27F256 256K 170ns CMOS Flash Memory

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27F256 CMOS flash memory offers the most cost-effective and reliable alternative for updatable non-volatile memory. The 27F256 adds electrical chip-erasure and reprogramming to familiar EPROM technology. Memory contents can be erased and reprogrammed: in a test socket; in a PROM-programmer socket; onboard during subassembly test; in-system during the final test; and in-system after-sale. The 27F256 increases memory flexibility while contributing to time- and cost savings.

The 27F256 is targeted for alterable code or data-storage applications where EPROM ultraviolet erasure is impractical or time-consuming. The 27F256 can also be applied where traditional EEPROM functionality (byte-erasure) is either not required or not cost-effective. The 27F256 is a 256-kilobit nonvolatile memory organized as 32768 bytes of 8 bits. Intel’s 27F256 is offered in a 28-pin “windowless” credit package. Pin assignments conform to JEDEC standards for byte-wide EPROMs. Intel’s 27F256 employs advanced CMOS circuitry for systems requiring high-performance access speeds, low power consumption, and immunity to noise.

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27F256 Pinout

27F256 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	DQ0	Data Output
12	DQ1	Data Output
13	DQ2	Data Output
14	VSS	Ground Pin
15	DQ3	Data Output
16	DQ4	Data Output
17	DQ5	Data Output
18	DQ6	Data Output
19	DQ7	Data Output
20	CE’	Chip Enable
21	A10	Address Input
22	OE	Output Enable
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