DS1244YP Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS1244YP Datasheet PDF : 21 Pages
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DS1244/DS1244P
256k NV SRAM with Phantom Clock
www.maxim-ic.com
FEATURES
§ Real-time clock 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
PowerCap is a registered trademark of Dallas Semiconductor.
PIN ASSIGNMENT
A14/RST 1
A12 2
A7 3
A6 4
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
DQ0 11
DQ1 12
DQ2 13
GND 14
28
VCC
27
WE
26 A13
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
28-Pin Encapsulated Package
740mil Extended
RST 1
34
NC
NC 2
33
NC
NC 3
NC 4
VCC
WE
5
6
OE 7
CE
DQ7
8
9
32
A14
31
A13
30
A12
29
A11
28
A10
27
A9
26
A8
DQ6 10
25
A7
DQ5 11
DQ4 12
24
A6
23
A5
DQ3 13
22
A4
DQ2
DQ1
DQ0
14
21
15
16
X1 GND VBAT X2
20
19
A3
A2
A1
GND 17
18
A0
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
1 of 21
112801
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