Details

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BUY 84256A-10L https://www.utsource.net/itm/p/12610272.html

Parameter	Description	Value
Part Number	Part number	84256A-10L
Type	Type of device	CMOS Static RAM
Organization	Organization	Texas Instruments (TI)
Function	Functionality	32K x 8-bit SRAM
Supply Voltage (Vcc)	Operating supply voltage	5.0 V 卤 0.25 V
Operating Temperature	Temperature range for operation	-40掳C to +85掳C
Access Time	Maximum access time	10 ns
Data Retention	Data retention time at maximum operating temperature	10 years
Power Consumption	Typical power consumption at 5V, 10 MHz	150 mW
Standby Current	Standby current	5 渭A
Package	Package type	28-pin PDIP
Pins	Number of pins	28
Input/Output	Number of input/output lines	8
Address Lines	Number of address lines	15
Control Lines	Control lines (Chip Select, Write Enable, Output Enable)	CS, WE, OE

Instructions for Use

1. Power Supply:

   • Ensure that the supply voltage (Vcc) is within the specified range of 4.75V to 5.25V.
   • Connect the ground (GND) pin to a stable ground reference.

2. Addressing:

   • Connect the 15 address lines (A0-A14) to the appropriate address lines of your system.
   • Address lines should be driven with a valid logic level (0V for low, 5V for high).

3. Data I/O:

   • Connect the 8 data lines (D0-D7) to the data bus of your system.
   • Data lines can be read or written based on the control signals.

4. Control Signals:

   • Chip Select (CS): Active low. When low, the chip is selected and can be accessed.
   • Write Enable (WE): Active low. When low, data is written to the memory.
   • Output Enable (OE): Active low. When low, data is read from the memory.

5. Timing:

   • Ensure that the access time (tAC) is not exceeded. The maximum access time is 10 ns.
   • Proper timing must be maintained for all control signals to ensure reliable operation.

6. Power-Up and Power-Down:

   • During power-up, ensure that Vcc rises to its nominal value before applying any control signals.
   • During power-down, ensure that all control signals are held in a safe state (high impedance or grounded) before Vcc drops below the minimum operating voltage.

7. Storage and Handling:

   • Store the device in a dry, static-free environment.
   • Handle the device with care to avoid damage to the pins and internal components.

8. Testing:

   • Before integrating the device into a system, perform basic tests to verify functionality, such as reading and writing to various memory locations.

By following these instructions, you can ensure reliable and efficient operation of the 84256A-10L CMOS Static RAM.

(For reference only)