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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1243Y Datasheet

64K NV SRAM

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19-6076; Rev 11/11
DS1243Y
64K NV SRAM with Phantom Clock
FEATURES
Real-Time Clock Keeps Track of Hundredths
of Seconds, Seconds, Minutes, Hours, Days,
Date of the Month, Months, and Years
8K 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
Lithium Energy Source is Electrically
Disconnected to Retain Freshness Until
Power is Applied for the First Time
Standard 28-Pin JEDEC Pinout
Full ±10% Operating Range
Accuracy is Better than ±1 Minute/Month at
+25°C
Over 10 Years of Data Retention in the
Absence of Power
Available in 120ns Access Time
Underwriters Laboratories (UL) Recognized
(www.maxim-ic.com/qa/info/ul)
PIN CONFIGURATION
TOP VIEW
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1 28
2
3
DS1243Y
27
26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
WE
N.C.
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
Encapsulated Package
(720-Mil Extended)
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS1243Y-120+ 0°C to +70°C 28 EDIP (0.720a)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
1 of 14


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1243Y Datasheet

64K NV SRAM

No Preview Available !

PIN DESCRIPTION
PIN NAME
FUNCTION
1
RST
Active-Low Reset Input. This pin has an internal pullup resistor
connected to VCC.
2 A12
3 A7
4 A6
5 A5
6 A4
7 A3
8 A2 Address Inputs
9 A1
10 A0
23 A11
21 A10
24 A9
25 A8
11 DQ0
12 DQ1
13 DQ2
15
16
DQ3
DQ4
Data In/Data Out
17 DQ5
18 DQ6
19 DQ7
20 CE Active-Low Chip-Enable Input
22 OE Active-Low Output-Enable Input
26 N.C. No Connection
27 WE Active-Low Write-Enable Input
28 VCC Power-Supply Input
14 GND Ground
DS1243Y
DESCRIPTION
The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192
words by 8 bits) with a built-in real time clock. The DS1243Y has a self-contained lithium energy source
and control circuitry, which constantly monitors VCC for an out-of-tolerance condition. When such a
condition occurs, the lithium energy source is automatically switched on and write protection is
unconditionally enabled to prevent corrupted data in both the memory and real time clock. The Phantom
Clock provides timekeeping information including hundredths of seconds, seconds, minutes, hours, day,
date, month, and year information. The date at the end of the month is automatically adjusted for months
with fewer than 31 days, including correction for leap years. The Phantom Clock operates in either
24-hour or 12-hour format with an AM/PM indicator.
2 of 14


Part Number DS1243Y
Description 64K NV SRAM
Maker Maxim Integrated
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DS1243Y Datasheet PDF






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Maxim Integrated





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