®
SP703/SP704
Low Power Microprocessor Supervisory
with Battery Switch-Over
s
Precision Voltage Monitor:
SP703 at 4.65V
SP704 at 4.40V
s
Reset Time Delay - 200ms
s
Debounced TTL/CMOS -
Compatible Manual - Reset Input
s
Minimum component count
s
60µA Maximum Operating Supply Current
s
0.6µA Maximum Battery Backup Current
s
0.1µA Maximum Battery Standby Current
s
Power Switching
250mA Output in V
CC
Mode (0.6Ω)
25mA Output in Battery Mode (5Ω)
s
Voltage Monitor for Power Fail or
Low Battery Warning
s
Available in 8 pin SO and DIP packages
s
RESET asserted down to V
CC
= 1V
s
Pin Compatible Upgrades to
MAX703/MAX704
Now available in Lead Free
DESCRIPTION
The
SP703/704
devices are microprocessor (µP) supervisory circuits that integrate a myriad
of components involved in discrete solutions to monitor power-supply and battery-control
functions in
µP
and digital systems. The series will significantly improve system reliability and
operational efficiency when compared to discrete solutions. The features of the
SP703/704
devices include a manual reset input, a
µP
reset and backup-battery switchover, and power-
failure warning. The series is ideal for applications in computers, controllers, intelligent
instruments and automotive systems. All designs where it is critical to monitor the power
supply to the
µP
and its related digital components will find the series to be an ideal solution.
V
BATT
BATTERY SWITCHOVER
CIRCUITRY
V
OUT
V
OUT
V
CC
GND
PFI
1
2
3
4
8
7
6
5
V
BATT
RESET
MR
PFO
V
CC
RESET
GENERATOR
1.25V
RESET
MR
PFI
PFO
1.25V
PINOUT
SP703/704DS/07
INTERNAL BLOCK DIAGRAM
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifica-
tions below is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods of time
may affect reliability and cause permanent damage to
the device.
V
CC
........................................................-0.3V to 6.0V
V
BATT
.....................................................-0.3V to 6.0V
All Other Inputs......................................-0.3V to (V
CC
+0.3V)
Input Current:
V
CC
.........................................................250mA
V
BATT
........................................................50mA
GND........................................................20mA
Output Current:
V
OUT
.....Short-Circuit Protected for up to 10sec
All Other Inputs.................................20mA
Rate of Rise, V
CC
,V
BATT
..................100V/µs
Continuous Power Dissipation.......500mW
Storage Temperature.......-65°C to +160°C
Lead Temperature(soldering,10sec).................+300°C
ESD Rating.............................4kV Human Body Model
SPECIFICATIONS
V
cc
=4.75v to 5.50V for SP703, V
CC
= 4.50V to 5.50V for SP704, V
BATT
=2.80V, T
A
=T
MIN
to T
MAX
, typical specified at 25
O
C, unless otherwise noted.
PARAMETERS
Operating Voltage Range,
MIN.
0
TYP.
MAX.
5.5
UNITS
Volts
CONDITIONS
V
CC
or V
BATT
, NOTE 1
Supply Current, I
SUPPLY
,
I
SUPPLY
in Battery Backup Mode,
V
CC
= 0V, V
BATT
= 2.8V
V
BATT
Standby Current, NOTE 2
V
OUT
Output
V
OUT
in Battery-Backup Mode
V
CC
< V
BATT
- 0.2V
Battery Switch Threshold,
V
CC
to V
BATT
Battery Switchover Hysteresis
Reset Threshold
4.50
4.25
-0.1
V
CC
- 0.1
V
BATT
-0.15
V
CC
- 0.03
V
CC
- 0.15
V
BATT
- 0.04
V
BATT
- 0.20
20
-20
40
4.65
4.40
4.75
4.50
35
0.001
60
0.6
0.02
µA
µA
µA
Volts
V
CC
> V
BATT
+ 0.2V
I
OUT
= 50mA
I
OUT
= 250mA
I
OUT
= 5mA
I
OUT
= 25mA
Power-up
Power-down
Peak to Peak
SP703
SP704
excluding I
OUT
Volts
mV
mV
Volts
SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
2
SPECIFICATIONS (continued)
V
cc
=4.75V to 5.50V for SP703, V
CC
= 4.5 0V to 5.50V for SP704, V
BATT
=2.80V, T
A
=T
MIN
to T
MAX
, typical specified at 25
O
C, unless otherwise noted.
PARAMETERS
Reset Threshold Hysteresis
Reset Pulse Width, t
RS
RESET Output Voltage
MIN.
TYP.
40
MAX.
UNITS
mV
CONDITIONS
Peak to Peak
140
V
CC
- 1.5
200
280
ms
I
SOURCE
= 800
µA
0.1
0.004
MR Input Threshold
LOW
HIGH
MR Minimum Pulse Width
MR to RESET Delay
MR Pull Up Current
PFI Input Threshold
PFI Input Current
PFO Output Voltage
100
1.200
-25
V
CC
- 1.5
0.1
250
1.250
0.01
0.4
0.3
Volts
I
SINK
= 3.2mA
I
SINK
= 50
µ
A, V
CC
= 1.0V
0.8
2.0
150
250
600
1.300
25
V
ns
ns
µA
Volts
nA
Volts
I
SOURCE
= 800
µA
I
SINK
= 3.2mA
MR=0V
0.4
NOTE 1:
Either V
CC
or V
BATT
can go to 0V if the other is greater than 2.0V.
NOTE 2:
"-" equals the battery-charging current, "+" equals the battery-discharging current.
SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
3
PINOUT
INTERNAL BLOCK DIAGRAM
V
BATT
BATTERY SWITCHOVER
CIRCUITRY
V
OUT
V
OUT
V
CC
GND
PFI
1
2
3
4
8
7
6
5
V
BATT
RESET
MR
PFO
MR
V
CC
RESET
GENERATOR
1.25V
RESET
PIN ASSIGNMENTS
Pin 1 —V
OUT
— Output Supply Voltage. V
OUT
connects to V
CC
when V
CC
is greater than
V
BATT
and V
CC
is above the reset thresh-
old. When V
CC
falls below V
BATT
and
V
CC
is below the reset threshold, V
OUT
connects to V
BATT
. Connect a 0.1µF ca-
pacitor from V
OUT
to GND.
Pin 2 — V
CC
— +5V Supply Input
Pin3 — GND — Ground reference for all signals
Pin 4 — PFI — Power-Fail Input. This is the
noninverting input to the power-fail com-
parator. When PFI is less than 1.25V,
PFO goes low. Connect PFI to GND or
V
OUT
when not used.
Pin 5 — PFO — Power-Fail Output.
Pin 6 — MR — Manual Reset Input. This input
generates a reset pulse when pulled below
0.8V. This active LOW input is TTL/
CMOS compatible and can be shorted to
ground with a switch. It has an internal
250µA (typical) pull-up current. Leave
this pin floating when not used.
Pin 7 — RESET (Active Low)– Reset Output.
RESET Output goes low whenever
V
CC
falls below the reset threshold or
whenever MR is pulled below 0.8V for
longer than 150nS. RESET remains low
for 200ms after V
CC
crosses the reset
threshold voltage on power-up or after
being triggered by MR.
PFI
PFO
1.25V
Pin 8 — V
BATT
— Backup-Battery Input. When
V
CC
falls below the reset threshold, V
BATT
will be switched to V
OUT
if V
BATT
is
20mV greater than V
CC
. When V
CC
rises
20mV above V
BATT
, V
OUT
will be recon-
nected to V
CC
. The 40mV hysteresis pre-
vents repeated switching if V
CC
falls
slowly.
SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
4
TYPICAL CHARACTERISTICS
(25
o
C, unless otherwise noted)
V
CC
Supply Current vs.
Temperature (Normal Mode)
51
47
43
39
35
31
27
23
19
-60 -30
Battery Supply Current vs.
Temperature (Backup Mode)
2.9
PFI Threshold
vs. Temperature
1.256
V
BATT
Current (µA)
V
CC
Current (µA)
2.4
1.9
1.4
0.9
0.4
PFI Threshold (V)
V
CC
=5V
V
BATT
=2.8V
V
CC
=0V
V
BATT
=2.8V
1.254
1.252
1.250
1.248
1.246
-60
-30
0
V
CC
=5V
V
BATT
=0
NO LOAD ON PFO
0
30
60
90
120 150
-0.1
-60 -40 -20 0 20 40 60 80 100 120 140
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
Temperature Deg. C
V
BATT
to V
OUT
ON
Resistance vs. Temperature
15
0.9
V
CC
to V
OUT
On
Resistance vs. Temperature
Resistance (ohms)
0.8
0.7
0.6
0.5
0.4
0.3
Reset Threshold
vs. Temperature
4.70
4.69
4.68
4.67
4.66
4.65
4.64
4.63
4.62
4.61
4.60
-60
Resistance (ohms)
10
V
BATT
=2.8V
5
V
BATT
=4.5V
0
-60
-30
0
30
60
90
120
150
-60
-30
0
30
60
90
120 150
Reset Threshold (V)
V
CC
=0V
V
BATT
=2V
V
CC
=5V
V
BATT
=0V
SP703
V
BATT
=0V
Power Down
-30
0
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
Temperature Deg. C
Reset Output Resistance
vs. Temperature
600
Reset Delay
vs. Temperature
212
Reset Delay (mS)
Resistance (ohms)
210
208
206
204
202
200
-60
V
BATT
Current(µA) Log Scale
V
CC
=5V,V
BATT
=2.8V
500
Soucing Current
400
300
200
100
0
-60
V
CC
=0V to 5V Step,
V
BATT
=2.8V
Battery Current vs. V
CC
Voltage
IE+2
IE+1
IE+0
IE-1
IE-2
IE-3
IE-4
IE-5
IE-6
IE-7
IE-8
.0000
V
BATT
=2.8V
V
CC
=0V,V
BATT
=2.8V
Sink Current
-30
0
30
60
90
120 150
-30
0
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
V
CC
(0.5V/div)
5.000
SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
5
