Features
•
Fast Read Access Time – 45 ns
•
Low-Power CMOS Operation
– 100 µA Max Standby
– 30 mA Max Active at 5 MHz
JEDEC Standard Packages
– 40-lead PDIP
– 44-lead PLCC
– 40-lead VSOP
Direct Upgrade from 512K (AT27C516) EPROM
5V ± 10% Power Supply
High-Reliability CMOS Technology
– 2000V ESD Protection
– 200 mA Latchup Immunity
Rapid Programming Algorithm – 100 µs/Word (Typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Industrial and Automotive Temperature Ranges
Green (Pb/Halide-free) Packaging Option
•
•
•
•
1-Megabit
(64K x 16)
OTP EPROM
AT27C1024
•
•
•
•
•
1. Description
The AT27C1024 is a low-power, high-performance 1,048,576 bit one-time program-
mable read-only memory (OTP EPROM) organized 64K by 16 bits. It requires only
one 5V power supply in normal read mode operation. Any word can be accessed in
less than 45 ns, eliminating the need for speed reducing WAIT states. The by-16 orga-
nization make this part ideal for high-performance 16- and 32-bit microprocessor
systems.
In read mode, the AT27C1024 typically consumes 15 mA. Standby mode supply cur-
rent is typically less than 10 µA.
The AT27C1024 is available in industry-standard JEDEC-approved one-time pro-
grammable (OTP) plastic PDIP, PLCC, and VSOP packages. The device features
two-line control (CE, OE) to eliminate bus contention in high-speed systems.
With high density 64K word storage capability, the AT27C1024 allows firmware to be
stored reliably and to be accessed by the system without the delays of mass storage
media.
Atmel’s AT27C1024 have additional features to ensure high quality and efficient pro-
duction use. The Rapid Programming Algorithm reduces the time required to program
the part and guarantees reliable programming. Programming time is typically only
100 µs/word. 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.
0019M–EPROM–12/07
2. Pin Configurations
Pin Name
A0 - A15
O0 - O15
CE
OE
PGM
NC
Note:
Both GND pins must be connected.
Function
Addresses
Outputs
Chip Enable
Output Enable
Program Strobe
No Connect
2.1
40-lead PDIP Top View
VPP
CE
O15
O14
O13
O12
O11
O10
O9
O8
GND
O7
O6
O5
O4
O3
O2
O1
O0
OE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VCC
PGM
NC
A15
A14
A13
A12
A11
A10
A9
GND
A8
A7
A6
A5
A4
A3
A2
A1
A0
2.3
44-lead PLCC Top View
O13
O14
O15
CE
VPP
NC
VCC
PGM
NC
A15
A14
2.2
40-lead VSOP Top View – Type 1
A9
A10
A11
A12
A13
A14
A15
NC
PGM
VCC
VPP
CE
O15
O14
O13
O12
O11
O10
O9
O8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GND
A8
A7
A6
A5
A4
A3
A2
A1
A0
OE
O0
O1
A2
O3
O4
O5
O6
O7
GND
2
AT27C1024
0019M–EPROM–12/07
O3
O2
O1
O0
OE
NC
A0
A1
A2
A3
A4
18
19
20
21
22
23
24
25
26
27
28
O12
O11
O10
O9
O8
GND
NC
O7
O6
O5
O4
7
8
9
10
11
12
13
14
15
16
17
6
5
4
3
2
1
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
A13
A12
A11
A10
A9
GND
NC
A8
A7
A6
A5
AT27C1024
3. System Considerations
Switching between active and standby conditions via the Chip Enable pin may produce tran-
sient voltage excursions. Unless accommodated by the system design, these transients may
exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF 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 4.7 µF 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
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
(1)
Voltage on A9 with
Respect to Ground .....................................-2.0V to + 14.0V
(1)
V
PP
Supply Voltage with
Respect to Ground ......................................-2.0V to + 14.0V
(1)
Note:
1. Minimum voltage is -0.6V DC which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is
V
CC
+ 0.75V DC which may overshoot to +7.0V for pulses of less than 20 ns.
*NOTICE:
Stresses beyond those listed under “Absolute Maxi-
mum 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 condi-
tions beyond those indicated in the operational sec-
tions of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect device reliability.
3
0019M–EPROM–12/07
6. Operating Modes
Mode/Pin
Read
Output Disable
Standby
Rapid Program
(2)
PGM Verify
PGM Inhibit
Product Identification
(4)
Notes:
1. X can be V
IL
or V
IH
.
2. Refer to Programming Characteristics.
3. V
H
= 12.0 ± 0.5V.
4. Two identifier words may be selected. All Ai inputs are held low (V
IL
), except A9 which is set to V
H
and A0 which is toggled
low (V
IL
) to select the Manufacturer’s Identification word and high (V
IH
) to select the Device Code word.
5. Standby V
CC
current (I
SB
) is specified with V
PP
= V
CC
. V
CC
> V
PP
will cause a slight increase in I
SB
.
CE
V
IL
X
V
IH
V
IL
V
IL
V
IH
V
IL
OE
V
IL
V
IH
X
V
IH
V
IL
X
V
IL
PGM
X
(1)
X
X
V
IL
V
IH
X
X
Ai
Ai
X
X
Ai
Ai
X
A9 = V
H(3)
A0 = V
IH
or V
IL
A1 - A15 = V
IL
V
PP
X
X
X
(5)
V
PP
V
PP
V
PP
V
CC
Outputs
D
OUT
High Z
High Z
D
IN
D
OUT
High Z
Identification Code
7. DC and AC Operating Conditions for Read Operation
AT27C1024
-45
Operating Temp. (Case)
V
CC
Power Supply
Ind.
Auto.
5V ± 10%
5V ± 10%
-40° C - 85° C
-70
-40° C - 85° C
8. DC and Operating Characteristics for Read Operation
Symbol
I
LI
Parameter
Input Load Current
Condition
Ind.
V
IN
= 0V to V
CC
Auto.
Ind.
I
LO
I
PP1(2)
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Notes:
Output Leakage Current
V
PP(1))
Read/Standby Current
V
CC(1)
Standby Current
V
CC
Active Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
I
OL
= 2.1 mA
I
OH
= -400 µA
2.4
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 = 5 MHz, I
OUT
= 0 mA, CE = V
IL
-0.6
2.0
Auto.
Min
Max
±1
±5
±5
±10
10
100
1
30
0.8
V
CC
+ 0.5
0.4
Units
µA
µA
µA
µA
µA
µA
mA
mA
V
V
V
V
1. V
CC
must be applied simultaneously or before V
PP
, and removed simultaneously 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
..
4
AT27C1024
0019M–EPROM–12/07
AT27C1024
9. AC Characteristics for Read Operation
AT27C1024
-45
Symbol
t
ACC(1)
t
CE(1)
t
OE(1)
t
DF(1)
t
OH
Note:
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
45
45
20
20
7
7
Min
-70
Max
70
70
25
25
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
1. See AC Waveforms for Read Operation.
10. AC Waveforms for Read Operation
(1)
Notes:
1. Timing measurement reference level is 1.5V for -45. Input AC drive levels are V
IL
= 0.0V and V
IH
= 3.0V. Timing measure-
ment reference levels for all other speed grades are V
OL
= 0.8V and V
OH
= 2.0V. Input AC drive levels are V
IL
= 0.45V and V
IH
= 2.4V.
2. OE may be delayed up to t
CE
- t
OE
after the falling edge of CE without impact on t
CE
.
3. OE may be delayed up to t
ACC
- t
OE
after the address is valid without impact on t
ACC
.
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer driven.
5
0019M–EPROM–12/07
