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DS1251 Datasheet

  • DS1251

  • 4096k NV SRAM with Phantom Clock

  • 279.44KB

  • Dallas   Dallas

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DS1251/DS1251P
4096k NV SRAM with Phantom Clock
www.maxim-ic.com
FEATURES
摟
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Real-time clock keeps track of hundredths of
seconds, minutes, hours, days, date of the
month, months, and years
512k 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
Over 10 years of data retention in the
absence of power
Full 10% operating range
Lithium energy source is electrically
disconnected to retain freshness until power
is applied for the first time
DIP Module only
鈥?Standard 32-pin JEDEC pinout
鈥?Upward comparable with the DS1248
PowerCap
廬
Module Board only
鈥?Surface mountable package for direct
connection to PowerCap containing
battery and crystal
鈥?Replaceable battery (PowerCap)
鈥?Pin for pin compatible with other densities
of DS124XP phantom clocks
PIN ASSIGNMENT
A18/RST
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
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
32-Pin Encapsulated Package
740mil Flush
RST
A15
A16
NC
V
CC
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 V
BAT
X2
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A18
A17
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
PowerCap is a registered trademark of Dallas Semiconductor.
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