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PDF DS1217M Data sheet ( Hoja de datos )
| Número de pieza | DS1217M | |
| Descripción | Nonvolatile Read/Write Cartridge | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1217M
DS1217M
Nonvolatile Read/Write Cartridge
FEATURES
• User-insertable
• Data retention greater than 5 years
• Capacity up to 512K x 8
• Standard bytewide pinout facilitates connection to
JEDEC 28-pin DIP via ribbon cable
• Software-controlled banks maintain 32 x 8 JEDEC
28-pin compatibility
• Multiple cartridges can reside on a common bus
• Automatic write protection circuitry safeguards
against data loss
• Manual switch unconditionally protects data
• Compact size and shape
• Rugged and durable
• Wide operating temperature range of 0°C to 70°C
PIN ASSIGNMENT
Name
Ground
+5 Volts
Write Enable
Address 13
Address 8
Address 9
Address 11
Output Enable
Address 10
Cartridge Enable
Data I/O 7
Data I/O 6
Data I/O 5
Data I/O 4
Data I/O 3
Position
Name
A1 B1 No Connect
A2 B2 Address 14
A3 B3 Address 12
A4 B4 Address 7
A5 B5 Address 6
A6 B6 Address 5
A7 B7 Address 4
A8 B8 Address 3
A9 B9 Address 2
A10 B10 Address 1
A11 B11 Address 0
A12 B12 Data I/O 0
A13 B13 Data I/O 1
A14 B14 Data I/O 2
A15 B15 Ground
N
3”
A1
B1
See Mech. Drawings Section
DESCRIPTION
The DS1217M is a nonvolatile RAM designed for porta-
ble applications requiring a rugged and durable pack-
age. The Nonvolatile Cartridge has memory capacities
from 64K x 8 to 512K x 8. The cartridge is accessed in
continuous 32K byte banks. Bank switching is accom-
plished under software control by pattern recognition
from the address bus. A card edge connector is required
for connection to a host system. A standard 30-pin con-
nector can be used for direct mount to a printed circuit
board. Alternatively, remote mounting can be accom-
plished with a ribbon cable terminated with a 28-pin DIP
plug. The remote method can be used to retrofit existing
systems which have JEDEC 28-pin bytewide memory
sites.
030598 1/8
1 page  
DS1217M
AC ELECTRICAL CHARACTERISTICS
(0°C to 70°C; VCC = 5V+ 10%)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
Read Cycle Time
Access Time
OE to Output Valid
CE to Output Valid
OE or CE to Output Active
Output High Z From Deselection
Output Hold From
Address Change
tRC
tACC
tOE
tCO
tCOE
tOD
tOH
250
5
5
ns
250 ns
125 ns
210 ns
ns
125 ns
ns
5
5
Read Recovery Time
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
Output High Z From WE
Output Active From WE
Data Setup Time
Data Hold Time From WE
tRR
tWC
tWP
tAW
tWR
tODW
tOEW
tDS
tDH
40
250
170
0
20
5
100
20
ns
ns
ns
ns
ns
100 ns
ns
ns
ns
3
5
5
4
4
030598 5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS1217M.PDF ] | |
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