数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

AM27C256-120DIB 数据表(PDF) 5 Page - Advanced Micro Devices

部件名 AM27C256-120DIB
功能描述  256 Kilobit (32 K x 8-Bit) CMOS EPRO
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM27C256-120DIB 数据表(HTML) 5 Page - Advanced Micro Devices

  AM27C256-120DIB Datasheet HTML 1Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 2Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 3Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 4Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 5Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 6Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 7Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 8Page - Advanced Micro Devices AM27C256-120DIB Datasheet HTML 9Page - Advanced Micro Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 12 page
background image
Am27C256
5
FUNCTIONAL DESCRIPTION
Device Erasure
In order to clear all locations of their programmed con-
tents, the device must be exposed to an ultraviolet light
source. A dosage of 15 W seconds/cm2 is required to
completely erase the device. This dosage can be ob-
tained by exposure to an ultraviolet lamp—wavelength
of 2537 Å—with intensity of 12,000 µW/cm2 for 15 to 20
minutes. The device should be directly under and about
one inch from the source, and all filters should be re-
moved from the UV light source prior to erasure.
Note that all UV erasable devices will erase with light
sources having wavelengths shorter than 4000 Å, such
as fluorescent light and sunlight. Although the erasure
process happens over a much longer time period, ex-
posure to any light source should be prevented for
maximum system reliability. Simply cover the package
window with an opaque label or substance.
Device Programming
Upon delivery, or after each erasure, the device has
all of its bits in the “ONE”, or HIGH state. “ZEROs” are
loaded into the device through the programming pro-
cedure.
The device enters the programming mode when 12.75
V
± 0.25 V is applied to the V
PP pin, OE# is at VIH and
CE# is at VIL.
For programming, the data to be programmed is ap-
plied 8 bits in parallel to the data pins.
The flowchar t in the Programming section of the
EPROM Products Data Book (Section 5, Figure 5-1)
shows AMD’s Flashrite algorithm. The Flashrite algo-
rithm reduces programming time by using a 100 µs pro-
gramming pulse and by giving each address only as
many pulses to reliably program the data. After each
pulse is applied to a given address, the data in that ad-
dress is verified. If the data does not verify, additional
pulses are given until it verifies or the maximum pulses
allowed is reached. This process is repeated while se-
quencing through each address of the device. This part
of the algorithm is done at VCC = 6.25 V to assure that
each EPROM bit is programmed to a sufficiently high
threshold voltage. After the final address is completed,
the entire EPROM memory is verified at VCC = VPP =
5.25 V.
Please refer to Section 5 of the EPROM Products Data
Book for additional programming information and spec-
ifications.
Program Inhibit
Programming different data to multiple devices in par-
allel is easily accomplished. Except for CE#, all like in-
puts of the devices may be common. A TTL low-level
program pulse applied to one device’s CE# input with
VPP = 12.75 V ± 0.25 V and OE# HIGH will program
that particular device. A high-level CE# input inhibits
the other devices from being programmed.
Program Verify
A verification should be performed on the programmed
bits to determine that they were correctly programmed.
The verify should be performed with OE# at VIL, CE# at
VIH, and VPP between 12.5 V and 13.0 V.
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification through identifier codes on DQ0–
DQ7. This mode is primarily intended for programming
equipment to automatically match a device to be pro-
grammed with its corresponding programming algo-
rithm. This mode is functional in the 25
°C ± 5°C
ambient temperature range that is required when pro-
gramming the device.
To activate this mode, the programming equipment
must force VH on address line A9. Two identifier bytes
may then be sequenced from the device outputs by tog-
gling address line A0 from VIL to VIH (that is, changing
the address from 00h to 01h). All other address lines
must be held at VIL during the autoselect mode.
Byte 0 (A0 = VIL) represents the manufacturer code,
and Byte 1 (A0 = VIH), the device identifier code. Both
codes have odd parity, with DQ7 as the parity bit.
Read Mode
To obtain data at the device outputs, Chip Enable (CE#)
and Output Enable (OE#) must be driven low. CE# con-
trols the power to the device and is typically used to se-
lect the device. OE# enables the device to output data,
independent of device selection. Addresses must be
stable for at least tACC–tOE. Refer to the Switching
Waveforms section for the timing diagram.
Standby Mode
The device enters the CMOS standby mode when CE#
is at VCC ± 0.3 V. Maximum VCC current is reduced to
100 µA. The device enters the TTL-standby mode
when CE# is at VIH. Maximum VCC current is reduced
to 1.0 mA. When in either standby mode, the device
places its outputs in a high-impedance state, indepen-
dent of the OE# input.
Output OR-Tieing
To accommodate multiple memory connections, a
two-line control function provides:
s Low memory power dissipation, and
s Assurance that output bus contention will not occur.
CE# should be decoded and used as the primary de-
vice-selecting function, while OE# be made a common


类似零件编号 - AM27C256-120DIB

制造商部件名数据表功能描述
logo
Advanced Micro Devices
AM27C256-120 AMD-AM27C256-120 Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
AM27C256-120EC AMD-AM27C256-120EC Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
AM27C256-120EI AMD-AM27C256-120EI Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
AM27C256-120JC AMD-AM27C256-120JC Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
AM27C256-120JI AMD-AM27C256-120JI Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
More results

类似说明 - AM27C256-120DIB

制造商部件名数据表功能描述
logo
Advanced Micro Devices
AM27X256 AMD-AM27X256 Datasheet
139Kb / 10P
   256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device
AM28F256 AMD-AM28F256 Datasheet
493Kb / 35P
   256 Kilobit (32 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory
AMD27C256 AMD-AMD27C256 Datasheet
90Kb / 12P
   256 Kilobit (32,768 x 8-Bit) CMOS EPROM
AM27C64 AMD-AM27C64 Datasheet
172Kb / 12P
   64 Kilobit (8 K x 8-Bit) CMOS EPROM
AM28F256A AMD-AM28F256A Datasheet
456Kb / 35P
   256 Kilobit (32 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms
AM27C512 AMD-AM27C512 Datasheet
168Kb / 12P
   512 Kilobit (64 K x 8-Bit) CMOS EPROM
AM27X64 AMD-AM27X64 Datasheet
139Kb / 10P
   64 Kilobit (8 K x 8-Bit) CMOS ExpressROM Device
AM27X128 AMD-AM27X128 Datasheet
139Kb / 10P
   128 Kilobit (16 K x 8-Bit) CMOS ExpressROM Device
logo
Hitachi Semiconductor
HN58S256A HITACHI-HN58S256A Datasheet
88Kb / 17P
   256 k EEPROM (32-kword x 8-bit)
logo
Fujitsu Component Limit...
MB85R256H FUJITSU-MB85R256H Datasheet
277Kb / 14P
   Memory FRAM CMOS 256 K (32 K 횞 8) Bit
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com