PT7C4339 Datasheet, PDF (2/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4339/4339C
Real-time Clock Module
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Pin Description
Pin No Pin Type
4339 4339C Name
1/
X1
I
2/
X2
O
6 7 SCL
I
5 4 SDA I/O
3
2
V_BACKU
O
P
7
6
SQW
/INT
O
85
V_CC
P
4 3 GND P
/ 1,8 NC
Description
Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or
external clock input.
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.
When 32.768kHz external input, X2 must be float.
Serial Clock Input. SCL is used to synchronize data movement on the I²C serial interface. The
pull up voltage may be up to 5.5V regardless of the voltage on V_CC.
Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA
pin is open-drain output and requires an external pull-up resistor. The pull up voltage may be up to
5.5V regardless of the voltage on V_CC.
Secondary Power Supply. Supply voltage must be held between 1.3V and 3.7V for proper
operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally,
this pin can be connected to a rechargeable cell or a super cap when used in conjunction with the
trickle-charge feature. Diodes should not be placed in series between the backup source and the
V_BACKUP input, or improper operation will result. If a backup supply is not required, V_BACKUP must
be grounded.
Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. It is an
open-drain output and requires an external pull up resistor. The pull up voltage may be up to 5.5V
regardless of the voltage on V_CC. If not used, this pin may be left unconnected.
Power. When voltage is applied within normal limits, the device is fully accessible and data can be
written and read. When a backup supply is connected and V_CC is below V_PF, reads and writes are
inhibited. The timekeeping and alarm functions operate when the device is powered by V_CC or
V_BACKUP.
Ground.
No Connect. These pins are not connected internally, but must be grounded for proper operation.
Maximum Ratings
Storage Temperature .................................................................................... -55oC to +125oC
Ambient Temperaturewith Power Applied..............................................-40oC to +85oC
SupplyVoltage to Ground Potential(V_CCto GND)..................................-0.3Vto +6.0V
DC Input (All Other Imputs except V_CC & GND) ........................... -0.3V to V_CC +0.3V
DC Output Voltage (SDA, SQW /INT pins).............................................-0.3Vto +6.0V
Power Dissipation...................................................................320mW(depend onpackage)
Lead Temperature(soldering, 10s)............................................................................+260 ^oC
SolderingTemperature (reflow).................................................................................+260 ^oC
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operating Conditions
Symbol
Description
V_CC
V_BACKUP
V_IH
V_IL
V_PF
T_A
Supply Voltage
Backup Supply Voltage
Input high level
Input low level
Power-Fail Voltage
Operation Temperature
Min
3.0
1.3
0.7V_CC
-0.3
1.60
-40
Type
3.3
3.0
-
-
1.72
-
Max
Unit
5.5
V
3.7
V
V_CC+0.3
V
0.3V_CC
V
1.88
V
85
ºC
2015-08-0008
PT0508-1 08/24/15
2