Milpitas, Calif. Three real-time clocks from Xicor Inc. integrate calendar and memory functions and operate from as little as 1.8 volts in various embedded applications.
The X1226 packs 4 kbits of E2PROM and provides basic clock/calendar functions. The X1227 and X1228, also with 4 kbits of E2PROM, provide that plus CPU supervisory functions including programmable low-voltage detection circuits, power-on-reset circuits and a watchdog timer. The X1226 and X1228 also have a user-selectable frequency output option that can generate square waves of 32.768 kHz, 4,096 Hz or 1 Hz from the real-time clock.
All three clocks let designers preset time- or calendar-driven alarms with resolutions ranging from a second to one year, or for a specific day of the week. All support a two-wire interface and feature on-chip oscillator compensation, eliminating the need for an external RC circuit and improving clock accuracy.
In lots of 100, the X1226S8 is $2, the X1227S8 is $3 and the X1228S14 is $3.13.
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EETInfo No. 607