Details

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BUY M27C256B-90B1 https://www.utsource.net/itm/p/12591927.html

Parameter	Description	Value
Device Type	High Performance CMOS Mask ROM
Organization	32K x 8
Supply Voltage (Vcc)	Operating Voltage Range	4.5V to 5.5V
Access Time (tAA)	Access Time at 5V, 25°C	90ns
Data Retention	Data Retention Time	10 years
Operating Temperature	Industrial Temperature Range	-40°C to +85°C
Storage Temperature	Storage Temperature Range	-65°C to +150°C
Package Type	Plastic Dual In-Line Package (PDIP)	28-pin
Pin Configuration	Vcc, GND, A0-A14, D0-D7, OE#, CE#
Output Drive Current	Output Drive Current per Pin	±10mA
Input Leakage Current	Input Leakage Current per Pin	±1μA
Standby Current	Standby Current at 5V, 25°C	100μA
Active Current	Active Current at 5V, 25°C	10mA

Instructions for Use

1. Power Supply:

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

2. Addressing:

   • The device has 15 address lines (A0-A14) which are used to select one of the 32,768 memory locations.
   • Address lines should be driven by a stable and noise-free source.

3. Data I/O:

   • The data lines (D0-D7) are used to read data from the selected memory location.
   • Data lines are tri-stated when the output enable (OE#) pin is high.

4. Control Signals:

   • Chip Enable (CE#): When low, the device is active and can be accessed. When high, the device is in a high-impedance state.
   • Output Enable (OE#): When low, the data lines are enabled and the data from the selected memory location is output. When high, the data lines are tri-stated.

5. Timing:

   • Ensure that the access time (t_AA) is respected to avoid data corruption. The device has a typical access time of 90ns at 5V and 25°C.
   • Proper timing must be maintained for all control signals to ensure reliable operation.

6. Handling:

   • Handle the device with care to avoid static discharge and physical damage.
   • Store the device in a dry and cool environment to prevent degradation.

7. Testing:

   • Before integrating the device into a system, perform basic functionality tests to ensure it meets the specified parameters.
   • Use a logic analyzer or similar tool to verify the correct operation of the device.

8. Environmental Considerations:

   • Operate the device within the specified temperature ranges to ensure reliable performance and longevity.
   • Avoid exposing the device to extreme temperatures or humidity during storage and operation.

By following these instructions, you can ensure the optimal performance and reliability of the M27C256B-90B1 device.

(For reference only)