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參數(shù)資料
| 型號： | CY7C291A-25WC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | DRAM |
| 英文描述： | 2K x 8 Reprogrammable PROM |
| 中文描述： | 2K X 8 UVPROM, 25 ns, CDIP24 |
| 封裝： | 0.300 INCH, WINDOWED, CERDIP-24 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 275K |
| 代理商： | CY7C291A-25WC |
CY7C291A
Document #: 38-04011 Rev. *A
Page 6 of 12
Erasure Characteristics
Wavelengths of light less than 4000 Angstroms begin to erase
these PROMs. 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 x exposure time) of 25 Wsec/cm2. For an ultraviolet
lamp with a 12 mW/cm
2
power rating, the exposure time would
be approximately 35 minutes.
These PROMs need 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 Information
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.
Table 1. Mode Selection
Pin Function
[5]
Read or Output Disable
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
A
10
A
0
CS
3
CS
2
CS
1
O
7
O
0
D
7
D
0
O
7
O
0
Mode
Other
PGM
VFY
V
PP
V
IL
Read
Output Disable
[6]
V
IH
V
IH
X
X
V
IH
High Z
Output Disable
X
V
IL
X
High Z
Output Disable
V
IL
X
X
High Z
Program
V
ILP
V
IHP
V
PP
D
7
D
0
O
7
O
0
Program Verify
V
IHP
V
ILP
V
PP
Program Inhibit
V
IHP
V
IHP
V
PP
High Z
Intelligent Program
V
ILP
V
IHP
V
PP
D
7
D
0
Blank Check Zeros
V
IHP
V
ILP
V
PP
Zeros
Notes:
5.
6.
X =
“
don
’
t care
”
but not to exceed V
+5%.
The power-down mode for the CY7C293A is activated by deselecting CS
1
.
Figure 1. Programming Pinouts
1
2
3
4
5
6
7
8
9
10
11
12
16
15
17
18
19
20
24
23
22
21
13
14
A
8
A
9
A
10
V
PP
VFY
PGM
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
D
0
D
1
D
2
GND
V
CC
D
7
D
6
D
5
D
4
D
3
28
4
5
6
7
8
9
10
1112
3 2 1
27
1314151617
26
25
24
23
22
21
20
19
A
VC
G
A
A
D
D
D
0
18
D
D
NC
A
0
A
4
A
3
A
2
A
1
A
N
N
D
7
D
6
D
A
10
V
PP
VFY
PGM
NC
A
DIP
LCC/PLCC (Opaque Only)
Top View
Top View
7C291A
7C291A
相關PDF資料 |
PDF描述 |
|---|---|
| CY7C291A-35QMB | MICROMINIATURE POLARIZED LATCHING RELAY |
| CY7C291A-20SC | 2K x 8 Reprogrammable PROM |
| CY7C291A-30WMB | 2K x 8 Reprogrammable PROM |
| CY7C291AL-25JC | 2K x 8 Reprogrammable PROM |
| CY7C291AL-25PC | 2K x 8 Reprogrammable PROM |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CY7C291A-35DMB | 制造商:Cypress Semiconductor 功能描述: |
| CY7C291A-35JC | 制造商:Cypress Semiconductor 功能描述:EPROM OTP 16K-Bit 2K x 8 35ns 28-Pin PLCC |
| CY7C291A-35JCT | 制造商:Cypress Semiconductor 功能描述:EPROM OTP 16K-Bit 2K x 8 35ns 28-Pin PLCC T/R |
| CY7C291A-35PC | 制造商:Cypress Semiconductor 功能描述:EPROM OTP 16K-Bit 2K x 8 35ns 24-Pin PDIP |
| CY7C291A-35WC | 制造商:Cypress Semiconductor 功能描述:EPROM UV 16K-Bit 2K x 8 35ns 24-Pin Windowed CDIP |
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