27C040 4096K 100ns PLCC 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.

27C040 Pinout

27C040 Pin Configuration

Pin Number	Pin Name	Description
1	VPP	Programming Supply
2	A16	Address Input 16
3	A15	Address Input 15
4	A12	Address Input 12
5	A7	Address Input 7
6	A6	Address Input 6
7	A5	Address Input 5
8	A4	Address Input 4
9	A3	Address Input 3
10	A2	Address Input 2
11	A1	Address Input 1
12	A0	Address Input 0
13	O0	Data Output 0
14	O1	Data Output 1
15	O2	Data Output 2
16	VSS	Ground Pin
17	O3	Data Output 3
18	O4	Data Output 4
19	O5	Data Output 5
20	O6	Data Output 6
21	O7	Data Output 7
22	CE’	Chip Enable
23	A10	Address Input 10
24	OE’	Output Enable
25	A11	Address Input 11
26	A9	Address Input 9
27	A8	Address Input 8
28	A13	Address Input 13
29	A14	Address Input 14
30	A17	Address Input 17
31	A18	Address Input 18
32	Vcc	Positive Power Supply