DS1302Z
Analog Devices Inc./Maxim IntegratedUnited States

DS1302Z

ObsoleteReal Time Clocks8 SO

IC RTC CLK/CALENDAR SER 8SOIC

DS1302Z is a real-time clock chip with 2.0V to 5.5V supply voltage, 8-pin SO (150 mils) package, 31x8 battery-backed RAM, and trickle-charge capability, featuring a 3-wire serial interface.Checked against the datasheet

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Technical parameters

Datasheet-verified parameters

29 items
ParameterValue and test conditionsSource
Package8 SO (150 mils)
Operating Temperature Range0°C to +70°C
RoHSCompliant (Lead-free)
Recommended Supply VoltageMin: 2.0 V, Typ: 3.3 V, Max: 5.5 V
Absolute Maximum Voltage-0.5V to +7.0V
Absolute Maximum Storage Temperature-55°C to +125°C
CLK FrequencyMax: 0.5 MHz (VCC=2.0V), Max: 2.0 MHz (VCC=5V)
Logic 1 Input VoltageMin: 2.0 V, Max: VCC + 0.3 V
Logic 0 Input VoltageMin: -0.3 V, Max: +0.3 V (VCC=2.0V); Min: -0.3 V, Max: +0.8 V (VCC=5V)
Logic 1 Output VoltageMin: 1.6 V (VCC=2.0V, IOH=-0.4mA); Min: 2.4 V (VCC=5V, IOH=-1.0mA)
Logic 0 Output VoltageMax: 0.4 V (VCC=2.0V, IOL=1.5mA); Max: 0.4 V (VCC=5V, IOL=4.0mA)
Input Leakage CurrentTyp: 85 μA, Max: 500 μA
I/O Leakage CurrentTyp: 85 μA, Max: 500 μA
Active Supply Current (VCC1)Max: 0.4 mA (VCC1=2.0V); Max: 1.2 mA (VCC1=5V)
Timekeeping Current (VCC1)Typ: 0.2 μA, Max: 0.3 μA (VCC1=2.0V); Typ: 0.45 μA, Max: 1 μA (VCC1=5V)
Standby Current (VCC1)Typ: 1 nA, Max: 100 nA (VCC1=2.0V); Typ: 1 nA, Max: 100 nA (VCC1=5V)
Active Supply Current (VCC2)Max: 0.425 mA (VCC2=2.0V); Max: 1.28 mA (VCC2=5V)
Timekeeping Current (VCC2)Max: 25.3 μA (VCC2=2.0V); Max: 81 μA (VCC2=5V)
Standby Current (VCC2)Max: 25 μA (VCC2=2.0V); Max: 80 μA (VCC2=5V)
Trickle-Charge Resistor R1Typ: 2 kΩ
Trickle-Charge Resistor R2Typ: 4 kΩ
Trickle-Charge Resistor R3Typ: 8 kΩ
Trickle-Charge Diode Voltage DropTyp: 0.7 V
Data to CLK Setup TimeMin: 200 ns (VCC=2.0V); Min: 50 ns (VCC=5V)
CLK to Data Hold TimeMin: 280 ns (VCC=2.0V); Min: 70 ns (VCC=5V)
CLK to Data Delay TimeMax: 800 ns (VCC=2.0V); Max: 200 ns (VCC=5V)
Thermal Resistance (Junction to Ambient)170 °C/W
Thermal Resistance (Junction to Case)40 °C/W
CertificationUL Recognized
All parameters (19)ExpandCollapse
Power
Current - Timekeeping (Max)0.3µA ~ 1µA @ 2V ~ 5V
Voltage - Supply2V ~ 5.5V
Voltage - Supply, Battery2V ~ 5.5V
Environment and package
Memory Size31B
Mounting TypeSurface Mount
Operating Temperature0°C ~ 70°C
PackageTube
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SOIC
Other
Base Product NumberDS1302
Date FormatYY-MM-DD-dd
DigiKey ProgrammableNot Verified
FeaturesLeap Year, NVSRAM, Trickle-Charger
Interface3-Wire Serial
MfrAnalog Devices Inc./Maxim Integrated
Product StatusObsolete
Series-
Time FormatHH:MM:SS (12/24 hr)
TypeClock/Calendar

Pinout and package

PIN CONFIGURATIONS
PIN CONFIGURATIONS
Package: 8 SO (150 mils)
PinNameFunctionSource
1VCC2(Power 2)
2X1(Crystal 1)
3X2(Crystal 2)
4GND(Ground)
5CE(Chip Enable)
6I/O(Data Input/Output)
7SCLK(Serial Clock)
8VCC1(Power 1)

Documents

DatasheetDatasheet · 204.8 KB · 2026-10-29
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