DS1673:Portable System Controller

The DS1673 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a real-time clock (RTC), NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication with the DS1673 is established through a simple 3-wire interface. The RTC provides seconds, minutes, hours, day, date, month, and year information with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the DS1673 is powered by the system power supply or when in battery-backup operation, so the alarm can be used to wake up a system that is powered down. Automatic backup and write protection of an external SRAM is provided through the VCCO, active-low CEOL, and active-low CEOH pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. The chip-enable outputs to RAM (active-low CEOL and active-low CEOH) are controlled during power transients to prevent data corruption.

Key Features
  • Provides 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
    • Power-Control Circuitry Supports System
    • Power-On from Day/Time Alarm
  • Microprocessor Monitor
    • Halts Microprocessor During Power Fail
    • Automatically Restarts Microprocessor after
    • Power Failure
    • Monitors Pushbutton for External Override
    • Halts and Resets an Out-of-Control
    • Microprocessor
  • NV RAM Control
    • Automatic Battery Backup and Write Protection
    • to External SRAM
  • 3-Channel, 8-Bit ADC
  • Simple 3-Wire Interface
  • +3.0V or +5.0V Operation
DS1673: Block Diagram
DS1673: Block Diagram
DataSheet
titleDownload file
DS1673 Data SheetDS1673.pdf
Parametrics
Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS16733-Wire3
5
3006None1NV SRAM Control
RTC
SOIC(W)/20
TSSOP/20
$4.08 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1673E-3No Longer AvailableDS1673E-3+TSSOP,;20 pin;45.2 mm²0°C to +70°CNo
DS1673E-3+ActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1673E-3+T&RActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1673E-3/T&RNo Longer AvailableDS1673E-3+T&RTSSOP,;20 pin;45.2 mm²0°C to +70°CNo
DS1673E-5No Longer AvailableDS1673E-5+TSSOP,;20 pin;45.2 mm²0°C to +70°CNo
DS1673E-5+ActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1673E-5+T&RActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1673E-5/T&RNo Longer AvailableDS1673E-5+T&RTSSOP,;20 pin;45.2 mm²0°C to +70°CNo
DS1673S-3No Longer AvailableDS1673S-3+SOIC(W),;20 pin;138.5 mm²0°C to +70°CNo
DS1673S-3+ActiveSOIC(W),;20 pin;138.5 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1673S-5No Longer AvailableDS1673S-5+SOIC(W),;20 pin;138.5 mm²0°C to +70°CNo
DS1673S-5+ActiveSOIC(W),;20 pin;138.5 mm²0°C to +70°CLead Free
DS1673S-5+T&RActiveSOIC(W),;20 pin;138.5 mm²0°C to +70°CLead Free
DS1673.pdf DS1673
DS1673.pdf DS1673
DS1673.pdf DS1673
Tips for Writing Bulletproof Real-Time Clock Control Code DS3234
State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks DS3234
Oscillator Design Considerations for Low-Current Applications DS17885
Selecting a Backup Source for Real-Time Clocks DS3234
Using the DS32kHz with Maxim Real-Time Clocks DS17885
Lithium Coin-Cell Batteries: Predicting an Application Lifetime DS9034PCX
Design Considerations for Maxim Real-Time Clocks DS3234
DS1670 Portable System Controller DS1677
Crystal Considerations with Maxim Real-Time Clocks (RTCs) DS3234
DS1673.pdf DS1673
DS1673.pdf DS1673