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STM1816: DescriptionLow Power Reset Circuit; File Size274KB，25 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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STM1816 Overview

Low Power Reset Circuit

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STM1810 STM1811 STM1812 STM1813

STM1815 STM1816 STM1817 STM1818

Low power reset circuit

Features

■

Precision monitoring of 3 V, 3.3 V, and 5 V

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 - 100 ms (min.)

Low supply current - 4 µA (typ.)

Guaranteed assertion down to V

= 1.0 V

(0 °C to 105 °C)

Factory-trimmed reset thresholds of 2.55 V,

2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.)

Power supply transient immunity

Push-button/manual reset detect

(STM1813/1818)

Operating temperature: –40 °C to 105 °C

Device summary

✔

(1)

✔

3.3 V/

3.0 V

Active-low

reset

(push-pull)

✔

(1)

✔

Active-low

reset

(open-drain)

Active-high

reset

(push-pull)

Active-low reset

(open-drain,

bidirectional, with MR detect)

■

SOT23-3 (WX)

■

± 2.5% reset threshold accuracy:

(–40 °C to 105 °C)

Available in the SOT23-3 package

Fully compatible with DS181x and MXD181x

products.

Table 1.

Order codes

STM1810L/M

STM1811L/M

STM1812L/M

STM1813L/M

STM1815T/S/R

STM1816T/S/R

STM1817T/S/R

STM1818T/S/R

1. Active-low RST with internal pull-up resistor.

September 2010

Doc ID11464 Rev 8

1/25

www.st.com

Contents

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

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1

1.2

Functional block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.2.6

Active-low RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Active-low RST output (open-drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Active-high RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with

manual reset detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1

2.2

2.3

2.4

2.5

Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Push-button detect reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . 9

Interfacing to bidirectional microcontrollers (MCU’s) . . . . . . . . . . . . . . . . . 9

Negative going V

transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Valid RST output down to V

= 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.1

ECOPACK

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2/25

Doc ID11464 Rev 8

List of figures

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

List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Figure 17.

Figure 18.

Figure 19.

Figure 20.

Figure 21.

Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SOT23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Push-pull active-low output (STM1810/1812/1815/1817) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Open-drain, active-low output (STM1811/1816) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) . . . . . . 7

Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Push-button manual reset with MR detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . 10

Manual reset timing diagram, switch bounce/debounce (STM1813/1818) . . . . . . . . . . . . . 11

Interfacing MCUs with bidirectional reset pins (RST, open-drain, STM1811/1816) . . . . . . 11

Valid reset (RST) output down to V

= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Valid reset (RST) output down to V

= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Normalized reset time-out period (t

rec

) vs. temperature - V

= V

– V

. . . . . . . . . . . 13

-to-reset output delay vs. temperature - V

= V

– V

. . . . . . . . . . . . . . . . . . . . . 14

Voltage output low vs. I

SINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Voltage output high vs. I

SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Max. transient duration NOT causing reset pulse vs. reset threshold overdrive. . . . . . . . . 16

AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 20

4/25

Doc ID11464 Rev 8

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