鈥?/div>
鈥?660 mW (Military)
Synchronous and asynchronous output enables
On-chip edge-triggered registers
Programmable asynchronous registers (INIT)
EPROM technology, 100% programmable
Slim, 300-mil, 24-pin plastic or hermetic DIP or 28-pin
LCC and PLCC
5V
鹵10%
V
CC
, commercial and military
TTL-compatible I/O
Direct replacement for bipolar PROMs
鈥?Capable of withstanding greater than 2001V static
discharge
Functional Description
The CY7C235A is a high-performance 1024-word by 8-bit
electrically programmable read only memory packaged in a
slim 300-mil plastic or hermetic DIP, 28-pin leadless chip
carrier, or 28-pin plastic leaded chip carrier. The memory cells
utilize proven EPROM floating gate technology and byte-wide
intelligent programming algorithms.
The CY7C235A replaces bipolar devices pin for pin and offers
the advantages of lower power, superior performance, and
high programming yield. The EPROM cell requires only 12.5V
for the supervoltage, and low current requirements allow for
gang programming. The EPROM cells allow for each memory
location to be tested 100%, as each location is written into,
erased, and repeatedly exercised prior to encapsulation. Each
PROM is also tested for AC performance to guarantee that the
product will meet AC specification limits after customer
programming.
Logic Block Diagram
INIT
O
7
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
CP
CP
O
0
COLUMN
ADDRESS
ADDRESS
DECODER
ROW
ADDRESS
PROGRAMMABLE
ARRAY
MUL
TIPLEXER
PROGRAMMABLE
INITIALIZE WORD
O
5
8-BIT
EDGE-
TRIGGERED
REGISTER
O
4
O
3
O
2
O
1
O
6
Pin Configuration
DIP
Top View
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
A
8
A
9
E
INIT
E
S
CP
O
7
O
6
O
5
O
4
O
3
LCC/PLCC
Top View
A5
A6
A7
NC
V CC
A8
A9
A
4
A
3
A
2
A
1
A
0
NC
O
0
4 3 2 1 2827 26
25
5
24
6
23
7
22
8
21
9
20
10
19
11
1314151617 18
12
O1
O2
GND
NC
O3
O4
O5
E
INIT
E
S
CP
NC
O
7
O
6
E
S
E
Selection Guide
Minimum Address Set-Up Time
Maximum Clock to Output
Maximum Operating
Commercial
Current
Military
7C235A-25
25
12
90
7C235A-30
30
15
90
7C235A-40
40
20
90
120
Unit
ns
ns
mA
mA
Cypress Semiconductor Corporation
Document #: 38-04002 Rev. *B
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised December 27, 2002
1
2
3
4
5
6
7
8
9
10
