STM812 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM812

Reset Circuit

STMicroelectronics 

STM809/810/811/812

SUMMARY DESCRIPTION

The STM809/810/811/812 MICROPROCESSOR

RESET Circuits are low-power supervisory devic-

es used to monitor power supplies. They perform

a single function: asserting a reset signal whenev-

er the VCC supply voltage drops below a preset

value and keeping it asserted until VCC has risen

above the preset threshold for a minimum period

of time (trec). The STM811/812 also provide a

push-button reset input (MR).

Figure 2. Logic Diagram (STM809/810)

VCC

STM809/810

RST (RST)(1)

VSS

Note: 1. For STM810

AI07832

Figure 3. Logic Diagram (STM811/812)

VCC

Table 2. Signal Names

VSS

Ground

RST

Active-Low RESET Output

RST(1)

Active-High RESET Output

VCC

Supply Voltage

MR(2)

Manual Reset Input

Note: 1. STM810/812 only

2. STM811/812 only

Figure 4. SOT23-3 Connections

VSS 1

RST (RST) 2

3 VCC

(For STM810)

AI07833

Figure 5. SOT143-4 Connections

MR

STM811/812

RST (RST)(1)

VSS 1

RST (RST) 2

4 VCC

3 MR

VSS

Note: 1. For STM812

AI07831

(For STM812)

AI07834

Figure 6. Block Diagram

VCC

VRST

COMPARE

MR(1)

DEBOUNCE

Note: 1. STM811/812 only

2. RST for STM810/812

trec

Generator

RST(2)

AI07835

4/18

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