Atmel AT27C040
4Mb (512K x 8) OTP, EPROM
DATASHEET
Features
Fast read access time – 70ns
Low-power CMOS operation
100μA max standby
30mA max active at 5MHz
JEDEC standard packages
32-lead PDIP
32-lead PLCC
5V 10% supply
High-reliability CMOS technology
2000V ESD protection
200mA latchup immunity
Rapid programming algorithm – 100μs/byte (typical)
CMOS- and TTL-compatible inputs and outputs
Industrial temperature range
Green (Pb/halide-free) packaging option
1.
Description
The Atmel
®
AT27C040 is a low-power, high-performance, 4,194,304-bit, One-Time
Programmable, Read-Only Memory (OTP EPROM) organized as 512K by 8 bits. The
AT27C040 requires only one 5V power supply in normal Read mode operation. Any
byte can be accessed in less than 70ns, eliminating the need for speed reducing wait
states on high-performance microprocessor systems.
The Atmel scaled CMOS technology provides low active power consumption and fast
programming. Power consumption is typically 8mA in active mode and less than 10μA
in standby mode.
The AT27C040 is available in a choice of industry standard, JEDEC-approved, PDIP
and PLCC packages. The device features two-line control (CE, OE) to eliminate bus
contention in high-speed systems.
The AT27C040 has additional features to ensure high quality and efficient production
use. The rapid programming algorithm reduces the time required to program the part
and guarantees reliable programming. Programming time is typically only 100μs/byte.
The integrated product identification code electronically identifies the device and
manufacturer. This feature is used by industry standard programming equipment to
select the proper programming algorithms and voltages.
0189J–EPROM–10/2012
2.
Pin Configurations and Pinouts
Pin
Name
V
PP
A
0
- A
18
O
0
- O
7
GND
CE
OE
V
CC
Function
Peak to Peak Voltage
Address Inputs
4
3
2
1
32
31
32-lead PLCC
Top view
32-lead PDIP
Top view
A
12
A
15
A
16
V
PP
V
CC
A
18
A
17
Outputs
Ground
Chip Enable
Output Enable
Device Power Supply
14
15
16
17
18
19
20
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A
14
A
13
A
8
A
9
A
11
OE
A
10
CE
O
7
V
PP
A
16
A
15
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A
18
A
17
A
14
A
13
A
8
A
9
A
11
OE
A
10
CE
O
7
O
6
O
5
O
4
O
3
3.
Switching Considerations
Switching between active and standby conditions via the Chip Enable (CE) pin may produce transient voltage
excursions. Unless accommodated by the system design, these transients may exceed datasheet limits, resulting in
device nonconformance. At a minimum, a 0.1μF, high-frequency, low inherent inductance, ceramic capacitor should be
utilized for each device. This capacitor should be connected between the V
CC
and ground terminals of the device — as
close to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit boards with large
EPROM arrays, a 4.7μF bulk electrolytic capacitor should be utilized, again connected between the V
CC
and ground
terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to
the array.
4.
Block Diagram
V
CC
GND
V
PP
OE
CE
A
0
– A
18
Address
Inputs
OE, CE, and
Program Logic
Y Decoder
Data Outputs
O
0
– O
7
X Decoder
Identification
O
1
O
2
GND
O
3
O
4
O
5
O
6
Output
Buffers
Y-Gating
Cell Matrix
30
Atmel AT27C040 [DATASHEET]
0189J–EPROM–10/2012
2
5.
Absolute maximum ratings*
Temperature under bias-55°C to +125°C
Storage temperature . . . . . . . . . . . . . -65°C to +150°C
Voltage on any pin with
respect to ground. . . . . . . . . . . . . . . . . .-2.0V to +7.0V
Voltage on A
9
with
respect to ground . . . . . . . . . . . . . . . .-2.0V to +14.0V
V
PP
supply voltage with
respect to ground. . . . . . . . . . . . . . . . .-2.0V to +14.0V
*Notice: Stresses beyond those listed under “Absolute
maximum ratings” may cause permanent damage
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.
6.
6.1
Elelectrical Characteristics
DC and AC characteristics
Table 6-1.
Mode/Pin
Read
Output Disable
Standby
Rapid Program
(2)
PGM Verify
PGM Inhibit
Product Identification
(4)
Operating modes
CE
V
IL
X
V
IH
V
IL
X
V
IH
V
IL
OE
V
IL
V
IH
X
V
IH
V
IL
V
IH
V
IL
Ai
Ai
X
X
Ai
Ai
X
A
9
= V
H(3)
A
0
= V
IH
or V
IL
A
1
– A
18
= V
IL
V
PP
X
(1)
X
X
V
PP
V
PP
V
PP
X
Outputs
D
OUT
High Z
High Z
D
IN
D
OUT
High Z
Identification Code
Notes: 1.
2.
3.
4.
X can be V
IL
or V
IH
.
Refer to programming characteristics.
V
H
= 12.0 ± 0.5V.
Two identifier bytes may be selected. All Ai inputs are held low (V
IL
), except A
9
, which is set to V
H
, and A
0
,
which is toggled low (V
IL
) to select the manufacturer’s identification byte and high (V
IH
) to select the device
code byte.
Atmel AT27C040 [DATASHEET]
0189J–EPROM–10/2012
3
6.2
DC and AC Operating Conditions for Read Operation
Atmel AT27C040-70
Industrial Operating Temperature (Case)
V
CC
Power Supply
-40°C to 85°C
5V
10%
Atmel AT27C040-90
-40°C to 85°C
5V
10%
6.3
DC and Operating Characteristics for Read Operation
Symbol
I
LI
I
LO
I
PP1(2)
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Parameter
Input Load Current
Output Leakage Current
V
PP(1)
Read/Standby Current
V
CC1(1)
Standby Current
V
CC
Active Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
I
OL
= 2.1mA
I
OH
= -400μA
2.4
Condition
V
IN
= 0V to V
CC
V
OUT
= 0V to V
CC
V
PP
= V
CC
I
SB1
(CMOS), CE = V
CC
0.3V
I
SB2
(TTL), CE = 2.0 to V
CC
+ 0.5V
f = 5MHz, I
OUT
= 0mA, CE = V
IL
-0.6
2.0
Min
Max
1
5
10
100
1
30
0.8
V
CC
+ 0.5
0.4
Units
μA
μA
μA
μA
mA
mA
V
V
V
V
Notes: 1.
2.
V
CC
must be applied simultaneously with or before V
PP
, and removed simultaneously with or after V
PP
.
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
.
6.4
AC Characteristics for Read Operation
Atmel AT27C040
-70
Symbol
t
ACC(1)
t
CE(1)
t
OE(1)
t
DF(1)
t
OH
Parameter
Address to Output Delay
CE to Output Delay
OE to Output Delay
Condition
CE = OE
= V
IL
OE = V
IL
CE = V
IL
Min
Max
70
70
30
20
0
0
Min
-90
Max
90
90
35
20
Units
ns
ns
ns
ns
ns
OE or CE High to Output Float; whichever occurred first.
Output Hold from Address, CE or OE; whichever occurred
first.
Note:
1.
See AC waveforms for read operation.
Atmel AT27C040 [DATASHEET]
0189J–EPROM–10/2012
4
Figure 6-1. AC Waveforms for Read Operation
(1)
Address
Address Valid
CE
t
CE
t
OE
OE
t
DF
t
ACC
High Z
Output
Valid
t
OH
Output
Notes: 1.
2.
3.
4.
5.
Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless
otherwise specified.
OE may be delayed up to t
CE
– t
OE
after the falling edge of CE without impact on t
CE
.
OE may be delayed up to t
ACC
– t
OE
after the address is valid without impact on t
ACC
.
This parameter is only sampled, and is not 100% tested.
Output float is defined as the point when data is no longer driven.
Figure 6-2. Input Test Waveforms and Measurement Levels
2.40V
2.00
AC
Driving
Levels
0.45V
0.80
AC
Measurement
Level
Figure 6-3. Output Test Load
1.3V
(1N914)
3.3K
OUTPUT
PIN
CL
Table 6-2.
Pin Capacitance
f = 1MHz, T = 25
°
C
(1)
Symbol
C
IN
C
OUT
Typ
4
8
Max
8
12
Units
pF
pF
Conditions
V
IN
= 0V
V
OUT
= 0V
Note:
1.
Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
Atmel AT27C040 [DATASHEET]
0189J–EPROM–10/2012
5
京公网安备 11010802033920号
EEWORLD
