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AM28F020A-70JIB

更新时间: 2024-01-12 09:06:10
品牌 Logo 应用领域
超微 - AMD 闪存
页数 文件大小 规格书
35页 444K
描述
2 Megabit (256 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms

AM28F020A-70JIB 数据手册

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FINAL  
Am28F020A  
2 Megabit (256 K x 8-Bit)  
CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms  
Latch-up protected to 100 mA from  
–1 V to VCC +1 V  
DISTINCTIVE CHARACTERISTICS  
High performance  
Embedded Erase Electrical Bulk Chip Erase  
— Access times as fast as 70 ns  
CMOS low power consumption  
— 30 mA maximum active current  
— 100 µA maximum standby current  
— No data retention power consumption  
— Five seconds typical chip erase, including  
pre-programming  
Embedded Program  
— 14 µs typical byte program, including time-out  
— 4 seconds typical chip program  
Compatible with JEDEC-standard byte-wide  
32-pin EPROM pinouts  
Command register architecture for  
microprocessor/microcontroller compatible  
write interface  
— 32-pin PDIP  
— 32-pin PLCC  
On-chip address and data latches  
— 32-pin TSOP  
Advanced CMOS flash memory technology  
— Low cost single transistor memory cell  
100,000 write/erase cycles minimum  
±
Write and erase voltage 12.0 V 5%  
Embedded algorithms for completely self-timed  
write/erase operations  
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.  
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 memory. 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.  
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 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.  
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 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.  
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.  
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  
Publication# 17502 Rev: D Amendment/+1  
Issue Date: January 1998  

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