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부품번호 | 29C256 기능 |
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기능 | 256K 32K x 8 5-volt Only CMOS Flash Memory | ||
제조업체 | ATMEL Corporation | ||
로고 | |||
전체 17 페이지수
Features
• Fast Read Access Time – 70 ns
• 5-volt Only Reprogramming
• Page Program Operation
– Single Cycle Reprogram (Erase and Program)
– Internal Address and Data Latches for 64 Bytes
• Internal Program Control and Timer
• Hardware and Software Data Protection
• Fast Program Cycle Times
– Page (64 Byte) Program Time – 10 ms
– Chip Erase Time – 10 ms
• DATA Polling for End of Program Detection
• Low-power Dissipation
– 50 mA Active Current
– 300 µA CMOS Standby Current
• Typical Endurance > 10,000 Cycles
• Single 5V ± 10% Supply
• CMOS and TTL Compatible Inputs and Outputs
• Commercial and Industrial Temperature Ranges
Description
The AT29C256 is a five-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 70 ns with power dissipation of just 275 mW. When the device is
deselected, the CMOS standby current is less than 300 µA. The device endurance is
such that any sector can typically be written to in excess of 10,000 times.
256K (32K x 8)
5-volt Only
Flash Memory
AT29C256
Pin Configurations
Pin Name
A0 - A14
CE
OE
WE
I/O0 - I/O7
NC
DC
Function
Addresses
Chip Enable
Output Enable
Write Enable
Data Inputs/Outputs
No Connect
Don’t Connect
PLCC and LCC Top View
TSOP Top View
Type 1
OE
A11
A9
A8
A13
A14
VCC
WE
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21 A10
20 CE
19 I/O7
18 I/O6
17 I/O5
16 I/O4
15 I/O3
14 GND
13 I/O2
12 I/O1
11 I/O0
10 A0
9 A1
8 A2
A6 5
A5 6
A4 7
A3 8
A2 9
A1 10
A0 11
NC 12
I/O0 13
29 A8
28 A9
27 A11
26 NC
25 OE
24 A10
23 CE
22 I/O7
21 I/O6
Note: PLCC package pins 1 and 17 are
DON’T CONNECT.
Rev. 0046P–FLASH–10/04
1
PRODUCT IDENTIFICATION: The product identification mode identifies the device
and manufacturer and may be accessed by a hardware operation. For details, see
Operating Modes or Product Identification.
DATA POLLING: The AT29C256 features DATA polling to indicate the end of a pro-
gram cycle. During a program cycle an attempted read of the last byte loaded will result
in the complement of the loaded data on I/O7. Once the program cycle has been com-
pleted, true data is valid on all outputs and the next cycle may begin. DATA polling may
begin at any time during the program cycle.
TOGGLE BIT: In addition to DATA polling the AT29C256 provides another method for
determining the end of a program or erase cycle. During a program or erase operation,
successive attempts to read data from the device will result in I/O6 toggling between
one and zero. Once the program cycle has completed, I/O6 will stop toggling and valid
data will be read. Examining the toggle bit may begin at any time during a program
cycle.
OPTIONAL CHIP ERASE MODE: The entire device can be erased by using a six-byte
software code. Please see Software Chip Erase application note for details.
Absolute Maximum Ratings*
Temperature Under Bias................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
All Input Voltages (including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to VCC + 0.6V
Voltage on OE
with Respect to Ground ...................................-0.6V to +13.5V
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability.
4 AT29C256
0046P–FLASH–10/04
4페이지 Input Test Waveforms and Measurement Level
Output Test Load
tR, tF < 5 ns
AT29C256
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Symbol
Typ
Max
CIN
COUT
Note:
46
8 12
1. This parameter is characterized and is not 100% tested.
Units
pF
pF
Conditions
VIN = 0V
VOUT = 0V
0046P–FLASH–10/04
7
7페이지 | |||
구 성 | 총 17 페이지수 | ||
다운로드 | [ 29C256.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
29C256 | 256K 32K x 8 5-volt Only CMOS Flash Memory | ATMEL Corporation |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |