NTE2764 查看數據表（PDF） - NTE Electronics
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NTE2764 Datasheet PDF : 5 Pages
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AC Electrical Characteristics (Cont’d): (VCC = +5V ±5% unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Read Mode and Standby Mode (Cont’d) (TA = +25°C ±5°C, VPP = +21V ±5V, Note 3)
Data Setup Time
tDS
2
Address Hold Time
tAH
0
CE Setup Time
tCES
2
Data Hold Time
tDH
2
Chip Enable to Output Float Delay
tDF
0
Data Valid from OE
tOE
–
Program Pulse Width
tPW
45
VPP Setup Time
tVS
2
–
– µs
–
– µs
–
– µs
–
– µs
– 130 ns
– 150 ns
50 55 ms
–
– µs
Note 3. Test Conditions:
Input Pulse Levels: 0.8V to 2.2V
Input Timing Reference Level: 1.0V and 2.0V
Output Timing Reference Level: 0.8V and 2.0V
Input Rise and fall Times: 20ns
Capacitance: (TA = +25°C, f = 1MHz unless otherwise specified)
Parameter
Symbol
Test Conditions
Input Capacitance
Output Capacitance
CIN
COUT
VIN = 0V
VOUT = 0V
Min Typ Max Unit
–
–
6 pF
–
– 12 pF
Mode Selection: (Note 4)
Mode
CE
Read
VIL
Stanby
VIH
Program
VIL
Program Verify
VIL
Program Inhibit
VIH
Note 4. X can be either VIL or VIH.
OE
PGM
VPP
VCC
O0 – O7
VIL
VIH
VCC
VCC
DOUT
X
X
VCC
VCC
High Z
X
VIL
VPP
VCC
DIN
VIL
VIH
VPP
VCC
DOUT
X
X
VPP
VCC
High Z
Function:
The NTE2764 operates from a single +5V power supply, making it ideal for microprocessor applications.
Programming of the NTE2764 is achieved with a single 50ms TTL pulse. Total programming time for
all 65,536 bits is 420 sec. Due to the simplicity of the programming requirements, devices on boards
and in systems may be easily programmed without any special programmer.
The NTE2764 features a standby mode which reduces the power dissipation from a maximum active
power dissipation of 788mW to a maximum standby power dissipation of 262mW. This results in a
67% savings with no increase in access time.
Erasure of the NTE2764 programmed data can be attained when exposed to light with wavelengths
shorter than approximately 4,000 Angstroms. It should be noted that constant exposure to direct sun-
light or room level fluorescent lighting could erase the NTE2764. Consequently, if the NTE2764 is
to be exposed to these types of lighting conditions for long periods of time, its window should be
masked to prevent unintentional erasure.
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