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Dallas Semiconducotr - 4096K NV SRAM with Phantom Clock

Numéro de référence DS1251Y
Description 4096K NV SRAM with Phantom Clock
Fabricant Dallas Semiconducotr 
Logo Dallas Semiconducotr 





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DS1251Y fiche technique
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DS1251Y
DS1251Y
4096K NV SRAM with Phantom Clock
FEATURES
PIN ASSIGNMENT
Real time clock keeps track of hundredths of seconds,
minutes, hours, days, date of the month, months, and
years
512K x 8 NV SRAM directly replaces volatile static
RAM or EEPROM
A18/RST
A16
A14
A12
A7
1
2
3
4
5
32 VCC
31 A15
30 A17
29 WE
28 A13
Embedded lithium energy cell maintains calendar op-
eration and retains RAM data
Watch function is transparent to RAM operation
A6 6
A5 7
A4 8
A3 9
27 A8
26 A9
25 A11
24 OE
Month and year determine the number of days in each
month; valid up to 2100
Standard 32–pin JEDEC pinout
A2
A1
A0
DQ0
10
11
12
13
23 A10
22 CE
21 DQ7
20 DQ6
Full 10% operating range
DQ1
DQ2
Operating temperature range 0°C to 70°C DataSheet4U.com GND
14
15
16
19 DQ5
18 DQ4
17 DQ3
Accuracy is better than ±1 minute/month @ 25°C
32–PIN ENCAPSULATED PACKAGE
740 MIL FLUSH
Over 10 years of data retention in the absence of
power
PIN DESCRIPTION
Available in 120 ns and 150 ns access time
ORDERING INFORMATION
DS1251Y–120 120 ns access
DS1251Y–150 150 ns access
A0–A18
CE
GND
DQ0–DQ7
VCC
WE
OE
RST
– Address Inputs
– Chip Enable
– Ground
– Data In/Data Out
– Power (+5V)
– Write Enable
– Output Enable
– Reset
DataShee
DESCRIPTION
The DS1251Y 4096K NV SRAM with Phantom Clock is
a fully static nonvolatile RAM (organized as 512K words
by 8 bits) with a built–in real time clock. The DS1251Y
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
garbled data in both the memory and real time clock.
DataSheet4U.com
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.
ECopyright 1997 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
DataSheet 4 U .compatents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
032697 1/12

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