Features
•Fast Read Access Time - 90 ns
•Low Power CMOS Operation
-100 μA max. Standby
-40 mA max. Active at 5 MHz
•JEDEC Standard Packages
-32 Lead PLCC
-32-Lead 600-mil PDIP and Cerdip
-32-Lead 450-mil SOIC (SOP)
-32-Lead TSOP
•5V ± 10% Supply
•High-Reliability CMOS Technology
-2,000V ESD Protection
-200 mA Latchup Immunity
• Rapid™ Programming Algorithm - 50 μs/byte (typical)
•CMOS and TTL Compatible Inputs and Outputs
•Integrated Product Identification Code
•Industrial and Commercial Temperature Ranges
Description
The AT27C080 chip is a low-power, high-performance 8,388,608-bit ultraviolet erasable programmable read only memory (EPROM) organized as 1M by 8 bits. The AT27C080 requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 90 ns, eliminating the need for speed reducing WAIT states on high-performance microprocessor systems.
Atmel’s scaled CMOS technology provides low active power consumption and fast
programming. Power consumption is typically 10 mA in active mode and less than 10 |
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μA in standby mode. |
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(continued) |
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Pin Configurations |
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CDIP, PDIP, SOIC Top View |
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A19 |
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1 |
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32 |
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VCC |
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Pin Name |
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Function |
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A16 |
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2 |
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31 |
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A18 |
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A15 |
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3 |
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30 |
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A17 |
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A0 - A19 |
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Addresses |
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A12 |
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4 |
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29 |
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A14 |
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O0 - O7 |
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Outputs |
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A7 |
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5 |
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28 |
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A13 |
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A6 |
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6 |
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27 |
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A8 |
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Chip Enable |
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A5 |
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7 |
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26 |
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A9 |
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CE |
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A4 |
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8 |
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25 |
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A11 |
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A3 |
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9 |
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24 |
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OE/VPP |
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A2 |
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10 |
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23 |
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A10 |
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OE |
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Output Enable |
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A1 |
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11 |
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22 |
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CE |
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A0 |
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12 |
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21 |
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07 |
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TSOP Top View |
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O0 |
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13 |
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20 |
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06 |
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O1 |
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14 |
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19 |
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05 |
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Type 1 |
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O2 |
15 |
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18 |
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04 |
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GND |
16 |
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17 |
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03 |
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A11 |
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1 |
32 |
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OE/VPP |
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A9 |
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2 |
31 |
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A10 |
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PLCC Top View |
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A8 |
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3 |
30 |
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CE |
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A13 |
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4 |
29 |
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07 |
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A12 |
A15 |
A16 |
A19 |
VCC |
A18 |
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A17 |
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A14 |
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5 |
28 |
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06 |
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A17 |
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6 |
27 |
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05 |
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4 |
3 |
2 |
1 |
32 |
31 |
30 |
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A18 |
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7 |
26 |
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04 |
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A7 |
5 |
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29 |
A14 |
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VCC |
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8 |
25 |
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03 |
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A6 |
6 |
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28 |
A13 |
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A19 |
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9 |
24 |
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GND |
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A5 |
7 |
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27 |
A8 |
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A16 |
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10 |
23 |
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02 |
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A4 |
8 |
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26 |
A9 |
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A15 |
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11 |
22 |
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01 |
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A3 |
9 |
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25 |
A11 |
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A12 |
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12 |
21 |
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O0 |
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A2 |
10 |
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24 |
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OE/VPP |
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A7 |
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13 |
20 |
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A0 |
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A1 |
11 |
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23 |
A10 |
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A6 |
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14 |
19 |
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A1 |
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A0 |
12 |
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22 |
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CE |
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A5 |
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15 |
18 |
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A2 |
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O0 |
13 |
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21 |
07 |
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A4 |
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16 |
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A3 |
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14 |
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16 |
17 |
18 |
19 |
20 |
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01 |
02 |
GND |
03 |
04 |
05 |
06 |
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AT27C080
8-Megabit
(1M x 8)
UV Erasable CMOS EPROM
AT27C080
0360F-B–7/97
1
The AT27C080 is available in a choice of packages, including; one-time programmable (OTP) plastic PLCC, PDIP, SOIC (SOP), and TSOP, as well as windowed ceramic Cerdip. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.
With high density 1M byte storage capability, the AT27C080 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s 27C080 has 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 50 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.
Erasure Characteristics
The entire memory array of the AT27C080 is erased (all outputs read as VOH) after exposure to ultraviolet light at a wavelength of 2,537Å. Complete erasure is assured after a minimum of 20 minutes of exposure using 12,000 μW/cm2 intensity lamps spaced one inch away from the chip. Minimum erase time for lamps at other intensity ratings can be calculated from the minimum integrated erasure dose of 15 W.sec/cm2. To prevent unintentional erasure, an opaque label is recommended to cover the clear window on any UV erasable EPROM that will be subjected to continuous flourescent indoor lighting or sunlight.
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 |
AT27C080 |
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Block Diagram
Absolute Maximum Ratings*
...................Temperature Under Bias |
-55°C to +125°C |
Storage Temperature......................... |
-65°C to +150°C |
Voltage on Any Pin with |
-2.0V to +7.0V(1) |
Respect to Ground ............................ |
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Voltage on A9 with |
-2.0V to +14.0V(1) |
Respect to Ground ......................... |
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VPP Supply Voltage with |
-2.0V to +14.0V(1) |
Respect to Ground .......................... |
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Integrated UV Erase Dose................ |
7258 W•sec/cm2 |
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AT27C080
*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.
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 VCC + 0.75V DC which may overshoot to +7.0V for pulses of less than 20 ns.
Operating Modes
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Mode/Pin |
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CE |
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OE/VPP |
Ai |
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Outputs |
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Read |
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VIL |
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VIL |
Ai |
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DOUT |
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Output Disable |
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X |
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VIH |
X(1) |
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High Z |
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Standby |
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VIH |
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X |
X |
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High Z |
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Rapid Program(2) |
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V |
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V |
PP |
Ai |
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D |
IN |
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IL |
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PGM Verify |
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VIL |
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VIL |
Ai |
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DOUT |
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PGM Inhibit |
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VIH |
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VPP |
X |
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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 |
A0 = V or V |
IL |
Identification Code |
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IL |
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IH |
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A1 - A19 = VIL |
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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 toggled low (VIL) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.
3