Specifications:

Mounting Style: Through Hole
Package/Case: FDIP-28W
Type: OTP, UV
Memory Size: 256 kB
Organisation: 32 k x 8
Interface Type: Parallel
Operating Supply Current: 50 mA
Programming Voltage: 12.75 V
Supply Voltage - Max: 5 V
Supply Voltage - Min: 5 V
Minimum Operating Temperature: 0 C
Maximum Operating Temperature: 70 C
Series: M27C256B-12
Packaging: Tube
Access Time: 120 ns
Output Enable Access Time: 60 ns
Product Type: EPROM