−
−
0.3
0.3
V
50
1.0
−
0.7 V
CC
−
−
1.20
−250
−
−
−
−
−
−
0.1
−
−
0.2
1.25
0.01
3.0
−
−
−
−
−
−
−
0.3 V
CC
−
1.3
250
−
KW
mS
mS
V
V
mS
V
nA
mS
V
−
−
−
0.3
0.3
0.3
V
−
−
140
4.63
4.70
4.75
4.45
4.50
3.13
3.15
2.97
3.00
2.67
2.70
−
−
330
mV
mS
mS
V
12
16
22
28
V
Min
1.0
Typ
−
Max
5.5
Unit
V
mA
4.38
3.08
2.93
2.63
0.01 V
TH
20
200
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3
MAX707, MAX708
PIN DESCRIPTION
(Pin No. with parentheses is for Micro8 package.)
I
OUT
, OUTPUT SINK CURRENT (mA)
3.0
T
A
= 25°C
2.5
2.0
1.5
1.0
0.5
0
0
0.5
1.0
1.5
2.0
V
out
, OUTPUT VOLTAGE (V)
V
in
= 1.0 V
V
in
= 1.5 V
I
OUT
, OUTPUT SOURCE CURRENT (mA)
I
out
, OUTPUT SOURCE CURRENT (mA)
I
OUT
, OUTPUT SINK CURRENT (mA)
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ÁÁÁÁÁ
1 (3)
2 (4)
3 (5)
4 (6)
5 (7)
6 (8)
MR
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 V
CC
with 50 kW resistor.
Supply Voltage: C = 100 nF is recommended as a bypass capacitor between V
CC
and GND.
Ground Reference
V
CC
GND
PFI
Power Fail Voltage Monitor Input. When PFI is less than 1.25 V, PFO goes low. Connect PFI to GND or V
CC
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
PFO
NC
7 (1)
8 (2)
RESET
RESET
Active Low RESET can be triggered by V
CC
below the threshold level or by a low signal on MR. It remains low for
200 ms (typ.) after V
CC
rises above the reset threshold.
Active high RESET output the inverse of RESET one.
20
18
16
14
12
10
8
6
4
2
0
0
1.0
2.0
3.0
4.0
5.0
6.0
V
in
, INPUT VOLTAGE (V)
V
in
− 0.5 V
V
in
− 1.0 V
V
in
− 1.5 V
T
A
= 25°C
V
out
= V
in
− 2.0 V
Pin No.
Symbol
Description
Figure 2. MAX707/708 Series 1.60 V Reset
Output Sink Current vs. Output Voltage
Figure 3. MAX707/708 Series 1.60 V Reset
Output Source Current vs. Input Voltage
12
T
A
= 25°C
10
8
V
in
= 2.0 V
6
4
2
0
0
0.5
1.0
1.5
2.0
2.5
3.0
V
out
, OUTPUT VOLTAGE (V)
V
in
= 2.5 V
20
18
16
14
12
10
8
6
4
2
0
0.0
1.0
2.0
3.0
4.0
V
in
− 0.5 V
5.0
6.0
V
in
− 1.0 V
V
in
−1.5 V
T
A
= 25°C
V
out
= V
in
− 2.0 V
V
in
= 1.5 V
V
in
, INPUT VOLTAGE (V)
Figure 4. MAX707/708 Series 2.93 V Reset
Output Sink Current vs. Output Voltage
Figure 5. MAX707/708 Series 2.93 V Reset
Output Source Current vs. Input Voltage
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4
MAX707, MAX708
V
in
= 4.0 V
I
out
, OUTPUT SOURCE CURRENT (mA)
30
I
out
, OUTPUT SINK CURRENT (mA)
T
A
= 25°C
25
20
V
in
= 3.0 V
15
10
V
in
= 2.0 V
5
0
0.0
20
18
16
14
12
10
8
6
4
2
0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
V
in
− 0.5 V
V
in
− 1.0 V
V
in
− 1.5 V
T
A
= 25°C
V
out
= V
in
− 2.0 V
1.0
2.0
3.0
4.0
5.0
V
out
, OUTPUT VOLTAGE (V)
V
in
, INPUT VOLTAGE (V)
Figure 6. MAX707/708 Series 4.90 V Reset
Output Sink Current vs. Output Voltage
V
DET
, DETECTOR THRESHOLD VOLTAGE (VOLTS)
V
DET
, DETECTOR THRESHOLD VOLTAGE (VOLTS)
1625
V
DET+
3120
3110
3100
3090
3080
3070
3060
−50
Figure 7. MAX707/708 Series 4.90 V Reset
Output Source Current vs. Input Voltage
1620
1615
1610
1605
V
DET+
1600
1595
1590
1585
−50
−25
0
25
50
75
100
V
DET−
V
DET−
−25
0
25
50
75
100
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 8. MAX707/708 Series 1.60 V Detector
Threshold Voltage vs. Temperature
V
DET
, DETECTOR THRESHOLD VOLTAGE (VOLTS)
T
PD
, V
CC
, FALLING RESET DELAY (ms)
5020
V
DET+
45
40
35
30
25
20
15
10
5
Figure 10. MAX707/708 Series 2.93 V Detector
Threshold Voltage vs. Temperature
5000
4980
4960
4940
V
TH
= 4.90 V
V
TH
= 2.93 V
V
TH
= 1.60 V
4920
4900
4880
−50
V
DET−
−25
0
25
50
75
100
0
−40
−20
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 9. MAX707/708 Series 4.90 V Detector
Threshold Voltage vs. Temperature
Figure 11. MAX707/708 Series V
CC
Falling
Reset Delay vs. Temperature
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