w27e520 Winbond Electronics Corp America, w27e520 Datasheet - Page 3

• Manufacturer Part Number: w27e520
• 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
as close as possible to the device. Additionally, for every eight devices, a 4.7 F electrolytic capacitor
should be placed at the array's power supply connection between V
will overcome voltage slumps caused by PC board trace 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
PE
= 13V, V
DD
and GND. This high frequency, low inherent-inductance capacitor should be placed
HH
= 12V, V
ALE
/V
DP
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IL
IL
IL
IL
IH
= 6.5V, V
OE/V
DE
V
V
V
V
V
V
V
V
V
IH
IH
IH
IL
IL
IL
PP
PE
PE
= 6.5V, V
PP
A8 = V
A8 = V
DD
- 3 -
= 5.0V, V
A8&A11 = V
A10 = V
OTHER ADDRESS
Addr. = 2AAA (hex)
Second command:
Addr. = 5555 (hex)
IH
IL
First command:
, A9 = V
, A9 = V
DI
= 5.0V, X = V
IH
A
A
A
Publication Release Date: September 2000
PIN
X
X
IN
IN
IN
IL
, Others = X
HH
HH
, A9 = V
SB
, Others = X
, Others = X
), active current levels (I
DD
IH
and GND. The bulk capacitor
or V
PE
IL
,
)
V
V
V
V
V
V
V
V
V
V
V
DD
DD
DD
DD
DD
DP
DE
DE
DE
W27E520
DI
DI
A[7:0]
D
High Z
A[7:0]
D
X
AA(hex)
10(hex)
DA(Hex)
1F(Hex)
Revision A2
AD[7:0]
OUT
IN
DD
), and