DS1222

Microprocessor Circuit, CMOS, PDIP14, 0.300 INCH, DIP-14
7,651 Effective Inventory

DS1222

Effective Inventory7,651

Microprocessor Circuit, CMOS, PDIP14, 0.300 INCH, DIP-14

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Service & Packaging

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DS1222 DataSheet
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DS1222 Description

The DS1222 is a low-power, non-volatile SRAM chip with a battery backup that maintains data during power loss.

Pin Details

The DS1222 is a 14-DIP (0.300", 7.62mm) integrated smart card interface device with multiple features including a 2-wire multiprotocol asynchronous serial interface, programmable baud rate generator, programmable interface guard time, secure tamper-proof clock/calendar with alarm and battery backup, integrated power-on-reset, and hardware watchdog timer.

Features

  • The DS1222 is an integrated smart card interface device with multiple features including a 2-wire multiprotocol asynchronous serial interface, programmable baud rate generator, programmable interface guard time, secure tamper-proof clock/calendar with alarm and battery backup, integrated power-on-reset, and hardware watchdog timer.
  • It offers low-power consumption, making it ideal for portable devices, embedded systems, industrial equipment, and automotive applications.

Applications

The DS1222 is commonly used in backup power supplies, real-time clocks, memory storage systems, and other applications that require nonvolatile storage of critical data.

Where to Use:

  • Portable devices
  • Embedded systems
  • Industrial equipment
  • Automotive applications

Manufacturer

The DS1222 is manufactured by Analog Devices Inc./Maxim Integrated, a global leader in semiconductor technology.

Packages

The DS1222 comes in an 14-DIP (0.300", 7.62mm) package, making it suitable for compact circuit designs.

Equivalent Parts of DS1222

  • DS1221: A comparable SRAM chip with similar features and performance.

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Rohs Code No Part Life Cycle Code Obsolete
Part Package Code DIP Pin Count ! 14
Reach Compliance Code not_compliant HTS Code ! 8542.31.00.01
JESD-30 Code R-PDIP-T14 JESD-609 Code e0
Length 19.05 mm Moisture Sensitivity Level 1
Number of Terminals 14 Operating Temperature-Max 70 °C
Package Body Material PLASTIC/EPOXY Package Code DIP
Package Equivalence Code DIP14,.3 Package Shape RECTANGULAR
Package Style IN-LINE Qualification Status ! Not Qualified
Seated Height-Max 4.572 mm Supply Voltage-Max 5.5 V
Supply Voltage-Min 4.5 V Supply Voltage-Nom 5 V
Surface Mount ! NO Technology CMOS
Temperature Grade ! COMMERCIAL Terminal Finish TIN LEAD
Terminal Form ! THROUGH-HOLE Terminal Pitch ! 2.54 mm
Terminal Position DUAL Width 7.62 mm
uPs/uCs/Peripheral ICs Type MICROPROCESSOR CIRCUIT

Datasheet PDF

Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.

Preliminary Specification DS1222 PDF Download

FAQs

What is DS1222?

The DS1222 is a low-power real-time clock (RTC) module designed by Maxim Integrated. It is ideal for applications requiring accurate timekeeping, such as industrial automation, consumer electronics, and embedded systems.

How Does DS1222 Work?

The DS1222 works by providing accurate time and date information using an integrated crystal oscillator and an internal counter. It communicates with the host system through a simple serial interface and can be configured to provide alarms and periodic interrupts for time-based operations.

How Many Pins does DS1222 have and What are the Functions of the Pinout Configuration?

The DS1222 is available in various package options, such as 8-pin DIP (Dual Inline Package) or SOIC (Small Outline Integrated Circuit). The pinout configuration includes:

  • VCC: Power supply pin.
  • GND: Ground pin.
  • SO/SCL: Serial data input/output or serial clock input, depending on the interface mode.
  • SI/SDA: Serial data input or serial data I/O, depending on the interface mode.
  • IRQ: Interrupt output pin for alarm or periodic interrupts.
  • EOSC: External oscillator input or digital input for controls.
  • BAT: Battery input for backup power.
  • X1, X2: Connections for external crystal or resonator.

What are the Pros and Cons of DS1222?

Pros:

  • Low Power Consumption: Operates with minimal power, suitable for battery-powered devices.
  • Accurate Timekeeping: Provides accurate time and date information for system synchronization.
  • Simple Interface: Communicates with the host system through a straightforward serial interface.
  • Alarm and Interrupt Functions: Offers flexible alarm and periodic interrupt capabilities for time-based operations.
  • Versatile Package Options: Available in different package options to suit various design requirements.

Cons:

  • Accuracy vs. Precision: May have limitations in long-term accuracy without periodic calibration.
  • Battery Dependency: Requires a backup battery for maintaining timekeeping during power loss.
  • Interface Complexity: Different interface modes may require careful configuration for proper operation.

Are There Any Equivalents/Alternatives to DS1222 for Recommendation?

  • Similar real-time clock modules include the DS1338 from Maxim Integrated and the PCF8563 from NXP Semiconductors.
  • Alternatives to the DS1222 include the MCP7940N from Microchip Technology and the RV-8803-C7 from Micro Crystal AG.

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