CY7C287 Просмотр технического описания (PDF) - Cypress Semiconductor
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CY7C287 Datasheet PDF : 8 Pages
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CY7C287
Switching Waveform
A0 − A15
ES
CP
O0 − O7
E
tHA
tPWC
tCO
tSA
tHA
tSEs
tPWC
tHEs
VALID
tHZC
tHZE
tSEs
tCOs
HIGH Z
tDOE
Erasure Characteristics
Wavelengths of light less than 4000 Angstroms begin to erase
the CY7C287 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 pe-
riods of time.
The recommended dose of ultraviolet light for erasure is a
wavelength of 2537 angstroms for a minimum dose (UV inten-
sity multiplied by exposure time) of 25 Wsec/cm2. For an ultra-
violet lamp with a 12 mW/cm2 power rating, the exposure time
would be approximately 35 minutes. The CY7C287 needs to
Table 1. CY7C287 Mode Selection
Mode: Read or Output Disable
CP
Synchronous Read
Output Disable – Asynchronous
VIL/VIH
X
Output Disable – Synchronous
Mode: Other
VIL/VIH
PGM
Program
Program Verify
Program Inhibit
Blank Check
Notes:
7. X = “don’t care” but not to exceed VCC ±5%. X can be VIL ir VIH.
VILP
VIHP
VIHP
VIHP
be within 1 inch of the lamp during erasure. Permanent dam-
age 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.
Programming Modes
Programming support is available from Cypress as well as
from a number of third-party software vendors. For detailed
programming information, including a listing of software pack-
ages, please see the PROM Programming Information located
at the end of this section. Programming algorithms can be ob-
tained from any Cypress representative.
A14
A14
A14
A14
LATCH
VILP
VILP
VILP
VILP
Pin Function[7]
E, ES
VIL
VIH
VIH
VFY
VIHP
VILP
VIHP
VILP
A15
A15
A15
A15
VPP
VPP
VPP
VPP
VPP
O7 − O0
O7 − O0
High Z
High Z
D7 − D0
D7 − D0
O7 − O0
High Z
Zeros
4
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