TC70 View Datasheet(PDF) - TelCom Semiconductor, Inc

Part Name

Description

MFG CO.

TC70

MICROMASTER™ – SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR, WATCHDOG AND BATTERY BACKUP

TelCom Semiconductor, Inc 

1 2 3 4 5 6 7

TC70

TC71

MICROMASTER™ – SYSTEM SUPERVISOR

WITH POWER SUPPLY MONITOR, WATCHDOG

AND BATTERY BACKUP

FILTER CAP

RECTIFIER

WDD

TC55RP

REGULATOR

R3

VCC

VCC

TDI

AC IN

VCCO

PF

TC71

TDO

R4

VBATT

RS

3V LI

GND

VCC

CE

CE

CMOS

RAM

ADDRESS

DECODER

VCC

R3

10K

R4

13K

RESET

Figure 2. TC71 Typical Application

ADDRESS

NMI

I/O

RESET

PROCESSOR

RS

VSTH (MIN)

VSTL (MAX)

VSTL (MIN)

tST

tTD

Note: tTD is the maximum elapsed time between strobes which

will keep the watchdog timer from forcing RS LOW.

(A STROBE is defined as a high-to-low transition from VSTH to VSTL).

Figure 3. Watchdog Strobe

PB CLOSED PB OPEN

RS

tPBH

VIH

VIL

tRST

Figure 4. RS Override Reset

5-12

TELCOM SEMICONDUCTOR, INC.

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