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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1244 Datasheet

256K NV SRAM

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19-6077; Rev 11/11
www.maxim-ic.com
DS1244/DS1244P
256K NV SRAM with Phantom Clock
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
Automatic Leap Year Compensation Valid
Up to 2100
Full 10% Operating Range
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 Laboratories (UL) Recognized
PIN CONFIGURATIONS
TOP VIEW
A14/RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
DS1244
28
27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
EDIP Module
(740 mils)
VCC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
RST
N.C.
N.C.
N.C.
VCC
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
DS1244P
X1 GND VBAT X2
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
PowerCap Module
(Uses DS9034PCX+ PowerCap)
N.C.
N.C.
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
1 of 20


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1244 Datasheet

256K NV SRAM

No Preview Available !

TYPICAL OPERATING CIRCUIT
DS1244/DS1244P
ORDERING INFORMATION
PART
TEMP RANGE
DS1244W-120+
DS1244W-120IND+
DS1244WP-120+
DS1244WP-120IND+
DS1244Y-70+
DS1244YP-70+
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 EDIP (0.740a)
28 EDIP (0.740a)
34 PowerCap*
34 PowerCap*
28 EDIP (0.740a)
34 PowerCap*
VOLTAGE
(V)
3.3
3.3
3.3
3.3
5.0
5.0
+Denotes a lead(Pb)-free/RoHS-compliant device.
*DS9034PCX+ or DS9034I-PCX+ (PowerCap) required. (Must be ordered separately.)
2 of 20


Part Number DS1244
Description 256K NV SRAM
Maker Maxim Integrated
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DS1244 Datasheet PDF






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