BQ32000 Datasheet, PDF (4/20 Pages) Texas Instruments – REAL-TIME CLOCK (RTC)

bq32000
SLUS900B – DECEMBER 2008 – REVISED JUNE 2009................................................................................................................................................... www.ti.com
ABSOLUTE MAXIMUM RATINGS⁽¹⁾
over operating free-air temperature range (unless otherwise noted)
V_IN Input voltage
T_J
Operating junction temperature
T_STG Storage temperature range after reflow
V_CC to GND
All other pins to GND
LIMIT
–0.3 to 4
–0.3 to V_CC + 0.3
–40 to 150
–60 to 150
UNIT
V
V
°C
°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
V_CC Supply voltage, V_CC to GND
T_A
Operating free-air temperature
f_o
Crystal resonant frequency
R_S
Crystal series resistance
C_L
Crystal load capacitance
MIN TYP
3
–40
32.768
12
MAX
3.6
85
40
UNIT
V
°C
kHz
kΩ
pF
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER
Power Supply
I_CC
V_CC supply current
V_BACK Backup supply voltage
I_BACK Backup supply current
Logic Level Inputs
V_IL
Input low voltage
V_IH Input high voltage
I_IN
Input current
Logic Level Outputs
V_OL Output low voltage
I_L
Leakage current
Real-Time Clock Characteristics
Pre-calibration accuracy
TEST CONDITION
Operating
Switchover
V_CC = 0 V, V_BAT = 3V, Oscillator on, T_A = 25°C
0 V ≤ V_IN ≤ V_CC
I_OL = 3 mA
V_CC = 3.3 V, V_BAT = 3 V, Oscillator on, T_A = 25°C
MIN TYP
MAX UNIT
100
1.4
2.0
1.2
µA
V_CC
V
V_CC
1.5 µA
0.7 V_CC
-1
0.3 V_CC V
V
1 µA
-1
±35 ⁽¹⁾
0.4 V
1 µA
ppm
(1) Typical accuracy is measured using reference board design and KDS DMX-26S surface-mount 32.768-kHz crystal. Variation in board
design and crystal section results in different typical accuracy.
4
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