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DS1558B Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # DS1558B
Description  Watchdog Clock with NV RAM Control
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1558B Datasheet(HTML) 3 Page - Maxim Integrated Products

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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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