27256 256K 250ns EPROM

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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

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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