Rainbow Electronics DS2404 - Manual

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FEATURES
§ 4096 bits of nonvolatile dual-port memory
including real time clock/calendar in binary
format, programmable interval timer, and
programmable power-on cycle counter
§ 1-Wire ® interface for MicroLAN
communication at 16.3kbits/s
§ 3-wire host interface for high-speed data
communications at 2Mb/s
§ 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 pages of 256-bits
for packetizing data
§ 256-bit scratchpad with strict read/write
protocols ensures integrity of data transfer
§ Programmable alarms can be set to generate
interrupts for interval timer, real time clock,
and/or cycle counter
§ 16-pin DIP, SO, and SSOP packages
§ Operating temperature range from -40°C to
+85°C
§ Operating voltage range from 2.8V to 5.5V
ORDERING INFORMATION
DS2404-001 16-pin DIP
DS2404S-001 16-pin SO
DS2404B 16-pin SSOP
DS2404S-001/T&R Tape and Reel of S2404S-001
DS2404B/T&R
Tape and Reel of DS2404B
PIN ASSIGNMENT
PIN DESCRIPTION
V
CC
– 2.8 to 5.5V
IRQ – Interrupt Output
RST – 3-Wire Reset Input
DQ – 3-Wire Input/Output
I/O – 1-Wire Input/Output
CLK – 3-Wire Clock Input
NC – No Connection
GND – Ground
V
BATB
– Battery Backup Input
V
BATO
– Battery Operate Input
1Hz – 1Hz Output
X
1
, X2 – Crystal Connections
DESCRIPTION
The DS2404 EconoRAM Time Chip offers a simple solution for storing and retrieving vital data and time
information with minimal hardware. The DS2404 contains a unique lasered ROM, real-time
clock/calendar, interval timer, cycle counter, programmable interrupts, and 4096-bits of SRAM. Two
separate ports are provided for communication: 1-Wire and 3-wire. Using the 1-Wire port, only one pin is
required for communication, and the lasered-ROM can be read even when the DS2404 is without power.
The 3-wire port provides high-speed communication using the traditional Dallas Semiconductor 3-wire
interface. With either interface, a strict protocol for accessing the DS2404 ensures data integrity. Utilizing
backup energy sources, the data is nonvolatile (NV) and allows for stand-alone operation.
VCC 1 16 VCC
IRQ 2 15 X1
RST 3 14 X2
DQ 4 13 GND
I/O 5 12 NC
CLK 6 11 1HZ
NC 7 10 VBATO
GND 8 9 VBATB
16-PIN DIP (300 MIL)
16-PIN SO (300 MIL)
16-PIN SSOP (208 MIL)
See Mechanical Drawings Section
DS2404
EconoRAM Time Chip
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