27C128 128K 120ns CMOS EPROM

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The M27C128 is a high-performance 128K UV Erasable Electrically Programmable Read-Only Memory. It is manufactured with National’s latest CMOS split-gate EPROM technology which enables it to operate at speeds as fast as 100 ns access time over the full operating range. The NM27C128 provides microprocessor-based systems with extensive storage capacity for large portions of operating system and application software. Its 100ns access time provides high-speed operation with high-performance CPUs.

The NM27C128 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. The NM27C128 is configured in the standard EPROM pinout which provides an easy upgrade path for systems that are currently using standard EPROMs.

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27C128 Pinout

27C128 Pin Configuration

Pin Number	Pin No	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	O0	Data Output
12	O1	Data Output
13	O2	Data Output
14	GND	Ground
15	O3	Data Output
16	O4	Data Output
17	O5	Data Output
18	O6	Data Output
19	O7	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	PGM	Programming Pin
28	Vcc	Positive Power Supply