AT27C256R-55PI 반도체 회로 부품 판매점
256K 32K x 8 OTP CMOS EPROM
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 ATMEL Corporation |
AT27C256R
Features
Fast Read Access Time - 45 ns
•• Low Power CMOS Operation
100 µA max. Standby
20 mA max. Active at 5 MHz
• JEDEC Standard Packages
28-Lead 600-mil PDIP
32-Lead PLCC
28-Lead TSOP and SOIC
• 5V ± 10% Supply
• High Reliability CMOS Technology
2,000V ESD Protection
200 mA Latchup Immunity
• Rapid™ Programming Algorithm - 100 µs/byte (typical)
CMOS and TTL Compatible Inputs and Outputs
• Integrated Product Identification Code
•• Commercial and Industrial Temperature Ranges
Description
The AT27C256R is a low-power, high performance 262,144 bit one-time programma-
ble read only memory (OTP EPROM) organized 32K by 8 bits. It requires only one
5V power supply in normal read mode operation. Any byte can be accessed in less
than 45 ns, eliminating the need for speed reducing WAIT states on high performance
microprocessor systems.
Atmel’s scaled CMOS technology provides low active power consumption, and fast
programming. Power consumption is typically only 8 mA in Active Mode and less
than 10 µA in Standby.
(continued)
256K (32K x 8)
OTP
CMOS
EPROM
Pin Configurations
Pin Name Function
A0 - A14 Addresses
O0 - O7 Outputs
CE Chip Enable
OE Output Enable
NC No Connect
PDIP, SOIC Top View
AT27C256R
PLCC Top View
TSOP Top View
Type 1
Note: PLCC Package Pins 1 and
17 are DON’T CONNECT.
0014G
3-125
Description (Continued)
The AT27C256R is available in a choice of industry stand-
ard JEDEC-approved one time programmable (OTP)
plastic DIP, PLCC, SOIC, and TSOP packages. All de-
vices feature two-line control (CE, OE) to give designers
the flexibility to prevent bus contention.
With 32K byte storage capability, the AT27C256R allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.
Atmel’s 27C256R has additional features to ensure high
quality and efficient production use. The Rapid™ Program-
ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 100 µs/byte. The Integrated Product
Identification Code electronically identifies the device and
manufacturer. This feature is used by industry standard
programming equipment to select the proper program-
ming algorithms and voltages.
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may produce transient voltage excur-
sions. Unless accommodated by the system design, these
transients may exceed data sheet limits, resulting in de-
vice non-conformance. At a minimum, a 0.1 µF high fre-
quency, low inherent inductance, ceramic capacitor
should be utilized for each device. This capacitor should
be connected between the VCC and Ground terminals of
the device, as close to the device as possible. Additionally,
to stabilize the supply voltage level on printed circuit
boards with large EPROM arrays, a 4.7 µF bulk electrolytic
capacitor should be utilized, again connected between the
VCC and Ground terminals. This capacitor should be posi-
tioned as close as possible to the point where the power
supply is connected to the array.
3-126 AT27C256R
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제조업체: ATMEL Corporation
( atmel )
AT27C256R-55PI cmos
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
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관련 데이터시트
AT27C256R-55PC
256K 32K x 8 OTP CMOS EPROM - ATMEL Corporation
AT27C256R-55PI
256K 32K x 8 OTP CMOS EPROM - ATMEL Corporation