AS1916R-T datasheet(2/13 Pages) AMSCO

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AS1916 - AS1918

Data Sheet - P i n o u t

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 2. Pin Descriptions

Number

Name

Description

RESETN

Active-Low Reset Output (AS1916, AS1918). The RESETN signal toggles from high to low

when VCC, or MRN is pulled low, or the watchdog triggers a reset. This output signal remains

low for the reset timeout period after all supervised voltages exceed their reset threshold, or

MRN goes low to high, or the watchdog triggers a reset.

RESET

Active-High Reset Output (AS1917). The RESET signal toggles from low to high when

VCC, or MRN is pulled low, or the watchdog triggers a reset. This output signal remains high

for the reset timeout period (see tRP on page 4) after all supervised voltages exceed their

reset threshold, or MRN goes low to high, or the watchdog triggers a reset.

2GND

Ground

3MRN

Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is connected

to the internal 50k

Ω pullup to VCC. This reset remains active as long as MRN is low and for

the reset timeout period (see tRP on page 4) after MRN goes high.

Note: If the manual reset feature is not used, this pin should be unconnected or connected

to VCC.

4WDI

Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period

(see tWD on page 5), the internal watchdog timer period expires and a reset is triggered for

the reset timeout period (see tRP on page 4). The internal watchdog timer clears whenever a

reset is a asserted or when WDI senses a rising or falling edge.

Note: To disable the watchdog feature, this pin must be unconnected or connected to a tri-

state buffer output.

5VCC

Supervised Voltage Input. This pin serves as the supervised supply voltage input.

AS1916 -

AS1918

GND

MRN

RESETN/RESET

4 WDI

5 VCC

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