Reset Threshold

The MAX814/MAX815 have fixed, factory-set reset

thresholds, signified by the first suffix letter in the part

number (see Figure 7 for more information on reset

ranges). The MAX816 has an adjustable reset threshold.

MAX814/MAX815 K-suffix parts have a minimum reset

threshold set to 4.75V, worst case. They are intended

for 5.0V systems with a ±4% or better power-supply tol-

erance design that must meet worst-case system para-

meters over time, temperature, line, and load variations.

The “K” series 1%-tolerance reset threshold allows a

larger range of power-supply tolerance. System ICs

that have a tight operating supply range, like the

386/486 µPs, need a RESET initiated at a minimum

threshold of 4.75V, worst case.

L-suffix parts have a minimum reset threshold set to

4.65V, worst case. They are intended for 5.0V systems

with a ±5% power-supply tolerance. Typically, the reset

threshold is less than or equal to the minimum power-

supply voltage, allowing system operation over the

complete power-supply range. A reset is initiated at

4.75V maximum. The 1% “L” version maximizes the

System IC Guard-Band Range.

N-suffix parts have a minimum reset threshold set to

4.50V, worst case. They are intended for 5.0V systems

with a ±10% IC system. Typically, the reset threshold

±1% Accuracy, Low-Power, +3V and +5V

µP Supervisory Circuits

10

______________________________________________________________________________________

4.5

4.75

4.85

5.0

5.25

5.5V

IC OPERATING RANGE

RESET LIMITS “K”

(4.8V ±1%)

POWER-SUPPLY RANGE

(5.05V ±2%)

DESIGNED TO MEET WORST-

CASE DESIGN PARAMETERS.

4.5

4.75

4.65

5.0

5.25

5.5V

IC OPERATING RANGE

RESET LIMITS “L”

(4.7V ±1%)

POWER-SUPPLY RANGE

(5V ±5%)

DESIGNED TO ALLOW OPERATION

OVER THE FULL POWER-SUPPLY RANGE.

4.5

4.75

4.60

5.0

5.25

5.5V

IC OPERATING RANGE

RESET LIMITS “N”

(4.55V ±1%)

POWER-SUPPLY RANGE

(5V ±5%)

DESIGNED TO MEET WORST-

CASE DESIGN PARAMETERS.

3.0

3.06

3.3

3.6V

IC OPERATING RANGE

RESET LIMITS “T”

(3.03V ±1%)

POWER-SUPPLY RANGE

(3.33V ±0.26%)

DESIGNED TO MEET WORST-

CASE DESIGN PARAMETERS.

Figure 7a. K Suffix Design Range

Figure 7b. L Suffix Design Range

Figure 7c. N Suffix Design Range

Figure 7d. T Suffix Design Range