AT27C256R-55RIT/R [ATMEL]
OTP ROM, 32KX8, 55ns, CMOS, PDSO28, 0.330 INCH, PLASTIC, SOIC-28;
| 型号： | AT27C256R-55RIT/R |
| 厂家： | 
ATMEL |
| 描述： | OTP ROM, 32KX8, 55ns, CMOS, PDSO28, 0.330 INCH, PLASTIC, SOIC-28 可编程只读存储器 电动程控只读存储器 |
| 文件： | 总9页 (文件大小：254K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
•
256K (32K x 8)
OTP
CMOS
•
•
•
Integrated Product Identification Code
Commercial and Industrial Temperature Ranges
•
EPROM
•
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)
Pin Configurations
PDIP, SOIC Top View
Pin Name Function
AT27C256R
A0 - A14
O0 - O7
CE
Addresses
Outputs
Chip Enable
Output Enable
No Connect
OE
NC
PLCC Top View
TSOP Top View
Type 1
Note: PLCC Package Pins 1 and
17 are DON’T CONNECT.
0014G
3-125
System Considerations
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.
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
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.
be connected between the V and Ground terminals of
CC
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
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.
V
and Ground terminals. This capacitor should be posi-
CC
tioned as close as possible to the point where the power
supply is connected to the array.
3-126
AT27C256R
AT27C256R
Absolute Maximum Ratings*
Block Diagram
Temperature Under Bias ................ -55°C to +125°C
Storage Temperature...................... -65°C to +150°C
Voltage on Any Pin with
(1)
Respect to Ground.........................-2.0V to +7.0V
Voltage on A9 with
Respect to Ground ...................... -2.0V to +14.0V
(1)
V
Supply Voltage with
PP
(1)
Respect to Ground.......................-2.0V to +14.0V
*NOTICE: Stresses beyond those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at these or any other conditions beyond those indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
Note: 1. Minimum voltage is -0.6V dc which may undershoot
to -2.0V for pulses of less than 20 ns. Maximum out-
put pin voltage is VCC + 0.75V dc which may over-
shoot to +7.0V for pulses of less than 20 ns.
Operating Modes
CE
OE
Ai
Ai
X
V
Mode \ Pin
Read
Outputs
PP
CC
CC
CC
V
V
V
IL
V
V
V
D
OUT
IL
(1)
(1)
Output Disable
Standby
V
High Z
High Z
IL
IH
(1)
V
IH
X
X
(2)
Rapid Program
V
V
Ai
Ai
Ai
V
V
D
D
D
IL
(1)
IH
PP
PP
CC
IN
(2)
PGM Verify
X
V
V
IL
IL
IH
OUT
OUT
(2)
Optional PGM Verify
V
V
IL
(1)
(2)
PGM Inhibit
V
IH
V
X
V
High Z
PP
(3)
A9 = V
H
Identification
Code
(4)
Product Identification
V
V
IL
A0 = V or V
A1 - A14 = V
V
IL
IH
IL
IL
CC
Notes: 1. X can be VIL or VIH.
4. Two identifier bytes may be selected. All Ai inputs
are held low (VIL), except A9 which is set to VH and A0
which is toggled low (VIL) to select the Manufacturer’s Identi-
fication byte and high (VIH) to select the Device Code byte.
2. Refer to Programming characteristics.
3. VH = 12.0 ± 0.5V.
3-127
DC and AC Operating Conditions for Read Operation
AT27C256R
-45
-55
-70
-90
-12
-15
Com. 0°C - 70°C
0°C - 70°C
0°C - 70°C
0°C - 70°C
0°C - 70°C
0°C - 70°C
Operating
Temp. (Case)
Ind. -40°C - 85°C -40°C - 85°C -40°C - 85°C -40°C - 85°C
5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
-40°C - 85°C -40°C - 85°C
V
Supply
5V ± 10%
5V ± 10%
CC
DC and Operating Characteristics for Read Operation
Symbol Parameter
Condition
Min
Max
Units
I
I
I
Input Load Current
V
= 0V to V
CC
±1
±5
10
100
1
µA
µA
µA
µA
mA
LI
IN
Output Leakage Current
V
OUT
= 0V to V
CC
LO
PP1
(2)
(1)
V
Read/Standby Current V = V
PP CC
PP
I
I
(CMOS), CE = V ± 0.3V
CC
SB1
SB2
(1)
I
V
Standby Current
SB
CC
CC
(TTL), CE = 2.0 to V + 0.5V
CC
f = 5 MHz, I
CE = V
= 0 mA,
OUT
I
V
Active Current
20
mA
CC
IL
V
V
V
V
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
-0.6
2.0
0.8
V
V
V
V
IL
V
+ 0.5
IH
CC
I
= 2.1 mA
0.4
OL
OH
OL
I
= -400 µA
2.4
OH
Notes: 1. VCC must be applied simultaneously or before VPP
,
2. VPP may be connected directly to VCC, except during program-
and removed simultaneously or after VPP
.
ming. The supply current would then be the sum of ICC and IPP.
AC Characteristics for Read Operation
AT27C256R
-45
-55
-70
-90
-12
-15
Min Max Min Max Min Max Min Max Min Max Min Max
Symbol
Parameter
Condition
Units
150 ns
150 ns
Address to
Output Delay
CE = OE
= VIL
(3)
t
45
55
70
90
120
ACC
(2)
CE to Output Delay OE = VIL
OE to Output Delay CE = VIL
t
t
45
20
55
25
70
30
90
30
120
35
CE
(2, 3)
(4, 5)
40
35
ns
ns
OE
OE or CE High to
Output Float, whichever occurred first
t
t
20
20
25
25
30
DF
Output Hold from
Address, CE or OE,
whichever occurred first
7
7
7
0
0
0
ns
OH
Notes:
2, 3, 4, 5. - see AC Waveforms for Read Operation.
3-128
AT27C256R
AT27C256R
AC Waveforms for Read Operation (1)
Notes: 1. Timing measurement reference level is 1.5V for -45
and -55 devices. Input AC drive levels are VIL =
3. OE may be delayed up to tACC - tOE after the address is valid
without impact on tACC
.
0.0V and VIH = 3.0V. Timing measurement refer-
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer
driven.
ence levels for all other speed grades are VOL
=
0.8V and VOH = 2.0V. Input AC drive levels are VIL
= 0.45V and VIH = 2.4V.
2. OE may be delayed up to tCE - tOE after the falling
edge of CE without impact on tCE
.
Input Test Waveforms and Measurement Levels
Output Test Load
For -45 and -55 devices only:
tR, tF < 5 ns (10% to 90%)
For -70, -90, -12, and -15 devices:
Note:
CL= 100 pF including jig
capacitance, except for
the -45 and -55 devices,
where CL= 30 pF.
tR, tF < 20 ns (10% to 90%)
Pin Capacitance (f = 1MHz, T = 25°C) (1)
Typ
4
Max
6
Units
pF
Conditions
C
C
V
V
= 0V
IN
IN
8
12
pF
= 0V
OUT
OUT
Note: 1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
3-129
Programming Waveforms (1)
Notes: 1. The Input Timing Reference is 0.8V for VIL and
2.0V for VIH.
3. When programming the AT27C256R a 0.1 µF capacitor is
required across VPP and ground to suppress spurious voltage
transients.
2. tOE and tDFP are characteristics of the device but
must be accommodated by the programmer.
DC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Test
Limits
Symbol
Parameter
Conditions
Min
Units
µA
V
Max
Input Load Current
Input Low Level
Input High Level
Output Low Volt.
Output High Volt.
VIN = VIL,VIH
±10
I
LI
-0.6
2.0
0.8
V
V
V
V
IL
VCC + 1
0.4
V
IH
IOL = 2.1 mA
V
OL
OH
IOH = -400 µA
2.4
V
VCC Supply Current
(Program and Verify)
25
mA
I
CC2
PP2
VPP Current
CE = VIL
25
mA
V
I
A9 Product Identification Voltage
11.5
12.5
V
ID
3-130
AT27C256R
AT27C256R
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Rapid Programming Algorithm
A 100 µs CE pulse width is used to program. The address
is set to the first location. V is raised to 6.5V and V is
CC
PP
raised to 13.0V. Each address is first programmed with
one 100 µs CE pulse without verification. Then a verifica-
tion/reprogramming loop is executed for each address. In
the event a byte fails to pass verification, up to 10 succes-
sive 100 µs pulses are applied with a verification after
each pulse. If the byte fails to verify after 10 pulses have
been applied, the part is considered failed. After the byte
verifies properly, the next address is selected until all have
Sym-
bol
Test
Conditions*
Limits
Min Max
(1)
Parameter
Units
µs
Address Setup Time
OE Setup Time
2
2
t
t
AS
µs
OES
Data Setup
Time
2
µs
t
DS
Address Hold Time
Data Hold Time
0
2
µs
µs
t
t
AH
been checked. V is then lowered to 5.0V and V
to
PP
CC
DH
5.0V. All bytes are read again and compared with the origi-
nal data to determine if the device passes or fails.
OE High to Out-
0
2
130
ns
µs
µs
µs
ns
ns
put Float Delay (2)
t
t
t
t
t
t
DFP
VPS
VCS
PW
VPP Setup
Time
VCC Setup
Time
2
CE Program
95
105
150
Pulse Width (3)
Data
Valid from OE (2)
OE
VPP Pulse Rise Time During
Programming
50
PRT
*AC Conditions of Test:
Input Rise and Fall Times (10% to 90%)..............20 ns
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
Notes: 1. VCC must be applied simultaneously or before VPP
and removed simultaneously 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 100 µsec ± 5%.
Atmel’s 27C256R Integrated
Product Identification Code
Pins
Hex
Codes
Data
A0 O7 O6 O5 O4 O3 O2 O1 O0
Manufacturer
Device Type
0
1
0
1
0
0
0
0
1
0
1
1
1
1
1
0
0
0
1E
8C
3-131
Ordering Information
t
I
(mA)
ACC
CC
Ordering Code
Package
Operation Range
(ns)
Active
Standby
45
20
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
AT27C256R-45JC
AT27C256R-45PC
AT27C256R-45RC
AT27C256R-45TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
20
20
20
20
20
20
20
20
20
AT27C256R-45JI
AT27C256R-45PI
AT27C256R-45RI
AT27C256R-45TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
55
AT27C256R-55JC
AT27C256R-55PC
AT27C256R-55RC
AT27C256R-55TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
AT27C256R-55JI
AT27C256R-55PI
AT27C256R-55RI
AT27C256R-55TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
70
AT27C256R-70JC
AT27C256R-70PC
AT27C256R-70RC
AT27C256R-70TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
AT27C256R-70JI
AT27C256R-70PI
AT27C256R-70RI
AT27C256R-70TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
90
AT27C256R-90JC
AT27C256R-90PC
AT27C256R-90RC
AT27C256R-90TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
AT27C256R-90JI
AT27C256R-90PI
AT27C256R-90RI
AT27C256R-90TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
120
AT27C256R-12JC
AT27C256R-12PC
AT27C256R-12RC
AT27C256R-12TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
AT27C256R-12JI
AT27C256R-12PI
AT27C256R-12RI
AT27C256R-12TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
(continued)
3-132
AT27C256R
AT27C256R
Ordering Information (Continued)
t
I
(mA)
ACC
CC
Ordering Code
Package
Operation Range
(ns)
Active
Standby
150
20
0.1
AT27C256R-15JC
AT27C256R-15PC
AT27C256R-15RC
AT27C256R-15TC
32J
Commercial
(0°C to 70°C)
28P6
28R
28T
20
0.1
AT27C256R-15JI
AT27C256R-15PI
AT27C256R-15RI
AT27C256R-15TI
32J
Industrial
(-40°C to 85°C)
28P6
28R
28T
Package Type
32J
32 Lead, Plastic J-Leaded Chip Carrier (PLCC)
28P6
28R
28T
28 Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
28 Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC)
28 Lead, Plastic Thin Small Outline Package (TSOP)
3-133
相关型号：
©2020 ICPDF网 联系我们和版权申明