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DS1202SN-8 Datasheet

  • DS1202SN-8

  • Serial Timekeeping Chip

  • 11頁(yè)

  • DALLAS   DALLAS

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DS1202, DS1202S
DS1202, DS1202S
Serial Timekeeping Chip
FEATURES
PIN ASSIGNMENT
NC
X1
X2
GND
1
2
3
4
8
7
6
5
V
CC
SCLK
I/O
RST
鈥?/div>
Real time clock counts seconds, minutes, hours, date
of the month, month, day of the week, and year with
leap year compensation valid up to 2100
鈥?/div>
24 x 8 RAM for scratchpad data storage
鈥?/div>
Serial I/O for minimum pin count
鈥?/div>
2.0鈥?.5 volt full operation
鈥?/div>
Uses less than 300 nA at 2 volts
鈥?/div>
Single鈥揵yte or multiple鈥揵yte (burst mode) data trans-
fer for read or write of clock or RAM data
8鈥揚(yáng)IN DIP
NC
X1
X2
GND
1
2
3
4
8
7
6
5
V
CC
SCLK
I/O
RST
8鈥揚(yáng)IN SOIC
(208 mil)
NC
NC
X1
NC
X2
NC
NC
1
2
3
4
5
6
7
8
16鈥揚(yáng)IN SOIC
16
15
14
13
12
11
10
9
V
CC
NC
SCLK
NC
I/O
NC
NC
RST
鈥?/div>
8鈥損in DIP or optional 16鈥損in SOIC for surface mount
鈥?/div>
Simple 3鈥搘ire interface
鈥?/div>
TTL鈥揷ompatible (V
CC
= 5V)
鈥?/div>
Optional industrial temperature range 鈥?0擄C to +85擄C
(IND)
ORDERING INFORMATION
DS1202
DS1202S
DS1202S鈥?
DS1202N
DS1202SN
DS1202SN鈥?
8鈥損in DIP
16鈥損in SOIC
8鈥損in SOIC
8鈥損in DIP (IND)
16鈥損in SOIC (IND)
8鈥損in SOIC (IND)
GND
PIN DESCRIPTION
NC
X1, X2
GND
RST
I/O
SCLK
V
CC
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
No Connection
32.768 KHz Crystal Input
Ground
Reset
Data Input/Output
Serial Clock
Power Supply Pin
DESCRIPTION
The DS1202 Serial Timekeeping Chip contains a real
time clock/calendar and 24 bytes of static RAM. It com-
municates with a microprocessor via a simple serial in-
terface. The real time clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The end of the month date is automatically adjusted for
months with less than 31 days, including corrections for
leap year. The clock operates in either the 24鈥揾our or
12鈥揾our format with an AM/PM indicator. Interfacing the
DS1202 with a microprocessor is simplified by using
synchronous serial communication. Only three wires
are required to communicate with the clock/RAM: (1)
RST (Reset), (2) I/O (Data line), and (3) SCLK (Serial
clock). Data can be transferred to and from the clock/
RAM one byte at a time or in a burst of up to 24 bytes.
The DS1202 is designed to operate on very low power
and retain data and clock information on less than 1 mi-
crowatt.
ECopyright
1997 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
032697 1/11

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