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STK1743-D25I Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

No. de pieza STK1743-D25I
Descripción Electrónicos  NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK
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Fabricante Electrónico  ETC [List of Unclassifed Manufacturers]
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STK1743-D25I Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

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March 1999
7-1
STK1743
nvTime
8K x 8
AutoStore™ nvSRAM
with Real-Time Clock
FEATURES
• Data Integrity of Simtek nvSRAM Combined
with Full-Featured Real-Time Clock
• Stand-Alone Nonvolatile Memory and Time-
Keeping Solution—No Other Parts Required
• No Batteries to Fail
• Fast 25ns, 35ns and 45ns Access Times
• Software- and
AutoStore™-Controlled
Nonvolatile Cycles
• Year 2000 Compliant with Leap Year
Compensation
• 24-Hour BCD Format
• 100-Year Data Retention over Full Industrial
Temperature Range
• Full 30-Day RTC Operation on Each Power
Loss
• Single 5V
± 10% Power Supply
DESCRIPTION
The Simtek STK1743 DIP module houses 64Kb of
nonvolatile static RAM, a real-time clock (RTC) with
crystal and a high-value capacitor to support sys-
tems that require high reliability and ease of manu-
facturing. READ and WRITE access to all RTC
functions and the memory is the same as a conven-
tional x 8 SRAM. The highest eight addresses of the
RAM
support clock registers for centuries, years,
months, dates, days, hours, minutes and seconds.
Independent data resides in the integral EEPROM at
all times. Automatic RECALL on power up transfers
the EEPROM data to the SRAM, while an automatic
STORE
on power down transfers SRAM data to the
EEPROM
. A software RECALL and STORE are also
possible on user command.
nvTime™ allows unlim-
ited accesses to SRAM, unlimited RECALLs and 106
STORE
s.
BLOCK DIAGRAM
EEPROM ARRAY
128 x 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
128 x 512
STORE/
RECALL
CONTROL
POWER
CONTROL
A6
A7
A11
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
SOFTWARE
DETECT
VCC
A0 - A12
G
E
W
A9
A8
A10
A3
A2
A0 A1
A4
A5
RTC
MUX
A0 -
A12
PIN CONFIGURATIONS
NC
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
VCC
NC
A8
A9
A11
G
W
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
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
600 mil
Dual
In-Line
Module
PIN NAMES
A0 - A12
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
VCC
Power (+ 5V)
VSS
Ground
ADVANCE


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