ILC1832M datasheet(3/5 Pages) IMPALA

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Number

Name

Description

PBRST

Pushbutton reset input. This input is debounced and can be driven with external logic

signals or a mechanical pushbutton to actively force a reset. All pulses less than 1ms in

duration on the PBRST pin are ignored. Any pulse with a duration of 20ms or greater is

guaranteed to cause a reset. PBRST has an internal 40k

Ω (typical) pull-up resistor to V

CC.

Time delay input. This input selects the timebase used by the watchdog timer. When TD =

0V, the watchdog timeout period is set to a nominal value of 150ms, when TD = open, the

watchdog timeout period is set to a nominal value of 600ms and when TD = VCC, the

watchdog timeout period is 1.2 sec nominally.

TOL

Tolerance select input. Selects whether 5% or 10% of VCC is used as the reset threshold

voltage. When TOL = 0V, the 5% tolerance level is selected and when TOL = VCC, a 10%

tolerance level is selected.

GND

Ground pin, 0V reference.

RST

RST is asserted high if either VCC goes below the reset threshold, the watchdog times out or

PBRST is pulled low for a minimum of 20ms. RST remains asserted for one reset timeout

period after VCC exceeds the reset threshold or after the watchdog times out or after PBRST

goes high.

RST

RST is asserted low if either VCC goes below the reset threshold, the watchdog times out or

PBRST is pulled low for a minimum of 20ms. RST remains asserted for one reset timeout

period after VCC exceeds the reset threshold or after the watchdog times out or after PBRST

goes high. Open-drain output.

Input to the watchdog timer. If ST does not see a transition from high to low within the

watchdog timeout period, RST and RST will be asserted.

VCC

Power supply input.

Reset

Generator

VCC

RST

GND

Trip Point

Select

Ref

Manual Reset

Debounce

Watchdog

Timer

Timeout

Select

RST

TOL

PBRST

µP Supervisory Circuit

Preliminary

Pin Functions

Block Diagram

Impala Linear Corporation

(408) 574-3939

www.impalalinear.com

October 1999

ILC1832 1.1

ILC1832M Datasheet(PDF) 3 Page - Impala Linear Corporation

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