ATMEL AT27C020 2-megabit 256k x 8 otp eprom Datasheet

AT27C020
Features
• Fast Read Access Time - 55 ns
• Low Power CMOS Operation
•
•
•
•
•
•
•
– 100 µA max. Standby
– 25 mA max. Active at 5 MHz
JEDEC Standard Packages
– 32-Lead 600-mil PDIP
– 32-Lead PLCC
– 32-Lead TSOP
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
2-Megabit
(256K x 8)
OTP EPROM
AT27C020
Description
The AT27C020 is a low-power, high performance 2,097,152-bit one-time programmable read only memory (OTP EPROM) organized as 256K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed in
less than 55 ns, eliminating the need for speed reducing WAIT states on high performance microprocessor systems.
In read mode, the AT27C020 typically consumes 8 mA. Standby mode supply current
is typically less than 10 µA.
PLCC Top View
Addresses
O0 - O7
Outputs
CE
Chip Enable
OE
Output Enable
PGM
Program Strobe
A7
A6
A5
A4
A3
A2
A1
A0
O0
4
3
2
1
32
31
30
A0 - A17
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
14
15
16
17
18
19
20
Function
A14
A13
A8
A9
A11
OE
A10
CE
07
01
02
GND
03
04
05
06
Pin Name
A12
A15
A16
VPP
VCC
PGM
A17
Pin Configurations
TSOP Top View
Type 1
PDIP Top View
VPP
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
PGM
A17
A14
A13
A8
A9
A11
OE
A10
CE
07
06
05
04
03
A11
A9
A8
A13
A14
A17
PGM
VCC
VPP
A16
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
OE
A10
CE
07
06
05
04
03
GND
02
01
O0
A0
A1
A2
A3
Rev. 0570C-B–12/97
1
The AT27C020 is available in a choice of industry standard
JEDEC-approved one-time programmable (OTP) plastic
PDIP, PLCC, and TSOP packages. All devices feature twoline control (CE, OE) to give designers the flexibility to prevent bus contention.
With 256K byte storage capability, the AT27C020 allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.
Atmel’s 27C020 have 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 proper programming
algorithms and voltages.
Block Diagram
2
AT27C020
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may 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 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 positioned as close as
possible to the point where the power supply is connected
to the array.
AT27C020
Absolute Maximum Ratings*
Temperature Under Bias.......................-55°C to +125°C
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum 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
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:
Minimum voltage is -0.6V DC which may
undershoot to -2.0V for pulses of less than 20
ns. Maximum output pin voltage is VCC +
0.75V DC which may overshoot to +7.0V for
pulses of less than 20 ns.
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)
1.
VPP Supply Voltage with
Respect to Ground ............................. -2.0V to +14.0V(1)
Operating Modes
Mode/Pin
CE
OE
PGM
Ai
VPP
Outputs
Read
VIL
VIL
X(1)
Ai
X
DOUT
Output Disable
X
VIH
X
X
X
High Z
VIH
X
X
X
X
High Z
VIL
VIH
VIL
Ai
VPP
DIN
PGM Verify
VIL
VIL
VIH
Ai
VPP
DOUT
PGM Inhibit
VIH
X
X
X
VPP
High Z
X
A9 = VH(3)
A0 = VIH or VIL
A1 - A17 = VIL
X
Identification Code
Standby
Rapid Program
(2)
Product Identification
Notes:
(4)
VIL
VIL
1. X can be VIL or VIH.
2. Refer to Programming Characteristics.
3. VH = 12.0 ± 0.5V.
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 Identification byte and high (VIH) to select the Device Code byte.
3
DC and AC Operating Conditions for Read Operation
AT27C020
Operating Temperature
(Case)
-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
Ind.
-40°C - 85C
-40°C - 85C
-40°C - 85C
-40°C - 85C
-40°C - 85C
5V ± 10%
5V ± 10%
5V ± 10%
5V ± 10%
5V ± 10%
VCC Power Supply
DC and Operating Characteristics for Read Operation
Symbol
Parameter
Condition
ILI
Input Load Current
Output Leakage Current
ILO
IPP
(2)
VPP
(1)
Read/Standby Current
Min
Max
Units
VIN = 0V to VCC (Com., Ind.)
±1.0
µA
VOUT = 0V to VCC (Com., Ind.)
±5.0
µA
VPP = VCC
±10
µA
ISB1 (CMOS), CE = VCC ± 0.3V
100
µA
ISB2 (TTL), CE = 2.0 to VCC + 0.5V
1.0
mA
f = 5 MHz, IOUT = 0 mA, CE = VIL
25
mA
ISB
VCC(1) Standby Current
ICC
VCC Active Current
VIL
Input Low Voltage
-0.6
0.8
V
VIH
Input High Voltage
2.0
VCC + 0.5
V
VOL
Output Low Voltage
IOL = 2.1 mA
0.4
V
VOH
Output High Voltage
IOH = -400 µA
Notes:
2.4
V
1. VCC must be applied simultaneously or before VPP, and removed simultaneously 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.
AC Characteristics for Read Operation
AT27C020
-55
4
Min
Max
Min
-90
Parameter
tACC(3)
Address to Output Delay
CE = OE
= VIL
55
70
90
tCE(2)
CE to Output Delay
OE = VIL
55
70
tOE(2)(3)
OE to Output Delay
CE = VIL
20
tDF(4)(5)
OE or CE High
to Output Float,
whichever occurred first
18
tOH
Output Hold
from Address, CE
or OE,whichever
occurred first
7
1. 2, 3, 4, 5. See AC Waveforms for Read Operation diagram.
AT27C020
7
Max
Min
-12
Symbol
Note:
Condition
-70
Max
Units
120
150
ns
90
120
150
ns
30
35
35
40
ns
20
20
30
40
ns
0
Max
Min
-15
0
Max
Min
0
ns
AT27C020
AC Waveforms for Read Operation(1)
Notes:
1.
Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified.
2.
OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.
3.
OE may be delayed up to tACC - tOE after the address is valid without impact on tACC.
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.
Input Test Waveforms and Measurement Levels
Output Test Load (1)
For -55 devices only:
3.0V
AC
DRIVING
LEVELS
1.5V
AC
MEASUREMENT
LEVEL
0.0V
tR, tF < 5 ns (10% to 90%)
Note:
For -70,-90,-12,-15 devices only:
1.
CL = 100 pF including jig
capacitance except -55
devices where CL = 30 pF.
tR, tF < 20 ns (10% to 90%)
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Typ
Max
Units
Conditions
CIN
4
8
pF
VIN = 0V
COUT
8
12
pF
VOUT = 0V
Note:
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
5
Programming Waveforms (1)
Notes:
1.
The Input Timing reference is 0.8V for VIL and 2.0V for VIH.
2.
tOE and tDFP are characteristics of the device but must be accommodated by the programmer.
3.
When programming the AT27C020, a 0.1 µF capacitor is required across VPP and ground to suppress voltage transients.
DC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Limits
6
Symbol
Parameter
Test Conditions
ILI
Input Load Current
VIN = VIL, VIH
VIL
Input Low Level
VIH
Input High Level
VOL
Output Low Voltage
IOL = 2.1 mA
VOH
Output High Voltage
IOH = -400 µA
ICC2
VCC Supply Current (Program and Verify)
IPP2
VPP Supply Current
VID
A9 Product Identification Voltage
AT27C020
Min
Max
Units
±10
µA
-0.6
0.8
V
2.0
VCC + 1.0
V
0.4
V
2.4
CE = PGM = VIL
11.5
V
40
mA
20
mA
12.5
V
AT27C020
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V,VPP = 13.0 ± 0.25V
Limits
Test Condition (1)
Min
Max
Units
Symbol
Parameter
tAS
Address Setup Time
2
µs
tCES
CE Setup Time
2
µs
tOES
OE Setup Time
2
µs
tDS
Data Setup Time
2
µs
tAH
Address Hold Time
0
µs
tDH
Data Hold Time
2
µs
Input Rise and Fall Times:
(10% to 90%) 20 ns.
Input Pulse Levels:
0.45V to 2.4V
tDFP
OE High to Output Float Delay
tVPS
VPP Setup Time
tVCS
VCC Set up Time
0
Input Timing Reference Level:
0.8V to 2.0V
tPW
PGM Program Pulse Width(3)
tOE
Data Valid from OE
tPRT
VPP Pulse Rise Time During
Programming
Notes:
(2)
Output Timing Reference Level:
0.8V to 2.0V
130
ns
2
µs
2
µs
95
105
µs
150
ns
50
ns
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 µs ± 5%.
Atmel’s 27C020 Integrated Product Identification Code
Pins
Codes
A0
O7
O6
O5
O4
O3
O2
O1
O0
Hex Data
Manufacturer
0
0
0
0
1
1
1
1
0
1E
Device Type
1
1
0
0
0
0
1
1
0
86
7
Rapid Programming Algorithm
A 100 µs PGM pulse width is used to program. The
address is set to the first location. VCC is raised to 6.5V and
VPP is raised to 13.0V. Each address is first programmed
with one 100 µs PGM 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. VPP 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.
8
AT27C020
AT27C020
Ordering Information
ICC (mA)
tACC
(ns)
Active
Standby
55
25
0.1
AT27C020-55JC
AT27C020-55PC
AT27C020-55TC
32J
32P6
32T
Commercial
(0°C to 70°C)
25
0.1
AT27C020-55JI
AT27C020-55PI
AT27C020-55TI
32J
32P6
32T
Industrial
(-40°C to 85°C)
25
0.1
AT27C020-70JC
AT27C020-70PC
AT27C020-70TC
32J
32P6
32T
Commercial
(0°C to 70°C)
25
0.1
AT27C020-70JI
AT27C020-70PI
AT27C020-70TI
32J
32P6
32T
Industrial
(-40°C to 85°C)
25
0.1
AT27C020-90JC
AT27C020-90PC
AT27C020-90TC
32J
32P6
32T
Commercial
(0°C to 70°C)
25
0.1
AT27C020-90JI
AT27C020-90PI
AT27C020-90TI
32J
32P6
32T
Industrial
(-40°C to 85°C)
25
0.1
AT27C020-12JC
AT27C020-12PC
AT27C020-12TC
32J
32P6
32T
Commercial
(0°C to 70°C)
25
0.1
AT27C020-12JI
AT27C020-12PI
AT27C020-12TI
32J
32P6
32T
Industrial
(-40°C to 85°C)
25
0.1
AT27C020-15JC
AT27C020-15PC
AT27C020-15TC
32J
32P6
32T
Commercial
(0°C to 70°C)
25
0.1
AT27C020-15JI
AT27C020-15PI
AT27C020-15TI
32J
32P6
32T
Industrial
(-40°C to 85°C)
70
90
120
150
Ordering Code
Package
Operation Range
Package Type
32J
32-Lead,Plastic J-Leaded Chip Carrier (PLCC)
32P6
32-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
32T
32-Lead, Plastic Thin Small Outline Package (TSOP)
9
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