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參數資料
| 型號： | W27C020 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 256K X 8 ELECTRICALLY ERASABLE EPROM |
| 中文描述： | 256K × 8電可擦除只讀存儲器 |
| 文件頁數： | 3/14頁 |
| 文件大小： | 160K |
| 代理商： | W27C020 |
Preliminary W27C020
Publication Release Date: September 1998
- 3 -
Revision A1
Standby Mode
The standby mode significantly reduces V
CC
current. This mode is entered when CE = V
IH
. In
standby mode, all outputs are in a high impedance state, independent of OE and PGM.
Two-line Output Control
Since EPROMs are often used in large memory arrays, the W27C020 provides two control inputs for
multiple memory connections. Two-line control provides for lowest possible memory power
dissipation and ensures that data bus contention will not occur.
System Considerations
EPROM power switching characteristics require careful device decoupling. System designers are
concerned with three supply current issues: standby current levels (I
SB
), active current levels (I
CC
),
and transient current peaks produced by the falling and rising edges of CE. Transient current
magnitudes depend on the device output's capacitive and inductive loading. Two-line control and
proper decoupling capacitor selection will suppress transient voltage peaks. Each device should have
a 0.1
μ
F ceramic capacitor connected between its V
CC
and GND. This high frequency, low inherent-
inductance capacitor should be placed as close as possible to the device. Additionally, for every eight
devices, a 4.7
μ
F electrolytic capacitor should be placed at the array's power supply connection
between V
CC
and GND. The bulk capacitor will overcome voltage slumps caused by PC board trace
inductances.
TABLE OF OPERATING MODES
V
PP
= 12V, V
PE
= 14V, V
HH
= 12V, V
CP
= 5V, V
CE
= 5V, V
ID
= 14V, X = V
IH
or V
IL
MODE
PINS
A0
CE
OE
PGM
A9
V
CC
V
PP
OUTPUTS
Read
Output Disable
Standby (TTL)
Standby (CMOS)
Program
Program Verify
Program Inhibit
Erase
Erase Verify
Erase Inhibit
Product Identifier-
manufacturer
Product Identifier-device
V
IL
V
IL
V
IH
V
IL
V
IH
X
X
V
IH
V
IL
X
V
IH
V
IL
X
V
IL
X
X
X
X
V
IL
V
IH
X
V
IL
V
IH
X
X
X
X
X
X
X
X
X
V
IL
X
X
V
IL
X
X
X
X
X
X
X
V
CC
V
CC
V
CC
V
CC
V
CP
V
CC
V
CP
V
CE
V
CC
V
CE
V
CC
V
CC
V
CC
V
CC
V
CC
V
PP
V
PP
V
PP
V
PE
V
PE
V
PE
V
CC
D
OUT
High Z
High Z
High Z
D
IN
D
OUT
High Z
FF (Hex)
D
OUT
High Z
DA (Hex)
V
CC
±
0.3V
V
IL
V
IL
V
IH
V
IL
V
IL
V
IH
V
IL
V
ID
X
X
V
HH
V
IL
V
IL
X
V
IH
V
HH
V
CC
V
CC
85 (Hex)
相關PDF資料 |
PDF描述 |
|---|---|
| W27C020-12 | 256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M-12 | 256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M-70 | 256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M-90 | 256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020P-12 | 256K X 8 ELECTRICALLY ERASABLE EPROM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W27C020-12 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020-90 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M-12 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256K X 8 ELECTRICALLY ERASABLE EPROM |
| W27C020M-70 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256K X 8 ELECTRICALLY ERASABLE EPROM |
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