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SM8578 Datasheet(PDF) 4 Page - Nippon Precision Circuits Inc

Part # SM8578
Description  Real-time Clock IC
Download  13 Pages
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8578 Datasheet(HTML) 4 Page - Nippon Precision Circuits Inc

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SM8578BV
NIPPON PRECISION CIRCUITS INC.—4
Oscillator Characteristics
Ta = 25
°C, CG = 10pF, X’tal = NPC reference crystal (CI = 30kΩ, CL = 6pF) unless otherwise noted.
AC Characteristics
VSS = 0V, Ta = −40 to +85°C unless otherwise noted.
Parameter
Symbol
Condition
Rating
Unit
min
typ
max
Oscillator startup time
TSTA
VDD = 1.6V
5.0
s
Oscillator stop voltage
VSTO
1.5
V
Frequency voltage characteristic
f/V
VDD = 1.6 to 5.5V
−2
2
ppm/V
Frequency accuracy
εIC
VDD = 5.0V
−10
10
ppm
Output capacitance
CD
VDD = 5.0V
15
pF
Parameter
Symbol
Condition
VDD = 5.0V ± 10%
VDD = 3.0V ± 10%
Unit
min
typ
max
min
typ
max
CLK clock cycle
tCLK
600
1200
ns
CLK HIGH-level pulsewidth
tWH
300
600
ns
CLK LOW-level pulsewidth
tWL
300
600
ns
CE setup time
tCS
150
300
ns
CE hold time
tCH
200
400
ns
CE recovery time
tCR
300
600
ns
CLK hold time
tCKH
50
100
ns
Write data setup time
tDS
50
100
ns
Write data hold time
tDH
50
100
ns
Read data output delay time
tRD
CL = 50pF
200
400
ns
Output disable delay time
tRZ
CL = 50pF
RL = 10kΩ
100
200
ns
Input rise and fall time
tRF
20
40
ns
Abnormal oscillation detection
time
tOSC
10
10
ms


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