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DS1222
Microprocessor Circuit, CMOS, PDIP14, 0.300 INCH, DIP-14
DS1222
Microprocessor Circuit, CMOS, PDIP14, 0.300 INCH, DIP-14
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Service & Packaging
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DS1222 DataSheet
Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
The DS1222 BankSwitch Chip is a CMOS circuit designed to select one of 16 memory banks under software control. Memory bank switching allows for an increase in memory capacity without additional address lines. Continuous blocks of memory are enabled by selecting proper memory bank through a pattern recognition sequence on four address inputs. Custom patterns from Dallas Semiconductor can provide security through uniqueness and prevent unauthorized access. By combining the DS1222 with the DS1212 Nonvolatile Controller x16 Chip, up to 16 banks of static RAMs can be selected.FEATURES■ Provides bank switching for 16 banks of memory■ Bank switching is software-controlled by a pattern recognition sequence on four address inputs■ Automatically sets all 16 banks off on power-up■ Bank switching logic allows only one bank on at a time■ Custom recognition patterns are available to prevent unauthorized access■ Full ±10% operating range■ Low-power CMOS circuitry■ Can be used to expand the address range of■ microprocessors and decoders■ Optional 16-pin SOIC surface mount package
Key Features
- Provides bank switching for 16 banks of
- memory
- Bank switching is software-controlled by a
- pattern recognition sequence on four address
- inputs
- Automatically sets all 16 banks off on
- power-up
- Bank switching logic allows only one bank on
- at a time
- Custom recognition patterns are available to
- prevent unauthorized access
- Full ±10% operating range
- Low-power CMOS circuitry
- Can be used to expand the address range of
- microprocessors and decoders
- Optional 16-pin SOIC surface mount package
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 |
| Operating Temperature-Min | 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.
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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