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PDF DS1245W Data sheet ( Hoja de datos )
| Número de pieza | DS1245W | |
| Descripción | 3.3V 1024k Nonvolatile SRAM | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1245W
3.3V 1024k Nonvolatile SRAM
FEATURES
10 years minimum data retention in the
absence of external power
Data is automatically protected during power
loss
Replaces 128k x 8 volatile static RAM,
EEPROM or Flash memory
Unlimited write cycles
Low-power CMOS
Read and write access times as fast as 150 ns
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
Optional industrial temperature range of
-40°C to +85°C, designated IND
JEDEC standard 32-pin DIP package
New PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
lithium backup battery
- Standardized pinout for all nonvolatile
SRAM products
- Detachment feature on PowerCap allows
easy removal using a regular screwdriver
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 VCC
31 A15
30 NC
29 WE
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 DQ7
20 DQ6
19 DQ5
18 DQ4
17 DQ3
32-PIN ENCAPSULATED PACKAGE
740-MIL EXTENDED
NC
A15
A16
NC
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND VBAT
15
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
34-PIN POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
PIN DESCRIPTION
A0 - A16
- Address Inputs
DQ0 - DQ7
- Data In/Data Out
CE - Chip Enable
WE - Write Enable
OE - Output Enable
VCC
GND
- Power (+3.3V)
- Ground
NC - No Connect
1 of 11
111899
1 page  
WRITE CYCLE 1
\SEE NOTES 2, 3, 4, 6, 7, 8 AND 12
DS1245W
5 of 11
5 Page 
RECOMMENDED POWERCAP MODULE LAND PATTERN
DS1245W
PKG
DIM
A
B
C
D
E
INCHES
MIN
NOM
MAX
- 1.050 -
- 0.826 -
- 0.050 -
- 0.030 -
- 0.112 -
RECOMMENDED POWERCAP MODULE SOLDER STENCIL
PKG
DIM
A
B
C
D
E
INCHES
MIN NOM
- 1.050
- 0.890
- 0.050
- 0.030
- 0.080
MAX
-
-
-
-
-
11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DS1245W.PDF ] | |
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