W27E512P-12 Winbond Electronics, W27E512P-12 Datasheet - Page 4

• Manufacturer Part Number: W27E512P-12
• Manufacturer: Winbond Electronics

Specifications of W27E512P-12

• Density: 512Kb
• Interface Type: Parallel
• Organization: 64Kx8
• Access Time (max): 120ns
• Write Protection: No
• Operating Supply Voltage (typ): 5V
• Package Type: PLCC
• Operating Temp Range: 0C to 70C
• Supply Current: 30mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

Standby Mode
The standby mode significantly reduces V
mode, all outputs are in a high impedance state, independent of #OE /V
Two-line Output Control
Since EPROMs are often used in large memory arrays, the W27E512 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
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 #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
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.
7. TABLE OF OPERATING MODES
(V
PP
Read
Output Disable
Standby (TTL)
Standby (CMOS)
Program
Program Verify
Program Inhibit
Erase
Erase Verify
Erase Inhibit
Product Identifier-manufacturer
Product Identifier-device
= 12V, V
DD
PE
= 14V, V
MODE
and V
F electrolytic capacitor should be placed at the array's power supply connection
HH
SS
= 12V, V
. The bulk capacitor will overcome voltage slumps caused by PC board trace
CP
= 5V, V
V
CE
DD
#CE
= 5V, X = V
V
V
V
V
V
V
V
V
V
V
V
DD
IH
IH
IH
IL
IL
IL
IL
IL
IL
IL
IL
0.3V
current. This mode is entered when #CE high. In standby
- 4 -
IH
DD
or V
#OE/V
and V
IL
V
V
V
V
V
V
V
V
V
V
)
X
IH
X
IL
IL
IL
IL
IL
PP
PP
PE
PE
PP
SS
. This high frequency, low inherent-
PINS
V
A0
V
V
SB
X
X
X
X
X
X
X
X
X
IH
IL
IL
), active current levels (I
PP
V
V
.
V
A9
X
X
X
X
X
X
X
X
X
HH
HH
PE
V
V
V
V
V
V
3.75
V
V
V
V
V
V
DD
DD
DD
DD
DD
DD
DD
CP
DD
CP
CE
CE
W27E512
D
High Z
High Z
High Z
D
D
High Z
D
D
High Z
DA (Hex)
08 (Hex)
OUTPUTS
OUT
IN
OUT
IH
OUT
CC
), and