IDT1338B-31
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
RTC
Handling, PCB Layout, and Assembly
The IDT1338B-31 package contains a quartz tuning-fork crystal. Pick-and-place equipment may be used, but precautions
should be taken to ensure that excessive shocks are avioded. Ultarsonic cleaning equipment should be avioded to prevent
damage to the crystal.
Avoid running signal traces under the package, unless a ground plane is placed between the package and the signal line.
All NC (no connect) pins must be connected to ground.
Moisture-sensitive packages are shipped from the factory dry-packed. Handling instructions listed on the package label must
be followed to prevent damage during reflow. Refer to the IPC/JEDEC J-STD-020 standard for moisture-sensitive device
(MSD) classifications.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the IDT1338B-31. These ratings, which
are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at
these or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Voltage Range on Any Pin Relative to Ground
Storage Temperature
Rating
-0.3 V to +6.0 V
-55 to +125° C
260°C
Soldering Temperature
Recommended DC Operating Conditions
(V = V
to V
, TA = -40°C to +85°C, unless otherwise noted. Typical values are at V = 3.3 V,
CC
CC(MIN)
CC(MAX) CC
TA = +25°C, unless otherwise noted.) (Note 1)
Parameter
Symbol
Min.
-40
Typ.
Max.
+85
Units
Ambient Operating Temperature
T
° C
A
V
Input Voltage, Note 2
V
1.3
3.0
3.7
BAT
BAT
Pull-up Resistor Voltage (SQW/OUT), Note 2
Logic 1, Note 2
V
5.5
V
V
V
PU
V
0.7VCC
-0.3
VCC + 0.3
+0.3VCC
IH
Logic 0, Note 2
V
IL
Supply Voltage
IDT1338-18
V
V
1.8
3.3
5.5
5.5
PF
V
V
V
CC
IDT1338-31
PF
Power Fail Voltage
IDT1338-18
1.40
2.45
1.62
2.7
1.71
2.97
V
PF
IDT1338-31
IDT™ REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 11
IDT1338B-31 REV A 112309
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
