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DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
Real-Time Clocks
_____________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS
(VCC = 0V, VBAT = 3.0V, TA = Over the operating range, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VBAT or VBAUX Current (Oscillator
On); TA = +25°C, VBAT = 3.0V
IBAT
(Note 7)
500
700
nA
VBAT or VBAUX Current
(Oscillator Off)
IBATDR
(Note 7)
50
400
nA
AC ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, TA = Over the operating range, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Cycle Time
tCYC
240
DC
ns
Pulse Width, RD or WR Low
PWRWL
120
ns
Pulse Width, RD or WR High
PWRWH
80
ns
Input Rise and Fall
tR, tF
30
ns
Chip-Select Setup Time Before
RD or WR
tCS
20
ns
Chip-Select Hold Time
tCH
0ns
Read-Data Hold Time
tDHR
10
50
ns
Write-Data Hold Time
tDHW
0ns
Address Setup Time to ALE Fall
tASL
20
ns
Address Hold Time to ALE Fall
tAHL
10
ns
RD or WR High Setup to ALE
Rise
tASD
25
ns
Pulse Width ALE High
PWASH
40
ns
Delay Time ALE Low to RD Low
tASED
30
ns
Output Data Delay Time from RD
tDDR
(Note 8)
20
120
ns
Data Setup Time
tDSW
30
ns
IRQ Release from RD
tIRD
2s
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