
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
6
Maxim Integrated
AC ELECTRICAL CHARACTERISTICS—3-WIRE INTERFACE
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C.) (Note 1) (Figures 3, 4)
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
2.7V
VCC
5.5V
0
4
SCLK Frequency (Note 13)
fSCLK
1.71V
VCC
1.89V
0
1
MHz
Data to SCLK Setup
tDC
(Notes 13, 14)
30
ns
SCLK to Data Hold
tCDH
(Notes 13, 14)
30
ns
2.7V
VCC
5.5V
80
SCLK to Data Valid (Notes 13,
14, 15)
tCDD
1.71V
VCC
1.89V
160
ns
2.7V
VCC
5.5V
110
SCLK Low Time (Note 13)
tCL
1.71V
VCC
1.89V
400
ns
2.7V
VCC
5.5V
110
SCLK High Time (Note 13)
tCH
1.71V
VCC
1.89V
400
ns
SCLK Rise and Fall
tR, tF
200
ns
CS to SCLK Setup
tCC
(Note 13)
400
ns
SCLK to
CS Hold
tCCH
(Note 13)
100
ns
2.7V
VCC
5.5V
400
CS Inactive Time (Note 13)
tCWH
1.71V
VCC
1.89V
500
ns
CS to Output High Impedance
tCDZ
(Note 13, 14)
40
ns
AC ELECTRICAL CHARACTERISTICS
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Pushbutton Debounce
PBDB
160
200
ms
Reset Active Time
tRST
160
200
ms
Oscillator Stop Flag (OSF) Delay
tOSF
(Note 16)
100
ms