參數(shù)資料
型號(hào)： NT68P81-D01014
廠商： Electronic Theatre Controls, Inc.
英文描述： USB Keyboard Micro-Controller
中文描述： USB鍵盤微控制器
文件頁數(shù)： 12/30頁
文件大?。?/td> 1003K
代理商： NT68P81-D01014
NT68P81
12
OTP ROM Mega Cell Mode Selection
RESET
= 12.75V, VPIL = V
IL
,
VPIH = V
IH
Mode [0..2]
Mode
CE
OE
VPP
DB0-DB7
not VPP
Normal Operating
VPP
000
Output Disable
V
IH
high-Z
VPP
000
Program
V
IH
V
IH
VPP
data in
VPP
000
Program Verify
V
IH
V
IL
data out
VPP
000
Program Inhibit (Standby)
V
IL
VPP
high-Z
VPP
001
Security (Program)
V
IH
VPP
data in
VPP
010
Word-line Stress
VPP
VPP
011
Bit-line Stress
VPP
“0”
VPP
100
OTP Row (after pkg)
V
IH
V
IH
VPP
data in
VPP
101
OTP Column (after pkg)
V
IH
V
IH
VPP
data in
*The security byte is at $0000 address.
READ MODE
The NT68P81's OTP ROM mega cell has 2 control pins.
The CE (chip enable) controls the operation power and is
used for device selection. The OE (output enable)
controls the output buffers.
OUTPUT DISABLE MODE
If OE = V
IH
, the outputs will be in a high impedance state.
So two or more ROMs can be connected together on a
common bus.
STANDBY MODE
By applying a low level to the chip is in standby mode, it
will reduce the operating current to 100μA.
PROGRAM MODE
Initially, all bits are in "1" state which is an erased state.
Thus the program operation is to introduce "0" data into
the desired bit locations by electronic programming.
When the VPP input is at 12.75V and CE is at V
IH
, the chip
is in the PROGRAMMING mode.
PROGRAM VERLFY MODE
The VERIFY mode will check to see that the desired data
is correctly programmed on the programmed bit. The
VERIFY is accomplished with CE at V
IH
, VPP input is at
12.75V, and OE = V
IL
.
PROGRAM INHIBIT
Using this mode, programming of two or more OTP ROMs
in parallel with different data is accomplished. All inputs
except for CE and OE may be commonly connected. The
TTL high level program pulse is only applied to the CE of
the desired device and TTL high level signal is applied to
the other devices.
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