CY7C225 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – 512 x 8 Registered PROM

1CY7C225A
CY7C225A
512 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
• Buffered common PRESET and CLEAR inputs
• EPROM technology, 100% programmable
• Slim 300-mil, 24-pin plastic or hermetic DIP, 28-pin LCC,
or 28-pin 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 CY7C225A is a high-performance 512-word by 8-bit
electrically programmable read only memory packaged in a
slim 300-mil plastic or hermetic DIP, 28-pin leadless chip
carrier, and 28-pin PLCC. The memory cells utilize proven
EPROM floating gate technology and byte-wide intelligent
programming algorithms.
The CY7C225A replaces bipolar devices and offers the advan-
tages 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
after customer programming the product will meet AC specifi-
cation limits.
Logic Block Diagram
Pin Configurations
A₀
A₁
A₂
ROW
ADDRESS
PROGRAMMABLE
ARRAY
MULTIPLEXER
A₃
A₄
ADDRESS
A₅
DECODER
A₆
A₇
COLUMN
ADDRESS
A₈
8-BIT
EDGE-
TRIGGERED
REGISTER
DIP
Top View
O₇
A₇ ¹
24 V_CC
O₆
A₆ 2
23 _A8
A₅ ³
22 _PS
O₅
A₄ ⁴
A₃ 5
21 _E
20 CLR
O₄
A₂ 6
19 ES
A₁ 7
18 CP
A₀ 8
17 O₇
O₃
O₀ 9
16 O6
O₁ 10
15 ^O5
O₂
O₂ 11
14 O₄
GND 12
13 O₃
O₁
LCC/PLCC
PS
S R CP
O₀
Top View
CLR
CP
E_S
E
4 3 2 1 28 27 26
A₄ 5
A_{3 6}
25 ^E
24 CLR
A_{2 7}
23 ES
A_{1 8}
22 ^CP
A_{0 9}
21 NC
NC ₁₀
20 O7
O_{0 11}
19 O₆
12 13141516 1718
Selection Guide
7C225A-25
7C225A-30
7C225A-40
Unit
Minimum Address Set-Up Time
25
30
40
ns
Maximum Clock to Output
12
15
25
ns
Maximum Operating
Commercial
90
Current
Military
90
mA
120
mA
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-04001 Rev. *B
Revised October 8, 2002