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參數(shù)資料
| 型號： | AM27C256-255JI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
| 中文描述： | 32K X 8 OTPROM, 250 ns, PQCC32 |
| 封裝： | PLASTIC, LCC-32 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 90K |
| 代理商： | AM27C256-255JI |
Publication#
08007
Issue Date:
May 1995
Rev.
H
Amendment
/0
2-32
Advanced
Micro
Devices
Am27C256
256 Kilobit (32,768 x 8-Bit) CMOS EPROM
FINAL
DISTINCTIVE CHARACTERISTICS
I
Fast access time
—
55 ns
I
Low power consumption
—
20
μ
A typical CMOS standby current
I
JEDEC-approved pinout
I
Single +5 V power supply
I
±
10% power supply tolerance available
I
100% Flashrite programming
— Typical programming time of 4 seconds
I
Latch-up protected to 100 mA from –1 V to
V
CC
+ 1 V
I
High noise immunity
I
Versatile features for simple interfacing
— Both CMOS and TTL input/output
compatibility
— Two line control functions
I
Standard 28-pin DIP, PDIP, 32-pin TSOP and
PLCC packages
GENERAL DESCRIPTION
The Am27C256 is a 256K-bit ultraviolet erasable pro-
grammable read-only memory. It is organized as 32K
words by 8 bits per word, operates from a single +5 V
supply, has a static standby mode, and features fast sin-
gle address location programming. Products are avail-
able in windowed ceramic DIP packages as well as plas-
tic one time programmable (OTP) PDIP, TSOP, and
PLCC packages.
Typically, any byte can be accessed in less than 55 ns,
allowing operation with high-performance microproces-
sors without any WAIT states. The Am27C256 offers
separate Output Enable (
OE
) and Chip Enable (
CE
)
controls, thus eliminating bus contention in a multiple
bus microprocessor system.
AMD’s CMOS process technology provides high speed,
low power, and high noise immunity. Typical power con-
sumption is only 80 mW in active mode, and 100
μ
W in
standby mode.
All signals are TTL levels, including programming sig-
nals. Bit locations may be programmed singly, in blocks,
or at random. The Am27C256 supports AMD’s Flashrite
programming algorithm (100
μ
s pulses) resulting in typi-
cal programming time of 4 seconds.
BLOCK DIAGRAM
V
CC
V
SS
V
PP
Output Enable
Chip Enable
and
Prog Logic
Y
Decoder
X
Decoder
CE
OE
Output
Buffers
Y
Gating
262,144
Bit Cell
Matrix
A0–A14
Address
Inputs
Data Outputs
DQ0–DQ7
08007H-1
相關PDF資料 |
PDF描述 |
|---|---|
| AM27C256-255PC | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
| AM27C256-255PI | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
| AM27C256-55JC | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
| AM27C256-55JI | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
| AM27C256-45DIB | 256 Kilobit (32 K x 8-Bit) CMOS EPRO |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AM27C256-45DI | 制造商:Rochester Electronics LLC 功能描述: |
| AM27C256-55DC | 制造商:Rochester Electronics LLC 功能描述: |
| AM27C256-55DI | 制造商:Rochester Electronics LLC 功能描述: |
| AM27C25655JC | 制造商:AMD 功能描述:* |
| AM27C256-55PC | 制造商:Rochester Electronics LLC 功能描述: |
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