Rainbow Electronics DS1244Y User Manual
Features, Pin assignment (top view), Package dimension information
1 of 19
081902
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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
PowerCap is a registered trademark of Dallas Semiconductor.
PIN ASSIGNMENT (Top View)
Package Dimension Information
V
CC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ3
DQ4
1
2
3
4
5
6
7
8
9
10
11
12
14
13
28
27
26
25
24
23
22
21
20
19
18
17
15
16
A14/RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
GND
DQ2
3
N.C.
N.C.
WE
CE
DQ7
DQ6
DQ4
DQ3
DQ1
DQ0
4
6
7
8
10
11
12
14
15
16
N.C.
33
32
31
29
27
25
24
22
21
20
18
A12
A11
A9
A8
A6
A5
A2
A4
A0
1
V
CC
28
A1
RST
2
N.C.
OE
DQ5
DQ2
GND
5
9
13
17
A14
30
26
23
19
A13
A10
A7
A3
34
N.C.
X1 GND V
BAT
X2
(Uses DS9034PCX PowerCap)
DS1244/DS1244P
256k NV SRAM
with Phantom Clock
www.maxim-ic.com
www.maxim-ic.com