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參數(shù)資料
| 型號： | STK14C88-3RF35 |
| 元件分類： | SRAM |
| 英文描述： | 32K X 8 NON-VOLATILE SRAM, 35 ns, PDSO48 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-48 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大小： | 371K |
| 代理商： | STK14C88-3RF35 |
STK14C88-3
November 2003
9
Document Control # ML0015 rev 0.3
SOFTWARE NONVOLATILE RECALL
A software RECALL cycle is initiated with a sequence
of READ operations in a manner similar to the soft-
ware STORE initiation. To initiate the RECALL cycle,
the following sequence of E controlled READ opera-
tions must be performed:
1. Read address
0E38 (hex)
Valid READ
2. Read address
31C7 (hex)
Valid READ
3. Read address
03E0 (hex)
Valid READ
4. Read address
3C1F (hex)
Valid READ
5. Read address
303F (hex)
Valid READ
6. Read address
0C63 (hex)
Initiate RECALL cycle
Internally, RECALL is a two-step procedure. First, the
SRAM
data is cleared, and second, the nonvolatile
information is transferred into the SRAM cells. After
the t
RECALL cycle time the SRAM will once again be
ready for READ and WRITE operations. The RECALL
operation in no way alters the data in the nonvolatile
elements. The nonvolatile data can be recalled an
unlimited number of times.
AutoStore OPERATION
During
normal
AutoStore
operation,
the
STK14C88-3 will draw current from V
CCX to charge a
capacitor connected to the V
CAP pin. This stored
charge will be used by the chip to perform a single
STORE
operation. After power up, when the voltage
on the V
CAP pin drops below VSWITCH, the part will
automatically disconnect the V
CAP pin from VCCX and
initiate a STORE operation.
Figure 2 shows the proper connection of capacitors
for automatic store operation. A charge storage
capacitor having a capacity of between 68
F and
220
F (± 20%) rated at 4.7V should be provided.
In order to prevent unneeded STORE operations,
automatic STOREs as well as those initiated by
externally driving HSB low, will be ignored unless at
least one WRITE operation has taken place since the
most recent STORE or RECALL cycle. Software-
initiated STORE cycles are performed regardless of
whether a WRITE operation has taken place. An
optional pull-up resistor is shown connected to HSB.
This can be used to signal the system that the
AutoStore cycle is in progress.
Figure 2: AutoStore Mode
*If HSB is not used, it should be left unconnected.
If the power supply drops faster than 20
s/volt
before V
CCX reaches VSWITCH, then a 1 ohm resistor
should be inserted between V
CCX and the system
supply to avoid a momentary excess of current
between Vccx and Vcap.
HSB OPERATION
The STK14C88-3 provides the HSB pin for control-
ling and acknowledging the STORE operations. The
HSB pin can be used to request a hardware STORE
cycle. When the HSB pin is driven low, the
STK14C88-3 will conditionally initiate a STORE oper-
ation after t
DELAY; an actual STORE cycle will only
begin if a WRITE to the SRAM took place since the
last STORE or RECALL cycle. The HSB pin also acts
as an open drain driver that is internally driven low
to indicate a busy condition while the STORE (initi-
ated by any means) is in progress.
SRAM READ
and WRITE operations that are in
progress when HSB is driven low by any means are
given time to complete before the STORE operation
is initiated. After HSB goes low, the STK14C88-3
will continue SRAM operations for t
DELAY. During tDELAY,
multiple SRAM READ operations may take place. If a
WRITE
is in progress when HSB is pulled low it will
be allowed a time, t
DELAY, to complete. However, any
SRAM WRITE
cycles requested after HSB goes low
will be inhibited until HSB returns high.
The HSB pin can be used to synchronize multiple
STK14C88-3s while using a single larger capacitor.
1
16
32
31
17
68
F
6
v,
±
20%
0.
1
F
By
pa
ss
30
+
10
k
10k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STK14C88-3WF35 | 功能描述:NVRAM 32Kbx8 3.0-3.6V AutoStore RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK14C88-3WF35I | 功能描述:NVRAM 32Kbx8 3.0-3.6V AutoStore RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK14C88-3WF35ITR | 制造商:Cypress Semiconductor 功能描述:STK14C88-3WF35ITR - Tape and Reel |
| STK14C88-3WF35TR | 制造商:Cypress Semiconductor 功能描述:STK14C88-3WF35TR - Tape and Reel |
| STK14C88-3WF45 | 功能描述:NVRAM 32Kbx8 3.0-3.6V AutoStore RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
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