DS1217 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS1217 Datasheet PDF : 8 Pages
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DS1217A
DS1217A
Nonvolatile Read/Write Cartridge
FEATURES
• User-insertable
• Capacity up to 32K x 8
• Standard bytewide pinout facilitates connection to
JEDEC 28-pin DIP socket via ribbon cable
• Data retention greater than 10 years
• 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
Position
Name
Ground A1
+5 Volts A2
Write Enable A3
Address 13 A4
Address 8 A5
Address 9 A6
Address 11 A7
Output Enable A8
Address 10 A9
Cartridge Enable A10
Data I/O 7 A11
Data I/O 6 A12
Data I/O 5 A13
Data I/O 4 A14
Data I/O 3 A15
B1 No Connect
B2 Address 14
B3 Address 12
B4 Address 7
B5 Address 6
B6 Address 5
B7 Address 4
B8 Address 3
B9 Address 2
B10 Address 1
B11 Address 0
B12 Data I/O 0
B13 Data I/O 1
B14 Data I/O 2
B15 Ground
OFF – ON
3”
DESCRIPTION
The DS1217A is a nonvolatile RAM designed for porta-
ble applications requiring a rugged and durable pack-
age. The nonvolatile cartridge is available in densities
ranging from 2K x 8 to 32K x 8 in 8K byte increments. A
card edge connector is required for connection to a host
system. A standard 30-pin connector can be used for di-
rect mount to a printed circuit board. Alternatively, re-
mote mounting can be accomplished with a 28-conduc-
tor ribbon cable terminated with a 28-pin DIP plug. The
A1
B1
See Mech. Drawings Section
remote method can be used to retrofit existing systems
that have JEDEC 28-pin bytewide memory sites.
The DS1217A cartridge has a lifetime energy source to
retain data and circuitry needed to automatically protect
memory contents. Reading and writing the memory lo-
cations is the same as using conventional static RAM. If
the user wants to convert from read/write memory to
read-only memory, a manual switch is provided to un-
conditionally protect memory contents.
030598 1/8
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