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參數(shù)資料
| 型號(hào)： | CY7C271A-45WC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | DRAM |
| 英文描述： | 32K x 8 Power Switched and Reprogrammable PROM |
| 中文描述： | 32K X 8 UVPROM, 45 ns, CDIP28 |
| 封裝： | 0.300 INCH, WINDOWED, CERDIP-28 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大小： | 167K |
| 代理商： | CY7C271A-45WC |
CY7C271A
Document #: 38-04013 Rev. *B
Page 4 of 10
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
2
. For an
ultraviolet lamp with a 12 mW/cm
2
power rating, the exposure
time would be approximately 35 minutes. The CY7C271A
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
2
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
packages, please see the PROM Programming Information
located at the end of this section. Programming algorithms can
be obtained from any Cypress representative.
Switching Waveform
t
PU
t
ACE
t
AA
t
PD
CE
O
0
- O
7
A
0
- A
14
CS
1
I
CC
ADDRA
ADDRB
t
AA
DATA A
DATA B
DATA B
t
HZCS
t
ACS
t
HZCE
t
OH
CS
2
ACTIVE
INACTIVE
ACTIVE
Table 1. Programming Electrical Characteristics
Parameter
Description
Min.
Max.
Unit
V
PP
Programming Power Supply
12.5
13
V
I
PP
Programming Supply Current
50
mA
V
IHP
Programming Input Voltage HIGH
3.0
V
CC
V
V
ILP
Programming Input Voltage LOW
–0.5
0.4
V
V
CCP
Programming V
CC
6.0
6.5
V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY7C291A-20JC | 2K x 8 Reprogrammable PROM |
| CY7C291A-50WMB | 2K x 8 Reprogrammable PROM |
| CY7C291AL-35JC | 2K x 8 Reprogrammable PROM |
| CY7C291AL-35PC | 2K x 8 Reprogrammable PROM |
| CY7C291AL-35WC | 2K x 8 Reprogrammable PROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY7C271A-55PC | 制造商:Cypress Semiconductor 功能描述:EPROM OTP 256K-Bit 32K x 8 55ns 28-Pin PDIP |
| CY7C274-35QMB | 制造商:Cypress Semiconductor 功能描述:EPROM UV 256K-Bit 32K x 8 35ns 32-Pin LCC 制造商:Rochester Electronics LLC 功能描述:PROM - Bulk |
| CY7C274-45JC | 制造商:Cypress Semiconductor 功能描述:EPROM OTP 256K-Bit 32K x 8 45ns 32-Pin PLCC |
| CY7C274-55JC | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Cypress Semiconductor 功能描述: |
| CY7C274-55PC | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Cypress Semiconductor 功能描述: |
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