ing (sourcing) capabilities decline drastically. In the

case of the MAX6412, MAX6415, and MAX6418, high-

impedance CMOS-logic inputs connected to RESET

can drift to undetermined voltages. This presents no

problems in most applications, since most µPs and

In those applications where RESET must be valid down

to 0, adding a pulldown resistor between RESET and

ground sinks any stray leakage currents, holding

RESET low (Figure 6). The value of the pulldown resis-

tor is not critical; 100k

Ω is large enough not to load

RESET and small enough to pull RESET to ground. For

applications using the MAX6413, MAX6416, and

MAX6419, a 100k

Ω pullup resistor between RESET and

(Figure 7). Open-drain RESET versions are not recom-

down to 0V.

Layout Consideration

SRT is a precise current source. When developing the

layout for the application, be careful to minimize board

capacitance and leakage currents around this pin.

Traces connected to SRT should be kept as short as

possible. Traces carrying high-speed digital signals

Low-Power, Single/Dual-Voltage µP Reset Circuits

with Capacitor-Adjustable Reset Timeout Delay

_______________________________________________________________________________________

9

Table 1. Reset Voltages Suffix Table

SUFFIX

MIN

TYP

MAX

16

1.536

1.575

1.614

17

1.623

1.665

1.707

18

1.755

1.800

1.845

19

1.853

1.900

1.948

20

1.950

2.000

2.050

21

2.048

2.100

2.153

22

2.133

2.188

2.243

23

2.313

2.313

2.371

24

2.340

2.400

2.460

25

2.438

2.500

2.563

26

2.559

2.625

2.691

27

2.633

2.700

2.768

28

2.730

2.800

2.870

29

2.852

2.925

2.998

30

2.925

3.000

3.075

31

2.998

3.075

3.152

32

3.120

3.200

3.280

33

3.218

3.300

3.383

34

3.315

3.400

3.485

35

3.413

3.500

3.558

36

3.510

3.600

3.690

37

3.608

3.700

3.793

38

3.705

3.800

3.895

39

3.803

3.900

3.998

40

3.900

4.000

4.100

41

3.998

4.100

4.203

42

4.095

4.200

4.305

43

4.193

4.300

4.408

44

4.266

4.375

4.484

45

4.388

4.500

4.613

46

4.509

4.625

4.741

47

4.583

4.700

4.818

48

4.680

4.800

4.920

49

4.778

4.900

5.023

50

4.875

5.000

5.125