CY7C235A Datasheet, PDF (1/10 Pages) Cypress Semiconductor – 1K x 8 Registered PROM

1CY7C235A
CY7C235A
1K x 8 Registered PROM
Features
• CMOS for optimum speed/power
• High speed
— 25 ns address set-up
— 12 ns clock to output
• 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
• Slim, 300-mil, 24-pin plastic or hermetic DIP or 28-pin
LCC and PLCC
• 5V ±10% V_CC, commercial and military
• TTL-compatible I/O
• Direct replacement for bipolar PROMs
• 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
A₉
A₈
A₇
ROW
ADDRESS
PROGRAMMABLE
ARRAY
MULTIPLEXER
A₆
A₅
ADDRESS
DECODER
A₄
A₃
A₂
COLUMN
A₁
ADDRESS
A₀
CP
E_S
E
8-BIT
EDGE-
TRIGGERED
REGISTER
CP
Pin Configuration
DIP
Top View
A7 ¹
24 V_CC
O₇
A6 2
23 _A8
A5 ³
22 _A9
O₆
A4 4
A₃ 5
21 _E
20 INIT
A2 6
19 ES
O₅
A₁ 7
18 CP
A0 8
17 O7
O₄
O0 9
16 O6
O1 10
15 ^O5
O₂ 11
14 O4
O₃
GND 12
13 O₃
O₂
LCC/PLCC
O₁
Top View
O₀
4 3 2 1 282726
A₄ 5
25 ^E
A_{3 6}
24 INIT
A_{2 7}
23 ES
A_{1 8}
22 CP
A_{0 9}
21 NC
NC ₁₀
20 O7
O₀
11
12
19
131415161718
O₆
Selection Guide
7C235A-25
7C235A-30
7C235A-40
Unit
Minimum Address Set-Up Time
25
30
40
ns
Maximum Clock to Output
12
15
20
ns
Maximum Operating
Commercial
90
Current
Military
90
90
mA
120
mA
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-04002 Rev. *B
Revised December 27, 2002