27C040-120 4096K 120ns CMOS EPROM

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The NM27C040 is a high-performance, 4,194,304-bit Electrically Programmable UV Erasable Read-Only Memory. It is organized as 512K words of 8 bits each. Its pin-compatibility with byte-wide JEDEC EPROMs enables upgrades through 8 Mbit EPROMs. The “Don’t Care” feature on VPP during reading operations allows memory expansions from 1M to 8 Mbits with no printed circuit board changes.

The NM27C040 provides microprocessor-based systems extensive storage capacity for large portions of operating system and application software. Its 120ns access time provides high-speed operation with high-performance CPUs. The NM27C040 offers a single-chip solution for the code storage requirements of 100% firmware-based equipment. Frequently used software routines are quickly executed from EPROM storage, greatly enhancing system utility.

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27C040 Pinout

27C040 Pin Configuration

Pin Number	Pin No	Description
1	VPP	Programming Supply
2	A16	Address Input
3	A15	Address Input
4	A12	Address Input
5	A7	Address Input
6	A6	Address Input
7	A5	Address Input
8	A4	Address Input
9	A3	Address Input
10	A2	Address Input
11	A1	Address Input
12	A0	Address Input
13	O0	Data Output
14	O1	Data Output
15	O2	Data Output
16	GND	Ground
17	O3	Data Output
18	O4	Data Output
19	O5	Data Output
20	O6	Data Output
21	O7	Data Output
22	CE’	Chip Enable
23	A10	Address Input
24	OE’	Output Enable/Program Supply
25	A11	Address Input
26	A9	Address Input
27	A8	Address Input
28	A13	Address Input
29	A14	Address Input
30	A17	Address Input
31	A18	Address Input
32	VCC	Positive Power Supply