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DS1645AB100 Datasheet

  • DS1645AB100

  • IC-1M CMOS NVRAM

  • 12頁(yè)

  • ETC

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DS1645Y/AB
DS1645Y/AB
Partitionable 1024K NV SRAM
FEATURES
PIN ASSIGNMENT
NC
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A15
NC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
鈥?/div>
10 years minimum data retention in the absence of
external power
鈥?/div>
Data is automatically protected during power loss
鈥?/div>
Directly replaces 128K x 8 volatile static RAM
鈥?/div>
Write protects selected blocks of memory when pro-
grammed
鈥?/div>
Unlimited write cycles
鈥?/div>
Low鈥損ower CMOS
鈥?/div>
Read and write access times as fast as 70 ns
鈥?/div>
Lithium energy source is electrically disconnected to
retain freshness until power is applied for the first time
鈥?/div>
Full +10% V
CC
operating range (DS1645Y)
鈥?/div>
Optional +5% V
CC
operating range (DS1645AB)
鈥?/div>
Optional
industrial temperature range of 鈥?0
擄
C to
擄
C, designated IND
+85
NC
A15
A16
PFO
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
32鈥揚(yáng)IN ENCAPSULATED PACKAGE
740 MIL EXTENDED
鈥?/div>
JEDEC standard 32鈥損in DIP package
鈥?/div>
Low Profile Module (LPM) package
鈥?Fits into standard 68鈥損in PLCC surface mount-
able socket
鈥?250 mil package height
鈥?Power Fail Output (PFO) warns system of
impending V
CC
power failure
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
34鈥揚(yáng)IN LOW PROFILE MODULE (LPM)
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
ECopyright
1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
041497 1/12

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