SP706PCP datasheet(13/18 Pages) SIPEX

13 / 18 page

Date: 6-28-04

SP706 +3.0/ +3.3 Low Power Microprocessor Circuits

output is driven HIGH and the

µP wants to pull

it LOW, indeterminate logic levels may result.

To correct this, connect a 4.7k

Ω resistor

between the RESET output and the

µP reset

I/O, as shown if Figure 19.

Buffer the

RESET output to other system components.

Negative-Going V

CC Transients

While issuing resets to the

µP during power-up,

power-down, and brownout conditions, these

supervisors are relatively immune to short-

duration negative-going V

CC transients (glitches).

It is usually undesirable to reset the

µP when V

experiences only small glitches.

Figure 20 shows maximum transient dura-

tion vs. reset-comparator overdrive, for which

reset pulses are not generated. The data was gen-

erated using negative-going V

CC pulses, starting

at 3.3V and ending below the reset threshold by

Figure 18. Monitoring a Negative Voltage Supply

Figure 19. Interfacing to Microprocessors with

Bidirectional RESET I/O for the SP706

PFI

PFO

VCC

+3.3V/+3.0V

GND

PFO

V-

+3.3V

VTRIP

VCC - 1.25

1.25 - VTRIP

V-

100kΩ

RESET

to µP

2N3904

, VTRIP < 0

V-

+3.3V

the magnitude indicated (reset comparator over-

drive). The graph shows the maximum pulse

width a negative-going V

transient may

typically have without causing a reset pulse to

be issued. As the amplitude of the transient

increases (i.e. goes farther below the reset

threshold), the maximum allowable pulse width

decreases. Typically, a V

CC transient that goes

100mV below the reset threshold and lasts for

µs or less will not cause a reset pulse to be

issued. A 100nF bypass capacitor mounted close

to the V

CC pin provides additional transient

immunity.

Applications

The SP706P/R/S/T-SP708R/S/T series offers

unmatched performance and the lowest power

consumption for these industry standard de-

vices. Refer to Figures 21 and 22 for supply

current performance characteristics rated against

temperature and supply voltages.

VCC

+3.3V/+3.0V

GND

VCC

+3.3V/+3.0V

GND

RESET

4.7KΩ

µP

Buffered RESET connects to System Components

SP706PCP 数据表(PDF) 13 Page - Sipex Corporation

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