MK41T56 Datasheet | STMicroelectronics

DESCRIPTION The MK41T56 TIMEKEEPER® is a low power 512 bit static CMOS RAM organized as 64 words by 8 bits. A built-in 32.768 k Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two-line bi-directional bus. The built-in address register is incremented automatically after each write or read data byte. The MK41T56 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium button cell. Table 1. Signal Names OSCI OCSO FT/OUT SDA SCL VBAT VCC VSS March 1999 Oscillator Input Oscillator Output Frequency Test / Output Driver (Open Drain) Serial Data Address Input / Output Serial Clock Battery Supply Voltage Supply Voltage Ground 1/15 8 1 PSDIP8 (N) 0.4mm Frame 8 1 SO8 (S) 150mil Width Figure 1. Logic Diagram VBAT OSCI SCL MK41T56 MKI41T56 OSCO SDA FT/OUT AI02304 MK41T56, MKI41T56 Figure 2A. DIP Pin Connections Figure 2B. SOIC Pin Connections MK41T56 MKI41T56 OSCI OSCO VBAT VSS 1 2 3 4 8 7 6 5 AI02305 MK41T56 MKI41T56 VCC FT/OUT SCL SDA OSCI OSCO VBAT VSS 1 2 3 4 8 7 6 5 AI02306 VCC FT/OUT SCL SDA Table 2. Absolute Maximum Ratings Symbol TA TSTG VIO VCC IO PD Parameter Ambient Operating Temperature MK41T56 MKI41T56 Value 0 to 70 - 40 to 85 - 55 to 125 - 0.3 to 7 - 0.3 to 7 20 0.25 Unit °C °C V V m A W Storage Temperature (VCC Off, Oscillator Off) Input or Output Voltages Supply Voltage Output Current Power Dissipation Note: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not...