SM8577BS Просмотр технического описания (PDF) - Nippon Precision Circuits

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SM8577BS

Real-time Clock IC

Nippon Precision Circuits  

Timing Diagrams

Data read

CE

CLK

DATA

Data write

tCES

tCLK

t t CLKH CLKL

tDATD

CE

CLK

DATA

tCES

tCLK

t t CLKH CLKL

tsD

tHD

SM8577B

tCE

t t f1

r1

tCE

t t r1

f1

FOUT output

FOUT

tr2

10%

tH

90%

tr2

t

Note that the 1 Hz and 32 kHz oscillators are not

synchronized to each other, so switching between 1

Hz and 32 kHz output temporarily shortens the duty

cycle. Accordingly, a wait time (≥ output frequency

period) should be incorporated when switching

during normal operation.

t t CEH

RCV

tDZ

t t CEH RCV

50%

Duty=

tH

t

X

100(%)

NIPPON PRECISION CIRCUITS—7

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