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PDF DS1245AB Data sheet ( Hoja de datos )
| Número de pieza | DS1245AB | |
| Descripción | 1024k Nonvolatile SRAM | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1245Y/AB
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 70 ns
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
Full ±10% VCC operating range (DS1245Y)
Optional ±5% VCC operating range
(DS1245AB)
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 (+5V)
- Ground
NC - No Connect
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111899
1 page  
AC ELECTRICAL
CHARACTERISTICS
PARAMETER
Read Cycle Time
Access Time
OE to Output Valid
CE to Output Valid
OE or CE to Output Active
Output High Z from Deselection
Output Hold from Address Change
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
Output High Z from WE
Output Active from WE
Data Setup Time
Data Hold Time
DS1245Y/AB
(VCC=5V ±=5% for DS1245AB)
(tA: See Note 10) (VCC=5V ±=10% for DS1245Y)
DS1245AB-100 DS1245AB-120
DS1245Y-100 DS1245Y-120
SYMBOL MIN MAX MIN MAX UNITS NOTES
tRC 100
120
ns
tACC 100 120 ns
tOE 50 60 ns
tCO 100 120 ns
tCOE
5
5
ns 5
tOD
35
35 ns
5
tOH 5 5 ns
tWC 100
120
ns
tWP 75
90
ns 3
tAW 0 0 ns
tWR1
tWR2
5
15
5
15
ns 12
ns 13
tODW
35
35 ns
5
tOEW
5
5
ns 5
tDS 40
50
ns 4
tDH1
0
tDH2 10
0
10
ns 12
ns 13
5 of 12
5 Page 
DS1245Y/AB
DS1245Y/AB NONVOLATILE SRAM, 34-PIN POWERCAP MODULE WITH
POWERCAP
PKG
DIM
A
B
C
D
E
F
G
MIN
0.920
0.955
0.240
0.052
0.048
0.015
0.020
INCHES
NOM
0.925
0.960
0.245
0.055
0.050
0.020
0.025
MAX
0.930
0.965
0.250
0.058
0.052
0.025
0.030
ASSEMBLY AND USE
Reflow soldering
Dallas Semiconductor recommends that PowerCap Module bases experience one pass through solder
reflow oriented label-side up (live-bug).
Hand soldering and touch-up
Do not touch soldering iron to leads for more than 3 seconds. To solder, apply flux to the pad, heat the
lead frame pad and apply solder. To remove part, apply flux, heat pad until solder reflows, and use a
solder wick.
LPM replacement in a socket
To replace a Low Profile Module in a 68-pin PLCC socket, attach a DS9034PC PowerCap to a module
base then insert the complete module into the socket one row of leads at a time, pushing only on the
corners of the cap. Never apply force to the center of the device. To remove from a socket, use a PLCC
extraction tool and ensure that it does not hit or damage any of the module IC components. Do not use
any other tool for extraction.
11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS1245AB.PDF ] | |
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