DS2224 Maxim Integrated Products, Inc., DS2224 Datasheet

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DS2224

Manufacturer Part Number
DS2224
Description
Ds2223, Ds2224 Econoram
Manufacturer
Maxim Integrated Products, Inc.
Datasheet

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Part Number
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Part Number:
DS2224
Manufacturer:
DALLAS
Quantity:
5 510
FEATURES
DESCRIPTION
The DS2223 and DS2224 EconoRAMs are fully static,
micro–powered, read/write memories in low–cost
TO–92 or SOT–223 packages. The DS2223 is orga-
nized as a serial 256 x 1 bit static read/write memory.
The DS2224’s first 32 bits are lasered with a unique ID
code at the time of manufacture; the remaining 224 bits
are static read/write memory. Signaling necessary for
reading or writing is reduced to just one interface lead.
Both the DS2223 and DS2224 are not recommended
for new designs. However, the parts will remain avail-
able until the year 2003, at least.
Low–cost, general–purpose, 256–bit memory
Reduces control, address and data interface to a
single pin
Each DS2224 32–bit ROM is factory–lasered with a
unique serial number
DS2224 portion of ROM with custom code and unique
serial number available
Minimal operating power: 45 nanocoulombs per
transaction @1.5V typical
Less than 15 nA standby current at 25 C
Nonvolatile data retention easily achieved via low–
cost alkaline batteries or capacitors
Directly connects to a port pin of popular microcontrol-
lers
Operation from 1.2 to 5.5 volts
Popular TO–92 or SOT–223 surface mount package
Operates over industrial temperature range –40 C to
+85 C
– DS2223 has 256–bit SRAM
– DS2224 has 32–bit ROM, 224–bit SRAM
PACKAGE OUTLINE
PIN CONNECTIONS
Pin 1
Pin 2
Pin 3
Pin 4
ORDERING INFORMATION
DS2223
DS2223Z
DS2223T
DS2223Y
DS2224
DS2224Z
DS2224T
DS2224Y
See Mech. Drawings
BOTTOM VIEW
1
1
Section
TO–92
GND
DQ
V
GND
2
2 3
CC
3
256–bit SRAM – TO–92 Package
256–bit SRAM – SOT–223 Package
1000 piece tape–and–reel of DS2223
2500 piece tape–and–reel of DS2223Z
32–bit serial number (ROM), 224–bit
SRAM – TO–92 Package
32–bit serial number (ROM), 224–bit
SRAM – SOT–223 Package
1000 piece tape–and–reel of DS2224
2500 piece tape–and–reel of DS2224Z
– Ground
– Data In/Out
– Supply
– Ground
DS2223/DS2224
See Mech. Drawings
EconoRAM
2
TOP VIEW
SOT–223
Section
4
1
DS2223/DS2224
3
080598 1/10

Related parts for DS2224

DS2224 Summary of contents

Page 1

... TO–92 or SOT–223 packages. The DS2223 is orga- nized as a serial 256 x 1 bit static read/write memory. The DS2224’s first 32 bits are lasered with a unique ID code at the time of manufacture; the remaining 224 bits are static read/write memory. Signaling necessary for reading or writing is reduced to just one interface lead ...

Page 2

... All data is read and written least significant bit first. Although the DS2224 has the first 32 bits replaced by lasered ROM rather than SRAM, it requires 256 write time slots for a complete write transaction. The data ...

Page 3

... RDV 60 s < t SLOT RESISTOR 1 s < t LOWR 0 < t MASTER RELEASE 1 s < t REC DS2223/DS2224 RDV t t SLOT REC DS2223/DS2224 60 s < SLOT < LOW1 < REC t REC t SLOT t LOW0 < t < SLOT < t SLOT REC t RELEASE < < < < DS2223/DS2224 080598 3/10 ...

Page 4

... W/R W/R W/R W/R ALL 1s – WRITE ANY 0 – READ READ/WRITE TRANSACTION Figure 5 LSB DS2223 COMMAND WORD DS2224 COMMAND WORD READ/WRITE FLOW RECEIVE COMMAND WORD (RESET ADDRESS POINTER) READ/WRITE DATA BIT AND INCREMENT ADDRESS POINTER 264–BIT TRANSACTION HOLD ADDRESS POINTER VALUE, WAIT FOR NEW ...

Page 5

... TYPICAL CURRENT CONSUMPTION VS. BIT RATE Figure + 100 bps 100 bps TYPICAL LEAKAGE CURRENT VS. TEMPERATURE Figure 7 15 4.0V CC 12.0 9.0 6.0 3.0 0.0 –10 0 +10 DS2223/DS2224 129 pC/BIT 1 kbps 10 kbps 100 kbps BIT RATE +20 +30 +40 +50 +60 +70 TEMPERATURE (DEG. C) 080598 5/10 ...

Page 6

... DS2223/DS2224 1–WIRE INTERFACE The 1–Wire interface has only a single line by definition important that host and EconoRAM be able to drive it at the appropriate time. The EconoRAM is an open drain part with an internal circuit equivalent to that shown in Figure 8. The host can be the same equivalent circuit bidirectional pin is not available, separate output and input pins can be tied together ...

Page 7

... SUGGESTED CIRCUIT Figure Econo Memory GND ICC VS. DQ VOLTAGE Figure 10 SUPPLY CURRENT 400 ( A) 200 PIN VOLTAGE DS2223/DS2224 CAP + C1 CR1 V = +5V CC Room Temperature SUPPLY CURRENT < 080598 7/10 ...

Page 8

... DS2223/DS2224 DATA RETENTION TIME VS. CAPACITANCE Figure 11 CAPACITANCE 10K ( F) 1K 100 TIME (hours) Using Battery Backup 14 mA–Hr => 144 million transactions 2 DATA DS2223 PIN DS2224 080598 8/10 Initial V Voltage 3 5.0 CC 100 1K 10K 3 + 1.5V EVEREADY NO. 321 1 ...

Page 9

... V V 5.5 V PUP 500 (– + =1.4V CC MIN TYP MAX UNITS –0.5 0.2 V 1 5.5 V PUP 500 DS2223/DS2224 NOTES 1 1 NOTES 10%) NOTES 080598 9/10 ...

Page 10

... DS2223/DS2224 AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Time Slot t SLOT Read Data Valid t RDV Release Time t RELEASE Write 1 Low Time t LOW1 Write 0 Low Time t LOW0 Data Setup Time t SU Recovery Time t REC AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Time Slot t SLOT Read Data Valid t RDV ...

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