User Manual

MAX6901
3-Wire Serial RTC in a TDFN
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Note 1: All parameters are 100% tested at T
A
= +25°C. Limits over temperature are guaranteed by design and not production tested.
Note 2: I
CC
is specified with the I/O grounded, CS high, SCLK = 2MHz at V
CC
= +5V; SCLK = 500kHz at V
CC
= +2.0V, 32kHz output
enabled, and no load on 32kHz output.
Note 3: Timekeeping current is specified with CS = GND, SCLK = GND, I/O = GND, 32kHz = GND, and 32kHz disabled.
Note 4: All values referred to V
IH
min and V
IL
max levels.
Note 5: Guaranteed by design. Not production tested.
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.0V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.) (Figures 4, 5
and Notes 1, 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OSCILLATOR
X1 to Ground Capacitance (Note 5) 25 pF
X2 to Ground Capacitance (Note 5) 25 pF
3-WIRE SERIAL TIMING
V
CC
= +2V 200
Data to CLK Setup t
DC
V
CC
= +5V 50
ns
V
CC
= +2V 280
CLK to Data Hold t
CDH
V
CC
= +5V 70
ns
V
CC
= +2V 800
CLK to Data Delay t
CDD
C
L
= 50pF
V
CC
= +5V 200
ns
V
CC
= +2V 1000
CLK Low Time t
CL
V
CC
= +5V 250
ns
V
CC
= +2V 1000
CLK High Time t
CH
V
CC
= +5V 250
ns
V
CC
= +2V DC 0.5
CLK Frequency f
CLK
V
CC
= +5V DC 2.0
MHz
V
CC
= +2V 2000
CLK Rise and Fall Time t
R
, t
F
V
CC
= +5V 500
ns
V
CC
= +2V 4
CS to CLK Setup t
CC
V
CC
= +5V 1
µs
V
CC
= +2V 240
CLK to CS Hold t
CCH
V
CC
= +5V 60
ns
V
CC
= +2V 4
CS Inactive Time t
CWH
V
CC
= +5V 1
µs
V
CC
= +2V 0 280
CS to I/O High Z t
CDZ
R
L
= 1kΩ, C
L
= 60pF
V
CC
= +5V 0 70
ns
V
CC
= +2V 0 280
SCLK to I/O High Z t
CCZ
R
L
= 1kΩ, C
L
= 60pF
V
CC
= +5V 0 70
ns