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R2051 Datasheet(PDF) 5 Page - RICOH electronics devices division

Part No. R2051
Description  2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R2051 Datasheet(HTML) 5 Page - RICOH electronics devices division

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R2051 Series
5
ABSOLUTE MAXIMUM RATINGS
(VSS=0V)
Symbol
Item
Pin Name
Description
Unit
VCC
Supply Voltage 1
VCC
-0.3 to +6.5
V
VDD
Supply Voltage 2
VDD
-0.3 to +6.5
V
VSB
Supply Voltage 3
VSB
-0.3 to +6.5
V
Input Voltage 1
SCL, SDA
-0.3 to +6.5
V
VI
Input Voltage 2
CIN
-0.3 to VDD+0.3
V
Output Voltage 1
INTR , VDCC *1)
-0.3 to +6.5
V
VO
Output Voltage 2
CLKOUT
-0.3 to VCC+0.3
V
IOUT
Maximum Output Current
VDD
10
mA
PD
Power Dissipation
Topt = +25
°C
300
mW
Topt
Operating Temperature
-40 to +85
°C
Tstg
Storage Temperature
-55 to +125
°C
*1) Except R2051Txx
RECOMMENDED OPERATING CONDITIONS
(VSS=0V, Topt=-40 to +85
°C)
Symbol
Item
Pin Name
Min,
Typ.
Max.
Unit
Vaccess
Supply Voltage
VCC power supply
voltage for interfacing
with CPU
-VDET1
*1)
5.5
V
VCLK
Minimum Timekeeping
Voltage
CGout,CDout=0pF
*2), *3)
0.75
1.00
V
fXT
Oscillation Frequency
32.768
kHz
VPUP
Pull-up Voltage
INTR , VDCC *4)
5.5
V
*1) -VDET1 in Vaccess specification is guaranteed by design.
*2) CGout is connected between OSCIN and VSS, CDout is connected between OSCOUT and VSS.
R2051 series incorporates the capacitors between OSCIN and VSS, between OSCOUT and VSS.
Then normally, CGout and CDout are not necessary.
*3) Quartz crystal unit: CL=6-8pF, R1=30K
*4) Except R2051Txx


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