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PT7C4302WEX

P1-P3P4-P6P7-P9P10-P12P13-P14
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Real-time Clock Module (3-wire Interface)
2015-11-0004 PT0225-6 11/25/15
1
PT7C4302
Features
Using external 32.768kHz quartz crystal
Real-time clock (RTC) counts seconds, minutes
hours, date of the month, month, day of the week,
and year with leap-year compensation valid up to
2099
31-byte, nonvolatile (NV) RAM for data storage
Time keeping voltage: 1.5V to 5.5V
Uses less than 300nA at 2.0V
Simple 3-wire interface
Serial I/O for minimum pin count
Burst mode for reading/writing successive addresses
in clock/RAM
TTL-compatible (VCC = 5V)
Optional industrial temperature range: -40°C to
+85°C
Battery backup
Trickle charger on chip for rechargeable energy
source backup
Description
The PT7C4302 serial real-time clock is a low-
power clock/calendar with a programmable square-wave
output and 31 bytes of nonvolatile RAM.
Address and data are transferred serially via a 3-
wire 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.
Table 1 shows the basic functions of PT7C4302.
More details are shown in section: overview of functions.
Pin Assignment
X1
X2
GND
VCC1
SCLK
I/O
6
7
8
1
2
3
VCC2
4
5
RST
PT7C4302
DIP-8
SOIC-8
Pin Description
Pin no.
Pin
Type
Description
1
VCC
2
P
Primary power. When V
CC2
is greater than V
CC1
+ 0.2V, V
CC2
will power the IC. While V
CC2
<V
CC1
, V
CC1
will power the IC.
*1
2
X1
I
Oscillator Circuit Input. Together with X2, 32.768kHz crystal is connected between them.
3
X2
O
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.
4
GND
P
Ground.
5
RST
I
Reset. The reset signal must be asserted high during a read or a write. This pin has a 40kΩ internal pull-
down resistor.
6
I/O
I/
O
Serial Data Input/Output. I/O is the input/output pin for the 3-wire serial interface. The pin has a 40k
internal pull-down resistor.
7
SCL
K
I
Serial Clock Input. SCLK is used to synchronize data movement on the 3-wire serial interface. The pin
has a 40k internal pull-down resistor.
8
VCC
1
P
Backup power. When V
CC2
is greater than V
CC1
+ 0.2V, V
CC2
will power the IC. While V
CC2
<V
CC1
, V
CC1
will power the IC.
*1
Note
*1
: If V
CC1
connects to battery, the battery voltage V
CC1
has to be lower than V
CC2
- 0.2Vwhen IC is read and written.
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2015-11-0004 PT0225-6 11/25/15
2
PT7C4302
Real-time Clock Module (3-wire Interface)
Function Block
Shift Registers
Address
Decoder
Address
Register
I /O
Interface
(3-wires)
SCLK
I/O
PT7C4302
OSC
X1
X2
C
D
C
G
Time Counter
(Sec,Min,Hour,Day,Date,Month,Year)
31 x 8
RAM
Power Manager
VCC1
VCC2
RST
32.768
kHz
Counter
Chain
Note: C
D
=C
G
=11pF
Maximum Ratings
Storage Temperature…………………………………...-65℃ to +150℃
Ambient Temperature with Power Applied......................-40℃ to +85℃
Supply Voltage to Ground Potential (Vcc to GND) ……………..-0.3V to +6.5V
DC Input (All Other Inputs except Vcc & GND)………………..-0.3V to +6.5V
DC Output Voltage (SDA, /INTA, /INTB pins)………………...-0.3V to +6.5V
Power Dissipation ........................................320mW (Depend on package)
Recommended Operating Conditions
Description
Min
Type
Max
Unit
Backup power voltage
1.5
-
5.5
V
Timing data and RAM data maintaining voltage
1.2
-
5.5
Timing data writing voltage
1.5
-
5.5
Timing data reading voltage
1.5
-
5.5
RAM data writing voltage
3.0
-
5.5
RAM data reading voltage
1.5
-
5.5
Input high level
2
-
V
CC
+0.3
Input low level
-0.3
-
0.3
Operating temperature
-40
-
85
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
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.
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2015-11-0004 PT0225-6 11/25/15
3
PT7C4302
Real-time Clock Module (3-wire Interface)
DC Electrical Characteristics
Unless otherwise specified, GND =0V, T
A
= 25 °C, Oscillation frequency = 32.768 kHz.
Sym
Item
Pin
Conditions
Min
Typ
Max
Unit
V
CC1
Backup power voltage
VCC1
-
1.5
-
5.5
V
V
CC2
Timing and RAM data maintaining
VCC2
-
1.2
-
5.5
V
Timing data writing voltage
-
1.5
-
5.5
Timing data reading voltage
-
1.5
-
5.5
RAM data writing voltage
-
3.0
-
5.5
RAM data reading voltage
-
1.5
-
5.5
I
CC1
Current consumption
VCC1
OSC on, Note 2, 5
V
CC1
: 2V
-
-
0.4
mA
V
CC1
: 5V
-
-
1.2
OSC on, Note 1, 5
V
CC1
: 2V
-
0.5
-
A
V
CC1
: 5V
-
1
-
OSC off, Note 4,
5, 7
V
CC1
: 2V
-
100
-
nA
V
CC1
: 5V
-
100
-
I
CC2
Current consumption
VCC2
OSC on, Note 2, 6
V
CC1
: 2V
-
-
0.425
mA
V
CC1
: 5V
-
-
1.28
OSC on, Note 1, 6
V
CC1
: 2V
-
-
25.3
A
V
CC1
: 5V
-
-
81
OSC off, Note 4, 6
V
CC1
: 2V
-
-
25
A
V
CC1
: 5V
-
-
80
V
IL1
Low-level input voltage
SCL, /RST
V
CC1
: 5V
-
1.1
0.8
V
V
CC1
: 2V
-
0.6
0.4
V
IH1
High-level input voltage
SCL, /RST
V
CC1
: 5V
2.0
1.3
-
V
V
CC1
: 2V
1.4
0.9
-
V
IL2
Low-level input voltage
X1
V
CC1
: 5V
-
1.9
0.8
V
V
CC1
: 2V
-
0.9
0.6
V
IH2
High-level input voltage
X1
V
CC1
: 5V
2.0
1.9
-
V
V
CC1
: 2V
1.4
0.9
-
V
OL
Low-level output voltage
I/O
I
OH
= 1.5mA, V
CC
= 2V
-
0.08
0.4
V
I
OH
= 4.0mA, V
CC
= 5V
-
0.11
0.4
V
OH
High-level output voltage
I/O
I
OH
= -0.4mA, V
CC
= 2V
1.6
1.9
-
V
I
OH
= -1.0mA, V
CC
= 5V
2.4
4.9
-
I
IL
Input leakage current
/RST,SCLK
Note 3
-
-
500
A
I
OZ
Output current when OFF
I/O
Note 3
-
-
500
A
V
TD
Trickle Charge Diode Voltage Drop
-
-
-
0.7
-
V
R1
Trickle charge resistors
-
-
-
2
-
k
R2
-
-
-
4
-
R3
-
-
-
8
-
Note:1. I/O open, /RST set to a logic 0, and /EOSC bit = 0 (oscillator enabled).
2. I/O pin open, /RST high, SCLK=2MHz at V
CC
= 5V; SCLK = 500kHz, V
CC
= 2.0V, and /EOSC bit = 0 (oscillator
enabled).
3. /RST, SCLK, and I/O all have 40k pull-down resistors to ground.
4. /RST, I/O, and SCLK open. The /EOSC bit = 1 (oscillator disabled).
5. V
CC2
= 0V.
6. V
CC1
= 0V.
7. Typical values are at 25C.
P1-P3P4-P6P7-P9P10-P12P13-P14

PT7C4302WEX

Mfr. #:
Buy PT7C4302WEX
Manufacturer:
Diodes Incorporated
Description:
Real Time Clock Real-time Clock Mod 3-wire Interface
Lifecycle:
New from this manufacturer.
Delivery:
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