- Power-on reset generator with fixed delay time of
200ms (AP1705/6/7)
- Manual reset input (AP1705/7)
- Reset output available in active-Low (AP1705/6/7),
active-high (AP1706/7)
- Supply voltage supervision range 2.5V, 3V, 3.3V,
5V
- Watchdog timer (AP1705/6/7)
- Supply current of 25µA (Typ.)
- SOT23-5, SOT23-6 ,TSOT23-5 and TSOT23-6
Pb-Free
Package
- Temperature range: -40°C to 85°C
General Description
The AP1705/6/7 family of supervisors provides circuit
initialization and timing supervision, primarily for DSP
and processor-based systems.
During power-on,
RESET
is asserted when supply
voltage V
CC
becomes higher than 1.1V. Thereafter, the
supply voltage supervisor monitors V
CC
and keeps
Applications
- Applications Using DSPs, Microcontrollers, or
Microprocessors
- Industrial Equipment
- Programmable Controls
- Automotive Systems
- Portable/Battery-Powered Equipment
- Intelligent Instruments
- Wireless Communications Systems
- Notebook/Desktop Computers
RESET
active as long as V
CC
remains below the
threshold voltage V
IT-
. An internal timer delays the return
of the output to the inactive state (high) to ensure proper
system reset. The delay time ,t
d
, starts after V
CC
has
risen above the threshold voltage V
IT-
. When the supply
voltage drops below the threshold voltage V
IT-
, the
output becomes active (low) again. No external
components are required. All the devices of this family
have a fixed-sense threshold voltage V
IT-
set by an
internal voltage divider.
The AP1705/7 devices incorporate a manual reset input,
MR
. A low level at
MR
causes
RESET
to become
active. The AP1706/7 devices include a high-level
output RESET. AP1705/6/7 have a watchdog timer that
is periodically triggered by a positive or negative
transition at WDI. When the supervising system fails to
retrigger the watchdog circuit within the time-out interval,
ttout,
RESET
becomes active for the time period td.
This event also reinitializes the watchdog timer. Leaving
WDI unconnected disables the watchdog.
In applications where the input to the WDI pin may be
active (transitioning high and low) when the AP1705/6/7
asserting
RESET
, the AP1705/6/7 does not return to a
non-reset state when the input voltage is above Vt. If
the application requires that input to WDI is active when
Ordering Information
AP170X X X
Part No.
5: AP1705
6: AP1706
7: AP1707
Voltage
A: 4.63
B: 4.38
C: 4.00
D: 3.08
E: 2.93
F: 2.63
G: 2.25
Package
W5:SOT23-5
W6:SOT23-6
TW5:TSOT23-5
TW6:TSOT23-6
RESET
is asserted, WDI must be decoupled from the
active signal. This can be accomplished by using an
N-channel FET in series with the WDI pin, with the gate
of the FET connected to the
RESET
output as shown
in Figure 1.
AP1706
WDI
WDI External
RESET
Figure 1.
The product spectrum is designed for supply voltage of
2.5V, 3V, 3.3V and 5V. The circuits are available in a
SOT23-5L, SOT23-6L, and TSOT23-5L,TSOT23-6L
packages. The AP1705/6/7 devices are characterized
for operation over a temperature range of -40
o
C to 85
o
C.
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this
product. No rights under any patent accompany the sale of the product.
Rev. 1.0
1/13
Nov. 17, 2005
AP1705/6/7
Processor Supervisory Circuits
Pin Assignments
(Top View)
RESET
1
AP1705
4 WDI
5 V
CC
RESET 1
GND 2
RESET 3
AP1706
4 WDI
(Top View)
5 V
CC
GND 2
MR
3
SOT23-5/TSOT23-5
(Top View)
RESET 1
GND 2
RESET 3
AP1707
6 V
CC
5 WDI
4 MR
SOT23-5/TSOT23-5
SOT23-6/TSOT23-6
Pin Descriptions
Name
GND
RESET
(RESET)
V
CC
WDI
Description
Ground
Reset output pin
Operating voltage input
Watchdog input
Manual reset
MR
Absolute Maximum Ratings
(Over operating free-air temperature range, unless otherwise noted)*
Symbol
V
CC
Parameter
Supply Voltage (see note 1)
I
OL
I
OH
I
IK
I
OK
P
D
T
A
T
STG
T
RESET, RESET ,
MR
, WDI (see note 1)
Maximum Low Output Current
Maximum High Output Current
Input Clamp Current Range(V
I
< 0 or V
I
> V
CC
)
Output Clamp Current Range(V
O
< 0 or V
O
> V
CC
)
Operating Factor Above
T
A
= 25
o
C
Continuous Total Power
T
A
< 25
o
C Power Rating
Dissipation
T
A
= 70
o
C Power Rating
T
A
= 85
o
C Power Rating
Operating Free-air Temperature Range
Storage Temperature Range
Soldering Temperature
Rating
6.5
-0.3 to (V
CC
+0.3)
5
-5
±10
±10
Unit
V
V
mA
mA
mA
mA
3.5
437
280
227
-40 to 85
-65 to 150
260
mW/°C
mW
mW
mW
°C
°C
°C
*
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating
conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Note 1:
All voltage values are with respect to GND.
Anachip Corp.
www.anachip.com.tw
2/13
Rev. 1.0 Nov. 17, 2005
AP1705/6/7
Processor Supervisory Circuits
Recommended Operating Conditions
Symbol
V
CC
V
IN
V
IH
V
IL
∆t/∆V
T
A
Tr
Parameter
Supply Voltage
Input Voltage
High-level Input Voltage at MR and WDI
Low-level Voltage
Input Transition Rise and Fall Rate at
MR
or WDI
Operating Free-air Temperature Range
Vcc Rising Time (Vcc = 0~V
T
)
Min.
1.1
0
0.8
×
V
CC
-
-
-40
Max.
6
(V
CC
+0.3)
-
0.2
×
V
CC
100
85
1
Unit
V
V
V
V
ns/V
o
C
uS
Electrical Characteristics
(Over recommended operating free-air temperature range, unless otherwise noted)
Sym.
Parameter
AP1705/6/7-25
AP1705/6/7-30
RESET
AP1705/6/7-33
V
OH
High-level Output
Voltage
AP1705/6/7-50
AP1706/7-25
RESET AP1706/7-30
AP1706/7-33
AP1706/7-50
AP1706/7-25
RESET
V
OL
Low-level Output
Voltage
AP1706/7-30
AP1706/7-33
AP1706/7-50
AP1705/6/7-25
AP1705/6/7-30
RESET
AP1705/6/7-33
AP1705/6/7-50
V
RESET
Power-up Reset Voltage (see Note 2)
Test Conditions
V
CC
=V
IT-
+0.2V
I
OH
=-20µA
V
CC
=V
IT-
+0.2V
I
OH
=-30µA
V
CC
=V
IT-
+0.2V
I
OH
=-120µA
V
CC
> 1.8V,
I
OH
= -100µA
V
CC
> 1.8V,
I
OH
= -150µA
V
CC
=V
IT-
+0.2V
I
OL
=1mA
V
CC
=V
IT-
+0.2V
I
OL
=1.2mA
V
CC
=V
IT-
+0.2V
I
OL
=3mA
V
CC
=V
IT-
-0.2V
I
OL
=1mA
V
CC
=V
IT-
-0.2V
I
OL
=1.2mA
V
CC
=V
IT-
-0.2V
I
OL
=3mA
V
CC
> 1.1V,
I
OL
=20µA
Min.
0.8
×
V
CC
V
CC
-1.5V
Typ.
-
-
Max.
-
-
Unit
V
V
0.8
×
V
CC
-
-
V
-
-
0.4
V
-
-
0.4
V
-
-
0.4
V
Note 2:
The lowest supply voltage at which
RESET becomes active. T
r
, V
CC
> 15µs/V
Anachip Corp.
www.anachip.com.tw
3/13
Rev. 1.0 Nov. 17, 2005
AP1705/6/7
Processor Supervisory Circuits
Electrical Characteristics
(Over recommended operating free-air temperature range, unless otherwise noted)
Sym.
Parameter
AP1705/6/7-25
AP1705/6/7-30
AP1705/6/7-33
AP1705/6/7-35
AP1705/6/7-43
AP1705/6/7-45
AP1705/6/7-50
AP1705/6/7-25
AP1705/6/7-30
AP1705/6/7-33
AP1705/6/7-35
AP1705/6/7-43
AP1705/6/7-45
AP1705/6/7-50
AP1705/6/7-25
AP1705/6/7-30
AP1705/6/7-33
AP1705/6/7-35
AP1705/6/7-43
AP1705/6/7-45
AP1705/6/7-50
Test Conditions
Min.
2.21
2.59
2.88
3.00
3.93
4.31
4.56
2.20
2.57
2.86
3.00
3.92
4.30
4.55
-
Typ.
2.25
2.63
2.93
3.08
4.00
4.38
4.63
2.25
2.63
2.93
3.08
4.00
4.38
4.63
50
Max.
2.30
2.69
3.00
3.15
4.08
4.46
4.71
2.30
2.69
3.00
3.15
4.08
4.46
4.71
-
Unit
T
A
= 0
o
C-85
o
C
V
V
IT-
Negative-going
Input Threshold
Voltage
(see Note 3)
T
A
= -40
o
C-85
o
C
V
V
hys
Hysteresis at V
CC
Input
mV
-
WDI=V
CC
,
Time average
(dc=88%)
WDI=0.3V, V
CC
=5.5V
time average (dc=12%)
50
-
Average
I
IH(AV)
High-level Input
Current
Average
I
IL(AV)
Low-level Input
Current
I
IH
I
IL
High-level Input
Current
Low-level Input
Current
Output
Short-circuit
Current
(see note 4)
Supply Current
-
-
-
-
-
-
-
-
120
-15
140
-40
140
-110
-
-
25
60
50
5
-
-
190
-60
190
-160
-500
-500
35
-
-
-
µA
µA
WDI
WDI
WDI=V
CC
V
CC
=5.5V
WDI=0.3V, V
CC
=5.5V
MR
WDI
MR
=V
CC
×
0.7,
µA
µA
MR
AP1705/6/7-25
AP1705/6/7-30
RESET
AP1705/6/7-33
AP1705/6/7-50
WDI and
MR
Unconnected, Outputs
unconnected
MR
=0.3V, V
CC
=5.5V
V
CC
=V
IT, mas
+0.2V,
V
O
=0V
I
OS
µA
I
CC
V
CC
= V
IT-
+1.0V
-
-
µA
kΩ
ppm/
o
C
pF
TC
C
i
Internal Pull-up Resistor at
MR
V
OUT
Temperature Coefficient
Input Capacitance at
MR
, WDI
V
I
=0V to 5.5V
-
Note 3:
To ensure best stability of the threshold voltage, a bypass capacitor (ceramic, 0.1µF) should be placed near the supply
terminals.
Note 4:
The
RESET
short-circuit current is the maximum pull-up current when
