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

OPERATION

Reset Output

The STM181x asserts a reset signa l to t he M icro­controller (MCU) whenever V
reset threshold (V
down to V

= 1.0V (0° to 105°C). A microcontrol-

CC

), and is guaranteed valid

RST

ler’s (MCU) reset input starts the MCU in a known
state. The STM1810 - STM1813/ STM1815 ­STM1818 Low Power Reset circuits assert reset to
prevent code-execution errors during power-up,
power-down, and brownout conditions (Figure

8., page 7).

During power-up, once V
threshold an internal timer keeps RST
reset time-out period, t

. After this interval, RST

rec

returns high.
If V

drops below the reset threshold, RST goes

CC

low. Each time RST

is asserted, it stays low for at
least the reset time-out period. Any time V
below the reset threshold, the internal timer clears.
The reset timer starts when V
reset threshold. Reset t

rec

externally initiated rising edge on the RST
(STM1813/STM1818), following a low signal of

1.5µs minimum duration.

Push-Button Detect Reset (STM1813/1818)

Many systems require push-button re set capabil ity
(Figure 9., page 8), allowing the user or external
logic circuitry to initiate reset. On the STM1813/
STM1818, a logic low on RST

1.5µs asserts a reset. RST
100ms minimum reset time-out delay (t
manual reset input shorter than 1.5µs may release

without the 1 00ms minimum reset time-out

RST
delay. To fac ilitate us e with mechanic al s witche s,
the STM1813/STM1818 contain internal de­bounce circuitry. A debounced waveform is shown
in Fi gur e 10. ,page 8 The RST
nal 5.5kΩ pull-up resistor.

Interfacing to Bidirectional Microcontrollers
(MCU’s)

As the RST

output on the STM1811/STM1816 is
open drain, these devices interface easily with
MCU’s that have bidirectional reset pins. Connect-

goes below the

CC

exceeds the reset

CC

low for the

goes

CC

returns above the

CC

is also triggered by an

pin

held for greater than

deasserts following a

). A

rec

output has an inter-

STM1810/1811/1812/1813/1815/1816/1817/1818

ing the µP supervisor’s reset (RST
to the microcontroller’s reset (RST
ther device to asse rt reset (Figure 11., page 8). No
externa l pull-up resistor is require d, as it is w ithin
the STM1811/STM1816.

Negative Go in g V

Transients

CC

The STM181x are relatively immune to negative­going V

transients (glitches). Figure

CC

20., page 13 shows typical transient duration ver-

sus reset comparator overdrive (for which the
STM181x will NOT generate a reset pulse). The
graph was gene rated using a negative pul se ap­plied to V

starting at 0.5V above the actual re-

CC,

set threshold and ending below it by the
magnitude indicated (comparator ov erdrive). The
graph indicates the maximum pulse width a nega­tive V

transient can ha ve without cau sing a re-

CC

set pulse. As the magnitude of the transient
increases (further below the thres hold), the maxi­mum allowable pulse width decreases . Any com­bination of duration and overdrive which lies under
the curve will NOT generate a reset signal. Typi­cally, a V

transient that goes 100mV below the

CC

reset threshold and lasts 20µs or less will not
cause a reset pulse. A 0.1µF bypass capacitor
mounted as close as possibl e to the V
vides additional transient immunity.

Valid R ST

When V

Output Down to VCC = 0V

falls below 1V, the RST output no long-

CC

er sinks current, but becomes an open circuit. In
most systems this is not a problem, as most MCUs
do not operate below 1V. However, in applications
where RST

output must be valid down to 0V, a
pull-down resistor may be added t o hold the RST
output low (see Figure 12., page 9). This resi stor
must be large enough to not load the RST
and still be small enough to pull the output to
ground. A 100kΩ res istor is recommended .

Note: The same situation applies for the active­high RST of the STM1810/1812. A 100kΩ pul l-up
resistor to V
valid for V

should be used if RST must remain

CC

< 1.0V .

CC

) output directly

) pin allows ei-

pin pro-

CC

output,

Figure 8. Reset Timing Diagram

V

CC

V

RST

(1)

RST

Note: 1. RST for STM1812 and S TM1817

CC

(min)

V

RST

t

t

rec

rec

AI09653

7/20

STM1810/1811/1812/1813/1815/1816/1817/1818

Figure 9. Push-Button Manual Reset with MR Detect (STM1813/1818)

V

CC

STM1813
STM1818

V

CC

5.5kΩ

Reset

Monitor

V

SS

RST

Micro RESET

Push-button RESET

AI09654

Figure 10. Manual Reset Timing Diagram, Switch Bounce/Debou nce (STM1813/ 1818)

V

CC

(Open)

External
Push-button

tPBRST

Switch Bounce

(Closed)

RST

Figure 11. Interfacing MCUs with Bi-Directional Reset Pins (RST

V

CC

tPBRST

, Open Drain, STM1811/1816)

AI09655

STM1811
STM1816

V

CC

5.5kΩ

RST

V

SS

RST
Input

V

CC

MCU

V

SS

AI09656

8/20

STM1810/1811/1812/1813/1815/1816/1817/1818

Figure 12. Va lid R eset (RST) Output Down to VCC = 0V (Push-pull)

V

CC

STM1810

V

CC

V

STM1815

MCU

RST

V

SS

RST
Input

(1)

R

P

V

Note: 1. ~100 kΩ re sistor reco m m ended.

Figure 13. Vali d Re set (RST) Outp ut Down to VCC = 0V (Push-pull)

V

CC

STM1812
STM1817

V

CC

(1)

R

P

V

MCU

RST

RST
Input

V

SS

V

CC

SS

AI09657

CC

SS

Note: 1. ~100 kΩ re sistor reco m m ended.

AI09658

9/20

STM1810/1811/1812/1813/1815/1816/1817/1818

TYPICAL OPERATING CHARACTERISTICS

Note: Typical values are at TA = 25°C .

Figure 14. Supply Current vs. Temperature (no load )

5

4

3

2

Supply Current (µA)

1

VCC = 1.8V
VCC = 3V
VCC = 5V

0

–40 –20 0 20 40 60 80 100

Temperature (˚C)

Figure 15. Normalized Re set Time- o ut Period (t

1.07

1.05

)

rec

1.03

Period (t

1.01

Normalized Reset Time-out

0.99
–40 –20 0 20 40 60 80 100

Temperature (°C)

) vs. Temperature - VOD = VTH – VCC

rec

AI10403

AI10402

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STM1810/1811/1812/1813/1815/1816/1817/1818

Figure 16. VCC-to-Reset Output Delay vs. Temperature - VOD = VTH – VCC

3.0

2.5

2.0

1.5

1.0

-to-Reset Output Delay (µs)
CC

V

0.5

0.0
–40 –20 0 20 40 60 80 100

Temperature (°C)

AI10404

Figure 17. Voltage Output Low vs. I

0.10

0.08

0.06

(V)

OUT

V

0.04

0.02

0.00
0123456

SINK

I

SINK

(mA)

VCC = 3V

AI10406

11/20

STM1810/1811/1812/1813/1815/1816/1817/1818

Figure 18. Voltage Output High vs. I

1.20

1.00

0.80

SOURCE

CC

/ V

0.60

OUT

V

0.40

0.20

0.00

0.0 1.0 2.0 3.0 4.0 5.0 6.0

I

SOURCE

(mA)

Figure 19. Nor m a liz ed R es et Threshol d vs . Tem perature

1.010

VCC = 3V

AI10407

1.005

1.000

0.995

Normalized Reset Threshold Voltage

0.990
–40 –20 0 20 40 60 80 100

Temperature (°C)

AI10405

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STM1810/1811/1812/1813/1815/1816/1817/1818

Figure 20. Max Transient Duration NOT Causing Reset Pulse vs. Reset Threshold Overdrive

30

25

20

15

10

Transient Duration (µs)

5

0

10 100 1000

Reset Threshold Overdrive (mV)

Note: Reset occurs above the li ne.

AI10408

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STM1810/1811/1812/1813/1815/1816/1817/1818

MAXIMUM RA T ING

Stressing the device above the rating l isted in the
Absolute Maximum Ratings” table may cause per­manent damage to the device. These are stress
ratings only and operation of the device at t hese or
any other conditions ab ove those i ndicated in t he
Operating sections of this specificat ion is not im-

Table 7. Absolute Maximum Ratings

Symbol Parameter Value Unit

plied. Exposure to Absolute Maximum Rating con­ditions for extended periods may affect device
reliability. Refer also to the STMicroelectronics
SURE Program and other relevan t quality docu­ments.

T

STG

(1)

T

SLD

V

IO

V

CC

I

O

P

D

Note: 1. Reflow at peak temperature of 2 55°C to 260° C f or < 30 seconds (total thermal budg et not to exce ed 180°C for between 90 t o 150

seconds).

Storage Temperature (VCC Off)
Lead Solder Temperature for 10 seconds 260 °C
Input or Output Voltage

Supply Voltage –0.3 to 7.0 V
Output Current 20 mA
Power Dissipation 320 mW

–55 to 150 °C

–0.3 to V

CC

+0.3

V

DC AND AC PARAMETERS

This section summarizes t he operating m easure­ment conditions, and the DC and AC characteris­tics of the device. The parameters in the D C and
AC characteristics Tables that follow, are derived
from tests performed under the Measurement

Table 8. Operating and AC Measurement Conditions

Parameter STM1810 - 1818 Unit

V

Supply Voltage

CC

Ambient Operating Temperature (T
Input Rise and Fall Times ≤ 5ns
Input Pulse Voltages
Input and Output Timing Ref. Voltages

)

A

Conditions summarized in Table 8, Operating and
AC Measurement Conditions. Designers should
check that the operating cond itions in their circuit
match the operating conditions when relying on
the quoted parameters.

1.0 to 5.5 V

–40 to 105 °C

0.2 to 0.8V

0.3 to 0.7V

CC

CC

V
V

Figure 21. AC Testing Input/Output Waveforms

0.8V

0.2V

14/20

CC

CC

0.7V

0.3V

AI02568

CC

CC

STM1810/1811/1812/1813/1815/1816/1817/1818

Table 9. DC and AC Characteristics

Sym

V

V

Alter-

native

CC

I

CC

V

IH

V

IL

OH

Operating Voltage

VCC Supply Current

Input High Voltage STM1813/1818 only
Input Low Voltage STM1813/1818 only

Output High Voltage 0 < IOH < 500µA

RST Output Source Current

I

OH

RST Output Source Current

Description

Test Condition

T

= 0 to +105°C

A

= –40 to +105°C

T

A

= 3.6V, No load

V

CC

= 5.5V, No load

V

CC

≥ V

V

CC

(max), Reset not

RST

asserted (STM1810/STM1815)

V

≤ V

CC

(min), Reset asserted

RST

(STM1812/STM1817)

VCC ≥ 2.7V, Reset asserted,

C

I

OL

OUT

RST Output Sink Current

RST Output Sink Current

Output Capacitance

(2)

V

= 0.4V (STM1810/1811/

OUT

1813/1815/1816/1818)

V

≥ 2.7V, Reset not asserted,

CC

V

= 0.4V, (STM1812/1817)

OUT

Reset Thresholds

STM181xL

STM181xM

V

RST

Reset Threshold

STM181xT

STM181xS

STM181xR

V

= (VTH + 100mV) falling to

t

RD

t

rec

VCC to RST Delay

RST Pulse Width

CC

(VTH – 200mV)

V

CC

Rising

Push-Button Reset Detect (STM1813, STM1818)

t

PB

t

PBRST

Note: 1. Valid for A m bi ent Operat in g T em perature: TA = –40 to 105°C; VCC = 1.2V to 5.5V (except where noted).

2. T he STM1811/1813/1816/1818 have an internal pul l -up resist or which may si nk 1mA of current.

Push-button Detect to RST STM1813/1818 1.5 µs
Push-button RST Time-out From Rising Edge

Internal Pull-up Resistance

STM1811/1816 3.5 5.5 7.5 kΩ
STM1813/1818 3.1 5.5 7.5 kΩ

(1)

Min Typ Max Unit

1.0 5.5 V

1.2 5.5 V

0.7V

CC

V

–

CC

0.5

10 mA

10 mA

25°C 4.62 V

–40 to 105°C 4.50 4.75 V

25°C 4.37 V

–40 to 105°C 4.25 4.49 V

25°C 3.06 V

–40 to 105°C 2.98 3.15 V

25°C 2.88 V

–40 to 105°C 2.80 2.97 V

25°C 2.55 V

–40 to 105°C 2.47 2.64 V

100 150 200 ms

100 150 200

410µA
916µA

V

0.4

VCC

– 0.1

V
V

350 µA

350 µA

10 pF

25µs

ms

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STM1810/1811/1812/1813/1815/1816/1817/1818

PACKAG E MECHANICAL

Figure 22. SOT23-3 – 3-lead Small Outline Transistor Package Outline

E

E1

B

1

e1

0.15

e

M

D

CAB

A1

0.20 C A B

3X b

C

M

A

θ

C

L1

3X

0.10 C

C

A2

L

SOT23-3

Note: Drawing is not to scale.

Table 10. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data

Symbol

Typ Min Max Typ Min Max

A 0.89 1.12 0.035 0.044
A1 0.01 0.10 0.001 0.004
A2 0.88 1.02 0.035 0.042

b 0.30 0.50 0.012 0.020

C 0.08 0.20 0.003 0.008
D 2.80 3.04 0.110 0.120

mm inches

A

E 2.10 2.64 0.083 0.104
E1 1.20 1.40 0.047 0.055

e 0.89 1.03 0.035 0.041

e1 1.78 2.05 0.070 0.081

L 0.54 0.021

L1 0.40 0.60 0.016 0.024

Θ 0° 8° 0° 8°
N3 3

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STM1810/1811/1812/1813/1815/1816/1817/1818

PART NUMBERING

Table 11. Ordering Information Scheme

Example: STM1810 L WX 7 F

Device Type

STM181x

Reset Threshold Voltage
STM1810 - 1813:

L = V
M = V

STM1815 - 1818:

T = V
S = V
R = V

= 4.50V to 4.75V (4.62 typ)

RST

= 4.25V to 4.49V (4.37 typ)

RST

= 2.98V to 3.15V (3.06 typ)

RST

= 2.80V to 2.97V (2.88 typ)

RST

= 2.47V to 2.64V (2.55 typ)

RST

Package

WX = SOT23-3

Temperature Range

7 = –40 to 105°C

Shipping Method

F = Pb-Free Package, Tape & Reel

Note: 1. Contact the local ST sales office for availability.

For other options, or for more information on any aspect of this device, please contact the ST Sales Office
nearest you.

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STM1810/1811/1812/1813/1815/1816/1817/1818

Table 12. Marking Description

Part Number Reset Threshold Output Topside Marking

STM1810L 4.62V Push -Pull R ST

STM1810M 4.37V Push -Pull R ST

STM1811L 4.62V Open Drain RST

STM1811M 4.37V Open Drain RST

STM1812L 4.62V Push-Pull RST

STM1812M 4.37V Push-Pull RST

STM1813L 4.62V Open Drain RST
STM1813M 4.37V Open Drain RST
STM1815T 3.06V Push-Pull R ST
STM1815S 2.88V Push-Pull RST
STM1815R 2.5 5V Push-Pull RST
STM1816T 3.06V Open Drain RST
STM1816S 2.88V Open Drain RST
STM1816R 2.55V Open Drain RST
STM1817T 3.06V Push-Pull RST
STM1817S 2.88V Push-Pull RST
STM1817R 2.55V Push-Pull RST
STM1818T 3.06V Open Drain RST
STM1818S 2.88V Open Drain RST
STM1818R 2.55V Open Drain RST

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STM1810/1811/1812/1813/1815/1816/1817/1818

REVISION HISTORY

Table 13. Document Revision History

Date Revision Revision Details

26-Aug-04 1.0 First Issue

05-Oct-04 2.0

19-Nov-04 3.0 Update dimensions (Table 10)
07-Dec-04 4.0 Remove some voltage options (Table 1, 9, 11, 12)
29-Jun-05 5 Temperature range change (Figure 14, 15, 16, 19; Table 8, 9, 11)

Update reset characteristics, add typical graphs, remove SC70 references (Figure

1, 2, 4, 7, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20; Table 9, 11, 12)

19/20

STM1810/1811/1812/1813/1815/1816/1817/1818

Information furnished is believed to be accurate and reliable. However, STMicroelectronics a ssumes no responsibility fo r the c onsequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted

by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject

to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not

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