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CY7C245A-15JI PDF预览

CY7C245A-15JI

更新时间: 2024-11-26 22:15:23
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 可编程只读存储器
页数 文件大小 规格书
12页 228K
描述
2K x 8 Reprogrammable Registered PROM

CY7C245A-15JI 数据手册

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CY7C245A  
2K x 8 Reprogrammable Registered PROM  
Features  
Functional Description  
The CY7C245A is a high-performance, 2K x 8, electrically  
programmable, read-only memory packaged in a slim 300-mil  
plastic or hermetic DIP. The ceramic package may be  
equipped with an erasure window; when exposed to UV light  
the PROM is erased and can then be reprogrammed. The  
memory cells utilize proven EPROM floating-gate technology  
and byte-wide intelligent programming algorithms.  
• Windowed for reprogrammability  
• CMOS for optimum speed/power  
• High speed  
15-ns address set-up  
10-ns clock to output  
• Low power  
The CY7C245A replaces bipolar devices and offers the advan-  
tages of lower power, reprogrammability, superior perfor-  
mance and high programming yield. The EPROM cell requires  
only 12.5V for the supervoltage, and low current requirements  
330 mW (commercial) for -25 ns  
660 mW (military)  
allow gang programming. The EPROM cells allow each  
memory location to be tested 100%, because each location is  
written into, erased, and repeatedly exercised prior to encap-  
sulation. Each PROM is also tested for AC performance to  
guarantee that after customer programming the product will  
meet AC specification limits.  
• Programmable synchronous or asynchronous output  
enable  
• On-chip edge-triggered registers  
• Programmable asynchronous register (INIT)  
• EPROM technology, 100% programmable  
• Slim, 300-mil, 24-pin plastic or hermetic DIP  
• 5V 10% VCC, commercial and military  
• TTL-compatible I/O  
The CY7C245A has an asynchronous initialize function (INIT).  
This function acts as a 2049th 8-bit word loaded into the  
on-chip register. It is user programmable with any desired  
word, or may be used as a PRESET or CLEAR function on the  
outputs. INIT is triggered by a low level, not an edge.  
• Direct replacement for bipolar PROMs  
• Capable of withstanding greater than 2001V static  
discharge  
Logic Block Diagram  
Pin Configurations  
DIP Top View  
INIT  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
A
A
6
V
CC  
O
7
A
0
2
3
4
A
8
7
O
A
1
A
A
5
9
A
2
A
4
A
10  
PROGRAMMABLE  
ARRAY  
ROW  
6
O
MULTIPLEXER  
5
A
A
3
ADDRESS  
3
INIT  
E/E  
S
A
6
2
A
4
8-BIT  
A
1
5
O
7
8
9
CP  
EDGE-  
A
5
TRIGGERED  
REGISTER  
A
0
O
7
ADDRESS  
DECODER  
A
6
4
O
0
O
6
O
O
10  
11  
12  
O
5
A
1
15  
14  
13  
7
O
O
4
2
3
O
A
8
GND  
O
3
A
9
COLUMN  
LCC/PLCC (Opaque only) Top View  
2
O
ADDRESS  
A
10  
1
O
3 2 1 2827  
26  
4
CP  
A
25 10  
A
5
4
3
PROGRAMMABLE  
MULTIPLEXER  
A
24  
23  
22  
21  
20  
19  
INIT  
6
0
A
E/E  
D
C
Q
2
E/E  
S
S
7
A
1
CP  
NC  
8
A
0
9
CP  
NC  
O
7
10  
11  
O
0
O
6
131415161718  
12  
Selection Guide  
7C245A-15  
7C245A-18  
7C245A-25  
7C245A-35  
Unit  
ns  
Minimum Address Set-up Time  
Maximum Clock to Output  
15  
10  
18  
12  
25  
12  
35  
15  
ns  
Maximum Operating Current Standard Commercial  
Military  
120  
120  
120  
90  
90  
mA  
mA  
120  
120  
Cypress Semiconductor Corporation  
Document #: 38-04007 Rev. *D  
3901 North First Street  
San Jose, CA 95134  
408-943-2600  
RevisedNovember4, 2003  

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