Features: • Timekeeping supply voltage ranging from 1.45 to 5.5 volts • Low supply current: TYP. 0.35µA (MAX. 0.8µA) at 3 volts (at 25˚C)• Only three signal lines (SCLK, SIO, and CE) required for connection to the CPU. Maximum clock frequency of 2 MHz (with VDD ...
RV5C339A: Features: • Timekeeping supply voltage ranging from 1.45 to 5.5 volts • Low supply current: TYP. 0.35µA (MAX. 0.8µA) at 3 volts (at 25˚C)• Only three signal lines ...
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Symbol | Item | Conditions | Ratings | Unit |
VDD | Supply Voltage | 0.3 to +6.5 | V | |
VI | Input Voltage 1 | SIO | 0.3 to VDD+0.3 | V |
Input Voltage 2 | SCLK, CE | 0.3 to +6.5 | ||
VO | Output Voltage 1 | SIO | 0.3 to VDD+0.3 | V |
Output Voltage 2 | 32KOUT, INTRA , INTRB | 0.3 to +6.5 | ||
PD | Power Dissipation | Topt=25˚C | 300 | mW |
Topt | Operating Temperature | 40 to +85 | ˚C | |
Tstg | Storage Temperature | 55 to +125 | ˚C |
Pin No. | Symbol | Name | Description |
7 | CE | Chip Enable Input | The CE pin is used for interfacing with the CPU. Should be held high to allow access to the CPU. Incorporates a pull-down resistor. Should be held low or open when the CPU is powered off. Allows a maximum input voltage of 5.5 volts regard- less of supply voltage. |
2 | SCLK | Serial Clock Input | The SCLK pin is used to input clock pulses synchronizing the input and output of data to and from the SIO pin. Allows a maximum input voltage of 5.5 volts regard- less of supply voltage. |
3 | SIO | Serial Input/Output | The SIO pin is used to input and output data intended for writing and reading in synchronization with the SCLK pin. CMOS input/output. |
6 | IATRA | Interrupt Output A | The IATRA pin is used to output periodic interrupt signals to the CPU and alarm interrupt signals (Alarm_D). Disabled at power-on from 0 volts. Nch. open drain output. |
4 | IATRB | Interrupt Output B | The IATRB pin is used to output alarm interrupt signals (Alarm_W). Disable at power-on from 0 volts. Nch. open drain output. |
1 | 32KOUT | 32-kHz Clock Output | The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled at power-on from 0 volts. Nch. open drain output. The RV5C339A is designed to be disabled 32-kHz clock output in response to a command from the host computer. |
9 8 |
OSCIN OSCOUT |
Oscillation Circuit Input/Output |
The OSCIN and OSCOUT pins are used to connect the 32.768-kHz crystal oscilla- tor (with all other oscillation circuit components built into the RV5C339A.) |
10 5 |
VDD VSS |
Positive Power Supply Input Negative Power Supply Input |
The VDD pin is connected to the power supply. The VSS pin is grounded. |