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 600-mil PDIP
– 44-Lead PLCC
– 40-Lead VSOP (10 mm x 14 mm)
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
Commercial, Industrial and Automotive Temperature Ranges
AT27C1024
•
•
•
•
•
•
•
1-Megabit
(64K x 16)
OTP EPROM
AT27C1024
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-
(continued)
Pin Configurations
Pin Name
A0 - A15
O0 - O15
CE
OE
PGM
NC
Note:
Function
Addresses
Outputs
Chip Enable
Output Enable
Program Strobe
No Connect
Both GND pins must be connected.
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
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
PLCC Top View
O13
O14
O15
CE
VPP
NC
VCC
PGM
NC
A15
A14
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
O3
O2
O1
O0
OE
NC
A0
A1
A2
A3
A4
18
19
20
21
22
23
24
25
26
27
28
Rev. 0019J–07/98
1
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 current is typically less than 10 µA.
The AT27C1024 is available in industry standard JEDEC-
approved one-time programmable (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 27C1024 have additional features to ensure high
quality and efficient production use. The Rapid
™
Program-
ming 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.
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may produce transient voltage excursions.
Unless accommodated by the system design, these tran-
sients may exceed data sheet limits, resulting in device
non-conformance. At a minimum, a 0.1 µF high frequency,
low inherent inductance, ceramic capacitor should be uti-
lized 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.
Block Diagram
2
AT27C1024
AT27C1024
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.
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
3
DC and AC Operating Conditions for Read Operation
AT27C1024
-45
Com.
Operating
Temp. (Case)
V
CC
Power Supply
Ind.
Auto.
5V
±
10%
5V
±
10%
5V
±
10%
0°C - 70°C
-40°C - 85°C
-55
0°C - 70°C
-40°C - 85°C
-70
0°C - 70°C
-40°C - 85°C
-90
0°C - 70°C
-40°C - 85°C
-40°C - 125°C
5V
±
10%
-12
0°C - 70°C
-40°C - 85°C
-40°C - 125°C
5V
±
10%
-15
0°C - 70°C
-40°C - 85°C
-40°C - 125°C
5V
±
10%
DC and Operating Characteristics for Read Operation
Symbol
I
LI
Parameter
Input Load Current
Condition
Com., Ind.
V
IN
= 0V to V
CC
Auto.
Com., Ind.
I
LO
I
PP1(2)
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
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
Notes:
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
..
AC Characteristics for Read Operation
AT27C1024
-45
Symbol
t
ACC(3)
t
CE(2)
t
OE(2)(3)
t
DF(4)(5)
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
45
45
20
20
7
7
Min
-55
Max
55
55
25
25
7
Min
-70
Max
70
70
25
25
0
Min
-90
Max
90
90
30
30
0
Min
-12
Max
120
120
35
30
0
Min
-15
Max
150
150
50
40
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:
2, 3, 4, 5. - see AC Waveforms for Read Operation.
4
AT27C1024
AT27C1024
AC Waveforms for Read Operation
(1)
Notes:
1.
Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are V
IL
= 0.0V and V
IH
= 3.0V.
Timing measurement 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.
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.
2.
3.
4.
5.
Pin Capacitance
f = 1 MHz, T = 25°C
(1)
Symbol
C
IN
C
OUT
Note:
Typ
4
8
Max
10
12
Units
pF
pF
Conditions
V
IN
= 0V
V
OUT
= 0V
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
Input Test Waveforms and Measurement Levels
Output Test Load
For -45 and -55
Devices Only
For -70 and slower
Devices Only
Note:
C
L
= 100 pF including jig
capacitance except -45 and -55
devices, where C
L
= 30 pF.
5
