CY7C265(2006) Ver la hoja de datos (PDF) - Cypress Semiconductor
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CY7C265 Datasheet PDF : 13 Pages
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CY7C265
Switching Characteristics Over the Operating Range[2, 4] (continued)
Parameter
tHZE
Description
Output Inactive from E HIGH
(Async. Mode)
7C265-15
7C265-25
7C265-40
7C265-50
Min. Max. Min. Max. Min. Max. Min. Max. Unit
12
15
20
25
ns
Switching Waveform
ADDRESS
SYNCHRONOUS
ENABLE
(PROGRAMMABLE)
tSES
CLOCK
tAS
tHES
tPWC
OUTPUT
tDI
ASYNCHRONOUS INIT
(PROGRAMMABLE)
ASYNCHRONOUS
ENABLE
VALID DATA
tPWI
tRI
tHZC
tAH
tCOS
tCO
tHZE
tDOE
Erasure Characteristics
Wavelengths of light less than 4000 angstroms begin to erase
the 7C265 in the windowed package. For this reason, an
opaque label should be placed over the window if the PROM
is exposed to sunlight or fluorescent lighting for extended
periods of time.
The recommended dose of ultraviolet light for erasure is a
wavelength of 2537 angstroms for a minimum dose (UV
intensity • exposure time) of 25 Wsec/cm2. For an ultraviolet
lamp with a 12 mW/cm2 power rating the exposure time would
be approximately 45 minutes. The 7C265 needs to be within
one inch of the lamp during erasure. Permanent damage may
result if the PROM is exposed to high-intensity UV light for an
extended period of time. 7258 Wsec/cm2 is the recommended
maximum dosage.
Bit Map Data
Programmer Address (Hex.)
Decimal
Hex
RAM Data
Contents
Bit Map Data
0
.
.
8191
8192
8193
0
.
.
1FFF
2000
2001
Data
.
.
Data
INIT Byte
Control Byte
Control Byte
00 Asynchronous output enable (default condition)
01 Synchronous output enable
02 Asynchronous initialize
Programming Modes
The 7C265 offers a limited selection of programmed architec-
tures. Programming these features should be done with a
single 10-ms-wide pulse in place of the intelligent algorithm,
mainly because these features are verified operationally, not
with the VFY pin. Architecture programming is implemented by
applying the supervoltage to two additional pins during
programming. In programming the 7C265 architecture, VPP is
applied to pins 3, 9, and 22. The choice of a particular mode
depends on the states of the other pins during programming,
so it is important that the condition of the other pins be met as
set forth in the mode table. The considerations that apply with
Document #: 38-04012 Rev. *B
Page 5 of 13
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