Details

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BUY AT49F040-12TI https://www.utsource.net/itm/p/1329967.html
4-Megabit 512K x 8 5-volt Only CMOS Flash Memory

Parameter	Description	Value	Unit
Device Type	Flash Memory	-	-
Density	Memory Size	512 K x 8	bits
VCC Operating Range	Supply Voltage	2.7 to 3.6	V
VPP Programming Voltage	Programming Voltage	12.0	V
ICC Active	Active Current	20	mA
ICC Standby	Standby Current	1	μA
Access Time	Read Access Time	70	ns
Page Size	Page Size for Program Operation	32	bytes
Programming Time	Typical Programming Time per Byte	1	ms
Erase Time	Typical Erase Time (Entire Device)	1	s
Endurance	Write/Erase Cycles	100,000	cycles
Data Retention	Data Retention Time	10	years
Operating Temperature Range	Operating Temperature	-40 to +85	°C
Package Type	Package	24-pin PDIP, TSSOP	-
Order Code	Order Code	AT49F040-12TI	-

Instructions:

1. Power Supply:

   • Connect V_CC to the supply voltage (2.7 to 3.6V).
   • Connect V_PP to the programming voltage (12.0V) during program operations.
   • Ground all other necessary pins.

2. Addressing:

   • Use the address lines (A0-A18) to select the memory location you want to read from or write to.

3. Data Input/Output:

   • Use the data lines (D0-D7) to transfer data to and from the device.

4. Control Signals:

   • CE (Chip Enable): Low to enable the device.
   • OE (Output Enable): Low to enable data output.
   • WE (Write Enable): Low to initiate a write operation.
   • WP (Write Protect): High to allow writes, low to prevent writes.

5. Programming:

   • Apply the programming voltage (V_PP) to the appropriate pin.
   • Set the address and data lines to the desired values.
   • Assert the WE signal to start the write operation.
   • Wait for the typical programming time (1ms per byte).

6. Erasing:

   • Apply the programming voltage (V_PP) to the appropriate pin.
   • Assert the erase command.
   • Wait for the typical erase time (1 second for the entire device).

7. Reading:

   • Set the address lines to the desired memory location.
   • Assert the CE and OE signals.
   • Read the data from the data lines.

8. Handling Precautions:

   • Avoid exceeding the maximum ratings to prevent damage.
   • Ensure proper grounding and decoupling capacitors to maintain stability.
   • Follow the recommended operating conditions to ensure reliable performance.

(For reference only)