LTC2917I データシートの表示（PDF） - Linear Technology

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LTC2917I

Voltage Supervisor with 27 Selectable Thresholds and Watchdog Timer

Linear Technology 

LTC2917/LTC2918

BLOCK DIAGRAM

LTC2917

SEL1 SEL2 TOL

3 STATE

DECODE

VM

MONITOR

DIVIDER

MATRIX

–

+

–+ 0.5V

REFERENCE

DIVIDER

MATRIX

LTC2918

MR

VCC

100k

RT

VCC DETECT

VCC

VCC

6.2V

INTERNAL

200ms TIMER

ADJUSTABLE

RESET TIMER

INTERNAL

1.6 SECOND

TIMER

ADJUSTABLE

WATCHDOG

TIMER

RST

RESET

DRIVER LOGIC

GND

WATCHDOG

LOGIC

VCC DETECT

WT

WDI

29178 BD

TIMING DIAGRAMS

Monitor Input Timing

VM VMTx

tUV

RST

1V

tRST

29178 TD01

Watchdog Timing (LTC2917-A, LTC2918-A)

WDI

RST

tWDU

tRST

29178 TD01

Watchdog Timing (LTC2917-B, LTC2918-B)

WDI

RST

t < tWDL

tRST

t > tWDL

tWDU

tRST

29178 TD03

8

29178fb

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