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PDF STK1743 Data sheet ( Hoja de datos )
| Número de pieza | STK1743 | |
| Descripción | NV TIME 8K X 8 AUTOSTORE NVSRAM | |
| Fabricantes | Simtek | |
| Logotipo |  |
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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
ADVANCE
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
STOREs.
BLOCK DIAGRAM
EEPROM ARRAY
128 x 512
A5
A6 STORE
A7 STATIC RAM
A8
ARRAY
RECALL
A9 128 x 512
A11
A12
VCC
STORE/
RECALL
CONTROL
POWER
CONTROL
SOFTWARE
DETECT
A0 - A12
PIN CONFIGURATIONS
NC
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 W
26 NC
25 A8
24 A9
23 A11
22 G
21 A10
20 E
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
600 mil
Dual
In-Line
Module
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
RTC
MUX
A0 -
A12
PIN NAMES
A0 - A12
W
Address Inputs
Write Enable
DQ0 - DQ7
Data In/Out
E
GG
Chip Enable
Output Enable
E
VCC
Power (+ 5V)
W VSS Ground
March 1999
7-1
1 page  
AutoStore™ / POWER-UP RECALL
SYMBOLS
NO.
Standard
PARAMETER
22 tRESTORE
23 tSTORE
24 tDELAY
25 VSWITCH
26 VRESET
Power-Up RECALL Duration
STORE Cycle Duration
Time Allowed to Complete SRAM Cycle
Low Voltage Trigger Level
Low Voltage Reset Level
Note k: tRESTORE starts from the time VCC rises above VSWITCH.
AutoStore™ / POWER-UP RECALL
VCC
5V
25
VSWITCH
26
VRESET
AutoStore™
POWER-UP RECALL
W
22
tRESTORE
DQ (DATA OUT)
24
tDELAY
STK1743
(VCC = 5.0V ± 10%)
STK1743
MIN MAX
UNITS NOTES
550 µs
10 ms
k
g
1 µs
4.0 4.5
V
g
3.9 V
23
tSTORE
POWER-UP
BROWN OUT
RECALL NO STORE DUE TO
NO SRAM WRITES
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
BROWN OUT
AutoStore™
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
BROWN OUT
AutoStore™
RECALL WHEN
VCC RETURNS
ABOVE VSWITCH
March 1999
7-5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet STK1743.PDF ] | |
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