Datasheet

DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
5
Maxim Integrated
CS
CPHA = 1
SCLK
t
CC
t
DC
t
R
t
F
t
CCH
t
CWH
t
CDH
t
CL
t
CH
DIN
W/R
A6
A0
D0
WRITE ADDRESS BYTE
NOTE: SCLK CAN BE EITHER POLARITY SHOWN FOR CPOL = 1.
DOUT
D7
READ DATA BYTE
HIGH IMPEDANCE
Figure 2a. Timing Diagram—SPI Write Transfer (Mode 3)
CS
CPHA = 0
SCLK
t
CC
t
DC
t
R
t
F
t
CCH
t
CWH
t
CDH
t
CL
t
CH
DIN
W/R
A6
A0
D0
WRITE ADDRESS BYTE
NOTE: SCLK CAN BE EITHER POLARITY SHOWN FOR CPOL = 0.
DOUT
D7
READ DATA BYTE
HIGH IMPEDANCE
Figure 2b. Timing Diagram—SPI Write Transfer (Mode 0)