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掳C	90ns
Data Retention	Data Retention Time	10 years
Operating Temperature	Industrial Temperature Range	-40掳C to +85掳C
Storage Temperature	Storage Temperature Range	-65掳C to +150掳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	卤10mA
Input Leakage Current	Input Leakage Current per Pin	卤1渭A
Standby Current	Standby Current at 5V, 25掳C	100渭A
Active Current	Active Current at 5V, 25掳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掳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)