●DESCRIPTION
●The DS2423 1-Wire® RAM with Counters is a fully static, read/write memory for battery operation in a low-cost, six-lead TSOC, surface-mount package. The memory is organized as 16 pages of 256 bits each. In addition, the device has four counters, two of them with external trigger inputs called A and B. Each of the counters is associated with a memory page. A counter without external trigger input increments each time data is written to the page it is associated with (write cycle counter). The counters triggered by inputs A and B, respectively, increment with every low-going pulse on their input. All counters are read only. They are automatically cleared to 0 when the battery is connected.
●FEATURES
●4096 bits of SRAM
●Four 32-bit, read-only counters
●Active-low external trigger inputs for two of the counters with on-chip debouncing compatible with reed and Wiegand switches
●Unique, factory-lasered and tested 64-bit
●registration number (8-bit family code + 48- bit serial number + 8-bit CRC tester) assures
●absolute traceability because no two parts are alike
●Memory partitioned into 16 256-bit pages in for packetizing data
●256-bit scratchpad withstrict read/write protocols ensures integrity of data transfer
●On-chip 16-bit CRC generator for safeguarding data transfers
●Built-in multidrop controller ensures compatibility with other MicroLAN products
●Directly connects to a single port pin of a microprocessor and communicates at up to
●16.3kbits per second
●Overdrive mode boosts communication speed to 142kbits per second
●8-bit family code specifies device
●communication requirements to reader
●Presence detector acknowledges when reader first applies voltage
●Compact, low cost 6-pin TSOC surface mount package
●Reads, writes and counts over a wide voltage range of 2.8V to 5.5V from -40°C to +85°C
