Datasheet AT27C256R-90TI, AT27C256R-90TC, AT27C256R-90RI, AT27C256R-70PC, AT27C256R-70JI Datasheet (ATMEL)
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AT27C256R
Description
The AT27C256R is a low-power, high performance 262,144 bit one-time programmable 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
Features
•
Fast Read Access Ti me - 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 Techn ol og y
2,000V ESD Protection
200 mA Latchup Immunity
•
RapidProgramming Algorithm - 100 µs/byte (typical)
•
CMOS and TTL Compatible Inputs and Outputs
•
Integrated Product I de nti fic ation Code
•
Commercial and Industrial Temperature Ranges
Pin Configurations
Pin Name Function
A0 - A14 Addresses
O0 - O7 Outputs
CE Chip Enable
OE Output Enable
NC No Connect
PDIP, SOIC Top View
Note: PLCC Package Pins 1 and
17 are DON’T CONNECT.
PLCC Top View
TSOP Top View
Type 1
0014G
AT27C256R
3-125
The AT27C256R is available in a choice of industry standard JEDEC-approved one time programmable (OTP)
plastic DIP, PLCC, SOIC, and TSOP 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.
Atmel’s 27C256R has additional features to ensure high
quality and efficient production use. The Rapid
Programming 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 pr oper programming algorithms and voltages.
Description (Continued)
Switching between active and standby conditions via the
Chip Enable pin ma y produce transient voltage excursions. Unless accommodated by the system design, these
transients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF high frequency, low inherent inductance, ceramic capacitor
should be utilized for each device. This capacitor should
be connected between the V
CC
and Ground terminals of
the device, as close to the device as possible. Additionally,
to stabilize th e 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
V
CC
and Ground terminals. This capacitor should be positioned as close as possible to the point where the power
supply is connected to the array.
System Considerations
3-126 AT27C256R
Block Diagram
Temperature Under Bias ................ -55°C to +125°C
Storage Temperature...................... -65°C to +150°C
Voltage on Any Pin with
Respect to Ground.........................-2.0V to +7.0V
(1)
Voltage on A9 with
Respect to Ground ......................-2.0V to +14.0V
(1)
VPP Supply Voltage with
Respect to Ground.......................-2.0V to +14.0V
(1)
*NOTICE: Stresses beyond those listed under “Abso lu te Max i-
mum Ratings” may cause permanent da mage to th e de vi ce .
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.
Note: 1. Minimum voltage is -0.6V dc which may undershoot
to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is V
CC
+ 0.75V dc which may over-
shoot to +7.0V for pulses of less than 20 ns.
Absolute Maximum Ratings*
Operating Modes
Mode \ Pin
CE OE Ai V
PP
Outputs
Read V
IL
V
IL
Ai V
CC
D
OUT
Output Disable V
IL
V
IH
X
(1)
V
CC
High Z
Standby V
IH
X
(1)
X
(1)
V
CC
High Z
Rapid Program
(2)
V
IL
V
IH
Ai V
PP
D
IN
PGM Verify
(2)
X
(1)
V
IL
Ai V
PP
D
OUT
Optional PGM Verify
(2)
V
IL
V
IL
Ai V
CC
D
OUT
PGM Inhibit
(2)
V
IH
V
IH
X
(1)
V
PP
High Z
Product Identification
(4)
V
IL
V
IL
A9 = VH
(3)
A0 = VIH or VIL
A1 - A14 = V
IL
V
CC
Identification
Code
Notes: 1. X can be VIL or VIH.
2. Refer to Programming characteristics.
3. V
H
= 12.0 ± 0.5V.
4. Two identifier by tes may be selecte d. All Ai inputs
are held low (V
IL
), except A9 wh ich is set to VH and A0
which is toggled low (V
IL
) to select the Manufacturer’s Identi-
fication byte and high (V
IH
) to select the Dev ice Code byte.
AT27C256R
3-127
AC Characteristics for Read Operation
AT27C256R
-45 -55 -70 -90 -12
-15
Symbol Parameter Condition
Min Max Min Max Min Max Min Max Min Max Min Max
Units
t
ACC
(3)
Address to
Output Delay
CE = OE
= V
IL
45 55 70 90 120 150 ns
t
CE
(2)
CE to Output Delay OE = V
IL
45 55 70 90 120 150 ns
t
OE
(2, 3)
OE to Output Delay CE = V
IL
20 25 30 30 35 40 ns
t
DF
(4, 5)
OE or CE High to
Output Float, wh ic he ve r occ urred first
20 20 25 25 30 35 ns
t
OH
Output Hold from
Address, CE or OE,
whichever occurred firs t
777000 ns
Notes: 2, 3, 4, 5. - see AC Waveforms for Read Operation.
DC and AC Operating Conditions f or Read Operation
AT27C256R
-45 -55 -70
-90 -12
-15
Operating
Temp. (Case)
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
Ind. -40°C - 85°C -40°C - 85°C -40°C - 85°C -40°C - 85°C -40°C - 85°C -40°C - 85°C
V
CC
Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
DC and Operating Characte ristics for Read Operation
Symbol Parameter Condition Min Max Units
I
LI
Input Load Current VIN = 0V to V
CC
±1 µA
I
LO
Output Leakage Current V
OUT
= 0V to V
CC
±5 µA
I
PP1
(2)
VPP
(1)
Read/Standby Current VPP = V
CC
10 µA
I
SB
VCC
(1)
Standby Current
I
SB1
(CMOS), CE = VCC ± 0.3V
100 µA
I
SB2
(TTL), CE = 2.0 to V
CC
+ 0.5V
1mA
I
CC
VCC Active Current
f = 5 MHz, I
OUT
= 0 mA,
CE = V
IL
20 mA
V
IL
Input Low Voltage -0.6 0.8 V
V
IH
Input High Voltage 2.0 VCC + 0.5 V
V
OL
Output Low Voltage IOL = 2.1 mA 0.4 V
V
OH
Output High Voltage IOH = -400 µA 2.4 V
Notes: 1. VCC must be applied simultaneou sl y or before VPP,
and removed simultaneously or aft er V
PP
.
2. V
PP
may be connected directly to VCC, except during program-
ming. The supp ly current would then be th e su m of I
CC
and IPP.
3-128 AT27C256R
Pin Capacitance (f = 1MHz, T = 25°C)
(1)
Typ Max Units Conditions
C
IN
46pFV
IN
= 0V
C
OUT
812pFV
OUT
= 0V
Note: 1. Typical values for nominal supply voltage. This parameter is on ly sampl ed and is not 100% tested.
AC Waveforms for Read Operation
(1)
Notes: 1. Timing measure m ent referenc e level is 1.5V f o r - 45
and -55 devices. Input AC drive levels are V
IL
=
0.0V and V
IH
= 3.0V. Timing measurement refer-
ence levels for all other speed grades are V
OL
=
0.8V and V
OH
= 2.0V. Input AC drive levels are V
IL
= 0.45V and VIH = 2.4V.
2.
OE may be delayed up to t
CE
- tOE after the falling
edge of
CE without impact on tCE.
3. OE may be delayed up to t
ACC
- tOE after the address is valid
without impact on t
ACC
.
4. This parameter is only sampled and is not 100% te st ed .
5. Output float is defined as the point when data is no longer
driven.
Input Test Waveforms and Measurement Levels
tR, tF < 5 ns (10% to 90%)
For -45 and -55 devices only:
For -70, -90, -12, and -15 devices:
Output Test Load
Note: CL= 100 pF including jig
capacitance, except for
the -45 and -55 devices,
where C
L
= 30 pF.
tR, tF < 20 ns (10% to 90%)
AT27C256R
3-129
Programming Wavef or ms
(1)
Notes: 1. The Input Ti mi ng Reference is 0.8V for VIL and
2.0V for V
IH
.
2. t
OE
and t
DFP
are characteristics of the device but
must be accommodated by the programmer.
3. When programming the AT27C256R a 0.1 µF capacitor is
required across V
PP
and ground to suppress spurious voltage
transients.
DC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25 V
Symbol Parameter
Test
Conditions
Limits
Units
Min
Max
I
LI
Input Load Current V
IN
= VIL,V
IH
±10 µA
V
IL
Input Low Level -0.6 0.8 V
V
IH
Input High Level 2.0 VCC + 1 V
V
OL
Output Low Volt. IOL = 2.1 mA 0.4 V
V
OH
Output High Volt. I
OH
= -400 µA2.4 V
I
CC2
VCC Supply Current
(Program and Verify)
25 mA
I
PP2
VPP Current CE = V
IL
25 mA
V
ID
A9 Product Identification Voltage 11.5 12.5 V
3-130 AT27C256R
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25 V
Symbol Parameter
Test
Conditions*
(1)
Limits
Units
Min Max
t
AS
Address Setup Time 2 µs
t
OES
OE Setup Time 2 µs
t
DS
Data Setup
Time
2
µs
t
AH
Address Hold Time 0 µs
t
DH
Data Hold Time 2 µs
t
DFP
OE High to Output Float Delay
(2)
0130ns
t
VPS
VPP Setup
Time
2
µs
t
VCS
VCC Setup
Time
2
µs
t
PW
CE Program
Pulse Width
(3)
95 105 µs
t
OE
Data
Valid from OE
(2)
150 ns
t
PRT
VPP Pulse Rise Time During
Programming
50 ns
*AC Conditions of Test:
Input Rise and Fa ll T imes (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. V
CC
must be applied simultaneou sl y or before V
PP
and removed simultaneously or aft er 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 Puls e width tolerance is 100 µsec ± 5%.
Atmel’s 27C256R Integrated
Product Identification Code
Codes
Pins
Hex
Data
A0 O7 O6 O5 O4 O3 O2 O1 O0
Manufacturer0000111101E
Device Type 1100011008C
Rapid Programming Algor it hm
A 100 µs CE pulse width is used to program. The address
is set to the first location. V
CC
is raised to 6.5V and VPP is
raised to 13.0V. Each address is first programmed with
one 100 µs
CE pulse without verification. Then a verification/reprogramming loop is executed for each address. In
the event a byte fails to pass verification, up to 10 successive 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
been checked. V
PP
is then lowered to 5.0V and VCC to
5.0V. All bytes are read again and compared with the original data to determine if the device passes or fails.
AT27C256R
3-131
(continued)
t
ACC
(ns)
I
CC
(mA)
Ordering Code Package Operation Range
Active Standby
45 20 0.1 AT27C256R-45JC 32J Commercial
AT27C256R-45PC 28P6 (0°C to 70°C)
AT27C256R-45RC 28R
AT27C256R-45TC 28T
20 0.1 AT27C256R-45JI 32J Industrial
AT27C256R-45PI 28P6 (-40°C to 85°C)
AT27C256R-45RI 28R
AT27C256R-45TI 28T
55 20 0.1 AT27C256R-55JC 32J Commercial
AT27C256R-55PC 28P6 (0°C to 70°C)
AT27C256R-55RC 28R
AT27C256R-55TC 28T
20 0.1 AT27C256R-55JI 32J Industrial
AT27C256R-55PI 28P6 (-40°C to 85°C)
AT27C256R-55RI 28R
AT27C256R-55TI 28T
70 20 0.1 AT27C256R-70JC 32J Commercial
AT27C256R-70PC 28P6 (0°C to 70°C)
AT27C256R-70RC 28R
AT27C256R-70TC 28T
20 0.1 AT27C256R-70JI 32J Industrial
AT27C256R-70PI 28P6 (-40°C to 85°C)
AT27C256R-70RI 28R
AT27C256R-70TI 28T
90 20 0.1 AT27C256R-90JC 32J Commercial
AT27C256R-90PC 28P6 (0°C to 70°C)
AT27C256R-90RC 28R
AT27C256R-90TC 28T
20 0.1 AT27C256R-90JI 32J Industrial
AT27C256R-90PI 28P6 (-40°C to 85°C)
AT27C256R-90RI 28R
AT27C256R-90TI 28T
120 20 0.1 AT27C256R-12JC 32J Commercial
AT27C256R-12PC 28P6 (0°C to 70°C)
AT27C256R-12RC 28R
AT27C256R-12TC 28T
20 0.1 AT27C256R-12JI 32J Industrial
AT27C256R-12PI 28P6 (-40°C to 85°C)
AT27C256R-12RI 28R
AT27C256R-12TI 28T
Ordering Information
3-132 AT27C256R
Package Type
32J 32 Lead, Plastic J-Leaded Chip Carrier (PLCC)
28P6 28 Lead, 0.600" Wide, Plastic Du al Inl ine Pac ka ge (PDI P)
28R 28 Lead, 0.330" Wide, Pla stic Gull Wing Small Outl in e (SOIC)
28T 28 Lead, Plastic Thin Small Outline Package (TSOP)
t
ACC
(ns)
I
CC
(mA)
Ordering Code Package Operation Range
Active Standby
150 20 0.1 AT27C256R-15JC 32J Commercial
AT27C256R-15PC 28P6 (0°C to 70°C)
AT27C256R-15RC 28R
AT27C256R-15TC 28T
20 0.1 AT27C256R-15JI 32J Industrial
AT27C256R-15PI 28P6 (-40°C to 85°C)
AT27C256R-15RI 28R
AT27C256R-15TI 28T
Ordering Information (Continued)
AT27C256R
3-133
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