4K (512 x 8) 2-Wire ™ RTC is a EEPROM with Real Time Clock/Calendar/CPU Supervisor functions produced by Xicor
The X1228 is a 4‑Kbit (512 × 8) EEPROM real‑time clock/ calendar device with integrated CPU supervisor functions, dual polled alarms, watchdog timer and a programmable frequency/interrupt output. It operates over a 2.7 V to 5.5 V supply range and includes a backup VBACK pin for battery or super‑capacitor power.
Typical applications include utility meters, HVAC equipment, audio/video components, set‑top boxes, network routers, POS equipment and other industrial, medical or automotive systems. The device is offered in 14‑lead SOIC and TSSOP packages and is fully compatible with standard I²C‑compatible 2‑wire interfaces.
| Supply Voltage (VCC) Range | 2.7 V – 5.5 V |
|---|---|
| Backup Voltage (VBACK) Range | 1.8 V – 5.5 V |
| EEPROM Size | 4 Kbit (512 × 8) |
| Number of Pins | 14 pins |
| Typical Active Supply Current (I_CC1) at 2.7 V | 400 µA |
| Watchdog Timer Options | 0.25 s, 0.75 s, 1.75 s, or off |
The device is rated for temperatures from –65 °C to +135 °C.
It provides two polled (non‑volatile) alarms.
The VBACK pin provides a backup supply voltage for battery or super‑capacitor operation.
The device is offered in 14‑lead SOIC and 14‑lead TSSOP packages.