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DS1243Y Datasheet

  • DS1243Y

  • 64K NV SRAM with Phantom Clock

  • 349.23KB

  • Dallas

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DS1243Y
64K NV SRAM with Phantom Clock
www.dalsemi.com
FEATURES
搂
Real time clock keeps track of hundredths of
seconds, seconds, minutes, hours, days, date
of the month, months, and years
搂
8K x 8 NV SRAM directly replaces volatile
static RAM or EEPROM
搂
Embedded lithium energy cell maintains
calendar operation and retains RAM data
搂
Watch function is transparent to RAM
operation
搂
Month and year determine the number of days
in each month; valid up to 2100
搂
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
搂
Standard 28鈥損in JEDEC pinout
搂
Full 卤10% operating range
搂
Operating temperature range 0掳C to 70掳C
搂
Accuracy is better than 卤1 minute/month @
25掳C
搂
Over 10 years of data retention in the absence
of power
搂
Available in 120, 150 and 200 ns access time
PIN ASSIGNMENT
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
WE
NC
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
28-Pin Encapsulated Package
720-Mil Extended
PIN DESCRIPTION
A
0
鈥揂
12
CE
GND
DQ
0
鈥揇Q
7
V
CC
WE
OE
ORDERING INFORMATION
DS1243Y鈥揦XX
鈥?20 120 ns access
鈥?50 150 ns access
200 ns access
NC
RST
鈥?Address Inputs
鈥?Chip Enable
鈥?Ground
鈥?Data In/Data Out
鈥?Power (+5V)
鈥?Write Enable
鈥?Output Enable
鈥?No Connect
鈥?Reset
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鈥搃n real time clock. The DS1243Y has a self鈥揷ontained lithium energy source
and control circuitry which constantly monitors V
CC
for an out鈥搊f鈥搕olerance 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.
1 of 13
080299

DS1243Y PDF文件相关型号

DS1243Y-120,DS1243Y-150

DS1243Y 产品属性

  • Maxim Integrated Products

  • Clock, Calendar, NV Timekeeping RAM

  • Phantom Clock, Parallel

  • HH:MM:SS:hh

  • 8192 B

  • 5.5 V

  • 4.5 V

  • + 70 C

  • 0 C

  • Through Hole

  • eDIP

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