MAX6467US17D3-T(2015) 查看數據表（PDF） - Maxim Integrated

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MAX6467US17D3-T
(Rev.:2015)

Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset

Maxim Integrated 

MAX6467/MAX6468

Microprocessor Supervisory Reset Circuits

with Edge-Triggered, One-Shot Manual Reset

Reset Timeout Delay*

RESET TIMEOUT SUFFIX

D3

VCC RESET TIMEOUT PERIOD

(min/max) (ms)

150/300

MR TIMEOUT PERIOD

(min/max) (ms)

150/300

D7

1200/2400

150/300

*Additional reset timeout options may be available. Contact factory for availability.

MR RISING DEBOUNCE PERIOD

(min/max) (ms)

150/300

150/300

Applications Information

Falling VCC Transients

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

power-down, and brownout conditions, the MAX6467/

MAX6468 are relatively immune to short-duration fall-

ing VCC transients (glitches). The Typical Operating

Characteristics section shows the Maximum Transient

Duration vs. VCC Overdrive for which the MAX6467/

MAX6468 do not generate a reset pulse. This graph was

generated using a falling pulse applied to VCC starting

above the actual reset threshold and ending below the

threshold by the magnitude indicated (VCC Overdrive).

The graph indicates the typical maximum pulse width a

falling VCC transient can have without initiating a reset

pulse. As the magnitude of the transient increases (goes

farther below the reset threshold), the maximum allowable

pulse width decreases. A 0.1µF bypass capacitor from

VCC to GND provides additional transient immunity.

Ensuring a Valid RESET Output Down

to VCC = 0V

The MAX6467/MAX6468 guarantee proper operation

down to VCC = +1V. In applications that require valid

reset levels down to VCC = 0V, a pulldown resistor to

active-low outputs (MAX6468 only, Figure 3) ensures

that RESET remains valid while the RESET output can

no longer sink current. This scheme does not work with

the open-drain outputs of the MAX6467. Ensure that the

resistor value used does not overload the RESET output

when VCC is above the reset threshold. For most applica-

tions, use 100kΩ to 1MΩ.

VCC

1.5kΩ

MR

VCC

MAX6467

MAX6468

MR ONE-SHOT/

DEBOUNCE

RESET

TIMEOUT

PERIOD

VCC

1.23V

RESET

OUTPUT

RESET

GND

Figure 2. Functional Diagram

VCC

MAX6468

RESET

R1

100kΩ

GND

Figure 3. RESET Valid to VCC = 0V

Chip Information

TRANSISTOR COUNT: 748

PROCESS: BiCMOS

www.maximintegrated.com

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