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AT29C256-90PI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
4
AT29C256
0046O–FLASH–06/02
PRODUCT IDENTIFICATION: The product identification mode identifies the device
and manufacturer and may be accessed by a hardware operation. For details, see
Operating Modes or Product Identification.
DATA POLLING: The AT29C256 features DATA
polling to indicate the end of a pro-
gram cycle. During a program cycle an attempted read of the last byte loaded will result
in the complement of the loaded data on I/O7. Once the program cycle has been com-
pleted, true data is valid on all outputs and the next cycle may begin. DATA
polling may
begin at any time during the program cycle.
TOGGLE BIT: In addition to DATA
polling the AT29C256 provides another method for
determining the end of a program or erase cycle. During a program or erase operation,
successive attempts to read data from the device will result in I/O6 toggling between
one and zero. Once the program cycle has completed, I/O6 will stop toggling and valid
data will be read. Examining the toggle bit may begin at any time during a program
cycle.
OPTIONAL CHIP ERASE MODE: The entire device can be erased by using a six-byte
software code. Please see Software Chip Erase application note for details.
Absolute Maximum Ratings*
Temperature Under Bias................................ -55°Cto+125°C
*NOTICE: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability.
Storage Temperature ..................................... -65°Cto+150°C
All Input Voltages (including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to V
CC
+0.6V
Voltage on OE
with Respect to Ground ...................................-0.6V to +13.5V
5
AT29C256
0046O–FLASH–06/02
Notes: 1. X can be V
IL
or V
IH
.
2. Refer to AC Programming Waveforms.
3. V
H
= 12.0V ± 0.5V.
4. Manufacturer Code: 1F, Device Code: DC.
5. See details under Software Product Identification Entry/Exit.
DC and AC Operating Range
AT29C256-70 AT29C256-90 AT29C256-12 AT29C256-15
Operating
Temperature (Case)
Com. 0°C-70°C0°C-70°C0°C-70°C
0°C-70°C
Ind. -40°C-85°C-40°C-85°C-40°C-85°C
-40°C-85°C
V
CC
Power Supply 5V ± 5% 5V± 10% 5V± 10% 5V± 10%
Note:
Not recommended for New Designs.
Operating Modes
Mode CE OE WE Ai I/O
Read V
IL
V
IL
V
IH
Ai D
OUT
Program
(2)
V
IL
V
IH
V
IL
Ai D
IN
5V Chip Erase V
IL
V
IH
V
IL
Ai
Standby/Write Inhibit V
IH
X
(1)
XXHighZ
Write Inhibit X X V
IH
Write Inhibit X V
IL
X
Output Disable X V
IH
XHighZ
High Voltage Chip Erase V
IL
V
H
(3)
V
IL
XHighZ
Product Identification
Hardware
V
IL
V
IL
V
IH
A1-A14 = V
IL
,A9=V
H
,A0=V
IL
Manufacturer Code
(4)
A1-A14 = V
IL
,A9=V
H
,A0=V
IH
Device Code
(4)
Software
(5)
A0 = V
IL
Manufacturer Code
(4)
A0 = V
IH
Device Code
(4)
DC Characteristics
Symbol Parameter Condition Min Max Units
I
LI
Input Load Current V
IN
=0VtoV
CC
10 µA
I
LO
Output Leakage Current V
I/O
=0VtoV
CC
10 µA
I
SB1
V
CC
Standby Current CMOS CE =V
CC
-0.3VtoV
CC
300 µA
I
SB2
V
CC
Standby Current TTL CE =2.0VtoV
CC
3mA
I
CC
V
CC
Active Current f = 5 MHz; I
OUT
= 0 mA 50 mA
V
IL
Input Low Voltage 0.8 V
V
IH
Input High Voltage 2.0 V
V
OL
Output Low Voltage I
OL
=2.1mA 0.45 V
V
OH1
Output High Voltage I
OH
=-400µA 2.4 V
V
OH2
Output High Voltage CMOS I
OH
=-100µA;V
CC
=4.5V 4.2 V
6
AT29C256
0046O–FLASH–06/02
AC Read Waveforms
(1)(2)(3)(4)
Notes: 1. CE may be delayed up to t
ACC
-t
CE
after the address transition without impact on t
ACC
.
2. OE
may be delayed up to t
CE
-t
OE
after the falling edge of CE without impact on t
CE
or by t
ACC
-t
OE
after an address change
without impact on t
ACC
.
3. t
DF
is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
AC Read Characteristics
Symbol Parameter
AT29C256-70 AT29C256-90 AT29C256-12
AT29C256-15
UnitsMin Max Min Max Min Max
Min Max
t
ACC
Address to Output Delay 70 90 120 150 ns
t
CE
(1)
CE to Output Delay 70 90 120 150 ns
t
OE
(2)
OE to Output Delay 0 40 0 40 0 50 0 70 ns
t
DF
(3)(4)
CE or OE to Output Float 0 25 0 25 0 30 0 40 ns
t
OH
Output Hold from OE,CEor Address,
whichever occurred first
0000 ns
Note:
Not recommended for New Designs.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

AT29C256-90PI

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Description:
IC FLASH 256K PARALLEL 28DIP
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