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Dallas Semiconducotr - 256k NV SRAM with Phantom Clock

Numéro de référence DS1244
Description 256k NV SRAM with Phantom Clock
Fabricant Dallas Semiconducotr 
Logo Dallas Semiconducotr 





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DS1244 fiche technique
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.
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