Details

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BUY HN27C256AG-15 https://www.utsource.net/itm/p/6526640.html
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Parameter	Description	Value	Unit
Device Type	CMOS 256K x 8-bit UV EPROM
Package Type	DIP-28, PLCC-28
Operating Voltage (Vcc)	Supply voltage range	4.5 to 5.5	V
Access Time	Time from address valid to data valid	150	ns
Data Retention	Duration data is retained without power	10	years
Endurance	Number of write/erase cycles	100,000	cycles
Organization	Memory organization	256K x 8	bits
Temperature Range	Operating temperature range	-40 to +85	掳C
Storage Temperature	Temperature range for storage	-65 to +150	掳C

Instructions for HN27C256AG-15

1. Power Supply:

   • Ensure the supply voltage (Vcc) is within the specified range of 4.5V to 5.5V.
   • Connect ground (GND) to a stable earth potential.

2. Addressing:

   • Provide the correct address lines (A0-A17) to access the desired memory location.
   • Address lines should be stable before the access time requirement.

3. Data Output:

   • The output data (D0-D7) will become valid after the specified access time once the address is stable.

4. Write Protection:

   • This device is an EPROM and does not support in-circuit writing. Programming must be done using a UV erasable programmer.

5. Erase Operation:

   • To erase the contents, expose the device to ultraviolet light through the quartz window for approximately 20 minutes.

6. Handling Precautions:

   • Handle with care to avoid damage to pins and the UV-transparent window.
   • Store in a protective container when not in use to prevent accidental exposure to UV light.

7. Environmental Conditions:

   • Operate within the specified temperature range to ensure reliable performance.
   • Store in environments where temperatures do not exceed the storage temperature limits.

8. Mounting:

   • Ensure proper mounting on the PCB to avoid mechanical stress on the package.
   • Follow standard reflow soldering profiles suitable for the package type used.

(For reference only)