DS1305EN+T&R

DS1305EN+T&R is a serial alarm real-time clock from Analog Devices that connects to the host through an SPI or 3-wire interface and adds 96 bytes of non-volatile RAM alongside the clock and calendar. It operates from 2.0 to 5.5V in a 20-pin TSSOP package, and its temperature grade covers -40 to +85 degrees C, suiting industrial controllers, loggers and embedded systems that must keep time and a small block of protected data through power cycles. The on-chip NV RAM gives designers a convenient place for calibration values, counters and configuration without adding a separate memory chip, which reduces component count and board area. Analog Devices lists the DS1305 family as in production, and the ordering table in the datasheet confirms this exact tape-and-reel code for the -40 to +85 degrees C, 20-TSSOP version. Selection and sourcing advice: order DS1305EN+T&R in full, including the plus sign and the suffix, because the visually similar DS1305EN code without the + is a different packing variant supplied in tubes; pick the +T&R code for reel-fed SMT lines, verify that your host supports the SPI or 3-wire timing given in the datasheet, and plan the backup supply arrangement so the clock and NV RAM stay alive when the main rail is off. Parameters verified against Analog Devices documentation.