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PDF DS1244P Data sheet ( Hoja de datos )
| Número de pieza | DS1244P | |
| Descripción | 256k NV SRAM with Phantom Clock | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1244P (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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www.maxim-ic.com
www.maxim-ic.com
FEATURES
§ Real-time clock (RTC) keeps track of
hundredths of seconds, minutes, hours, days,
date of the month, months, and years
§ 32k x 8 NV SRAM directly replaces volatile
static RAM or EEPROM
§ Embedded lithium energy cell maintains
calendar operation and retains RAM data
§ Watch function is transparent to RAM
operation
§ Month and year determine the number of
days in each month; valid up to 2100
§ Full 10% operating range
§ Operating temperature range: 0°C to +70°C
§ Over 10 years of data retention in the
absence of power
§ Lithium energy source is electrically
disconnected to retain freshness until power
is applied for the first time
§ DIP module only
§ Standard 28-pin JEDEC pinout
§ PowerCap® module board only
– Surface mountable package for direct
connection to PowerCap containing
battery and crystal
– Replaceable battery (PowerCap)
– Pin-for-pin compatible with DS1248P
and DS1251P
§ Underwriters Laboratory (UL) recognized
DS1244/DS1244P
256k NV SRAM
with Phantom Clock
PIN ASSIGNMENT (Top View)
A14/RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
1
2
3
4
5
6
7
8
9
10
11
12
28 VCC
27 WE
26 A13
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
DQ2 13
16 DQ4
GND 14
15 DQ3
DS2144
28-PDIP Module (740mil)
RST
N.C.
N.C.
NV.CCC.
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
15
16
17
X1 GND VBAT X2
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
N.C.
N.C.
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
DS1244P
34-Pin PowerCap Module
(Uses DS9034PCX PowerCap)
Package Dimension Information
http://www.maxim-ic.com/TechSupport/DallasPackInfo.htm
PowerCap is a registered trademark of Dallas Semiconductor.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: http://www.maxim-ic.com/errata.
1 of 19
081902
1 page  
Figure 1. PHANTOM CLOCK REGISTER DEFINITION
DS1244/DS1244P
Note: The pattern recognition in hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being
accidentally duplicated and causing inadvertent entry to the phantom clock is less than 1 in 1019. This
pattern is sent to the phantom clock LSB to MSB.
5 of 19
5 Page 
DS1244/DS1244P
MEMORY AC ELECTRICAL CHARACTERISTICS
Over the operating range (3.3V)
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 from WE
SYMBOL
tRC
tACC
tOE
tCO
tCOE
tOD
tOH
tWC
tWP
tAW
tWR
tODW
tOEW
tDS
tDH
DS1244W-120
MIN
MAX
120
120
60
120
5
40
5
120
90
0
20
40
5
50
20
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
5
5
3
10
5
5
4
4
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
Over the operating range (3.3V)
PARAMETER
Read Cycle Time
CE Access Time
OE Access Time
CE to Output Low-Z
OE to Output Low-Z
CE to Output High-Z
OE to Output High-Z
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
CE Pulse Width
RESET Pulse Width
SYMBOL
tRC
tCO
tOE
tCOE
tOEE
tOD
tODO
tRR
tWC
tWP
tWR
tDS
tDH
tCW
tRST
MIN
120
5
5
20
120
100
20
45
0
105
120
TYP
MAX
100
100
40
40
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
5
5
3
10
4
4
11 of 19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet DS1244P.PDF ] | |
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