Datasheet

4
0014O–EPROM–10/11
Atmel AT27C256R
Table 5-3. DC and operating characteristics for read operation
Notes: 1. V
CC
must be applied simultaneously with or before V
PP
, and removed simultaneously with or after V
PP
.
2. V
PP
may be connected directly to V
CC
, except during programming. The supply current would then be the sum of I
CC
and
I
PP
.
Table 5-4. AC characteristics for read operation
Note: 1. See AC waveforms for read operation.
Symbol Parameter Condition Min Max Units
I
LI
Input load current V
IN
= 0V to V
CC
Ind. ±1 µA
Auto. ±5 µA
I
LO
Output leakage current V
OUT
= 0V to V
CC
Ind. ±5 µA
Auto. ±10 µA
I
PP1
(2)
V
PP
(1)
read/standby current V
PP
= V
CC
10 µA
I
SB
V
CC
(1)
standby current
I
SB1
(CMOS), CE = V
CC
 0.3V 100 µA
I
SB2
(TTL), CE = 2.0 to V
CC
+ 0.5V 1 mA
I
CC
V
CC
active current f = 5MHz, I
OUT
= 0mA, E = V
IL
20 mA
V
IL
Input low voltage -0.6 0.8 V
V
IH
Input high voltage 2.0 V
CC
+ 0.5 V
V
OL
Output low voltage I
OL
= 2.1mA 0.4 V
V
OH
Output high voltage I
OH
= -400µA 2.4 V
Symbol Parameter Condition
Atmel AT27C256R
Units
-45 -70
Min Max Min Max
t
ACC
(1)
Address to output delay CE = OE = V
IL
45 70 ns
t
CE
(1)
CE to output delay OE = V
IL
45 70 ns
t
OE
(1)
OE to output delay CE = V
IL
20 30 ns
t
DF
(1)
OE or CE high to output float, whichever occurred first 20 25 ns
t
OH
Output hold from address, CE or OE, whichever occurred
first
77 ns