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 600-mil PDIP
–32-Lead PLCC
–32-Lead TSOP
•5V ± 10% Supply
•High-Reliability CMOS Technology
–2,000V ESD Protection
–200 mA Latchup Immunity
• Rapid™ Programming Algorithm - 100 μs/byte (typical)
•CMOS and TTL Compatible Inputs and Outputs
•Integrated Product Identification Code
•Commercial and Industrial Temperature Ranges
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 high performance microprocessor systems.
In read mode, the AT27C020 typically consumes 8 mA. Standby mode supply current is typically less than 10 μA.
Pin Configurations |
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PLCC Top View |
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A12 |
A15 |
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A16 |
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PGM |
A17 |
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Function |
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4 |
3 |
2 |
1 |
32 |
31 |
30 |
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A7 |
5 |
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29 |
A14 |
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A0 - A17 |
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Addresses |
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A6 |
6 |
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28 |
A13 |
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A5 |
7 |
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27 |
A8 |
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O0 - O7 |
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Outputs |
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A4 |
8 |
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26 |
A9 |
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A3 |
9 |
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25 |
A11 |
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A2 |
10 |
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24 |
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CE |
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Chip Enable |
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OE |
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A1 |
11 |
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23 |
A10 |
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A0 |
12 |
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22 |
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OE |
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Output Enable |
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CE |
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O0 |
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21 |
07 |
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14 |
15 |
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19 |
20 |
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PGM |
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Program Strobe |
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01 |
02 |
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GND |
03 |
04 |
05 |
06 |
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PDIP Top View |
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TSOP Top View |
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Type 1 |
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VPP |
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1 |
32 |
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VCC |
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A11 |
1 |
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32 |
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A16 |
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2 |
31 |
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PGM |
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OE |
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A15 |
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3 |
30 |
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A17 |
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A9 |
2 |
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31 |
A10 |
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A12 |
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4 |
29 |
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A14 |
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A8 |
3 |
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30 |
CE |
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A7 |
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5 |
28 |
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A13 |
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A13 |
4 |
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29 |
07 |
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A6 |
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6 |
27 |
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A8 |
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A14 |
5 |
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28 |
06 |
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A5 |
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7 |
26 |
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A9 |
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A17 |
6 |
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27 |
05 |
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PGM |
7 |
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26 |
04 |
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A4 |
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8 |
25 |
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A11 |
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VCC |
8 |
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25 |
03 |
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A3 |
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9 |
24 |
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OE |
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VPP |
9 |
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24 |
GND |
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A2 |
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10 |
23 |
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A10 |
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A16 |
10 |
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23 |
02 |
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A1 |
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11 |
22 |
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CE |
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A15 |
11 |
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22 |
01 |
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A0 |
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12 |
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07 |
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A12 |
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21 |
O0 |
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O0 |
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13 |
20 |
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06 |
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A7 |
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20 |
A0 |
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O1 |
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14 |
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05 |
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A6 |
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19 |
A1 |
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O2 |
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04 |
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A5 |
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18 |
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GND |
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03 |
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A4 |
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17 |
A3 |
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AT27C020 |
2-Megabit |
(256K x 8) |
OTP EPROM |
AT27C020 |
Rev. 0570C-B–12/97 |
1 |
The AT27C020 is available in a choice of industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, and TSOP packages. All devices feature twoline 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.
Atmel’s 27C020 have 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 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.
Block Diagram
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 data sheet 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 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 4.7 μF 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.
2 |
AT27C020 |
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AT27C020 |
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Absolute Maximum Ratings* |
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*NOTICE: |
Stresses beyond those listed under “Absolute |
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Temperature Under Bias.......................-55°C to +125°C |
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Maximum Ratings” may cause permanent |
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Storage Temperature............................-65°C to +150°C |
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damage to the device. This is a stress rating |
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only and functional operation of the device at |
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Voltage on Any Pin with |
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these or any other conditions beyond those |
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Respect to Ground ............................... -2.0V to +7.0V(1) |
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indicated in the operational sections of this |
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specification is not implied. Exposure to abso- |
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Voltage on A9 with |
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lute maximum rating conditions for extended |
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periods may affect device reliability. |
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Respect to Ground ............................ -2.0V to +14.0V(1) |
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Note: 1. |
Minimum voltage is -0.6V DC which may |
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VPP Supply Voltage with |
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undershoot to -2.0V for pulses of less than 20 |
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ns. Maximum output pin voltage is VCC + |
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Respect to Ground ............................. -2.0V to +14.0V(1) |
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0.75V DC which may overshoot to +7.0V for |
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pulses of less than 20 ns. |
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Operating Modes
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Mode/Pin |
CE |
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OE |
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PGM |
Ai |
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VPP |
Outputs |
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Read |
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V |
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V |
IL |
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X(1) |
Ai |
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X |
D |
OUT |
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IL |
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Output Disable |
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X |
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VIH |
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X |
X |
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X |
High Z |
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Standby |
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VIH |
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X |
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X |
X |
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X |
High Z |
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Rapid Program(2) |
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V |
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V |
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V |
IL |
Ai |
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V |
D |
IN |
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IL |
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IH |
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PP |
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PGM Verify |
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VIL |
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VIL |
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VIH |
Ai |
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VPP |
DOUT |
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PGM Inhibit |
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VIH |
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X |
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X |
X |
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VPP |
High Z |
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A9 = V (3) |
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Product Identification(4) |
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H |
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V |
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V |
IL |
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X |
A0 = V |
IH |
or V |
IL |
X |
Identification Code |
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IL |
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A1 - A17 = VIL |
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Notes: 1. X can be VIL or VIH. |
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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 toggled low (VIL) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.
3