DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
6
Maxim Integrated
AC ELECTRICAL CHARACTERISTICS—3-WIRE INTERFACE
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C.) (Note 1) (Figures 3, 4)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
2.7V V
CC
5.5V 0 4
SCLK Frequency (Note 13) f
SCLK
1.71V V
CC
1.89V 0 1
MHz
Data to SCLK Setup t
DC
(Notes 13, 14) 30 ns
SCLK to Data Hold t
CDH
(Notes 13, 14) 30 ns
2.7V V
CC
5.5V 80
SCLK to Data Valid (Notes 13,
14, 15)
t
CDD
1.71V V
CC
1.89V 160
ns
2.7V V
CC
5.5V 110
SCLK Low Time (Note 13) t
CL
1.71V V
CC
1.89V 400
ns
2.7V V
CC
5.5V 110
SCLK High Time (Note 13) t
CH
1.71V V
CC
1.89V 400
ns
SCLK Rise and Fall t
R
, t
F
200 ns
CS to SCLK Setup t
CC
(Note 13) 400 ns
SCLK to CS Hold t
CCH
(Note 13) 100 ns
2.7V V
CC
5.5V 400
CS Inactive Time (Note 13) t
CWH
1.71V V
CC
1.89V 500
ns
CS to Output High Impedance t
CDZ
(Note 13, 14) 40 ns
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Pushbutton Debounce PB
DB
160 200 ms
Reset Active Time t
RST
160 200 ms
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 16) 100 ms
