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STK1743-D45I Datasheet

  • STK1743-D45I

  • NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK

  • 240.91KB

  • 10頁

  • ETC

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STK1743
nvTime
鈩?/div>
8K x 8
AutoStore
鈩?nvSRAM
with Real-Time Clock
ADVANCE
FEATURES
鈥?Data Integrity of Simtek nvSRAM Combined
with Full-Featured Real-Time Clock
鈥?Stand-Alone Nonvolatile Memory and Time-
Keeping Solution鈥擭o Other Parts Required
鈥?No Batteries to Fail
鈥?Fast 25ns, 35ns and 45ns Access Times
鈥?Software- and
AutoStore
鈩?Controlled
Nonvolatile Cycles
鈥?Year 2000 Compliant with Leap Year
Compensation
鈥?24-Hour BCD Format
鈥?100-Year Data Retention over Full Industrial
Temperature Range
鈥?Full 30-Day RTC Operation on Each Power
Loss
鈥?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
鈩?allows unlim-
ited accesses to
SRAM
, unlimited
RECALL
s and 10
6
STORE
s.
BLOCK DIAGRAM
EEPROM ARRAY
128 x 512
ROW DECODER
V
CC
STORE/
RECALL
CONTROL
PIN CONFIGURATIONS
NC
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
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
A
5
A
6
A
7
A
8
A
9
A
11
A
12
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
STORE
STATIC RAM
ARRAY
128 x 512
RECALL
POWER
CONTROL
SOFTWARE
DETECT
A
0
- A
12
V
CC
W
NC
A
8
A
9
A
11
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
600 mil
Dual
In-Line
Module
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
RTC
PIN NAMES
A
0
- A
12
W
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
A
0
A
1
A
2
A
3
A
4
A
10
MUX
A
0
-
A
12
G
E
W
DQ
0
- DQ
7
E
G
V
CC
V
SS
March 1999
7-1

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