NM27C128 Datasheet, PDF (9/11 Pages) Fairchild Semiconductor – 131,072-Bit (16K x 8) High Performance CMOS EPROM

Mode Selection
The modes of operation of NM27C128 listed in Table 1. A single 5V power supply is required in the read mode. All inputs are TTL levels
except for V_PP and A9 for device signature.
TABLE 1. Modes Selection
Mode
Pins
CE
OE
PGM
V_PP
V_CC
Outputs
Read
Output Disable
Standby
Programming
Program Verify
Program Inhibit
V_IL
V_IL
V_IH
V_CC
5.0V
D_OUT
X
V_IH
V_IH
V_CC
5.0V
High-Z
V_IH
X
X
V_CC
5.0V
High-Z
V_IL
V_IH
V_IL
12.75V
6.5V
D_IN
V_IL
V_IL
V_IH
12.75V
6.5V
D_OUT
V_IH
X
X
12.75V
6.5V
High-Z
Note 15: X can be V_IL or V_IH.
TABLE 2. Manufacturer’s Identification Code
Pins
A0 A9 O7 O6 O5 O4 O3 O2 O1 O0 Hex
(10) (24) (19) (18) (17) (16) (15) (13) (12) (11) Data
Manufacturer Code V_IL
12V
1
0
0
0
1
1
1
1
8F
Device Code
V_IH
12V
1
0
0
0
0
0
1
1
83
9
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