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Status
Part Number	Status	Explanation
DS2423	This product is No Longer Available.	The DS2423 is no longer available. 1-Wire devices DS2433 and DS28EC20 provide comparable NV memory but not the counter functions.

Data Sheet

FULL DATA SHEET (PDF, 588kB) Download   E-Mail

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. The battery-backed memory offers a simple solution to storing and retrieving information pertaining to the equipment where the DS2423 is installed and its frequency of use. The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it may be read back for verification. A copy scratchpad command will then transfer the data to memory. This process ensures data integrity when modifying the memory. A 64-bit registration number is factory lasered into each DS2423 to provide a guaranteed unique identity which allows for absolute traceability and acts as node address if multiple DS2423 are connected in parallel to form a local network. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. The DS2423 1-Wire RAM with Counters can store encrypted data. The unique registration number and the page write cycle counter(s) prevent unauthorized manipulation of data stored in a page with a write cycle counter associated.

Key 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 with strict 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

Application Notes

Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS2423 Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2423 Application Note 3845: The MAXQ Microcontroller in Action: Designing a Bicycle Computer with the MAXQ2000 - DS2423

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS2423.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

DS2423	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2423X		N/A	No Longer Available	FCHIP;6 pin;5.7 mm² Outline Drawing: 21-0290 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: BF623-2*	-40°C to +85°C	See data sheet
DS2423P+T&R		N/A	No Longer Available	TSOC;6 pin;17.8 mm² Outline Drawing: 21-0382 (PDF) Land Pattern: 90-0321 (PDF) Use pkgcode/variation: D6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS2423P-500-00/T&R		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS2423P/T&R		N/A	No Longer Available	TSOC;6 pin;17.8 mm² Outline Drawing: 21-0382 (PDF) Land Pattern: 90-0321 (PDF) Use pkgcode/variation: D6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS2423P		N/A	No Longer Available	TSOC;6 pin;17.8 mm² Outline Drawing: 21-0382 (PDF) Land Pattern: 90-0321 (PDF) Use pkgcode/variation: D6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS2423P+		N/A	No Longer Available	TSOC;6 pin;17.8 mm² Outline Drawing: 21-0382 (PDF) Land Pattern: 90-0321 (PDF) Use pkgcode/variation: D6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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