DS1346 Datasheet, PDF (3/17 Pages) Maxim Integrated Products – Low-Current, SPI-Compatible Real-Time Clocks

Low-Current, SPI-Compatible Real-Time Clocks
AC ELECTRICAL CHARACTERISTICS
(V_CC = +2.0V to +5.5V, T_A = -40°C to +85°C. Typical values are at V_CC = +3.3V, T_A = +25°C, unless otherwise noted.) (Figure 5,
Notes 1, 5)
PARAMETER
SPI SERIAL TIMING
Input Rise Time
Input Fall Time
Output Rise Time
Output Fall Time
SCLK Period
SCLK High Time
SCLK Low Time
SCLK Fall to DOUT
Valid
DIN to SCLK Setup
Time
SYMBOL
CONDITIONS
t_rIN
t_fIN
t_rOUT
t_fOUT
t_CP
t_CH
t_CL
t_DO
t_DS
DIN, SCLK, CS
DIN, SCLK, CS
DOUT, C_LOAD = 100pF
DOUT, C_LOAD = 100pF
V_CC = +2V
V_CC = +5V
V_CC = +2V, C_LOAD = 100pF
V_CC = +5V, C_LOAD = 100pF
MIN
TYP MAX UNITS
5
ns
5
ns
10
ns
10
ns
1000
ns
238
100
ns
100
ns
300
ns
100
100
ns
DIN to SCLK Hold
Time
SCLK Rise to CS
Rise Hold Time
CS High Pulse Width
CS High to DOUT
High Impedance
CS to SCLK Setup
Time
t_DH
t_CSH
t_CSW
t_CSZ
V_CC = +2V
V_CC = +5V
t_CSS
20
ns
200
ns
50
200
ns
100
ns
100
ns
CRYSTAL CHARACTERISTICS
PARAMETER
Nominal Frequency
Series Resistance
Load Capacitance
SYMBOL
f_O
ESR
C_L
DS1346
DS1347
CONDITIONS
MIN
TYP MAX UNITS
32.768
kHz
100
k

6
pF
12.5
Note 1: All parameters are 100% tested at T_A = +25°C. Limits over temperature are guaranteed by design and characterization and
not production tested.
Note 2: I_CC is specified with DOUT open, CS = DIN = GND, SCLK = 4MHz at V_CC = +5V; SCLK = 1MHz at V_CC = +2.0V.
Note 3: Timekeeping current is specified with CS = V_CC, SCLK = DIN = GND, DOSF = 0, EGFIL = 1.
Note 4: Guaranteed by design and not 100% production tested.
Note 5: All values referred to V_IH(MIN) and V_IL(MAX) levels.
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