X1226

Features:

• Real Time Clock/Calendar
   -Tracks time in Hours, Minutes, and Seconds
   -Day of the Week, Day, Month, and Year
• 2 Polled Alarms (Non-volatile)
   -Settable on the Second, Minute, Hour, Day of
      the Week, Day, or Month
   -Repeat Mode (periodic interrupts)
• Oscillator Compensation on chip
   -Internal feedback resistor and compensation
      capacitors
   -64 position Digitally Controlled Trim Capacitor
   -6 digital frequency adjustment settings to
      ±30ppm
• Battery Switch or Super Cap Input
• 512 x 8 Bits of EEPROM
   -64-Byte Page Write Mode
   -8 modes of Block Lock™ Protection
   -Single Byte Write Capability
• High Reliability
   -Data Retention: 100 years
   -Endurance: 100,000 cycles per byte
• 2-Wire™ Interface interoperable with I2C*
   -400kHz data transfer rate
• Frequency Output (SW Selectable: Off, 1Hz,
   4096Hz or 32.768kHz)
• Low Power CMOS
   -1.25A Operating Current (Typical)
• Small Package Options
   -8-Lead SOIC and 8-Lead TSSOP


Application

• Utility Meters
• HVAC Equipment
• Audio / Video Components
• Set Top Box / Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers / PDA
• POS Equipment
• Test Meters / Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial / Medical / Automotive

Pinout




Specifications

Temperature Under Bias ......................-65°C to +135°C
Storage Temperature...........................-65°C to +150°C
Voltage on V_CC, V_BACK and PHZ/IRQ
pin (respect to ground) ................................-0.5V to 7.0V
Voltage on SCL, SDA, X1 and X2
pin (respect to ground) ....................-0.5V to 7.0V or 0.5V
above V_CC or V_BACK (whichever is higher)
DC Output Current ....................................................5 mA
Lead Temperature (Soldering, 10 sec) ...................300°C


Description

The X1226 device is a Real Time Clock with clock/ calendar, two polled alarms with integrated 512x8 EEPROM, oscillator compensation, and battery backup switch.
The X1226 uses an external, low-cost 32.768kHz crystal. All compensation and trim components are integrated on the chip. This eliminates several external discrete components and a trim capacitor, saving board area and component cost.