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060603

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

PIN ASSIGNMENT

PIN DESCRIPTION

Pin 1

Ground

Pin 2

Data

Pin 3

Vbat

Pin 4

NC

Pin 5

Input channel B

Pin 6

Input channel A

ORDERING INFORMATION

DS2423P

6-pin TSOC package

DS2423P/T&R

Tape & Reel Version of

DS2423P

DS2423X

Chip Scale Pkg., Tape &

Reel

DESCRIPTION

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.

DS2423

4kbit 1-Wire

RAM with Counter

www.maxim-ic.com

1

2

3

6

5

4

TOP VIEW

3.7mm x 4.0mm x 1.5mm

SIDE VIEW

TSOC PACKAGE

1-Wire is a registered trademark of Dallas Semiconductor.