SP705 datasheet(12/17 Pages) EXAR

12 / 17 page

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Fig. 23: Interfacing to Microprocessors

with Bidirectional REST I/O (SP705/706/708)

APPLICATIONS

The SP705-708/813L series offers unmatched

performance

and

the

lowest

power

consumption for these industry standard

devices. Refer to Figures 24 and 25 for supply

current

performance

characteristics

rated

against temperature and supply voltages.

Table 2 shows how the SP705-708/813L series

can

used

instead

the

Dallas

Semiconductor

DS1232LP/LPS.

Table

illustrates to a designer the advantages and

tradeoffs

the

SP705-708/813L

series

compared to the Dallas Semiconductor device.

While the names of the pin descriptions may

differ, the functions are the same or very

similar. Unlike the DS1232, the SP705-

708/813L series has a separate watchdog

output pin WDO which can be simply

connected to the MR input to generate a Reset

signal.

The

DS1232

has

selectable

features, while the SP705-708/813L series has

more fixed functions of reset threshold and

watchdog

time-out

delay.

For

most

applications, the fixed functions will be

preferred, with the benefit of reduced cost due

to a less complex part. In addition, the SP705-

708/ 813L series has a power fail input and

output function not available with the DS1232

that is useful for monitoring systems with

unregulated supply voltages. The SP705-

708/813L series is available in one of the

industry's

smallest

space-saving

package

sizes, the MSOP.

Fig. 24: Supply Current vs. Temperature

Fig. 25: Supply Current vs. Supply Voltage

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