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DS1558B Datasheet(PDF) 3 Page - Maxim Integrated Products |
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DS1558B Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 18 page DS1558 3 of 18 PIN DESCRIPTION (continued) PIN NAME FUNCTION 35 VBAT1 37 VBAT2 Battery Inputs for Any Standard +3V Lithium Cell or Other Energy Source. Battery voltage must be held between 2.5V and 3.7V for proper operation. UL recognized to ensure against reverse charging current when used with a lithium battery. If only one battery is used, it should be attached to VBAT1, and VBAT2 should be grounded. See “Conditions of Acceptability” at http://www.maxim-ic.com/TechSupport/QA/ntrl.htm. 38 RST Active-Low Power-On Reset Output (Open Drain). This pin is an output used to signal that VCC is out of tolerance. On power-up, RST is held low for a period of time to allow the system to stabilize. The RTC and SRAM are not accessible while RST is active. This pin is open drain and requires an external pullup resistor. 40 VCCO VCC Output to RAM. While VCC is above VBAT, the external SRAM is powered by VCC. When VCC is below the battery level, the SRAM is powered by one of the VBAT inputs. 42 VCC Power-Supply Input. DC power is provided to the device on these pins. VCC is the +5V input. When 5V (or 3.3V for the 3.3V version) is applied within normal limits, the device is fully accessible and data can be written and read. Reads and writes are inhibited when a 3V battery is connected to the device and VCC is VTP. However, the timekeeping function continues unaffected by the lower input voltage. As VCC falls below VBAT, the RAM and RTC are switched over to the external power supply (nominal 3.0V DC) at VBAT. 46 X1 47 X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 6pF. For more information about crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks. The DS1558 can also be driven by an external 32.768kHz oscillator. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated. TYPICAL OPERATING CIRCUIT |
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Similar Description - DS1558B |
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