AB08X5 Real-Time Clock Family
Date of Issue: October 16, 2014
3.0 x 3.0 mm
Page 10 of 33
Abracon Drawing #453567
Revision: C
For Table 5, TA = -40 °C to 85 °C, TYP values at 25 °C.
Table 5: Power Supply and Switchover Parameters
SYMBO
L
TEST
CONDITIONS
PARAMETER
PWR TYPE
POWER STATE
MIN
TYP
MAX UNIT
Clocks operating
and RAM and
registers retained
VCC
System Power Voltage
VCC Static
VCC Power
1.5
3.6
3.6
V
I2C or SPI opera-
tion
VCC I/O Interface
Voltage
VCCIO
VCC Static
VCC Rising
VCC Power
1.5
1.6
V
V
V
VCC Start-up Voltage(1)
VCC Reset Voltage
VCCST
VCCRST
POR -> VCC Power
VBAT < VBAT,MIN or
no VBAT
VCC Falling VCC Power -> POR
1.3
1.5
1.7
VCC Rising Switch-over
Threshold Voltage
VBAT Power ->
VCC Rising
VCCSWR
VCCSWF
VCCSWH
V
V
BAT ≥ VBATRST
1.6
1.5
70
V
V
VCC Power
VCC Falling Switch-over
Threshold Voltage
VCC Power ->
VCC Falling
BAT ≥ VBATSW,MIN
1.2
VBAT Power
VCC Switchover Thresh-
old Hysteresis(2)
VCC Power <->
VCC Hyst.
mV
VBAT Power
VCC Falling Slew Rate
to switch to VBAT state(4)
VCC Power ->
VCC Falling
VCCFS
V
CC < VCCSW,MAX
0.7
1.4
1.6
1.4
V/ms
V
VBAT Power
Clocks operating
and RAM and reg-
isters retained
VBAT
Battery Voltage
VBAT Static
VBAT Power
3.6
Battery Switchover Volt-
age Range(5)
VCC Power ->
VBAT Power
VBATSW
VBAT Static
VBAT Falling
3.6
1.4
V
V
Falling Battery POR Volt-
age(7)
VBAT Power ->
POR
VBATRST
VCC < VCCSWF
1.1
1.5
VBAT Margin
above
VBMRG
VBAT Power
VBAT Power
VBAT Static
VBAT Static
200
1.0
mV
(3)
VCC
VBAT supply series resis-
tance(6)
VBATESR
k
(1)
V
must be above VCCST to exit the POR state, independent of the VBAT voltage.
CC
(2) Difference between VCCSWR and VCCSWF
.
(3)
V
must be higher than VCC by at least this voltage to ensure the AB08X5 remains in the VBAT Power state.
BAT
(4) Maximum VCC falling slew rate to guarantee correct switchover to VBAT Power state. There is no VCC falling slew rate
requirement if switching to the VBAT power source is not required.
(5)
V
voltage to guarantee correct transition to VBAT Power state when VCC falls.
BAT
(6) Total series resistance of the power source attached to the VBAT pin. The optimal value is 1.5k, which may require an
external resistor. VBAT power source ESR + external resistor value = 1.5k
(7)
V
is also the static voltage required on VBAT for register data retention.
BATRST
ABRACON [ ABRACON ]
