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DS2223 Datasheet, PDF (1/10 Pages) Dallas Semiconductor – EconoRAM | |||
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DS2223/DS2224
DS2223/DS2224
EconoRAM
FEATURES
⢠Lowâcost, generalâpurpose, 256âbit memory
â DS2223 has 256âbit SRAM
â DS2224 has 32âbit ROM, 224âbit SRAM
⢠Reduces control, address and data interface to a
single pin
⢠Each DS2224 32âbit ROM is factoryâlasered 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 lowâ
cost alkaline batteries or capacitors
⢠Directly connects to a port pin of popular microcontrol-
lers
⢠Operation from 1.2 to 5.5 volts
⢠Popular TOâ92 or SOTâ223 surface mount package
⢠Operates over industrial temperature range â40°C to
+85°C
PACKAGE OUTLINE
TOâ92
12 3
SOTâ223
1
123
BOTTOM VIEW
See Mech. Drawings
Section
24 3
TOP VIEW
See Mech. Drawings
Section
PIN CONNECTIONS
Pin 1 GND â Ground
Pin 2 DQ
â Data In/Out
Pin 3
Pin 4
VCC
GND
â Supply
â Ground
DESCRIPTION
The DS2223 and DS2224 EconoRAMs are fully static,
microâpowered, read/write memories in lowâcost
TOâ92 or SOTâ223 packages. The DS2223 is orga-
nized as a serial 256 x 1 bit static read/write memory.
The DS2224âs 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.
ORDERING INFORMATION
DS2223
DS2223Z
DS2223T
DS2223Y
DS2224
DS2224Z
DS2224T
DS2224Y
256âbit SRAM â TOâ92 Package
256âbit SRAM â SOTâ223 Package
1000 piece tapeâandâreel of DS2223
2500 piece tapeâandâreel of DS2223Z
32âbit serial number (ROM), 224âbit
SRAM â TOâ92 Package
32âbit serial number (ROM), 224âbit
SRAM â SOTâ223 Package
1000 piece tapeâandâreel of DS2224
2500 piece tapeâandâreel of DS2224Z
080598 1/10
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