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AM28F256A-120FC

AM28F256A-120FC首页预览图
型号: AM28F256A-120FC
PDF文件:
  • AM28F256A-120FC PDF文件
  • AM28F256A-120FC PDF在线浏览
功能描述: 256 Kilobit (32 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms
PDF文件大小: 456.67 Kbytes
PDF页数: 共35页
制造商: AMD[Advanced Micro Devices]
制造商LOGO: AMD[Advanced Micro Devices] LOGO
制造商网址: http://www.amd.com
捡单宝AM28F256A-120FC
PDF页面索引
120%
10 Am28F256A
READ-ONLY MODE
When V
PP
is less than V
CC
+ 2 V, the command register
is inactive. The device can either read array or autose-
lect data, or be standby mode.
Read
The de vice f unctions as a r ead only memory when V
PP
< V
CC
+ 2 V. The de vice has two control functi ons. Both
must be satisfied in order to output data. CE# controls
power to the device. This pin should be used for spe-
cific device selection. OE# controls the device outputs
and should be used to gate data to the output pins if a
device is selected.
Address access time t
AC C
is equal to the delay from
stable addresses to valid output data. The chip enable
access time t
CE
is the dela y from stab le addresses and
stable CE# to valid data at the output pins. The output
enable access time is the dela y from the f alling edge of
OE# to valid data at the output pins (assuming the ad-
dresses have been stable at least t
ACC
- t
OE
).
Standby Mode
The device has two standby modes. The CMOS
standby mode (CE# input held at V
CC
± 0.5 V), con-
sumes less than 100 µA of current. TTL standby mode
(CE# is held at V
IH
) reduces the current requirements
to less than 1 mA. When in the standby mode the out-
puts are in a high impedance state, independent of the
OE# input.
If the device is deselected during erasure, program-
ming, or program/erase verification, the device will
dra w activ e current until the operation is terminated.
Output Disable
Output from the device is disabled when OE# is at a
logic high level. When disabled, output pins are in a
high impedance state.
Auto Select
Flash memories can be programmed in-system or in a
standard PROM programmer. The device may be sol-
dered to the circuit board upon recei pt of shipment and
programmed in-system. Alternatively, the device may
initially be programmed in a PROM programmer prior
to soldering the device to the board.
The Auto select mode allows the reading out of a binary
code from the device that will identify its manufacturer and
type. This mode is intended for the pur pos e of autom ati-
cally matching the de vice to be programmed with its cor-
responding programming algorithm. This mode is
functional ov er the entire temperature range of the device.
Programming In A PROM Programmer
To activate this mode, the programming equipment
must force V
ID
(11.5 V to 13.0 V) on address A9. Two
identifier b ytes may then be sequenced from the de vice
outputs by toggling address A0 from V
IL
to V
IH
. All other
address lines must be held at V
IL
, and V
PP
must be
less than or equal to V
CC
+ 2.0 V while using this Auto
select mode. By te 0 (A0 = V
IL
) represents the man ufac-
turer code and byte 1 (A0 = V
IH
) the device identifier
code. For the de vice the t wo bytes are given in t he table
2 of the device data sheet. All identifiers for manufac-
turer and device codes will exhibit odd parity with the
MSB (DQ7) defined as the parity bit.
Table 2. Am28F256A Auto Select Code
Type A0
Code
(HEX)
Manufacturer Code V
IL
01
Device Code V
IH
2F
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