DS1302 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – Trickle Charge Timekeeping Chip

TIGER ELECTRONIC CO.,LTD
Trickle Charge Timekeeping Chip
DS1302
FEATURES
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
31 x 8 RAM for scratchpad data storage
Serial I/O for minimum pin count
2.0–5.5V full operation
Uses less than 300 nA at 2.0V
Single–byte or multiple–byte (burst mode)
data transfer for read or write of clock or
RAM data
8–pin DIP or optional 8–pin SOICs for
surface mount
Simple 3–wire interface
TTL–compatible (V_CC = 5V)
Optional industrial temperature range
–40°C to +85°C
DS1202 compatible
Recognized by Underwriters Laboratory
ORDERING INFORMATION
PART #
DS1302
DESCRIPTION
8–Pin DIP
DS1302N
8-Pin DIP (Industrial)
DS1302S
8–Pin SOIC (200 mil)
DS1302SN
8–Pin SOIC (Industrial)
DS1302Z
8–Pin SOIC (150 mil)
DS1302ZN
8–Pin SOIC (Industrial)
DS1302S-16
16-Pin SOIC (300 mil)
DS1302SN-16
16-Pin SOIC (Industrial)
PIN ASSIGNMENT
VCC2
1
X1 2
X2 3
GND 4
8 VCC1
7 SCLK
6 I/O
5 RST
DS1302
8-Pin DIP (300 mil)
VCC2
1
X1 2
8
VCC1
7 SCLK
X2 3
6 I/O
GND 4
5 RST
DS1302S 8-Pin SOIC (200 mil)
DS1302Z 8-Pin SOIC (150 mil)
VCC2
NC
X1
NC
X2
NC
NC
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
16-Pin SOIC
VCC1
NC
SCLK
NC
I/O
NC
NC
RST
PIN DESCRIPTION
X1, X2
– 32.768 kHz Crystal Pins
GND
– Ground
RST
I/O
SCLK
V_CC1, V_CC2
– Reset
– Data Input/Output
– Serial Clock
– Power Supply Pins
DESCRIPTION
The DS1302 Trickle Charge Timekeeping Chip contains a real time clock/calendar and 31 bytes of static
RAM. It communicates with a microprocessor via a simple serial interface. 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–hour or 12–hour format with an AM/PM indicator
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