|
|
PDF Am28F020A Data sheet ( Hoja de datos )
| Número de pieza | Am28F020A | |
| Descripción | 2 Megabit CMOS 12.0 Volt Bulk Erase Flash Memory | |
| Fabricantes | AMD | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de Am28F020A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
FINAL
Am28F020A
2 Megabit (256 K x 8-Bit)
CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms
DISTINCTIVE CHARACTERISTICS
s High performance
— Access times as fast as 70 ns
s CMOS low power consumption
— 30 mA maximum active current
— 100 µA maximum standby current
— No data retention power consumption
s Compatible with JEDEC-standard byte-wide
32-pin EPROM pinouts
— 32-pin PDIP
— 32-pin PLCC
— 32-pin TSOP
s 100,000 write/erase cycles minimum
s Write and erase voltage 12.0 V ±5%
s Latch-up protected to 100 mA from
–1 V to VCC +1 V
s Embedded Erase Electrical Bulk Chip Erase
— Five seconds typical chip erase, including
pre-programming
s Embedded Program
— 14 µs typical byte program, including time-out
— 4 seconds typical chip program
s Command register architecture for
microprocessor/microcontroller compatible
write interface
s On-chip address and data latches
s Advanced CMOS flash memory technology
— Low cost single transistor memory cell
s Embedded algorithms for completely self-timed
write/erase operations
GENERAL DESCRIPTION
The Am28F020A is a 2 Megabit Flash memory orga-
nized as 256 Kbytes of 8 bits each. AMD’s Flash mem-
ories offer the most cost-effective and reliable read/
write non-volatile random access memor y. The
Am28F020A is packaged in 32-pin PDIP, PLCC, and
TSOP versions. It is designed to be reprogrammed and
erased in-system or in standard EPROM programmers.
The Am28F020A is erased when shipped from
the factory.
The standard Am28F020A offers access times of as
fast as 70 ns, allowing high speed microprocessors to
operate without wait states. To eliminate bus conten-
tion, the device has separate chip enable (CE#) and
output enable (OE#) controls.
AMD’s Flash memories augment EPROM functionality
with in-circuit electrical erasure and programming. The
Am28F020A uses a command register to manage this
functionality. The command register allows for 100%
TTL level control inputs and fixed power supply levels
during erase and programming, while maintaining
maximum EPROM compatibility.
The Am28F020A is compatible with the AMD
Am28F256A, Am28F512A, and Am28F010A Flash
memories. All devices in the Am28Fxxx family follow
the JEDEC 32-pin pinout standard. In addition, all
devices within this family that offer Embedded Algo-
rithms use the same command set. This offers
designers the flexibility to retain the same device foot-
print and command set, at any density between
256 Kbits and 2 Mbits.
AMD’s Flash technology reliably stores memory con-
tents even after 100,000 erase and program cycles.
The AMD cell is designed to optimize the erase and
programming mechanisms. In addition, the combina-
tion of advanced tunnel oxide processing and low
internal electric fields for erase and programming oper-
ations produces reliable cycling. The Am28F020A uses
a 12.0±5% VPP supply input to perform the erase and
programming functions.
The highest degree of latch-up protection is achieved
with AMD’s proprietary non-epi process. Latch-up pro-
tection is provided for stresses up to 100 mA on
address and data pins from –1 V to VCC +1 V.
AMD’s Flash technology combines years of EPROM
and EEPROM experience to produce the highest levels
of quality, reliability, and cost effectiveness. The
Am28F020A electrically erases all bits simultaneously
using Fowler-Nordheim tunneling. The bytes are
programmed one byte at a time using the EPROM
programming mechanism of hot electron injection.
Publication# 17502 Rev: D Amendment/+1
Issue Date: January 1998
1 page  
CONNECTION DIAGRAMS (Continued)
A11
A9
A8
A13
A14
A17
WE#
VCC
VPP
A16
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32-Pin TSOP—Standard Pinout
OE#
A10
CE#
D7
D6
D5
D4
D3
VSS
D2
D1
D0
A0
A1
A2
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32-Pin TSOP—Reverse Pinout
LOGIC SYMBOL
32 OE#
31 A10
30 CE#
29 D7
28 D6
27 D5
26 D4
25 D3
24 VSS
23 D2
22 D1
21 D0
20 A0
19 A1
18 A2
17 A3
32 A11
31 A9
30 A8
29 A13
28 A14
27 A17
26 WE#
25 VCC
24 VPP
23 A16
22 A15
21 A12
20 A7
19 A6
18 A5
17 A4
18
A0–A17
DQ0–DQ7
CE# (E#)
OE# (G#)
WE# (W#)
8
17502D-4
17502D-5
Am28F020A
5
5 Page 
ERASE, PROGRAM, AND READ MODE
When VPP is equal to 12.0 V ± 5%, the command reg-
ister is active. All functions are available. That is, the
device can program, erase, read array or autoselect
data, or be standby mode.
Write Operations
High voltage must be applied to the VPP pin in order to
activate the command register. Data written to the reg-
ister serves as input to the internal state machine. The
output of the state machine determines the operational
function of the device.
The command register does not occupy an address-
able memory location. The register is a latch that stores
the command, along with the address and data infor-
mation needed to execute the command. The register
is written by bringing WE# and CE# to VIL, while OE#
is at VIH. Addresses are latched on the falling edge of
WE#, while data is latched on the rising edge of the
WE# pulse. Standard microprocessor write timings are
used.
The device requires the OE# pin to be VIH for write op-
erations. This condition eliminates the possibility for
bus contention during programming operations. In
order to write, OE# must be VIH, and CE# and WE#
must be VIL. If any pin is not in the correct state a write
command will not be executed.
Refer to AC Write Characteristics and the Erase/Pro-
gramming Waveforms for specific timing parameters.
Command Definitions
The contents of the command register default to 00h
(Read Mode) in the absence of high voltage applied to
the VPP pin. The device operates as a read only
memory. High voltage on the VPP pin enables the
command register. Device operations are selected by
writing specific data codes into the command register.
Table 3 in the device data sheet defines these register
commands.
Read Command
Memory contents can be accessed via the read com-
mand when VPP is high. To read from the device, write
00h into the command register. Standard microproces-
sor read cycles access data from the memory. The de-
vice will remain in the read mode until the command
register contents are altered.
The command register defaults to 00h (read mode)
upon VPP power-up. The 00h (Read Mode) register de-
fault helps ensure that inadvertent alteration of the
memory contents does not occur during the VPP power
transition. Refer to the AC Read Characteristics and
Waveforms for the specific timing parameters.
Table 3. Am28F020A Command Definitions
Command
First Bus Cycle
Operation
(Note 1)
Address
(Note 2)
Data
(Note 3)
Second Bus Cycle
Operation
(Note 1)
Address
Note 2)
Data
(Note 3)
Read Memory (Note 4)
Read Auto select
Embedded Erase Set-up/
Embedded Erase
Embedded Program Set-up/
Embedded Program
Reset (Note 4)
Write
Write
Write
Write
Write
X
00h/FFh
Read
RA
RD
X
80h or 90h
Read
00h/01h
01h/29h
X
30h Write
X
30h
X
10h or 50h
Write
X
00h/FFh
Write
PA PD
X 00h/FFh
Notes:
1. Bus operations are defined in Table 1.
2. RA = Address of the memory location to be read.
PA = Address of the memory location to be programmed.
Addresses are latched on the falling edge of the WE# pulse.
X = Don’t care.
3. RD = Data read from location RA during read operation.
PD = Data to be programmed at location PA. Data latched on the rising edge of WE#.
4. Please reference Reset Command section.
Am28F020A
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet Am28F020A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| Am28F020 | 2 Megabit CMOS 12.0 Volt Bulk Erase Flash Memory | AMD |
| Am28F020A | 2 Megabit CMOS 12.0 Volt Bulk Erase Flash Memory | AMD |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |