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PDF DS2224 Data sheet ( Hoja de datos )

Número de pieza DS2224
Descripción EconoRAM
Fabricantes Dallas Semiconducotr 
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No Preview Available ! DS2224 Hoja de datos, Descripción, Manual

DS2223/DS2224
DS2223/DS2224
EconoRAM
FEATURES
Low–cost, general–purpose, 256–bit memory
– DS2223 has 256–bit SRAM
– DS2224 has 32–bit ROM, 224–bit SRAM
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
PACKAGE OUTLINE
TO–92
12 3
SOT–223
1
123
BOTTOM VIEW
See Mech. Drawings
Section
24 3
TOP VIEW
See Mech. Drawings
Section
PIN CONNECTIONS
Pin 1 GND – Ground
Pin 2 DQ
– Data In/Out
Pin 3
Pin 4
VCC
GND
– Supply
– Ground
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.
ORDERING INFORMATION
DS2223
DS2223Z
DS2223T
DS2223Y
DS2224
DS2224Z
DS2224T
DS2224Y
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
080598 1/10

1 page




DS2224 pdf
TYPICAL CURRENT CONSUMPTION VS. BIT RATE Figure 6
DS2223/DS2224
10 µA
4V @ +25°C
1 µA
100 nA
129 pC/BIT
10 nA
5 nA
10 bps
100 bps
1 kbps
BIT RATE
10 kbps
100 kbps
TYPICAL LEAKAGE CURRENT VS. TEMPERATURE Figure 7
15.0
VCC = 4.0V
12.0
9.0
6.0
3.0
0.0
–10
0 +10 +20 +30 +40 +50 +60 +70
TEMPERATURE (DEG. C)
080598 5/10

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