ST STM1818 User Manual
查询STM1810供应商
STM1810, STM1811, STM1812, STM1813
STM1815, STM1816, STM1817, STM1818
FEAT URES SUM MARY
■ PRECISION MONITORING OF 3V, 3.3V,
AND 5V SUPPLY VOLTAGES
■ FOUR OUTPUT CONFIGURATIONS
– Push-Pull, Active-High (STM1812,1817)
– Push-Pull, Active-Low (STM1810,1815)
– Open Drain, Active-Low (STM1811,1816)
– Open Drain, Active-Low with Push-Button
Detect (STM1813,1818)
■ RESET PULSE WIDTH - 100ms (min)
■ LOW SUPPLY CURRENT - 4uA (typ)
■ GUARANTEED ASSERTION DOWN TO
= 1.0V (0°C to 105°C)
V
CC
■ FACTORY-TRIMMED RESET
THRESHOLDS OF 2.55V, 2.88V, 3.06V,
4.37V, and 4. 62V (typ)
■ POWER SUPPLY TRANSIENT IMMUNITY
■ PUSH-BUTTON/MANUAL RESET DETECT
(STM1813/1818)
■ OPERATING TEMPERAT UR E:
–40°C TO 105°C
■ ±2.5% RESET THRESHOLD ACCURACY
(–40°C TO 105°C)
■ AVAILABLE IN THE SOT23-3 PACKAGE
■ FULLY COMPATIBLE WITH DS181x AND
MXD181x PRODUCTS
Low Power Reset Circu it
PRELIMINARY DATA
Figure 1. Packages
SOT23-3 (WX)
Table 1. Device Options
3.3V/
5V
3.0V
STM1810L/M ✔✔
STM1811L/M ✔
STM1812L/M ✔✔
STM1813L/M ✔ ✔
STM1815T/S/R ✔✔
STM1816T/S/R ✔
STM1817T/S/R ✔✔
STM1818T/S/R ✔✔
Note: 1. Active-low RST with inter nal pull-up resistor
June 2005
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
Active-Low
RESET
(Push-Pull)
Active-Low
RESET
(Open Drain)
(1)
✔
(1)
✔
Active-High
RESET
(Push-Pull)
Active-Low RESET
(Open Drain,
Bi-directional, with MR
Detect)
Rev 5
1/20
STM1810/1811/1812/1813/1815/1816/1817/1818
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. P ack ages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Logi c Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 3. S OT 23-3 Connect ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FUNCTIONAL BLOCK DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Figure 5. P ush-pull Active-Low Output (STM1810/ 1812/1815/1817) . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 6. Open Drain, Active-Low Output (STM1811/1816). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 7. Open Drain, Active-Low Output (Bi-directional, Manual Reset Detect, STM1813/1818) . . 5
PIN DESCRIPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. S TM 1810 /STM 181 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. S TM 1811 /STM 181 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. S TM 1812 /STM 181 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 6. S TM 1813 /STM 181 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Push-Button Detect Reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Interfacing to Bidirectional Microcontrollers (MCU’s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Negative Going V
Valid RST
Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CC
Figure 8. Reset Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9. P ush-Button Ma nual Reset with MR
Detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . .8
Figure 10.Manual Reset Timing Diagram, Switch Bounce/Debounce (S TM1813/ 1818). . . . . . . . . . 8
Figure 11.Interfacing MCUs with Bi-Directional Reset Pins (RST
Figure 12.Valid Reset (RST
Figure 13.Valid Reset (RST) Output Down to V
) Output Down to VCC = 0V (Push-pull). . . . . . . . . . . . . . . . . . . . . . . . .9
= 0V (Push-pull). . . . . . . . . . . . . . . . . . . . . . . . .9
CC
, Open Drain, STM1811/1816). . . 8
TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 14.Supply Current vs. Temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 15.Normalized Reset Time-out Period (t
Figure 16.V
Figure 17.Voltage Output Low vs. I
Figure 18.Voltage Output High vs. I
-to-Reset Output Delay vs. Temperature - VOD = VTH – VCC . . . . . . . . . . . . . . . . . 11
CC
SINK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SOURCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
) vs. Temperature - VOD = VTH – VCC . . . . . . . 10
rec
Figure 19.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 20.Max Transient Duration NOT Causing Reset Pulse vs. Reset Threshold Overdrive . . . 13
2/20
STM1810/1811/1812/1813/1815/1816/1817/1818
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 7. Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Operating and AC Measurement Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 21.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 9. DC and A C Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 22.SOT23-3 – 3-lead Small Outline Transistor Package Outline. . . . . . . . . . . . . . . . . . . . . 16
Table 10. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 16
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 11.Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Table 12.Marking Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 13.Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3/20
STM1810/1811/1812/1813/1815/1816/1817/1818
SUMMARY DESCRIPTION
STM181x devices are low power reset devices
used to monitor power supplies for microcont rollers. They perform a single function: as serting a
reset signal whenever V
below a preset value and keeping it asserte d unt il
has risen above the preset threshold for a
V
CC
minimum period of time (t
lent circuit reliability without additional external
components when used with +3.0V/+3.3V
(STM1815–STM1818), and +5V (STM1810–
STM1813) power supply systems.
A precision voltage reference and comparator
monitors the V
input for an out-of-tolerance con-
CC
dition. When an invalid V
reset output (RST
) is forced low (or high in the
case of RST) and remains asserted for t
rises above the reset threshold. The
V
CC
STM1813/1818 also keep reset asserted for t
after the output is momentarily pulled to ground by
an external push-button switch.
The STM1812 and STM1817 have an active-high,
push-pull output. The STM1810 and STM1815
(push-pull) and STM1811, STM1813, STM1816,
supply voltage drops
CC
). They provide excel-
rec
condition occurs, the
CC
rec
after
rec
and STM1818 (open drain) have an active-low
output. The open drain devices (STM1811/
RST
STM1813/STM1816/STM1818) also have an internal pull-up resistor to V
. The STM1813 and
CC
STM1818 feature a debounced manual reset feature that asserts a reset if the RST
pin is pulled low
for more than 1.5µs. When used to initiate manual
reset, RST
debounces s ignals from device s such
as mechanical switches. For devices with this feature, the release of the external switch triggers the
reset period.
The STM181x devices are guaranteed to output
the correct logic state for V
down to 1.0V (0°C
CC
to +105°C). They also provide a reset comparator
designed to ignore fast transients on V
CC
.
Reset thresholds are available between +2.55V
and +4.62V These small, low power devices are
ideal for use in port able equipment. All are available in the space-saving 3-pin SOT23 package,
and are specified from –40°C to +105°C. Figure
4., page 5 shows a typical hardware hookup for
STM181x devices to a Microcontroller.
Figure 2. Logic Diagram
V
CC
STM181x
V
SS
Note: 1. For STM1812, STM1817
RST (RST)
AI09648
(1)
Table 2. Signal Names
V
SS
RST
RST
V
CC
Note: 1. For STM1812, STM1817
Ground
Active-low Reset Output
(1)
Active-high Reset Output
Supply Voltage and Input for Reset
Threshold Monitor
Figure 3. SOT23-3 Connections
RST (RST)
V
CC
Note: RST for STM1812 and STM1817
1
3
2
AI09649
V
SS
4/20
Figure 4. Hardware Hookup
V
CC
STM1810/1811/1812/1813/1815/1816/1817/1818
V
CC
STM181x
(1)
RST
Push-button
V
SS
Note: 1. RST for STM1812 and S TM1817 (see Ta bl e 1. , Device Opti ons)
2. Only valid for STM1813 and STM1818.
RESET
(2)
MCU
RESET
Input
FUNCTI ONAL BLOCK DIAGRAMS
Figure 5. Push-pull Active-Low Output (STM1810/1812/ 181 5/18 17)
V
CC
V
RST
COMPARE
t
rec
Generator
V
CC
V
SS
AI09652a
(1)
RST
AI09651a
Note: 1. RST for STM 1812 and STM 1817.
Figure 6. Open Drain, Active-Low Output (STM1811/1816)
(1)
V
CC
Note: 1. 5.5kΩ inter n al pull- up resist or
t
V
RST
COMPARE
rec
Generator
5.5kΩ
RST
AI09672
Figure 7. Open Drain, Active-Low Output (Bi-directional, Manual Reset Detect, STM1813/1818)
(1)
5.5kΩ
RST
AI09673
V
CC
V
RST
Note: 1. 5.5kΩ inter n al pull- up resist or
COMPARE
t
rec
Generator
Push-button
Detect
5/20
STM1810/1811/1812/1813/1815/1816/1817/1818
PIN DES CRIPTIONS
See Figure 2., Logic Diagram and Table 2., Signal
Names for a brief overview of the signals connect-
ed to this de vice.
Active-Low RST
low when V
long as V
CC
mains low for t
Output (Push-pull). Pulses
drops below V
CC
, and stays low as
RST
is below the reset threshold. It re-
after VCC rises above the reset
rec
threshold.
Active-Low RST
low when V
long as V
CC
mains low for t
thres ho ld. R ST
Output (Open D rain) . Pulses
drops below V
CC
, and stays low as
RST
is below the reset threshold. It re-
after VCC rises above the reset
rec
output has a n internal 5.5k Ω p ull-
up resistor.
Table 3. STM1810/STM1815
Pin Name Function
1RST
2
3
V
V
Active-low Reset Output (Push-pull)
Supply Voltage and Input for Reset Threshold Monitor
CC
Ground
SS
Active-hi gh R S T Ou t put (P us h -p ul l ). Pulses
high when V
as long as V
mains high for t
threshold.
Active-Low RST
nal 5.5kΩ pull-up) with Manual Reset Detect.
Pulses low when V
is externally pulled low for at least 1.5µs. It remains low for t
set threshold, or after the external manual reset is
released (see Figure 10., page 8). RST
an internal 5.5kΩ pull-up resistor.
V
CC
tor.
V
SS
ply. It must be connected to the system ground.
drops below V
CC
is below the reset threshold. It re-
CC
after VCC rises above the reset
rec
, and stays high
RST
Output (Open Drain with inter-
drops below V
CC
after VCC rises above the re-
PBRST
RST
, or RST
output has
. Supply voltage and input for V
compara-
RST
. Ground, is the reference for the power sup-
Table 4. STM1811/STM1816
Pin Name Function
1RST
2
3
V
V
Active-low Reset Output (Open Drain, with internal 5.5kΩ pull-up resistor)
Supply Voltage and Input for Reset Threshold Monitor
CC
Ground
SS
Table 5. STM1812/STM1817
Pin Name Function
1 RST Active-high Reset Output (Push-pull)
2
3
V
V
Supply Voltage and Input for Reset Threshold Monitor
CC
Ground
SS
Table 6. STM1813/STM1818
Pin Name Function
1RST
2
3
V
V
Active-low Reset Output (Open Drain, with internal 5.5kΩ pull-up) with Push-Button/Manual
Reset Detect
Supply Voltage and Input for Reset Threshold Monitor
CC
Ground
SS
6/20
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