HA16117F Datasheet, PDF(2/31 Page) Hitachi Semiconductor

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HA16117F Datasheet, PDF (2/31 Pages) Hitachi Semiconductor – CMOS Watchdog Timer

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HA16117F Series

Ordering Information

The HA16117F Series includes three ICs with different low threshold levels (VTL).

Type No.

HA16117FPA/FPAJ

HA16117FPB/FPBJ

HA16117FPC/FPCJ

Low Threshold Voltage (VTL)

4.4 V Typ

4.2 V Typ

4.0 V Typ

Pin Arrangement

VCC 1

P-RUN 2

CF 3

CR 4

8 Tadj

7 ACC

6 GND

5 RES

(Top view)

Pin Description

Pin No.

Symbol

Function

VCC

Power supply voltage input

P-RUN

Watchdog timer (WDT) input

Connected capacitor CF determines WDT filter characteristic

(normal frequency range)

Connected capacitor CR determines tON for power-on reset and tOFF, tRH,

and tRL for auto-reset

RES

Reset signal output from WDT and voltage supervision circuits

GND

Ground

ACC

WDT on/off control input (on when ACC is low)

Tadj *

For adjusting tRH and tOFF (divide VCC to get the adjustment voltage)

Note: The low-voltage threshold cannot be modified by changing the external resistors connected to the

Tadj pin.

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