Rainbow Electronics DS1251Y User Manual
Features, Pin assignment
1 of 22
112801
FEATURES
§ 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
– Standard 32-pin JEDEC pinout
– Upward comparable with the DS1248
§ PowerCap
®
Module Board only
– Surface mountable package for direct
connection to PowerCap containing
battery and crystal
– Replaceable battery (PowerCap)
– Pin for pin compatible with other densities
of DS124XP phantom clocks
PIN ASSIGNMENT
DS1251/DS1251P
4096k NV SRAM with Phantom Clock
www.maxim-ic.com
13
1
2
3
4
5
6
7
8
9
10
11
12
14
31
32-Pin Encapsulated Package
740mil Flush
A14
A7
A5
A4
A3
A2
A1
A0
DQ1
DQ0
V
CC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ5
DQ6
32
30
29
28
27
26
25
24
23
22
21
19
20
A16
A12
A6
A18/RST
DQ2
GND
15
16
18
17
DQ4
DQ3
1
RST
2
3
A15
A16
NC
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
4
5
6
7
8
9
10
11
12
13
14
15
16
17
A17
A14
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34
A18
X1 GND V
BAT
X2
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
PowerCap is a registered trademark of Dallas Semiconductor.