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What is DS1302?

This electronic component, produced by the manufacturer "Dallas", performs the same function as "Trickle Charge Timekeeping Chip".


DS1302 Datasheet PDF - Dallas

Part Number DS1302
Description Trickle Charge Timekeeping Chip
Manufacturers Dallas 
Logo Dallas Logo 


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DS1302
Trickle-Charge Timekeeping Chip
www.maxim-ic.com
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
2.0V to 5.5V Full Operation
Uses Less than 300nA 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 SO for Surface
Mount
Simple 3-Wire Interface
TTL-Compatible (VCC = 5V)
Optional Industrial Temperature Range:
-40°C to +85°C
DS1202 Compatible
Underwriters Laboratory (UL) Recognized
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS1302
DS1302+
0°C to +70°C
0°C to +70°C
8 PDIP (300 mils)
8 PDIP (300 mils)
DS1302N
-40°C to +85°C 8 PDIP (300 mils)
DS1302N+
DS1302S
-40°C to +85°C 8 PDIP (300 mils)
0°C to +70°C 8 SO (208 mils)
DS1302S+
0°C to +70°C 8 SO (208 mils)
DS1302SN
DS1302SN+
-40°C to +85°C 8 SO (208 mils)
-40°C to +85°C 8 SO (208 mils)
DS1302Z
0°C to +70°C 8 SO (150 mils)
DS1302Z+
DS1302ZN
0°C to +70°C 8 SO (150 mils)
-40°C to +85°C 8 SO (150 mils)
DS1302ZN+
-40°C to +85°C 8 SO (150 mils)
DS1302S-16
0°C to +70°C 16 SO (300 mils)
DS1302SN-16 -40°C to +85°C 16 SO (300 mils)
TOP MARK*
DS1302
DS1302
DS1302
DS1302
DS1302S
DS1302S
DS1302S
DS1302S
DS1302Z
DS1302Z
DS1302ZN
DS1302ZN
DS1302S16
DS1302SN16
+ Denotes a lead-free/RoHS-compliant device.
*An N anywhere on the top mark indicates an industrial temperature grade
device. A + anywhere on the top mark indicates a lead-free device.
PIN CONFIGURATIONS
TOP VIEW
VCC2
X1
X2
GND
1
2
3
4
8 VCC1
7 SCLK
6 I/O
5 CE
DIP (300mils)
VCC2
X1
X2
GND
1
2
3
4
8 VCC1
7 SCLK
6 I/O
5 CE
SO (208 mils/150 mils)
VCC2
N.C.
X1
N.C.
X2
N.C.
N.C.
GND
1
2
3
4
5
6
7
8
16 VCC1
15 N.C.
14 SCLK
13 N.C.
12 I/O
11 N.C.
10 N.C.
9 CE
SO (300 mils)
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 110805

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DS1302 equivalent
DS1302 Trickle-Charge Timekeeping Chip
OSCILLATOR CIRCUIT
The DS1302 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or
capacitors to operate. Table 1 specifies several crystal parameters for the external crystal. Figure 2 shows a
functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is
usually less than one second.
CLOCK ACCURACY
The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between
the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional
error will be added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the
oscillator circuit may result in the clock running fast. Figure 3 shows a typical PC board layout for isolating the
crystal and oscillator from noise. Refer to Application Note 58: Crystal Considerations for Dallas Real-Time Clocks
for detailed information.
Table 1. Crystal Specifications*
PARAMETER
SYMBOL MIN
Nominal Frequency
fO
Series Resistance
ESR
Load Capacitance
CL
TYP
32.768
6
MAX
45
UNITS
kHz
k
pF
*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks for additional specifications.
Figure 2. Oscillator Circuit Showing Internal Bias Network
RTC
COUNTDOWN
CHAIN
CL1 CL2 RTC
REGISTERS
X1 X2
CRYSTAL
Figure 3. Typical PC Board Layout for Crystal
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
NOTE: AVOID ROUTING SIGNALS IN THE
CROSSHATCHED AREA (UPPER LEFT-
HAND QUADRANT) OF THE PACKAGE
UNLESS THERE IS A GROUND PLANE
BETWEEN THE SIGNAL LINE AND THE
PACKAGE.
GND
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DS1302-Timekeeping-Chip


1. Datasheet - Trickle-Charge Timekeeping Chip

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