STM705(2005) データシートの表示（PDF） - STMicroelectronics

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STM705
(Rev.:2005)

5V Supervisor

STMicroelectronics 

STM705/706/707/708/813L

SUMMARY DESCRIPTION

The STM705/706/707/708/813L Supervisors are

self-contained devices which provide micropro-

cessor supervisory functions. A precision voltage

reference and comparator monitors the VCC input

for an out-of-tolerance condition. When an invalid

VCC condition occurs, the reset output (RST) is

forced low (or high in the case of RST).

These devices also offer a watchdog timer (except

for STM707/708) as well as a power-fail compara-

tor to provide the system with an early warning of

impending power failure.

These devices are available in a standard 8-pin

SOIC package or a space-saving 8-pin TSSOP

package.

Figure 2. Logic Diagram (STM705/706/813L)

Figure 3. Logic Diagram (STM707/708)

WDI

MR

PFI

VCC

STM705/706;

STM813L

VSS

WDO

RST(1)

RST(2)

PFO

AI08825

VCC

RST

MR

STM707/708

RST

PFI

PFO

VSS

AI08826

Note: 1. For STM705/706 only.

2. For STM813L only.

Table 2. Signal Names

MR

Push-button Reset Input

WDI

Watchdog Input

WDO

Watchdog Output

RST

Active-Low Reset Output

RST(1)

Active-High Reset Output

VCC

Supply Voltage

PFI

Power-fail Input

PFO

Power-fail Output

VSS

Ground

NC

No Connect

Note: 1. For STM813L only.

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