Features
•Fast Read Access Time - 55 ns
•Low Power CMOS Operation
–100 μA Maximum Standby
–35 mA Maximum Active at 5 MHz
•JEDEC Standard Packages
–40-Lead 600 mil PDIP
–44-Lead PLCC
–40-Lead TSOP (10 mm X 14 mm)
•Direct Upgrade from 512K bit and 1M bit (AT27C516 and AT27C1024) EPROMs
•5V ± 10% Power Supply
•High Reliability CMOS Technology
–2,000V ESD Protection
–200 mA Latchup Immunity
• Rapid™ Programming Algorithm - 50 μs/word (typical)
•CMOS and TTL Compatible Inputs and Outputs
•Integrated Product Identification Code
•Commercial and Industrial Temperature Ranges
Description
The AT27C2048 is a low-power, high performance 2,097,152-bit one-time programmable read only memory (OTP EPROM) organized 128K by 16 bits. It requires a single 5V power supply in normal read mode operation. Any word can be accessed in less than 55 ns, eliminating the need for speed-reducing WAIT states. The by-16 organization makes this part ideal for high-performance 16 and 32 bit microprocessor systems.
(continued)
Pin Configurations |
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PDIP Top View |
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Pin Name |
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VPP |
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40 |
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VCC |
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2 |
39 |
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A0 - A16 |
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Addresses |
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CE |
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PGM |
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O15 |
3 |
38 |
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A16 |
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O14 |
4 |
37 |
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A15 |
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O0 - O15 |
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Outputs |
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O13 |
5 |
36 |
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A14 |
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O12 |
6 |
35 |
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A13 |
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O11 |
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34 |
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A12 |
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O10 |
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A11 |
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CE |
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Chip Enable |
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O9 |
9 |
32 |
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A10 |
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O8 |
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31 |
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A9 |
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GND |
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30 |
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GND |
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OE |
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Output Enable |
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O7 |
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A8 |
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O6 |
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28 |
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A7 |
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Program |
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PGM |
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O5 |
14 |
27 |
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A6 |
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O4 |
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26 |
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A5 |
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O3 |
16 |
25 |
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A4 |
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NC |
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No Connect |
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O2 |
17 |
24 |
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A3 |
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O1 |
18 |
23 |
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A2 |
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Both GND pins must be con- |
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O0 |
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A1 |
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20 |
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A0 |
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OE |
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nected. |
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PLCC Top View |
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TSOP Top View |
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O13 |
O14 |
O15 |
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CE |
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VPP |
DC |
VCC |
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PGM |
A16 |
A15 |
A14 |
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Type 1 |
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6 |
5 |
4 |
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3 |
2 |
1 |
44 |
43 |
42 |
41 |
40 |
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A9 |
1 |
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40 |
GND |
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A10 |
2 |
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39 |
A8 |
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O12 |
7 |
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39 |
A13 |
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A11 |
3 |
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38 |
A7 |
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O11 |
8 |
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38 |
A12 |
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A12 |
4 |
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A6 |
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O10 |
9 |
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37 |
A11 |
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A13 |
5 |
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36 |
A5 |
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O9 |
10 |
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36 |
A10 |
A14 |
6 |
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35 |
A4 |
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O8 |
11 |
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35 |
A9 |
A15 |
7 |
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34 |
A3 |
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GND |
12 |
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34 |
GND |
A16 |
8 |
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33 |
A2 |
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PGM |
9 |
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32 |
A1 |
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NC |
13 |
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33 |
NC |
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VCC |
10 |
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31 |
A0 |
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O7 |
14 |
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32 |
A8 |
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VPP |
11 |
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30 |
OE |
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O6 |
15 |
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31 |
A7 |
CE |
12 |
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29 |
O0 |
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O5 |
16 |
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30 |
A6 |
O15 |
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28 |
O1 |
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O4 |
17 |
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21 |
22 |
23 |
24 |
25 |
26 |
27 |
29 |
A5 |
O14 |
14 |
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27 |
O2 |
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18 |
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O13 |
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26 |
O3 |
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O12 |
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25 |
O4 |
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O3 |
O2 |
O1 |
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O0 |
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OE |
DC |
A0 |
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A1 |
A2 |
A3 |
A4 |
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O11 |
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24 |
O5 |
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O10 |
18 |
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23 |
O6 |
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Note: |
PLCC package pins 1 and 23 |
O9 |
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22 |
O7 |
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O8 |
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21 |
GND |
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are DON’T CONNECT.
AT27C2048
2-Megabit
(128K x 16) OTP EPROM
AT27C2048
0632B-A–06/97
1
Description
In read mode, the AT27C2048 typically consumes 15 mA. Standby mode supply current is typically less than 10 μA.
The AT27C2048 is available in industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, and TSOP packages. The device features two-line control (CE, OE) to eliminate bus contention in high-speed systems.
With high density 128K word storage capability, the AT27C2048 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s AT27C2048 has additional features that 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/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 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 |
AT27C2048 |
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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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AT27C2048
*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: Maximum 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 |
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PGM |
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Ai |
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VPP |
Outputs |
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Read |
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V |
IL |
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V |
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X(1) |
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Ai |
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X(1) |
D |
OUT |
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IL |
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Output Disable |
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X |
VIH |
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X |
High Z |
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Standby |
V |
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X |
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X |
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X(5) |
High Z |
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IH |
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Rapid Program(2) |
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V |
IL |
V |
IH |
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Ai |
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PP |
D |
IN |
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IL |
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PGM Verify |
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VIL |
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VIH |
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VPP |
DOUT |
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PGM Inhibit |
VIH |
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X |
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VPP |
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A9 = V |
(3) |
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Product Identification(4) |
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V |
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X |
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A0 = V |
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H |
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V |
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Identification Code |
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IL |
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IH |
or V |
IL |
CC |
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IL |
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A1 - A16 = VIL |
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Notes: 1. X can be VIL or VIH.
2.Refer to the Programming characteristics.
3.VH = 12.0 ± 0.5V.
4.Two identifier words 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 word and high (VIH) to select the Device Code word.
5.Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.
3