Microprocessor Voltage Monitors

with Programmable Voltage Detection

________________________________________________________________________________________

3

Note 1: The maximum output current of the MAX8211 is limited by design to 30mA under any operating condition. The output voltage

may be sustained at any voltage up to +16.5V as long as the maximum power dissipation of the device is not exceeded.

Note 2: The maximum output current of the MAX8212 is not defined, and systems using the MAX8212 must therefore ensure that the

output current does not exceed 50mA and that the maximum power dissipation of the device is not exceeded.

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

UNITS

0.17

0.4

Output Saturation Voltage

0.17

0.4

V

4

7.0

Maximum Available

Output Current

C temp. range,

12

35

mA

0.1

0.1

Hysteresis Leakage

Current

3

3

µA

Hysteresis Saturation

Voltage

(MAX)

measured with respect to V+

-0.1

-0.2

-0.1

-0.2

V

Maximum Available

Hysteresis Current

(MAX)

210

210

mA

MAX8212

MIN TYP MAX

MAX8211

MIN TYP MAX

_______________Detailed Description

As shown in the block diagrams of Figures 1 and 2, the

MAX8211 and MAX8212 each contain a 1.15V refer-

ence, a comparator, an open-drain n-channel output

transistor, and an open-drain p-channel hysteresis out-

put. The MAX8211 output n-channel turns on when the

voltage applied to the THRESH pin is less than the

internal reference (1.15V). The sink current is limited to

7mA (typical), allowing direct drive of an LED without a

series resistor. The MAX8212 output turns on when the

voltage applied to THRESH is greater than the internal

reference. It is not current limited, and will typically sink

35mA.

Compatibility with ICL8211/ICL8212

The CMOS MAX8211/MAX8212 are plug-in replacements

for the bipolar ICL8211/ICL8212 in most applications.

The use of CMOS technology has several advantages.

The quiescent supply current is much less than in the

bipolar parts. Higher-value resistors can also be used

P

N

1.15V

REFERENCE

HYST

OUT

THRESH

V+

Figure 1. MAX8211 Block Diagram