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STK1744-D45I Datasheet

  • STK1744-D45I

  • 32K x 8 AutoStore nvSRAM with Real-Time Clock

  • 12頁

  • ETC

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STK1744
nvTime鈩?/div>
32K x 8
AutoStore鈩?/div>
nvSRAM
with Real-Time Clock
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
鹵
10% Power Supply
DESCRIPTION
PRELIMINARY
The Simtek STK1744
DIP
module houses 256Kb 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 Nonvolatile
Elements at all times. Automatic
RECALL
on power
up transfers the Nonvolatile Elements data to the
SRAM
, while an automatic
STORE
on power down
transfers
SRAM
data to the Nonvolatile Elements. A
software
RECALL
and
STORE
are also possible on
user command.
nvTime鈩?/div>
allows unlimited
READ
and
WRITE
accesses to
SRAM
, unlimited
RECALL
s
and 10
6
STORE
s.
BLOCK DIAGRAM
QUANTUM TRAP
512 x 512
V
CC
STORE/
RECALL
CONTROL
PIN CONFIGURATIONS
A
14
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
A
13
A
14
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
ROW DECODER
STORE
STATIC RAM
ARRAY
512 x 512
RECALL
POWER
CONTROL
SOFTWARE
DETECT
A
0
- A
13
V
CC
W
A
13
A
8
A
9
A
11
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
28 - 600 DIP
Module
(See application
note for surface
mount)
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
RTC
PIN NAMES
A
0
- A
14
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
14
G
E
W
DQ
0
- DQ
7
E
G
V
CC
V
SS
January 2003
1
Document Control # ML0020 rev 0.0

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