Details

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BUY AT28C64-20JI https://www.utsource.net/itm/p/12535463.html

Parameter	Description	Value
Device Type	High Density CMOS EPROM	AT28C64-20JI
Memory Capacity	Total Memory Size	64 K x 8 bits
Organization	Memory Organization	8,192 x 8 bits
Supply Voltage (Vcc)	Operating Supply Voltage Range	4.5 V to 5.5 V
Programming Voltage	Programming Voltage (Vpp)	12.0 V ± 0.5 V
Access Time	Maximum Access Time (tAC)	20 ns
Write Cycle Time	Typical Write Cycle Time (tWC)	3 ms
Data Retention	Data Retention Time at 25°C	10 years
Operating Temperature	Operating Temperature Range	-40°C to +85°C
Package Type	Package Type	28-Pin Plastic J-Lead
Pin Configuration	Number of Pins	28
Standby Current	Standby Current (Icc)	5 μA (max)
Active Current	Active Current (Icc)	20 mA (max)

Instructions for Use

1. Power Supply:

   • Connect Vcc to a stable 5V supply within the range of 4.5V to 5.5V.
   • Connect Vpp to 12V ± 0.5V during programming.

2. Addressing:

   • Apply the desired address to the address lines (A0-A12) to select the memory location.

3. Data Input/Output:

   • For read operations, the data will be available on the data lines (D0-D7) after the access time (tAC).
   • For write operations, apply the data to the data lines (D0-D7) before initiating the write cycle.

4. Control Signals:

   • Chip Select (CS): Low to enable the device.
   • Output Enable (OE): Low to enable data output.
   • Write Enable (WE): Low to initiate a write cycle.

5. Programming:

   • Ensure Vpp is applied to the appropriate pin during programming.
   • Follow the timing specifications for write cycle time (tWC).

6. Handling:

   • Handle the device with care to avoid static damage.
   • Store in a dry environment to prevent moisture damage.

7. Testing:

   • Verify the device functionality by reading and writing to various memory locations.
   • Ensure all signals meet the specified voltage and timing requirements.

8. Storage:

   • Store the device in a static-protective bag when not in use.

9. Disposal:

   • Dispose of the device according to local regulations for electronic waste.

(For reference only)