ATMEL AT27C020 User Manual
BDTIC www.BDTIC.com/ATMEL
Features
• Fast Read Access Time – 55 ns
• Low-power CMOS Operation
– 100 µA Max Standby
– 25 mA Max Active at 5 MHz
• JEDEC Standard Packages
– 32-lead PDIP
– 32-lead PLCC
– 32-lead TSOP
• 5V ± 10% Supply
• High-reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latch-up Immunity
• Rapid
• CMOS- and TTL-compatible Inputs and Outputs
• Integrated Product Identification Code
• Industrial and Automotive Temperature Ranges
• Green (Pb/Halide-free) Packaging Option
Programming Algorithm – 100 µs/Byte (Typical)
2-megabit
(256K x 8)
OTP EPROM
AT27C020
1. Description
The AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time programmable read-only memory (OTP EPROM) organized as 256K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed
in less than 55 ns, eliminating the need for speed-reducing WAIT states on highperformance microprocessor systems.
In read mode, the AT27C020 typically consumes 8 mA. Standby mode supply current
is typically less than 10 µA.
The AT27C020 is available in a choice of industry-standard JEDEC-approved onetime programmable (OTP) plastic PDIP, PLCC and TSOP packages. All devices feature two-line control (CE
contention.
With 256K bytes storage capability, the AT27C020 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s AT27C020 has additional features to ensure high quality and efficient production use. The Rapid
part and guarantees reliable programming. Programming time is typically only
100 µs/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.
Programming Algorithm reduces the time required to program the
, OE) to give designers the flexibility to prevent bus
0570G–EPROM–12/07
2. Pin Configurations
Pin Name Function
A0 - A17 Addresses
O0 - O7 Outputs
CE
OE
PGM
2.1 32-lead PLCC Top View
A12
A15
A16
VPP
VCC
PGM
A7
A6
A5
A4
A3
A2
A1
A0
O0
432
5
6
7
8
9
10
11
12
13
14151617181920
01
02
1
030405
GND
323130
A17
29
28
27
26
25
24
23
22
21
06
A14
A13
A8
A9
A11
OE
A10
CE
07
Chip Enable
Output Enable
Program Strobe
2.3 32-lead TSOP (Type 1) Top View
A11
A9
A8
A13
A14
A17
PGM
VCC
VPP
A16
A15
A12
A7
A6
A5
A4
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
OE
A10
CE
07
06
05
04
03
GND
02
01
O0
A0
A1
A2
A3
2.2 32-lead PDIP Top View
1
VPP
2
A16
3
A15
4
A12
5
A7
6
A6
7
A5
8
A4
9
A3
10
A2
11
A1
12
A0
13
O0
14
O1
15
O2
16
GND
2
AT27C020
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
PGM
A17
A14
A13
A8
A9
A11
OE
A10
CE
07
06
05
04
03
0570G–EPROM–12/07
3. 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 transients may
exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF highfrequency, low inherent inductance, ceramic capacitor should be utilized for each device. This
capacitor should be connected between the V
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
close as possible to the point where the power supply is connected to the array.
4. Block Diagram
AT27C020
and Ground terminals of the device, as close
CC
and Ground terminals. This capacitor should be positioned as
CC
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 A9 with
Respect to Ground ......................................-2.0V to +14.0V
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V
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
+ 0.75V DC, which may overshoot to +7.0V for pulses of less than 20 ns.
V
CC
(1)
(1)
(1)
*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.
0570G–EPROM–12/07
3
6. Operating Modes
Mode/Pin CE OE PGM Ai V
Read V
IL
Output Disable X V
Standby V
Rapid Program
(2)
PGM Verify V
PGM Inhibit V
Product Identification
(4)
IH
V
IL
IL
IH
V
IL
V
IL
IH
X X X X High-Z
V
IH
V
IL
XX X V
V
IL
(1)
X
Ai X D
X X X High-Z
V
IL
V
IH
X
Ai V
Ai V
A9 = V
(3)
H
A0 = VIH or V
A1 - A17 = V
IL
IL
Notes: 1. X can be VIL or VIH.
2. Refer to Programming Characteristics.
3. V
= 12.0 ± 0.5V.
H
4. Two identifier bytes may be selected. All Ai inputs are held low (V
low (V
) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.
IL
) except A9, which is set to VH and A0, which is toggled
IL
7. DC and AC Operating Conditions for Read Operation
-55 -90
PP
PP
PP
PP
Outputs
OUT
D
IN
D
OUT
High-Z
X Identification Code
AT27C020
Operating Temperature (Case)
Ind. -40° C - 85° C-40° C - 85° C
Auto. -40° C - 125° C
Power Supply 5V ± 10% 5V ± 10%
V
CC
8. DC and Operating Characteristics for Read Operation
Symbol Parameter Condition Min Max Units
I
LI
I
LO
(2)
I
PP
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Notes: 1. V
2. V
Input Load Current VIN = 0V to V
Output Leakage Current V
(1)
V
Read/Standby Current V
PP
(1)
V
Standby Current
CC
= 0V to V
OUT
= V
PP
CC
I
(CMOS), CE = VCC ± 0.3V 100 µA
SB1
(TTL), CE = 2.0 to V
I
SB2
VCC Active Current f = 5 MHz, I
Input Low Voltage -0.6 0.8 V
Input High Voltage 2.0 VCC + 0.5 V
Output Low Voltage I
= 2.1 mA 0.4 V
OL
Output High Voltage IOH = -400 µA 2.4 V
must be applied simultaneously or before V
CC
may be connected directly to VCC except during programming. The supply current would then be the sum of I
PP
(Com., Ind.) ±1.0 µA
CC
(Com., Ind.) ±5.0 µA
CC
±10 µA
+ 0.5V 1.0 mA
CC
= 0 mA, CE = V
OUT
, and removed simultaneously or after V
PP
IL
PP
.
25 mA
CC
and I
PP
.
4
AT27C020
0570G–EPROM–12/07
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