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STM6905TWEDS6F

Quintuple, ultralow voltage supervisor with push-button reset

STMicroelectronics 

STM6905

1

Description

Description

The STM6905 supervisor is a low voltage/low supply current processor supervisor,

designed to monitor up to five system power supply voltages. This device is targeted at

applications such as set-top boxes (STBs), portable, battery-powered systems, networking

and communication systems.

The device supports a push-button type manual reset input (MR). Two of the five supply

monitors (VCC and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds

(VRST1 and VRST2). The other three voltage monitor inputs (V3IN, V4IN and V5IN) are

monitored using externally adjustable threshold (600 mV internal reference) to meet specific

level requirements.

If any of the five monitored voltages drops below its factory-trimmed or adjustable

thresholds, or if the MR is asserted to logic low, the reset output RST is asserted (driven

low). Once asserted, RST is maintained low for a minimum delay period (tREC) after ALL

monitored supplies rise above their respective thresholds and MR returns to high. The reset

output logic state is valid for VCC greater than 0.8 V.

The STM6905 is available in a standard 8-lead MSOP (TSSOP) package.

Figure 1. Logic diagram

VCC

V2IN

V3IN

V4IN

V5IN

MR

STM6905

RST

VSS

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Figure 2. MSOP/TSSOP-8 connections

MR

1

VCC

2

V2IN

3

VSS

4

8

RST

7

V5IN

6

V4IN

5

V3IN

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DocID14290 Rev 4

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