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The M27256 is a 262,144 bit UV erasable and electrically programmable memory EPROM. It is organized as 32.768 words by 8 bits. The M27256 is housed in a 28 pin Window Ceramic Frit-Seal Dual-in-Line package. The transparent lid allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by following the programming procedure
27256 Pinout
27256 Pin Configuration
Pin Number | Pin Name | Description |
---|---|---|
1 | VPP | Programming Supply |
2 | A12 | Address Input |
3 | A7 | Address Input |
4 | A6 | Address Input |
5 | A5 | Address Input |
6 | A4 | Address Input |
7 | A3 | Address Input |
8 | A2 | Address Input |
9 | A1 | Address Input |
10 | A0 | Address Input |
11 | Q0 | Data Output |
12 | Q1 | Data Output |
13 | Q2 | Data Output |
14 | Vss | Ground |
15 | Q3 | Data Output |
16 | Q4 | Data Output |
17 | Q5 | Data Output |
18 | Q6 | Data Output |
19 | Q7 | Data Output |
20 | E | Chip Enable |
21 | A10 | Address Input |
22 | G/Vpp | Output Enable/Program Supply |
23 | A11 | Address Input |
24 | A9 | Address Input |
25 | A8 | Address Input |
26 | A13 | Address Input |
27 | A14 | Address Input |
28 | Vcc | Positive Power Supply |
27256 Key Features
- Fast Access Time: 200ns
- Extended Temperature Range
- Single 5V Supply Voltage
- Low Standby Current: 35mA max
- Electronic Signature
- Fast Programming Algorithm
You can download this datasheet for 27256 256K 150ns EPROM – Datasheet from the link given below: