ds1244y Maxim Integrated Products, Inc., ds1244y Datasheet
ds1244y
Manufacturer Part Number
ds1244y
Description
256k Sram With Phantom Clock
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS1244Y.pdf
(12 pages)
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FEATURES
ORDERING INFORMATION
DESCRIPTION
The DS1244Y 256K NV SRAM with Phantom Clock is a
fully static nonvolatile RAM (organized as 32,768 words
by 8 bits) with a built–in real time clock. The DS1244Y
has a self–contained lithium energy source and control
circuitry which constantly monitors V
tolerance condition. When such a condition occurs, the
lithium energy source is automatically switched on and
write protection is unconditionally enabled to prevent
garbled data in both the memory and real time clock.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS1244Y–XXX
DS1244Y
Real time clock 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 op-
eration and retains RAM data
Watch function is transparent to RAM operation
Month and year determine the number of days in each
month; volid up to 1200
Standard 28–pin JEDEC pinout
Full 10% operating range
Operating temperature range 0 C to 70 C
Accuracy is better than 1 minute/month @ 25 C
Over 10 years of data retention in the absence of
power
Available in 120, 150 and 200 ns access time
Copyright 1997 by Dallas Semiconductor Corporation.
–120
–150
120 ns access
150 ns access
200 ns access
CC
for an out–of–
256K NV SRAM with Phantom Clock
PIN ASSIGNMENT
PIN DESCRIPTION
A
CE
GND
DQ
V
WE
OE
NC
RST
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 less 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.
o
CC
–A
0-
DQ
14
A14/RST
7
GND
DQ0
DQ1
DQ2
A12
28–PIN ENCAPSULATED PACKAGE
A7
A6
A5
A4
A3
A2
A1
A0
– Address Inputs
– Chip Enable
– Ground
– Data In/Data Out
– Power (+5V)
– Write Enable
– Output Enable
– No Connect
– Reset
1
2
3
4
5
6
7
8
9
10
11
12
13
14
740 MIL EXTENDED
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DS1244Y
V
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
CC
032697 1/12
DS1244Y
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