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V3021 Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA

Part # V3021
Description  Ultra Low Power 1-Bit 32 kHz RTC
PDF  15 Pages
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

V3021 Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA

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V3021
Copyright © 2005, EM Microelectronic-Marin SA
5
www.emmicroelectronic.com
Timing Characteristics (standard temperature range)
VSS= 0V and TA=-40 to +85°C, unless otherwise specified
Parameter
Symbol
Test Conditions
Min.
Max.
Min.
Typ.
Max.
Unit
VDD ≥ 2V
VDD = 5.0V ±10%
Chip select duration
tCS
Write cycle
200
50
ns
RAM access time (note 1)
tACC
CLOAD = 50pF
180
50
60
ns
Time between two transfers
tW
500
100
ns
Rise time (note 2)
tR
10
200
10
200
ns
Fall time (note 2)
tF
10
200
10
200
ns
Data valid to Hi-impedance (note 3)
tDF
10
100
15
30
40
ns
Write data settle time (note 4)
tDW
60
50
ns
Data hold time (note 5)
tDH
80
25
ns
Advance write time
tADW
25
10
ns
Write pulse time (note 6)
tWC
200
50
ns
Table 4
Timing Characteristics (standard temperature range)
VSS= 0V and TA=-40 to +125°C, unless otherwise specified
Parameter
Symbol
Test Conditions
Min.
Max.
Min.
Typ.
Max.
Unit
VDD ≥ 2V
VDD = 5.0V ±10%
Chip select duration
tCS
Write cycle
200
60
ns
RAM access time (note 1)
tACC
CLOAD = 50pF
180
50
60
ns
Time between two transfers
tW
500
120
ns
Rise time (note 2)
tR
10
100
10
100
ns
Fall time (note 2)
tF
10
100
10
100
ns
Data valid to Hi-impedance (note 3)
tDF
10
100
5
30
50
ns
Write data settle time (note 4)
tDW
60
50
ns
Data hold time (note 5)
tDH
80
25
ns
Advance write time
tADW
25
15
ns
Write pulse time (note 6)
tWC
200
60
ns
Table 4 ex.
Note 1
: tACC starts from RD or CS , whichever activates last
Typically, tACC = 5 + 0.9 CEXT in ns; where CEXT (external parasitic capacitance) is in pF
Note 2
: CS ,
RD , DS , WR and R/ W rise and fall times are specified by tR and tF
Note 3
: tDF starts from RD or CS , whichever deactivates first
Note 4
: tDW ends at WR or CS , whichever deactivates first
Note 5
: tDH starts from WR or CS , whichever deactivates first
Note 6
: tWC starts from WR or CS , whichever activates last and ends at WR or CS , whichever deactivates first



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