w27c520 Winbond Electronics Corp America, w27c520 Datasheet - Page 3

• Manufacturer Part Number: w27c520
• Description: 64k X 8 Electrically Erasable Eprom
• Manufacturer: Winbond Electronics Corp America

System Considerations
An EPROM's power switching characteristics require careful device decoupling. System designers are
interested in three supply current issues: standby current levels (I
transient current peaks produced by the falling and rising edges of ALE Transient current magnitudes
depend on the device output's capacitive and inductive loading. Proper decoupling capacitor selection
will suppress transient voltage peaks. Each device should have a
0.1 F ceramic capacitor connected between its V
inductance capacitor should be placed as close as possible to the device. Additionally, for every eight
devices, a 4.7
between V
inductances.
TABLE OF OPERATING MODES
(V
Address Latch Enable
Read
Output Disable
Standby
Program
Erase 1
Erase 2
Product Identifier-
manufacturer
Product Identifier-device
PP
= 13V, V
MODE
DD
PE
= 13V, V
and GND. The bulk capacitor will overcome voltage slumps caused by PC board trace
F electrolytic capacitor should be placed at the array's power supply connection
HH
= 12V, V
ALE
V
V
V
V
V
V
V
V
V
V
DP
IH
IL/
IH
IH
IH
IH
IH
IL
IL
IL
= 6.5V, V
OE /V
V
V
V
V
V
V
DE
V
V
V
IH
IH
IH
IL
IL
IL
PP
PE
PE
= 6.5V, V
PP
A8 = V
A8 = V
- 3 -
DD
A8&A11 = V
DD
= 3.3V or 5.0V, V
A10 = V
OTHER ADDRESS
Addr. = 2AAA (hex)
Second command:
Addr. = 5555 (hex)
IH
IL
and GND. This high frequency, low inherent-
First command:
, A9 = V
, A9 = V
IH
A
A
A
PIN
Preliminary W27C520
X
X
IN
IN
IN
IL
, Others = X
HH
HH
, A9 = V
Publication Release Date: October 2000
DI
SB
, Others = X
, Others = X
= 5.0V, X = V
), active current levels (I
PE
,
IH
or V
V
V
V
V
V
V
V
V
V
IL
V
V
)
DD
DD
DD
DD
DD
DP
DE
DE
DE
DI
DI
A[7:0]
D
High Z
A[7:0]
D
X
AA(hex)
10(hex)
DA(Hex)
1F(Hex)
Revision A1
AD[7:0]
OUT
IN
DD
), and