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DS1217A Datasheet

  • DS1217A

  • Nonvolatile Read/Write Cartridge

  • 76.41KB

  • Dallas   Dallas

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DS1217A
DS1217A
Nonvolatile Read/Write Cartridge
FEATURES
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
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
Name
No Connect
Address 14
Address 12
Address 7
Address 6
Address 5
Address 4
Address 3
Address 2
Address 1
Address 0
Data I/O 0
Data I/O 1
Data I/O 2
Ground
鈥?/div>
User-insertable
鈥?/div>
Capacity up to 32K x 8
鈥?/div>
Standard
bytewide pinout facilitates connection to
JEDEC 28-pin DIP socket via ribbon cable
鈥?/div>
Data retention greater than 10 years
鈥?/div>
Automatic
write protection circuitry safeguards
against data loss
鈥?/div>
Manual switch unconditionally protects data
鈥?/div>
Compact size and shape
鈥?/div>
Rugged and durable
鈥?/div>
Wide operating temperature range of 0擄C to 70擄C
OFF 鈥?ON
3鈥?/div>
A1
B1
See Mech. Drawings Section
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
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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