MAX8215C/D(1993) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8215C/D
(Rev.:1993)

±5V, ±12V (±15V) Dedicated Microprocessor Voltage Monitors

Maxim Integrated 

±5V, ±12V (±15V) Dedicated

Microprocessor Voltage Monitors

_____________________Pin Description

PIN

1

2

3

4

5

6

7

8

9

10, 11,

12, 13

14

NAME

VREF

GND

+5V

-5V

+12V

(+15V)

-12V

(-15V)

DIN

PGND

DOUT

OUT4,

OUT3,

OUT2,

OUT1

VDD

FUNCTION

Output of the internal 1.24V reference

Ground. Connect to PGND.

Input for monitoring +5V supply

Input for monitoring -5V supply

MAX8215 input for monitoring +12V

(MAX8216 input for monitoring +15V)

MAX8215 input for monitoring -12V

(MAX8216 input for monitoring -15V)

Noninverting input of the auxiliary

comparator. Its inverting input is tied

to the internal reference.

Power-supply ground. Bypass VDD

to this pin.

Output of the auxiliary comparator

Outputs of the four dedicated com-

parators

Power-supply positive voltage input.

Bypass to PGND.

+5V

-5V

+12V (+15V)

-12V (-15V)

DIN

( ) ARE FOR

MAX8216 ONLY.

OUT1

MAX8215

MAX8216

OUT2

OUT3

OUT4

DOUT

1.24V REFERENCE

VREF

VDD

PGND

GND

Figure 1. Block Diagram

_______________Detailed Description

The MAX8215/MAX8216 contain 5 comparators (Figure

1). The comparator with its output labeled DOUT is dis-

tinguished from the others in that it can be set up to mon-

itor various voltages; each of the other 4 comparators

monitors a specific voltage. The DOUT comparator’s

noninverting input is available external to the device; its

inverting input is tied internally to the reference.

The MAX8215/MAX8216 comparators have open-drain

outputs. Thus, these devices require pull-up resistors

for proper operation. See the Typical Operating Circuit.

Open-drain outputs are useful for driving LEDs and for

situations in which the comparator outputs must be

connected together (i.e., wire-ORed).

Bypass VDD with 0.1µF connected to PGND.

__________Applications Information

Hysteresis

When the voltage on a typical comparator’s input is

at or near the voltage on the other input, ambient

noise generally causes the comparator output to

oscillate. The most common way to eliminate this

problem is by using hysteresis. When the two com-

parator input voltages are equal, hysteresis causes

one comparator input voltage to move quickly past

the other, thus taking the input out of the region

where oscillation occurs. Standard comparators

need external resistors for hysteresis; these resistors

are not necessary when using any of the MAX8215

and MAX8216 comparators because hysteresis is

built in.

6 _______________________________________________________________________________________

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