27C256-25/L MICROCHIP [Microchip Technology], 27C256-25/L Datasheet - Page 5

• Manufacturer Part Number: 27C256-25/L
• Description: 256K (32K x 8) Low-Voltage CMOS EPROM
• Manufacturer: MICROCHIP [Microchip Technology]

1.2
(See Timing Diagrams and AC Characteristics)
Read Mode is accessed when:
a)
b)
FIGURE 1-2:
TABLE 1-6:
Read
Program
Program Verify
Program Inhibit
Standby
Output Disable
Identity
X = Don’t Care
2004 Microchip Technology Inc.
Address
the CE pin is low to power up (enable) the chip
the OE pin is low to gate the data to the output
pins
Operation Mode
Data
V
V
CE
OE
Notes:
CC
PP
Read Mode
V
V
V
V
13.0V(2)
5.0V
6.5V(2)
5.0V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
PROGRAMMING WAVEFORMS
MODES
(1)
(2)
t
V
DF
CC
and t
= 6.5V ±0.25V, V
OE
t
t
are characteristics of the device but must be accommodated by the programmer
t
CE
V
V
V
V
V
V
V
t
VPS
VCS
AS
DS
IH
IH
IH
IL
IL
IL
IL
Data Stable
Address Stable
PP
t
t
PW
OPW
= V
Program
OE
V
V
V
V
V
V
X
IH
IH
IH
IL
IL
IL
H
= 13.0V ±0.25V for express algorithm
t
DH
For Read operations, if the addresses are stable, the
address access time (t
CE to output (t
after a delay from the falling edge of OE (t
V
V
V
V
V
t
V
V
V
OES
CC
CC
CC
CC
PP
H
H
H
High Z
t
(1)
OE
A9
CE
V
X
X
X
X
X
X
H
).
Data is transferred to the output
ACC
Verify
Data Out Valid
) is equal to the delay from
27LV256
Identity Code
O0 - O7
High Z
High Z
High Z
D
D
DS11020H-page 5
D
OUT
OUT
IN
t
(1)
t
DF
AH
OE
).