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27C256 Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 27C256
Description  262,144-Bit (32K x 8) High Performance CMOS EPROM
PDF  12 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

27C256 Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Mode Selection
The modes of operation of NM27C256 listed in Table I A single 5V power supply is required in the read mode All inputs are TTL
levels except for VPP and A9 for device signature
TABLE I Modes Selection
Pins
CE PGM
OE
VPP
VCC
Outputs
Mode
Read
VIL
VIL
VCC
50V
DOUT
Output Disable
X
VIH
VCC
50V
High-Z
(Note 1)
Standby
VIH
XVCC
50V
High-Z
Programming
VIL
VIH
1275V
625V
DIN
Program Verify
VIH
VIL
1275V
625V
DOUT
Program Inhibit
VIH
VIH
1275V
625V
High-Z
Note 1
X can be VIL or VIH
TABLE II 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
VIL
12V
10001111
8F
Device Code
VIH
12V
00000100
04
9



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