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PDF DS1258Y Data sheet ( Hoja de datos )

Número de pieza DS1258Y
Descripción 128k x 16 Nonvolatile SRAM
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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DS1258Y/AB
128k x 16 Nonvolatile SRAM
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
§ 10-Year Minimum Data Retention in the
Absence of External Power
§ Data is Automatically Protected During a
Power Loss
§ Separate Upper Byte and Lower Byte Chip-
Select Inputs
§ Unlimited Write Cycles
§ Low-Power CMOS
§ Read and Write Access Times as Fast as 70ns
§ Lithium Energy Source is Electrically
Disconnected to Retain Freshness Until
Power is Applied for the First Time
CEU
CEL
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
GND
DQ7
DQ6
DQ5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
40 VCC
39 WE
38 A16
37 A15
36 A14
35 A13
34 A12
33 A11
32 A10
31 A9
30 GND
29 A8
28 A7
27 A6
§ Full ±10% Operating Range (DS1258Y)
§ Optional ±5% Operating Range (DS1258AB)
§ Optional Industrial Temperature Range of
-40°C to +85°C, Designated IND
DQ4
DQ3
DQ2
DQ1
DQ0
15
16
17
18
19
26 A5
25 A4
24 A3
23 A2
22 A1
OE 20
21 A0
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40-Pin Encapsulated Package
740mil Extended
PIN DESCRIPTION
A0 to A16
- Address Inputs
DQ0 to DQ15
- Data In/Data Out
CEU - Chip Enable Upper Byte
CEL - Chip Enable Lower Byte
WE - Write Enable
OE - Output Enable
VCC
GND
- Power (+5V)
- Ground
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DESCRIPTION
The DS1258 128k x 16 nonvolatile (NV) SRAMs are 2,097,152-bit fully static, NV SRAMs, organized as
131,072 words by 16 bits. Each NV SRAM has a self-contained lithium energy source and control
circuitry that constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs,
the lithium energy source is automatically switched on and write protection is unconditionally enabled to
prevent data corruption. DIP-package DS1258 devices can be used in place of solutions that build NV
128k x 16 memory by utilizing a variety of discrete components. There is no limit on the number of write
cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.
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DS1258Y pdf
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WRITE CYCLE 1
DS1258Y/AB
SEE NOTE 2, 3, 4, 6, 7, 8 AND 12
WRITE CYCLE 2
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