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AT27C256R 데이터시트 PDF




ATMEL Corporation에서 제조한 전자 부품 AT27C256R은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 AT27C256R 자료 제공

부품번호 AT27C256R 기능
기능 256K 32K x 8 OTP CMOS EPROM
제조업체 ATMEL Corporation
로고 ATMEL Corporation 로고


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AT27C256R 데이터시트, 핀배열, 회로
Features
Fast read access time – 45ns
Low-power CMOS operation
– 100µA max standby
– 20mA max active at 5MHz
JEDEC standard packages
– 28-lead PDIP
– 32-lead PLCC
5V±10% supply
High reliability CMOS technology
– 2,000V ESD protection
– 200mA latchup immunity
Rapid programming algorithm – 100µs/byte (typical)
CMOS- and TTL-compatible inputs and outputs
Integrated product identification code
Industrial and automotive temperature ranges
Green (Pb/halide-free) packaging option
256K (32K x 8)
One-time
Programmable,
Read-only Memory
Atmel AT27C256R
1. Description
The Atmel® AT27C256R is a low-power, high-performance, 262,144-bit, one-time pro-
grammable, read-only memory (OTP EPROM) organized as 32K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed in less than
45ns, eliminating the need for speed reducing WAIT states on high-performance micropro-
cessor systems.
The Atmel scaled CMOS technology provides low active power consumption and fast pro-
gramming. Power consumption is typically only 8mA in active mode and less than 10µA in
standby mode.
The AT27C256R is available in a choice of industry-standard, JEDEC-approved, one-time
programmable (OTP) PDIP and PLCC packages. All devices 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.
The AT27C256R has additional features to ensure high quality and efficient production use.
The rapid programming algorithm reduces the time required to program the part and guar-
antees reliable programming. Programming time is typically only 100µs/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 pro-
gramming algorithms and voltages.
0014O–EPROM–10/11




AT27C256R pdf, 반도체, 판매, 대치품
Table 5-3. DC and operating characteristics for read operation
Symbol Parameter
Condition
Min Max Units
ILI Input load current
VIN = 0V to VCC
Ind.
Auto.
±1 µA
±5 µA
ILO
Output leakage current
VOUT = 0V to VCC
Ind.
Auto.
±5 µA
±10 µA
IPP1(2)
VPP(1) read/standby current VPP = VCC
10 µA
ISB
VCC(1) standby current
ISB1 (CMOS), CE = VCC 0.3V
ISB2 (TTL), CE = 2.0 to VCC + 0.5V
100 µA
1 mA
ICC VCC active current
f = 5MHz, IOUT = 0mA, E = VIL
20 mA
VIL Input low voltage
-0.6 0.8
V
VIH Input high voltage
2.0 VCC + 0.5
V
VOL Output low voltage
IOL = 2.1mA
0.4 V
VOH Output high voltage
IOH = -400µA
2.4 V
Notes:
1. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP.
2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and
IPP.
Table 5-4. AC characteristics for read operation
Symbol
Parameter
Condition
tACC(1)
tCE(1)
tOE(1)
tDF(1)
tOH
Address to output delay
CE = OE = VIL
CE to output delay
OE = VIL
OE to output delay
CE = VIL
OE or CE high to output float, whichever occurred first
Output hold from address, CE or OE, whichever occurred
first
Note: 1. See AC waveforms for read operation.
Atmel AT27C256R
-45 -70
Min Max Min Max
45 70
45 70
20 30
20 25
77
Units
ns
ns
ns
ns
ns
4 Atmel AT27C256R
0014O–EPROM–10/11

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AT27C256R 전자부품, 판매, 대치품
Atmel AT27C256R
Table 5-6. DC programming characteristics
TA = 25 5°C, VCC = 6.5 0.25V, VPP = 13.0 0.25V
Symbol
ILI
VIL
VIH
VOL
VOH
ICC2
IPP2
VID
Parameter
Input load current
Input low level
Input high level
Output low volt
Output high volt
VCC supply current (program and verify)
VPP current
A9 product identification voltage
Test Conditions
VIN = VIL,VIH
IOL = 2.1mA
IOH = -400µA
CE = VIL
Limits
Min Max
±10
-0.6 0.8
2.0 VCC + 1
0.4
2.4
25
25
11.5 12.5
Units
µA
V
V
V
V
mA
mA
V
Table 5-7. AC programming characteristics
TA = 25 5°C, VCC = 6.5 0.25V, VPP = 13.0 0.25V
Symbol Parameter
Test conditions(1)
Limits
Min Max
Units
tAS
tOES
tDS
tAH
tDH
tDFP
tVPS
tVCS
tPW
tOE
tPRT
Notes:
Address setup time
2 µs
OE setup time
Data setup time
Input rise and fall times
(10% to 90%) 20ns
2
2
µs
µs
Address hold time
Data hold time
OE high to output float delay(2)
VPP setup time
VCC setup time
CE program pulse width(3)
Data valid from OE(2)
Input pulse levels
0.45V to 2.4V
Input timing reference level
0.8V to 2.0V
Output timing reference level
0.8V to 2.0V
0 µs
2 µs
0 130 ns
2 µs
2 µs
95 105 µs
150 ns
VPP pulse rise time during programming
50 ns
1. VCC must be applied simultaneously with or before VPP and removed simultaneously with or after VPP.
2. This parameter is only sampled, and is not 100% tested. Output float is defined as the point where data is no longer driven.
See timing diagram.
3. Program pulse width tolerance is 100µs 5%.
Table 5-8. The Atmel AT27C256R integrated product identification code
Codes
Manufacturer
Device type
Pins
A0 O7 O6 O5 O4 O3 O2 O1 O0
000011110
110001100
Hex
data
1E
8C
0014O–EPROM–10/11
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관련 데이터시트

부품번호상세설명 및 기능제조사
AT27C256

256K 32K x 8 OTP CMOS EPROM

ATMEL Corporation
ATMEL Corporation
AT27C256R

256K 32K x 8 OTP CMOS EPROM

ATMEL Corporation
ATMEL Corporation

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