STM1818TWX7F STMicroelectronics, STM1818TWX7F Datasheet

STM1818TWX7F

Manufacturer Part Number

STM1818TWX7F

Description

IC MPU RESET CIRCUIT 3.06V SOT23

Manufacturer

STMicroelectronics

Type

Simple Reset/Power-On Resetr

Datasheet

1.STM1815TWX7F.pdf (25 pages)

Specifications of STM1818TWX7F

Number Of Voltages Monitored

Output

Open Drain or Open Collector

Reset

Active Low

Reset Timeout

100 ms Minimum

Voltage - Threshold

3.06V

Operating Temperature

-40°C ~ 105°C

Mounting Type

Surface Mount

Package / Case

SOT-23-3

Monitored Voltage

3 V or 3.3 V or 5 V

Undervoltage Threshold

2.98 V

Overvoltage Threshold

3.15 V

Manual Reset

Resettable

Watchdog

Battery Backup Switching

Supply Voltage (max)

5.5 V

Supply Voltage (min)

1.2 V

Supply Current (typ)

16 uA

Maximum Power Dissipation

320 mW

Mounting Style

SMD/SMT

Maximum Operating Temperature

+ 105 C

Chip Enable Signals

Minimum Operating Temperature

- 40 C

Output Type

Active Low or Open Drain

Power Fail Detection

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

497-4796-2

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Features

■

Table 1.

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

September 2010

STM1810L/M

STM1811L/M

STM1812L/M

STM1813L/M

STM1815T/S/R

STM1816T/S/R

STM1817T/S/R

STM1818T/S/R

Order codes

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

Reset pulse width - 100 ms (min.)

Low supply current - 4 µA (typ.)

Guaranteed assertion down to 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

detect (STM1813,1818)

Device summary

5 V

✔

3.3 V/

3.0 V

✔

STM1810 STM1811 STM1812 STM1813

STM1815 STM1816 STM1817 STM1818

(push-pull)

Active-low

reset

✔

= 1.0 V

(open-drain)

Doc ID11464 Rev 8

Active-low

reset

✔

(1)

■

Active-high

(push-pull)

± 2.5% reset threshold accuracy:

(–40 °C to 105 °C)

Available in the SOT23-3 package

Fully compatible with DS181x and MXD181x

products.

reset

✔

Low power reset circuit

bidirectional, with MR detect)

SOT23-3 (WX)

Active-low reset

(open-drain,

✔

www.st.com

1/25

Related parts for STM1818TWX7F

STM1818TWX7F Summary of contents

Page 1

STM1810 STM1811 STM1812 STM1813 STM1815 STM1816 STM1817 STM1818 Features ■ Precision monitoring 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, ...

Page 2

Contents Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

STM1810/1811/1812/1813/1815/1816/1817/1818 List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 4

List of figures List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 5

STM1810/1811/1812/1813/1815/1816/1817/1818 1 Description STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever V supply voltage drops below a preset value and keeping it asserted until ...

Page 6

Description Table 2. Signal names Symbol V Ground SS RST Active-low reset output (1) RST Active-high reset output V Supply voltage and input for reset threshold monitor CC 1. For STM1812, STM1817. Figure 2. SOT23-3 connections 2. RST for STM1812 ...

Page 7

STM1810/1811/1812/1813/1815/1816/1817/1818 1.1 Functional block diagrams Figure 4. Push-pull active-low output (STM1810/1812/1815/1817) 1. RST for STM1812 and STM1817. Figure 5. Open-drain, active-low output (STM1811/1816) 1. 5.5 kΩ internal pull-up resistor. Figure 6. Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) 1. ...

Page 8

Description 1.2.3 Active-high RST output (push-pull) Pulses high when V threshold. It remains high for t 1.2.4 Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with manual reset detect Pulses low when V It remains low for t manual ...

Page 9

STM1810/1811/1812/1813/1815/1816/1817/1818 2 Operation 2.1 Reset output The STM181x asserts a reset signal to the microcontroller (MCU) whenever V below the reset threshold (V 105 °C). A microcontroller’s (MCU) reset input starts the MCU in a known state. The STM1810 - ...

Page 10

Operation 2.5 Valid RST output down to V When V falls below 1 V, the RST output no longer sinks current, but becomes an open CC circuit. In most systems this is not a problem, as most MCUs do not ...

Page 11

STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 9. Manual reset timing diagram, switch bounce/debounce (STM1813/1818) Figure 10. Interfacing MCUs with bidirectional reset pins (RST, open-drain, STM1811/1816) Figure 11. Valid reset (RST) output down ~100 kΩ resistor recommended (push-pull) CC ...

Page 12

Operation Figure 12. Valid reset (RST) output down ~100 kΩ resistor recommended. 12/25 STM1810/1811/1812/1813/1815/1816/1817/1818 = 0 V (push-pull) CC Doc ID11464 Rev 8 ...

Page 13

STM1810/1811/1812/1813/1815/1816/1817/1818 3 Typical operating characteristics Typical values are at T Figure 13. Supply current vs. temperature (no load) Figure 14. Normalized reset time-out period ( ° – Doc ID11464 ...

Page 14

Typical operating characteristics Figure 15 Figure 16. Voltage output low vs. I 14/25 STM1810/1811/1812/1813/1815/1816/1817/1818 -to-reset output delay vs. temperature - V SINK Doc ID11464 Rev – ...

Page 15

STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 17. Voltage output high vs. I Figure 18. Normalized reset threshold vs. temperature Typical operating characteristics SOURCE Doc ID11464 Rev 8 15/25 ...

Page 16

Typical operating characteristics Figure 19. Max. transient duration NOT causing reset pulse vs. reset threshold overdrive 1. Reset occurs above the line. 16/25 STM1810/1811/1812/1813/1815/1816/1817/1818 Doc ID11464 Rev 8 ...

Page 17

... These are stress ratings only and operation of the device at these or any other conditions above those indicated in the “Operating” sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics™ “SURE Program” and other relevant quality documents. Table 7. ...

Page 18

DC and AC parameters 5 DC and AC parameters This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC characteristics tables that follow, are derived from tests ...

Page 19

STM1810/1811/1812/1813/1815/1816/1817/1818 Table 9. DC and AC characteristics Alter- Sym. Description native V Operating voltage supply current Input high voltage IH V Input low voltage IL V Output high voltage OH RST output source current ...

Page 20

Package mechanical 6 Package mechanical ® 6.1 ECOPACK In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are ...

Page 21

STM1810/1811/1812/1813/1815/1816/1817/1818 Table 10. SOT23-3 – 3-lead small outline transistor package mechanical data Symbol Typ. Min. Max. 0.89 1.12 0.01 0.10 0.88 1.02 0.30 0.50 0.08 ...

Page 22

Part numbering 7 Part numbering Table 11. Ordering information scheme Example Device type STM181x Reset threshold voltage STM1810 - 1813 4. 4.75 V (4.62 V typ.) RST 4. ...

Page 23

STM1810/1811/1812/1813/1815/1816/1817/1818 Table 12. Marking description Part number STM1810L STM1810M STM1811L STM1811M STM1812L STM1812M STM1813L STM1813M STM1815T STM1815S STM1815R STM1816T STM1816S STM1816R STM1817T STM1817S STM1817R STM1818T STM1818S STM1818R letter assigned to indicate assembly work week (i.e ...

Page 24

Revision history 8 Revision history Table 13. Document revision history Date Revision 26-Aug-04 05-Oct-04 19-Nov-04 07-Dec-04 29-Jun-05 11-Oct-05 28-Aug-2007 02-Sep-2010 24/25 STM1810/1811/1812/1813/1815/1816/1817/1818 1.0 First Issue. 2.0 Update reset characteristics, add typical graphs, remove SC70 references (Figure , ...

Page 25

... STM1810/1811/1812/1813/1815/1816/1817/1818 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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