STMicroelectronics M48T18-100PC1, Real Time Clock (RTC), 8192B RAM Parallel, 28-Pin PCDIP
34mm, Maximum Operating Supply Voltage: 5.STMicroelectronics M48T18-100PC1, Real Time Clock (RTC), 8192B RAM Parallel, 28-Pin PCDIP, Functions: Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection, Date Format: DW:DM:M:Y, Time Format: HH:MM:SS, Mounting Type: Through Hole, Dimensions: 39.