SM8577BS Просмотр технического описания (PDF) - Nippon Precision Circuits

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SM8577BS

Real-time Clock IC

Nippon Precision Circuits  

SM8577B

AC Characteristics

VDD = 5 V ± 10%, VSS = 0 V, Ta = −40 to 85 °C, CL = 50 pF unless otherwise noted

Parameter

CLK clock period

CLK LOW-level pulsewidth

CLK HIGH-level pulsewidth

CE setup time

CE hold time

CE enable time

Write data setup time

Write data hold time

DATA output delay time

DATA output floating time

Clock rise time

Clock fall time

FOUT rise time

FOUT fall time

FOUT duty cycle

Wait time

Symbol

Condition

Rating

Unit

min

max

min

tCLK

0.75

–

7800

µs

tCLKL

0.375

–

3900

µs

tCLKH

0.375

–

3900

µs

tCES

0.375

–

3900

µs

tCEH

0.375

–

–

µs

tCE

–

–

0.9

s

tSD

0.1

–

–

µs

tHD

0.1

–

–

µs

tDATD

–

–

0.2

µs

tDZ

See measurement circuit.

–

–

0.1

µs

tr1

–

–

50

ns

tf1

–

–

50

ns

tr2

CL = 30 pF

–

–

100

ns

tf2

CL = 30 pF

–

–

100

ns

Duty

CL = 30 pF, 32 kHz output

40

–

60

%

tRCV

0.95

–

–

µs

VDD = 3 V ± 10%, VSS = 0 V, Ta = −40 to 85 °C, CL = 50 pF unless otherwise noted

Parameter

CLK clock period

CLK LOW-level pulsewidth

CLK HIGH-level pulsewidth

CE setup time

CE hold time

CE enable time

Write data setup time

Write data hold time

DATA output delay time

DATA output floating time

Clock rise time

Clock fall time

FOUT rise time

FOUT fall time

FOUT duty cycle

Wait time

Symbol

Condition

Rating

Unit

min

max

min

tCLK

1.5

–

7800

µs

tCLKL

0.75

–

3900

µs

tCLKH

0.75

–

3900

µs

tCES

0.75

–

3900

µs

tCEH

0.75

–

–

µs

tCE

–

–

0.9

s

tSD

0.2

–

–

µs

tHD

0.1

–

–

µs

tDATD

–

–

0.4

µs

tDZ

See measurement circuit.

–

–

0.2

µs

tr1

–

–

100

ns

tf1

–

–

100

ns

tr2

CL = 30 pF

–

–

200

ns

tf2

CL = 30 pF

–

–

200

ns

Duty

CL = 30 pF, 32 kHz output

40

–

60

%

tRCV

1.9

–

–

µs

NIPPON PRECISION CIRCUITS—5

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