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MAX6348XR33-T
(Rev.:2000)

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

Maxim Integrated 

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 micro-

processors (µPs) that have bidirectional reset pins,

such as the Motorola 68HC11. Connecting the µP

supervisor’s RESET output directly to the microcon-

troller’s (µC’s) RESET pin with a single pull-up resistor

allows either device to assert reset (Figure 1).

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 increas-

es, the maximum allowable pulse width decreases.

VCC

VCC

MAX6328

MAX6348

RESET

VCC

µP

MOTOROLA

RESET 68HCXX

INPUT

GND

GND

Figure 1. Interfacing to µPs with Bidirectional Reset Pins

Table 1. Factory-Trimmed Reset Thresholds‡

PART

SUFFIX

MAX632_ _R

22

MAX632_ _R

23

MAX632_ _R

24

MAX632_ _R

25

MAX632_ _R

26

MAX632_ _R

27

MAX632_ _R

28

MAX632_ _R

29

MAX632_ _R

30

MAX632_ _R

31

MAX634_ _R

33

MAX634_ _R

34

MAX634_ _R

35

MAX634_ _R

36

MAX634_ _R

37

MAX634_ _R

38

MIN

2.167

2.285

2.364

2.462

2.591

2.660

2.758

2.886

2.955

3.034

3.250

3.349

3.447

3.546

3.644

3.743

RESET THRESHOLD VOLTAGE, VTH (V)

TA = +25°C

TYP

MAX

TA = -40°C to +85°C

MIN

MAX

2.200

2.233

2.145

2.250

2.320

2.355

2.262

2.375

2.400

2.436

2.340

2.460

2.500

2.537

2.437

2.562

2.630

2.669

2.564

2.696

2.700

2.741

2.633

2.768

2.800

2.842

2.730

2.870

2.930

2.974

2.857

3.000

3.000

3.045

2.925

3.075

3.080

3.126

3.003

3.150

3.300

3.350

3.217

3.383

3.400

3.451

3.315

3.485

3.500

3.552

3.412

3.587

3.600

3.654

3.510

3.690

3.700

3.755

3.607

3.792

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.

4 _______________________________________________________________________________________

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