DS2423 Datasheet, PDF (1/25 Pages) Dallas Semiconductor – 4kbit 1-Wire RAM with Counter

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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
DS2423
4kbit 1-Wire
RAM with Counter
§ 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
TSOC PACKAGE
16
25
34
TOP VIEW
3.7mm x 4.0mm x 1.5mm
SIDE VIEW
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
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.
1-Wire is a registered trademark of Dallas Semiconductor.
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