DS1390U-18 Maxim Integrated Products, DS1390U-18 Datasheet - Page 4

• Manufacturer Part Number: DS1390U-18
• Description: Real Time Clock Low-Voltage SPI RTC with Trickle Charger
• Manufacturer: Maxim Integrated Products

Specifications of DS1390U-18

• Function: Clock, Calendar, Alarm, Trickle Charger
• Supply Voltage (max): 1.89 V
• Supply Voltage (min): 1.71 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: uSOP
• Time Format: HH:MM:SS:hh

Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
Figure 1a. Timing Diagram—SPI Read Transfer (Mode 3)
Figure 1b. Timing Diagram—SPI Read Transfer (Mode 0)
4
CPHA = 1
CPHA = 0
DOUT
SCLK
SCLK
DOUT
_____________________________________________________________________
NOTE: SCLK CAN BE EITHER POLARITY SHOWN FOR CPOL = 1.
NOTE: SCLK CAN BE EITHER POLARITY SHOWN FOR CPOL = 0.
DIN
CS
DIN
CS
t
DC
t
CC
t
CC
t
DC
W/R
W/R
t
CDH
t
CDH
t
t
CL
R
t
t
R
CL
WRITE ADDRESS BYTE
HIGH IMPEDANCE
WRITE ADDRESS BYTE
HIGH IMPEDANCE
A6
t
A6
CH
t
CH
t
F
t
F
A0
A0
t
CDD
t
CDD
D7
D7
READ DATA BYTE
READ DATA BYTE
D0
D0
t
t
CDZ
CDZ