Features
•Fast read access time – 55ns
•Low-power CMOS operation
– 100µA max standby
– 25mA max active at 5MHz
•JEDEC standard packages
– 32-lead PDIP
– 32-lead PLCC
•5V 10% supply
•High-reliability CMOS technology
– 2,000V ESD protection
– 200mA latchup immunity
•Rapid programming algorithm – 100µs/byte (typical)
•CMOS- and TTL-compatible inputs and outputs
•Integrated product identification code
•Industrial and automotive temperature ranges
•Green (Pb/halide-free) packaging option
1. Description
The Atmel® AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time pro-
grammable, 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
55ns, eliminating the need for speed-reducing WAIT states on high-performance micropro-
cessor systems.
In read mode, the AT27C020 typically consumes 8mA. Standby mode supply current is
typically less than 10µA.
The AT27C020 is available in a choice of industry-standard, JEDEC approved, one-time pro-
grammable (OTP) PDIP and PLCC packages. All devices feature two-line control (CE, OE)
to give designers the flexibility to prevent bus contention.
With 256K byte storage capability, the AT27C020 allows firmware to be stored reliably and
to be accessed by the system without the delays of mass storage media.
The AT27C020 has additional features to ensure high quality and efficient production use.
The rapid programming algorithm reduces the time required to program the part and guar-
antees 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 pro-
gramming algorithms and voltages.
2Mb (256K x 8)
One-time
Programmable,
Read-only Memory
Atmel AT27C020
0570H–EPROM–4/11
2
0570H–EPROM–4/11
Atmel AT27C020
2. Pin configurations
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 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 VCC 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 VCC and ground terminals. This capacitor should be positioned as
close as possible to the point where the power supply is connected to the array.
Figure 3-1. Block diagram
Pin name Function
A0 - A17 Addresses
O0 - O7 Outputs
CE Chip enable
OE Output enable
PGM Program strobe
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A7
A6
A5
A4
A3
A2
A1
A0
O0
A14
A13
A8
A9
A11
OE
A10
CE
07
4
3
2
1
32
31
30
14
15
16
17
18
19
20
01
02
GND
03
04
05
06
A12
A15
A16
VPP
VCC
PGM
A17
32-lead PLCC
Top view
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
VPP
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
VCC
PGM
A17
A14
A13
A8
A9
A11
OE
A10
CE
07
06
05
04
03
32-lead PDIP
Top view
3
0570H–EPROM–4/11
Atmel AT27C020
4. Absolute maximum ratings*
Note: 1. Minimum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20ns. Maximum output pin voltage is
VCC + 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns.
5. DC and AC characteristics
Table 5-1. Operating modes
Notes: 1. X can be VIL or VIH.
2. Refer to programming characteristics.
3. VH = 12.0 ± 0.5V.
4. Two identifier bytes may be selected. All Ai inputs are held low (VIL) except A9, which is set to VH, and A0, which is tog-
gled low (VIL) to select the manufacturer’s identification byte and high (VIH) to select the device code byte.
Table 5-2. DC and AC operating conditions for read operation
Temperature under bias . . . . . . . . . . . . . .-55°C to +125°C *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.
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)
VPP supply voltage with
respect to ground . . . . . . . . . . . . . . . . . . -2.0V to +14.0V(1)
Mode/Pin CE OE PGM Ai VPP Outputs
Read VIL VIL X(1) Ai X DOUT
Output disable X VIH X X X High-Z
Standby VIH X X X X High-Z
Rapid program(2) VIL VIH VIL Ai VPP DIN
PGM verify VIL VIL VIH Ai VPP DOUT
PGM inhibit VIH XX X V
PP High-Z
Product identification(4) VIL VIL X
A9 = VH(3)
A0 = VIH or VIL
A1 - A17 = VIL
X Identification code
Atmel AT27C020
-55 -90
Operating temperature (case)
Ind. -40C - 85C -40C - 85C
Auto. -40C - 125C
VCC power supply 5V 10% 5V 10%
4
0570H–EPROM–4/11
Atmel AT27C020
Table 5-3. DC and operating characteristics for read operation
Notes: 1. VCC must be applied simultaneously or before VPP , and removed simultaneously or after VPP
2. VPP may be connected directly to VCC except during programming. The supply current would then be the sum of ICC and
IPP .
Table 5-4. AC characteristics for read operation
Symbol Parameter Condition Min Max Units
ILI Input load current VIN = 0V to VCC (Com., Ind.) ±1.0 µA
ILO Output leakage current VOUT = 0V to VCC (Com., Ind.) ±5.0 µA
IPP(2) VPP(1) read/standby current VPP = VCC ±10 µA
ISB VCC(1) standby current
ISB1 (CMOS), CE = VCC 0.3V 100 µA
ISB2 (TTL), CE = 2.0 to VCC
+ 0.5V 1.0 mA
ICC VCC active current f = 5MHz, IOUT = 0mA, CE = VIL 25 mA
VIL Input low voltage -0.6 0.8 V
VIH Input high voltage 2.0 VCC + 0.5 V
VOL Output low voltage IOL = 2.1mA 0.4 V
VOH Output high voltage IOH = -400µA 2.4 V
Symbol Parameter Condition
Atmel AT27C020
Units
-55 -90
Min Max Min Max
tACC(3) Address to output delay CE = OE
= V IL
55 90 ns
tCE(2) CE to output delay OE = VIL 55 90 ns
tOE(2)(3) OE to output delay CE = VIL 20 35 ns
tDF(4)(5) OE or CE high to output float,
Whichever occurred first 18 20 ns
tOH
Output hold from address, CE or OE,
Whichever occurred first 70ns
5
0570H–EPROM–4/11
Atmel AT27C020
Figure 5-1. AC waveforms for read operation(1)
Notes: 1. Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified.
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.
3. OE may be delayed up to tACC - tOE after the address is valid without impact on tACC.
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.
Figure 5-2. Input test waveforms and measurement levels
For -55 devices only:
tR, tF < 5ns (10% to 90%)
For -90 devices only:
tR, tF < 20ns (10% to 90%)
Figure 5-3. Output test load
Note: CL = 100pF including jig capacitance, except -55 devices, where CL = 30pF
0.0V
3.0V
1.5V
AC
DRIVING
LEVELS
AC
MEASUREMENT
LEVEL
6
0570H–EPROM–4/11
Atmel AT27C020
Table 5-5. Pin capacitance
Note: 1. Typical values for nominal supply voltage. This parameter is only sampled, and is not 100% tested.
Figure 5-4. Programming waveforms (1)
Note: 1. The input timing reference is 0.8V for VIL and 2.0V for VIH.
2. tOE and tDFP are characteristics of the device, but must be accommodated by the programmer
3. When programming the Atmel AT27C020, a 0.1µF capacitor is required across VPP and ground to suppress voltage
transients
f = 1MHz, T = 25C(1)
Symbol Typ Max Units Conditions
CIN 4 8 pF VIN = 0V
COUT 812pFV
OUT = 0V
7
0570H–EPROM–4/11
Atmel AT27C020
Table 5-6. DC programming characteristics
Table 5-7. AC programming characteristics
Notes: 1. VCC
must be applied simultaneously with or before VPP and removed simultaneously with or after VPP .
2. This parameter is only sampled and is not 100% tested. Output float is defined as the point where data is no longer driven.
See timing diagram.
3. Program pulse width tolerance is 100µs ± 5%.
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Symbol Parameter Test conditions
Limits
UnitsMin Max
ILI Input load current VIN = VIL, VIH 10 µA
VIL Input low level -0.6 0.8 V
VIH Input high level 2.0 VCC + 1.0 V
VOL Output low voltage IOL = 2.1mA 0.4 V
VOH Output high voltage IOH = -400µA 2.4 V
ICC2 VCC supply current (program and verify) 40 mA
IPP2 VPP supply current CE = PGM = VIL 20 mA
VID A9 product identification voltage 11.5 12.5 V
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V,VPP = 13.0 ± 0.25V
Symbol Parameter Test condition (1)
Limits
UnitsMin Max
tAS Address setup time
Input rise and fall times:
(10% to 90%) 20ns
Input pulse levels:
0.45V to 2.4V
Input timing reference level:
0.8V to 2.0V
Output timing reference level:
0.8V to 2.0V
2µs
tCES CE setup time 2µs
tOES OE setup time 2 µs
tDS Data setup time 2 µs
tAH Address hold time 0 µs
tDH Data hold time 2 µs
tDFP OE high to output float delay(2) 0 130 ns
tVPS VPP setup time 2 µs
tVCS VCC
setup time 2 µs
tPW PGM program pulse width(3) 95 105 µs
tOE Data valid from OE 150 ns
tPRT
VPP pulse rise time during
programming 50 ns
8
0570H–EPROM–4/11
Atmel AT27C020
Table 5-8. The Atmel AT27C020 integrated product identification code
6. Rapid programming algorithm
A 100µs PGM pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and VPP is raised
to 13.0V. Each address is first programmed with one 100µs PGM pulse without verification. Then a
verification/reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10
successive 100µs pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been
applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been
checked. VPP is then lowered to 5.0V and VCC to 5.0V. All bytes are read again and compared with the original data to
determine if the device passes or fails.
Codes
Pins
Hex dataA0 O7 O6 O5 O4 O3 O2 O1 O0
Manufacturer 0 0 0 0 1 1 1 1 0 1E
Device type 1 1 0 0 0 0 1 1 0 86
9
0570H–EPROM–4/11
Atmel AT27C020
Figure 6-1. Rapid programming algorithm
10
0570H–EPROM–4/11
Atmel AT27C020
7. Ordering information
Green package (Pb/halide-free)
tACC
(ns)
ICC (mA)
Atmel ordering code Package Lead finish Operation rangeActive Standby
55 25 0.1 AT27C020-55JU
AT27C020-55PU
32J
32P6
Matte tin
Matte Tin
Industrial
(-40C to 85C)
90 25 0.1 AT27C020-90JU
AT27C020-90PU
32J
32P6
Matte tin
Matte tin
Industrial
(-40C to 85C)
Package type
32J 32-lead, plastic, J-leaded chip carrier (PLCC)
32P6 32-lead, 0.600" wide, plastic, dual inline package (PDIP)
11
0570H–EPROM–4/11
Atmel AT27C020
8. Packaging information
32J – PLCC
DRAWING NO. REV.
TITLE
32J, 32-lead, Plastic J-leaded Chip Carrier (PLCC) B
32J
10/04/01
1.14(0.045) X 45° PIN NO. 1
IDENTIFIER
1.14(0.045) X 45°
0.51(0.020)MAX
0.318(0.0125)
0.191(0.0075)
A2
45° MAX (3X)
A
A1
B1 E2
B
e
E1 E
D1
D
D2
COMMON DIMENSIONS
(Unit of measure = mm)
SYMBOL MIN NOM MAX NOTE
Package Drawing Contact:
packagedrawings@atmel.com
Notes: 1. This package conforms to JEDEC reference MS-016, Variation AE.
2. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is .010"(0.254mm) per side. Dimension D1
and E1 include mold mismatch and are measured at the extreme
material condition at the upper or lower parting line.
3. Lead coplanarity is 0.004" (0.10mm) maximum.
A 3.175 – 3.556
A1 1.524 – 2.413
A2 0.381 – –
D 12.319 – 12.573
D1 11.354 – 11.506 Note 2
D2 9.906 – 10.922
E 14.859 – 15.113
E1 13.894 – 14.046 Note 2
E2 12.471 – 13.487
B 0.660 – 0.813
B1 0.330 – 0.533
e 1.270 TYP
12
0570H–EPROM–4/11
Atmel AT27C020
32P6 – PDIP
TITLE DRAWING NO. REV.
Package Drawing Contact:
packagedrawings@atmel.com
32P6, 32-lead (0.600"/15.24mm wide) Plastic Dual
Inline Package (PDIP) B
32P6
09/28/01
PIN
1
E1
A1
B
REF
E
B1
C
L
SEATING PLANE
A
0º ~ 15º
D
e
eB
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
A – – 4.826
A1 0.381 – –
D 41.783 – 42.291 Note 1
E 15.240 – 15.875
E1 13.462 – 13.970 Note 1
B 0.356 – 0.559
B1 1.041 – 1.651
L 3.048 – 3.556
C 0.203 – 0.381
eB 15.494 – 17.526
e 2.540 TYP
Note: 1. Dimensions D and E1 do not include mold Flash or Protrusion.
Mold Flash or Protrusion shall not exceed 0.25mm (0.010").
13
0570H–EPROM–4/11
Atmel AT27C020
9. Revision history
Doc. Rev. Date Comments
0570H 04/2011 Remove TSOP package
Add lead finish to ordering information
0570G 12/2007
Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131
USA
Tel: (+1) (408) 441-0311
Fax: (+1) (408) 487-2600
www.atmel.com
Atmel Asia Limited
Unit 01-5 & 16, 19F
BEA Tower, Millennium City 5
418 Kwun Tong Road
Kwun Tong, Kowloon
HONG KONG
Tel: (+852) 2245-6100
Fax: (+852) 2722-1369
Atmel Munich GmbH
Business Campus
Parkring 4
D-85748 Garching b. Munich
GERMANY
Tel: (+49) 89-31970-0
Fax: (+49) 89-3194621
Atmel Japan
9F, Tonetsu Shinkawa Bldg.
1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
JAPAN
Tel: (+81) (3) 3523-3551
Fax: (+81) (3) 3523-7581
© 2011 Atmel Corporation. All rights reserved. / Rev.: 0570H–EPROM–4/11
Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel
products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY
RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE
THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to
make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not
be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
Atmel®, logo and combinations thereof, and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trade-
marks of others.
