CY7C291A-25SC Cypress Semiconductor Corp, CY7C291A-25SC Datasheet - Page 6

• Manufacturer Part Number: CY7C291A-25SC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C291A-25SC

• Density: 16Kb
• Access Time (max): 25ns
• Package Type: SOIC
• Supply Current: 90mA
• Pin Count: 24
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

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
be approximately 35 minutes.
Table 1. Mode Selection
Document #: 38-04011 Rev. *A
Read
Output Disable
Output Disable
Output Disable
Program
Program Verify
Program Inhibit
Intelligent Program
Blank Check Zeros
Notes:
5.
6.
Mode
X = “don’t care” but not to exceed V
The power-down mode for the CY7C293A is activated by deselecting CS
Read or Output Disable
[6]
2
power rating, the exposure time would
Other
GND
D
D
D
A
A
A
A
A
A
A
A
0
7
6
5
4
3
2
1
0
1
2
CC
1
2
3
4
5
6
7
8
9
10
11
12
+5%.
Top View
7C291A
DIP
24
23
22
21
20
19
18
17
16
15
14
13
A
A
A
A
A
A
A
A
A
A
A
V
A
A
A
V
VFY
PGM
D
D
D
D
D
Figure 1. Programming Pinouts
CC
PP
8
9
10
7
6
5
4
3
10
10
10
10
10
10
10
10
10
10
10
A
A
A
A
A
A
A
A
A
A
A
0
0
0
0
0
0
0
0
0
0
0
1
.
PGM
CS
V
V
V
V
V
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
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.
V
V
X
X
IHP
IHP
IHP
ILP
ILP
IH
IL
3
NC
D
A
A
A
A
A
4
3
2
1
0
0
5
6
7
8
9
10
11
12
Pin Function
4
LCC/PLCC (Opaque Only)
1314151617
Top View
3 2 1
7C291A
VFY
V
V
V
CS
V
V
V
V
28
X
X
IHP
IHP
IHP
ILP
ILP
IH
IL
27
2
2
18
26
is the recommended maximum dosage.
25
24
23
22
21
20
19
[5]
A
V
VFY
PGM
NC
D
D
10
PP
7
6
CS
V
V
V
V
V
V
V
V
X
X
PP
PP
PP
PP
PP
PP
IH
IL
1
CY7C291A
Page 6 of 12
O
High Z
High Z
High Z
High Z
D
O
O
D
D
Zeros
7
7
7
7
7
7
O
D
O
D
O
D
0
0
0
0
0
0