PT7C4311 Datasheet, PDF (4/16 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4311
Real-time Clock Module (I²C Bus)
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DC Electrical Characteristics
(Unless otherwise specified, V_CC = 1.5 ~ 5.5 V, T_A = -40 °C to +85 °C.)
Sym.
Description
Pin
Condition
Min Typ Max Unit
V_CC
V_BAT1
V_SO2
Timing data and RAM data
maintaining voltage
Timing data writing voltage
Timing data reading voltage
RAM data writing voltage
RAM data reading voltage
Supply voltage
Battery Back-up Switchover
Voltage^3,4
VCC -
VCC -
VCC -
VCC -
VCC
VBAT -
-
-
1.2
-
5.5
1.5
-
5.5
V
1.5
-
5.5
3.0
-
5.5
1.5
-
5.5
2.0
3
3.5⁶
V
V_BAT - V_BAT - V_BAT -
0.80 0.50 0.30⁵
V
I_CC Current consumption
I_ST Standby current
I_BAT Current consumption
V_IL Low-level input voltage
V_IH High-level input voltage
Low-level output voltage
V_OL Pull-up Supply voltage
(Open drain)
VCC
VCC
VBAT
-
Switch freq. = 400kHz
SDA, SCL = V_CC – 0.3V
OSC on, V_CC = 0V, V_BAT = 3V,
T_A=25°C
-
-
-
SDA
FT/
OUT
I_OL = 3mA
-
-
70
150 A
-
25
80 A
-
300 800 nA
-0.3
-
0.3V_CC
0.7V_CC
-
V_CC
V
+0.5
-
-
0.4
V
-
-
5.5
I_IL Input leakage current
SCL
0<V_IN<V_CC
-
-
1 A
I_OZ Output current when OFF
SDA
0<V_OUT<V_CC
-
-
1 A
Note:
1. After switchover (V_SO), V_BAT (min) can be 2.0V for crystal with R_S=40k.
2. Switch-over and deselect point.
3. Valid for Ambient Operating Temperature: T_A = -40 to 85°C; V_CC = 2.0 to 5.5V (except where noted). VCC fall time should
not exceed 5 mV/μs.
4. All voltages referenced to GND.
5. In 3.3V application, if initial battery voltage is ≥ 3.4V, it may be necessary to reduce battery voltage (i.e., through wave
soldering the battery) in order to avoid inadvertent switchover/reselection for VCC – 10% operation.
6. For rechargeable backup, V_BAT (max) may be considered to be V_CC.
2015-06-0002
PT0322-8
06/16/15
4