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Low-Current, SPI-Compatible
Real-Time Clock
Maxim Integrated
3
DS1347
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.0V to +5.5V, TA = -40
°C to +85°C. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.)
(Figure 5, Notes 1, 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SPI SERIAL TIMING
Input Rise Time
trIN
DIN, SCLK,
CS
5
ns
Input Fall Time
tfIN
DIN, SCLK,
CS
5
ns
Output Rise Time
trOUT
DOUT, CLOAD = 100pF
10
ns
Output Fall Time
tfOUT
DOUT, CLOAD = 100pF
10
ns
VCC = +2V
1000
SCLK Period
tCP
VCC = +5V
238
ns
SCLK High Time
tCH
100
ns
SCLK Low Time
tCL
100
ns
VCC = +2V, CLOAD = 100pF
300
SCLK Fall to DOUT
Valid
tDO
VCC = +5V, CLOAD = 100pF
100
ns
DIN to SCLK Setup
Time
tDS
100
ns
DIN to SCLK Hold
Time
tDH
20
ns
VCC = +2V
200
SCLK Rise to
CS
Rise Hold Time
tCSH
VCC = +5V
50
ns
CS High Pulse Width
tCSW
200
ns
CS High to DOUT
High Impedance
tCSZ
100
ns
CS to SCLK Setup
Time
tCSS
100
ns
CRYSTAL CHARACTERISTICS
Note 1: All parameters are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design and characterization and
not production tested.
Note 2: ICC is specified with DOUT open, CS = DIN = GND, SCLK = 4MHz at VCC = +5V; SCLK = 1MHz at VCC = +2.0V.
Note 3: Timekeeping current is specified with CS = VCC, SCLK = DIN = GND, DOSF = 0, EGFIL = 1.
Note 4: Guaranteed by design and not 100% production tested.
Note 5: All values referred to VIH(MIN) and VIL(MAX) levels.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Nominal Frequency
fO
32.768
kHz
Series Resistance
ESR
100
k
Load Capacitance
CL
12.5
pF
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