MAX6328 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6328

3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits

Maxim Integrated 

MAX6326/MAX6327/

MAX6328/MAX6346/

MAX6347/MAX6348

3-Pin, Ultra-Low-Power SC70/SOT

μP Reset Circuits

Applications Information

Interfacing to µPs with

Bidirectional Reset Pins

Since the RESET output on the MAX6328/MAX6348 is

open drain, these devices interface easily with micropro-

cessors (µPs) that have bidirectional reset pins, such as

the Motorola 68HC11. Connecting the µP supervisor’s

RESET output directly to the microcontroller’s (µC’s)

RESET pin with a single pull-up resistor allows either

device to assert reset (Figure 1).

VCC

VCC

MAX6328

MAX6348

RESET

VCC

µP

MOTOROLA

68HCXX

RESET

INPUT

Negative-Going VCC Transients

In addition to issuing a reset to the µP during power-up,

power-down, and brownout conditions, these devices are

relatively immune to short-duration, negative-going VCC

transients (glitches).

The Typical Operating Characteristics show the Maxi-

mum Transient Duration vs. Reset Threshold Overdrive

graph, for which reset pulses are not generated. The

graph shows the maximum pulse width that a negative-

going VCC transient may typically have when issuing a

reset signal. As the amplitude of the transient increases,

the maximum allowable pulse width decreases.

GND

GND

Figure 1. Interfacing to μPs with Bidirectional Reset Pins

Table 1. Factory-Trimmed Reset Thresholds‡

PART

SUFFIX

MIN

RESET THRESHOLD VOLTAGE, VTH (V)

TA = +25°C

TA = -40°C to +85°C

TYP

MAX

MIN

MAX

MAX632_ _R 22

2.167

2.200

2.233

2.145

2.250

MAX632_ _R

23

2.285

2.320

2.355

2.262

2.375

MAX632_ _R

24

2.364

2.400

2.436

2.340

2.460

MAX632_ _R

25

2.462

2.500

2.537

2.437

2.562

MAX632_ _R

26

2.591

2.630

2.669

2.564

2.696

MAX632_ _R

27

2.660

2.700

2.741

2.633

2.768

MAX632_ _R 28

2.758

2.800

2.842

2.730

2.870

MAX632_ _R

29

2.886

2.930

2.974

2.857

3.000

MAX632_ _R 30

2.955

3.000

3.045

2.925

3.075

MAX632_ _R

31

3.034

3.080

3.126

3.003

3.150

MAX634_ _R

33

3.250

3.300

3.350

3.217

3.383

MAX634_ _R

34

3.349

3.400

3.451

3.315

3.485

MAX634_ _R 35

3.447

3.500

3.552

3.412

3.587

MAX634_ _R

36

3.546

3.600

3.654

3.510

3.690

MAX634_ _R 37

3.644

3.700

3.755

3.607

3.792

MAX634_ _R

38

3.743

3.800

3.857

3.705

3.895

‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.

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