User Manual

DS3234
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
4 _____________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
2.7V ≤ V
CC
≤ 5.5V 4
SCLK Clock Frequency f
SCL
2.0V ≤ V
CC
< 2.7V 2
MHz
Data to SCLK Setup t
DC
30 ns
SCLK to Data Hold t
CDH
30 ns
SCLK to CS Setup t
CCS
30 ns
2.7V ≤ V
CC
≤ 5.5V 80
SCLK to Data Valid (Note 7) t
CDD
2.0V ≤ V
CC
< 2.7V 160
ns
2.7V ≤ V
CC
≤ 5.5V 110
SCLK Low Time t
CL
2.0V ≤ V
CC
< 2.7V 220
ns
2.7V ≤ V
CC
≤ 5.5V 110
SCLK High Time t
CH
2.0V ≤ V
CC
< 2.7V 220
ns
SCLK Rise and Fall t
R
, t
F
200 ns
CS to SCLK Setup t
CC
400 ns
2.7V ≤ V
CC
≤ 5.5V 100
SCLK to CS Hold t
CCH
2.0V ≤ V
CC
< 2.7V 200
ns
CS Inactive Time t
CWH
400 ns
CS to Output High Impedance t
CDZ
(Note 8) 40 ns
Pushbutton Debounce PBDB 250 ms
Reset Active Time t
RST
250 ms
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 9) 100 ms
Temperature Conversion Time t
CONV
125 200 ms
POWER-SWITCH CHARACTERISTICS
(T
A
= -40°C to +85°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Fall Time; V
PF(MAX)
to
V
PF(MIN)
t
VCCF
300 µs
V
CC
Rise Time; V
PF(MIN)
to
V
PF(MAX)
t
VCCR
0µs
Recovery at Power-Up t
REC
(Note 10) 125 300 ms
CAPACITANCE
(T
A
= +25°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Capacitance on All Input Pins C
IN
(Note 11) 10 pF
Capacitance on All Output Pins C
IO
Outputs high impedance (Note 11) 10 pF