________________________________________________________________________

http://www.union-ic.com Rev.01 Jan.2015

3/14

UM805/811/812

Pin Description

Pin

Number

Pin Name

Function

1

GND

Ground

2

RESET

______________

(UM805/811)

Active-Low Reset Output. RESET

_____________

the reset threshold or while MR

_______

is held low. It remains low for the

terminated. See Figure 1.

UM811:

CMOS push-pull output (sources and sinks current)

UM805:

Open-drain, active low, NMOS output (sinks current only). Connect a

pull-up resistor from RESET

______________

to any supply voltage up to 6V.

RESET

(UM812)

the reset threshold or while MR

_______

is held low. RESET remains high for

terminated.

3

MR

_______

Manual Reset Input. A logic low on MR

_______

asserts reset. Reset remains

asserted as long as MR

_______

is low and for 240ms after MR

_______

returns high.

This active-low input has an internal 20kΩ pull-up resistor. It can be

driven from a TTL or CMOS-logic line, or shorted to ground with a

switch. Leave open if unused. See Figure 2.

4

+5V, +3.3V, or +3V Supply Voltage

Absolute Maximum Ratings (Note 1)

Symbol

Parameter

Value

Unit

Supply Voltage

-0.3 to +6.0

V

RESET, RESET

_____________

(push-pull)

RESET

_____________

(open-drain)

-0.3 to +6.0

_______

20

mA

Output Current, RESET, RESET

_____________

20

mA

Continuous Power Dissipation (Derate 4mW/°C above

70°C)

320

mW

Operating Temperature Range

-40 to +105

°C

Storage Temperature Range

-65 to +160

°C

Lead Temperature (soldering, 10s)

+300

°C

Note 1: Stresses beyond those listed under “Absolute maximum Ratings” may cause permanent

damage to the device. These are stress ratings only and functional operation of the device at these or

any other conditions beyond those indicated in the operational sections of the specifications are not

implied. Exposure to absolute maximum rating conditions for extended periods may affect device

reliability.