CY7C271A-35WC Cypress Semiconductor Corp, CY7C271A-35WC Datasheet - Page 4

• Manufacturer Part Number: CY7C271A-35WC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C271A-35WC

• Density: 256Kb
• Organization: 32Kx8
• Interface Type: Parallel
• In System Programmable: In System/External
• Frequency (max): Not RequiredMHz
• Access Time (max): 35ns
• Package Type: Windowed CDIP
• Reprogramming Technique: UV
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 50mA
• Pin Count: 28
• Mounting: Through Hole
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

Switching Waveform
Erasure Characteristics
Wavelengths of light less than 4000 Angstroms begin to erase
the CY7C271A 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 multiplied by exposure time) of 25 Wsec/cm
ultraviolet lamp with a 12 mW/cm
time would be approximately 35 minutes. The CY7C271A
Table 1. Programming Electrical Characteristics
Document #: 38-04013 Rev. *B
V
I
V
V
V
PP
PP
IHP
ILP
CCP
A
O
0
0
- A
- O
CS
CS
I
CE
CC
14
Parameter
7
2
1
t
PU
t
ACE
Programming Power Supply
Programming Supply Current
Programming Input Voltage HIGH
Programming Input Voltage LOW
Programming V
2
t
AA
ADDRA
power rating, the exposure
DATA A
CC
Description
2
ACTIVE
. For an
t
AA
ADDRB
DATA B
needs to be within 1 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/cm
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
packages, please see the PROM Programming Information
located at the end of this section. Programming algorithms can
be obtained from any Cypress representative.
t
HZCS
2
is the recommended maximum dosage.
INACTIVE
t
OH
t
Min.
12.5
–0.5
ACS
3.0
6.0
ACTIVE
DATA B
t
PD
Max.
V
0.4
6.5
13
50
CC
CY7C271A
Page 4 of 10
t
HZCE
Unit
mA
V
V
V
V