1CY7C235A
CY7C235A
1K x 8 Registered PROM
• Direct replacement for bipolar PROMs
Features
• Capable of withstanding greater than 2001V static dis-
charge
• CMOS for optimum speed/power
• High speed
Functional Description
— 18 ns address set-up
— 12 ns clock to output
The CY7C235A is a high-performance 1024 word by 8 bit elec-
trically 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 intelli-
gent programming algorithms.
• Low power
— 495 mW (commercial)
— 660 mW (military)
• Synchronous and asynchronous output enables
• On-chip edge-triggered registers
• Programmable asynchronous registers (INIT)
• EPROM technology, 100% programmable
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 pro-
gramming.
• Slim, 300-mil, 24-pin plastic or hermetic DIP or 28-pin
LCC and PLCC
• 5V ±10% V , commercial and military
CC
• TTL-compatible I/O
Logic Block Diagram
Pin Configuration
DIP
Top View
INIT
1
2
3
4
5
6
24
23
22
21
V
A
A
6
CC
7
O
A
8
7
A
A
9
5
A
9
A
4
E
INIT
E
S
O
6
20
19
A
3
A
8
PROGRAMMABLE
ARRAY
ROW
MULTIPLEXER
A
2
ADDRESS
A
7
A
1
O
5
7
8
9
10
11
12
18
17
16
CP
O
7
O
6
O
5
A
0
8-BIT
A
6
EDGE-
O
O
4
0
A
5
TRIGGERED
REGISTER
ADDRESS
DECODER
O
1
15
14
13
O
O
4
A
4
2
O
3
GND
O
3
A
3
C235A-2
A
2
O
2
COLUMN
ADDRESS
LCC/PLCC
Top View
A
1
O
1
A
0
O
0
CP
3 2 1 2827
4
26
E
25
24
23
22
21
20
19
A
4
3
5
CP
INIT
A
6
E
A
S
2
7
CP
NC
A
1
8
A
0
9
E
S
NC
O
C235A-1
7
10
O
O
6
11
0
131415161718
12
E
C235A-3
Selection Guide
7C235A-18
7C235A-25
7C235A-30
7C235A-40
Minimum Address Set-Up Time (ns)
Maximum Clock to Output (ns)
18
12
90
25
12
30
15
40
20
Maximum Operating
Current (mA)
Commercial
Military
90
90
90
120
120
120
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
November 1992 – Revised March 1995