Datasheet

(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at nominal supply voltage and T
A
= +25°C,
unless otherwise noted.) (Note 1)
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Standby Current
(Note 11)
I
CCS
-33 115 175
µA-3 80 125
-18 60 100
V
BACKUP
Leakage Current
(V
BACKUP
= 3.7V,
V
CC
= V
CC(MAX)
)
I
BACKUPLKG
15 100 nA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BACKUP
Current OSC On,
SQW O󰀨
I
BACKUP1
(Note 12) 500 1000 nA
V
BACKUP
Current OSC On,
SQW On (32kHz)
I
BACKUP2
(Note 12) 600 1150 nA
V
BACKUP
Current OSC On,
SQW On, V
BACKUP
= 3.0V,
T
A
= +25°C
I
BACKUP3
(Note 12) 600 1000 nA
V
BACKUP
Current, OSC O󰀨
(Data Retention)
I
BACKUPDR
(Note 12) 25 100 nA
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
SCLK Frequency (Note 13) f
SCLK
2.7V ≤ V
CC
≤ 5.5V 0 4
MHz
1.71V ≤ V
CC
≤ 1.89V 0 1
Data to SCLK Setup t
DC
(Notes 13, 14) 30 ns
SCLK to Data Hold t
CDH
(Notes 13, 14) 30 ns
SCLK to Data Valid
(Notes 13, 14, 15)
t
CDD
2.7V ≤ V
CC
≤ 5.5V 80
ns
1.71V ≤ V
CC
≤ 1.89V 160
SCLK Low Time (Note 13) t
CL
2.7V ≤ V
CC
≤ 5.5V 110
ns
1.71V ≤ V
CC
≤ 1.89V 400
SCLK High Time (Note 13) t
CH
2.7V ≤ V
CC
≤ 5.5V 110
ns
1.71V ≤ V
CC
≤ 1.89V 400
SCLK Rise and Fall t
R
, t
F
200 ns
CS to SCLK Setup (Note 13) t
CC
400 ns
SCLK to CS Hold (Note 13) t
CCH
100 ns
CS Inactive Time (Note 13) t
CWH
2.7V ≤ V
CC
≤ 5.5V 400
ns
1.71V ≤ V
CC
≤ 1.89V 500
CS to Output High Impedance t
CDZ
(Notes 13, 14) 40 ns
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Maxim Integrated │ 3
DS1390–DS1394 Low-Voltage SPI/3-Wire RTCs
with Trickle Charger
DC Electrical Characteristics
AC Electrical Characteristics—SPI Interface
Recommended DC Operating Conditions (continued)