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PT7C433833 PDF даташит

Спецификация PT7C433833 изготовлена ​​​​«Pericom Semiconductor» и имеет функцию, называемую «Real-time Clock Module».

Детали детали

Номер произв PT7C433833
Описание Real-time Clock Module
Производители Pericom Semiconductor
логотип Pericom Semiconductor логотип 

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PT7C433833 Даташит, Описание, Даташиты
PT7C433833
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Real-time Clock Module (I2C Bus)
Product Features
Using external 32.768kHz quartz crystal
Supports I2C-Bus's high speed mode (400 kHz)
Includes time (Hour/Minute/Second) and calendar
(Year/Month/Date/Day) counter functions (BCD
code)
Programmable square wave output signal
56-byte, battery-backed, nonvolatile (NV) RAM for
data storage
Automatic power-fail detect and switch circuitry of
battery backup
UL Recognized: E348121
Product Description
The PT7C4338 serial real-time clock is a low-power
clock/calendar with a programmable square-wave output
and 56 bytes of nonvolatile RAM.
Address and data are transferred serially via a 2-wire,
bidirectional bus. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in either the
24-hour or 12-hour format with AM/PM indicator.
The PT7C4338 series have a built-in power sense circuit
that detects power failures and automatically switches to
the battery supply.
Table 1 shows the basic functions of PT7C4338. More
details are shown in section: overview of functions.
Table 1. Basic functions of PT7C4338
Item
Function
Source: Crystal: 32.768kHz
1 Oscillator Oscillator enable/disable
Oscillator fail detect
2 Time
Time display
12-hour
24-hour
Century bit
3 Alarm interrupt
4 Programmable square wave output (Hz)
5 RAM
6 Battery backup
12-07-0001
1
PT7C4338
-
-
1, 4.096k, 8.192k, 32.768k
568
PT0321-6 07/04/12









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PT7C433833 Даташит, Описание, Даташиты
PT7C433833
Real-time Clock Module (I2C Bus)
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Pin Assignment
Pin Description
PT7C4338
1 X1
VCC 8
2 X2
SQW/OUT 7
3 VBAT
SCL 6
4 GND
SDA 5
SOIC-8
MSOP-8
Pin no.
1
2
6
Pin Type
Description
32.768kHz Crystal Connections. The internal oscillator circuitry is designed for operation with
X1 I a crystal having a specified load capacitance (CL) of 12.5pF. Pin X1 is the input to the oscillator
and can optionally be connected to an external 32.768kHz oscillator. The output of the internal
oscillator, pin X2, is floated if an external oscillator is connected to pin X1. An external
X2 O 32.768kHz oscillator can also drive the PT7C4338. In this configuration, the X1 pin is connected
to the external oscillator signal and the X2 pin is floated.
SCL I Serial Clock Input. SCL is used to synchronize data movement on the I2C serial interface.
5
SDA
I/O
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.
Square-Wave/Output Driver. When enabled and the SQWE bit set to 1, the SQW/OUT pin
7 SQW/OUT O outputs one of four square-wave frequencies (1Hz, 4kHz, 8kHz, 32kHz). It is open drain and
requires an external pull up resistor. Operates with either VCC or VBAT applied.
Supply Voltage. When voltage is applied within normal limits, the device is fully accessible and
8
VCC
P
data can be written and read. When a backup supply is connected to the device and VCC is
below VPF, reads and writes are inhibited. However, the timekeeping function continues
unaffected by the lower input voltage.
+3V Battery Input. Backup supply input for any standard 3V lithium cell or other energy
3
VBAT
P
source. Battery voltage must be held between the minimum and maximum limits for proper
operation. If a backup supply is not required, VBAT must be grounded. UL recognized to ensure
against reverse charging when used with a lithium battery.
Ground. DC power is provided to the device on these pins. VCC is the primary power input.
When voltage is applied within normal limits, the device is fully accessible and data can be
4
GND
P written and read. When a backup supply is connected to the device and VCC is below VPF, reads
and writes are inhibited. However, the timekeeping function continues unaffected by the lower
input voltage.
12-07-0001
PT0321-6 07/04/12
2









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PT7C433833 Даташит, Описание, Даташиты
PT7C433833
Real-time Clock Module (I2C Bus)
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Function Block
Maximum Ratings
StorageTemperature...............................................................................................................-55oCto +125oC
Ambient Temperaturewith Power Applied......................................................................-40oCto +85oC
SupplyVoltage to Ground Potential(Vcc to GND) ..................................................... -0.3Vto +6.5V
DC Input (All Other Inputs except Vcc & GND)........................................................... -0.3Vto +6.5V
DC Output Voltage (SDA, /INTA, /INTB pins)..............................................................-0.3Vto +6.5V
DC Output Current(FOUT)..................................................................................................-0.3Vto (Vcc+0.3V)
Power Dissipation....................................................................................................................320mW (depend on package)
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 conditions above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Recommended Operating Conditions
(VCC = VCC(MIN) to VCC(MAX), TA = -40to +85.) (Note 1)
Parameter
Symbol
Conditions
Min.
Supply Voltage
VCC PT7C433833
2.7
Logic 1
VIH Note 2
0.7 * VCC
Logic 0
VIL Note 2
-0.3
Power-Fail Voltage
VPF
PT7C433833
-
VBAT Battery Voltage
VBAT
Note 2
1.5
Note 1: Limits at -40°C are guaranteed by design and not production tested.
Note 2: All voltages are referenced to ground.
Typ.
3.3
-
-
2.59
3.0
Max.
5.5
VCC + 0.3
+0.3 * VCC
-
3.7
Unit
V
12-07-0001
PT0321-6 07/04/12
3










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Номер в каталогеОписаниеПроизводители
PT7C433833Real-time Clock ModulePericom Semiconductor
Pericom Semiconductor

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