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Número de pieza | AM27X256-90JC | |
Descripción | 256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device | |
Fabricantes | Advanced Micro Devices | |
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Am27X256
256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device
DISTINCTIVE CHARACTERISTICS
s As an OTP EPROM alternative:
— Factory optimized programming
— Fully tested and guaranteed
s As a Mask ROM alternative:
— Shorter leadtime
— Lower volume per code
s Fast access time
— 55 ns
s Single +5 V power supply
s Compatible with JEDEC-approved EPROM
pinout
s ±10% power supply tolerance
s High noise immunity
s Low power dissipation
— 20 µA maximum CMOS standby current
s Available in Plastic Dual-In-line Package (PDIP)
and Plastic Leaded Chip Carrier (PLCC)
s Latch-up protected to 100 mA from –1 V to
VCC + 1 V
s Versatile features for simple interfacing
— Both CMOS and TTL input/output compatibility
— Two line control functions
GENERAL DESCRIPTION
The Am27X256 is a factory programmed and tested
OTP EPROM. It is programmed after packaging prior to
final test. Every device is rigorously tested under AC
and DC operating conditions to your stable code. It is
organized as 32 Kwords by 8 bits per word and is avail-
able in plastic dual in-line packages (PDIP), as well as
plastic leaded chip carrier (PLCC) packages. Express-
ROM devices provide a board-ready memory solution
for medium to high volume codes with short leadtimes.
This offers manufacturers a cost-effective and flexible
alternative to OTP EPROMs and mask programmed
ROMs.
Data can be accessed as fast as 55 ns, allowing
high-performance microprocessors to operate with re-
duced WAIT states. The device offers separate Output
Enable (OE#) and Chip Enable (CE#) controls, thus
eliminating bus contention in a multiple bus micropro-
cessor system.
AMD’s CMOS process technology provides high
speed, low power, and high noise immunity. Typical
power consumption is only 80 mW in active mode, and
100 µW in standby mode.
BLOCK DIAGRAM
OE#
CE#
A0–A14
Address
Inputs
VCC
VSS
Output Enable
Chip Enable
and
Prog Logic
Y
Decoder
X
Decoder
Data Outputs DQ0–DQ7
Output
Buffers
Y
Gating
262,144
Bit Cell
Matrix
12082F-1
Publication# 12082 Rev: F Amendment/0
Issue Date: May 1998
1 page ABSOLUTE MAXIMUM RATINGS
Storage Temperature
OTP Products. . . . . . . . . . . . . . . . . . –65°C to +125°C
Ambient Temperature
with Power Applied. . . . . . . . . . . . . . –55°C to +125°C
Voltage with Respect to VSS
All pins except VCC . . . . . . . . . –0.6 V to VCC + 0.6 V
VCC (Note 1). . . . . . . . . . . . . . . . . . . . . –0.6 V to 7.0 V
Note:
1. Minimum DC voltage on input or I/O pins –0.5 V. During
voltage transitions, the input may overshoot VSS to –2.0 V
for periods of up to 20 ns. Maximum DC voltage on input
and I/O pins is VCC + 5 V. During voltage transitions, input
and I/O pins may overshoot to VCC + 2.0 V for periods up
to 20ns.
Stresses above those listed under “Absolute Maximum Rat-
ings” may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these
or any other conditions above those indicated in the opera-
tional sections of this specification is not implied. Exposure of
the device to absolute maximum ratings for extended periods
may affect device reliability.
OPERATING RANGES
Commercial (C) Devices
Ambient Temperature (TA) . . . . . . . . . . .0°C to +70°C
Industrial (I) Devices
Ambient Temperature (TA) . . . . . . . . .–40°C to +85°C
Supply Read Voltages
VCC for ± 5% devices . . . . . . . . . . +4.75 V to +5.25 V
VCC for ± 10% devices . . . . . . . . . +4.50 V to +5.50 V
Operating ranges define those limits between which the func-
tionality of the device is guaranteed.
Am27X256
5
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet AM27X256-90JC.PDF ] |
Número de pieza | Descripción | Fabricantes |
AM27X256-90JC | 256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device | Advanced Micro Devices |
AM27X256-90JI | 256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device | Advanced Micro Devices |
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