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參數資料
| 型號： | U634H256BSC35 |
| 英文描述： | NVRAM (EEPROM Based) |
| 中文描述： | NVRAM中（EEPROM的基礎） |
| 文件頁數： | 8/14頁 |
| 文件大小： | 239K |
| 代理商： | U634H256BSC35 |
8
December 12, 1997
U634H256
PowerStore and automatic Power Up RECALL
Hardware Controlled STORE
DQi
Output
Previous Data Valid
HSB
t
en(H)S
t
d(H)S
Data Valid
t
dis(H)S
p:
q:
r:
t
PDSTORE
approximate t
d(E)S
or t
d(H)S
; t
DELAY
approximate t
dis(H)S
.
After t
HSB is hold down internal by STORE operation.
An automatic RECALL also takes place at power up, starting when V
exceeds V
SWITCH
and takes t
RESTORE
. V
CC
must not drop below
V
SWITCH
once it has been exceeded for the RECALL to function properly.
s: Once the software controlled STORE or RECALL cycle is initiated, it completes automatically, ignoring all inputs.
t:
Noise on the E pin may trigger multiple READ cycles from the same address and abort the address sequence.
No.
Software Controlled STORE/
RECALL Cycle
Symbol
25
35
45
Unit
Alt.
IEC
Min. Max. Min. Max. Min. Max.
29
STORE/RECALL Initiation Time
t
AVAV
t
cR
25
35
45
ns
30
Chip Enable to Output Inactive
s
t
ELQZ
t
dis(E)SR
600
600
600
ns
31
STORE Cycle Time
t
ELQXS
t
d(E)S
10
10
10
ms
32
RECALL Cycle Time
r
t
ELQXR
t
d(E)R
20
20
20
μ
s
33
Address Setup to Chip Enable
t
t
AVELN
t
su(A)SR
0
0
0
ns
34
Chip Enable Pulse Width
s, t
t
ELEHN
t
w(E)SR
20
25
30
ns
35
Chip Disable to Address Change
t
t
EHAXN
t
h(A)SR
0
0
0
ns
t
w(H)Sq
28
26
27
25
High Impedance
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
V
CAP
5.0 V
V
SWITCH
t
PowerStore
Power Up
RECALL
W
DQi
POWER UP
RECALL
BROWN OUT
NO STORE
t
RESTOR
E
t
RESTORE
BROWN OUT
PowerStore
(NO SRAM WRITES)
24
24
t
PDSTOREp
t
DELAYp
相關PDF資料 |
PDF描述 |
|---|---|
| U634H256BSC45 | NVRAM (EEPROM Based) |
| U634H256BSK25 | NVRAM (EEPROM Based) |
| U634H256BSK35 | NVRAM (EEPROM Based) |
| U634H256BSK45 | NVRAM (EEPROM Based) |
| U634H256CD1C25 | NVRAM (EEPROM Based) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| U634H256BSC45 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (EEPROM Based) |
| U634H256BSK25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (EEPROM Based) |
| U634H256BSK35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (EEPROM Based) |
| U634H256BSK45 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (EEPROM Based) |
| U634H256CD1C25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (EEPROM Based) |
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