AT27C020 - Complete

Features
• Fast read access time – 55ns
• Low-power CMOS operation
•
•
•
•
•
•
•
•
– 100µA max standby
– 25mA max active at 5MHz
JEDEC standard packages
– 32-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
1.
2Mb (256K x 8)
One-time
Programmable,
Read-only Memory
Atmel AT27C020
Description
The Atmel® 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
55ns, eliminating the need for speed-reducing WAIT states on high-performance microprocessor systems.
In read mode, the AT27C020 typically consumes 8mA. Standby mode supply current is
typically less than 10µA.
The AT27C020 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 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.
The AT27C020 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 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 programming algorithms and voltages.
0570H–EPROM–4/11
Pin configurations
Addresses
O0 - O7
Outputs
CE
Chip enable
OE
Output enable
PGM
Program strobe
32-lead PDIP
Top view
A12
A15
A16
VPP
VCC
PGM
A17
A0 - A17
32-lead PLCC
Top view
A7
A6
A5
A4
A3
A2
A1
A0
O0
4
3
2
1
32
31
30
Function
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
Pin name
01
02
GND
03
04
05
06
2.
3.
A14
A13
A8
A9
A11
OE
A10
CE
07
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
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 datasheet limits, resulting in device nonconformance.
At a minimum, a 0.1µF, high-frequency, 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 4.7µF 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.
Figure 3-1.
2
Block diagram
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
4.
Absolute maximum ratings*
*NOTICE:
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)
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.
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)
Note:
5.
1. Minimum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20ns. Maximum output pin voltage is
VCC + 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns.
DC and AC characteristics
Table 5-1.
Operating modes
Mode/Pin
CE
OE
PGM
Ai
VPP
Outputs
(1)
Ai
X
DOUT
Read
VIL
VIL
X
Output disable
X
VIH
X
X
X
High-Z
Standby
VIH
X
X
X
X
High-Z
Rapid program(2)
VIL
VIH
VIL
Ai
VPP
DIN
PGM verify
VIL
VIL
VIH
Ai
VPP
DOUT
PGM inhibit
VIH
X
X
X
VPP
High-Z
X
Identification code
(3)
Product identification(4)
Notes:
VIL
VIL
X
A9 = VH
A0 = VIH or VIL
A1 - A17 = 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.
Table 5-2.
DC and AC operating conditions for read operation
Atmel AT27C020
Ind.
-55
-90
-40C - 85C
-40C - 85C
Operating temperature (case)
Auto.
VCC power supply
-40C - 125C
5V 10%
5V 10%
3
0570H–EPROM–4/11
Table 5-3.
DC and operating characteristics for read operation
Symbol
Parameter
Condition
ILI
Input load current
ILO
IPP(2)
ISB
VCC(1) standby current
ICC
VCC active current
VIL
Input low voltage
VIH
Input high voltage
VOL
Output low voltage
IOL = 2.1mA
VOH
Output high voltage
IOH = -400µA
Notes:
Max
Units
VIN = 0V to VCC (Com., Ind.)
±1.0
µA
Output leakage current
VOUT = 0V to VCC (Com., Ind.)
±5.0
µA
VPP(1)
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 = 5MHz, IOUT = 0mA, CE = VIL
25
mA
-0.6
0.8
V
2.0
VCC + 0.5
V
0.4
V
read/standby current
Min
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 .
Table 5-4.
AC characteristics for read operation
Atmel AT27C020
-55
4
Symbol
Parameter
Condition
tACC(3)
Address to output delay
CE = OE
= VIL
tCE(2)
CE to output delay
tOE(2)(3)
OE to output delay
tDF(4)(5)
OE or CE high to output float,
Whichever occurred first
tOH
Output hold from address, CE or OE,
Whichever occurred first
Min
-90
Max
Units
55
90
ns
OE = VIL
55
90
ns
CE = VIL
20
35
ns
18
20
ns
7
Max
Min
0
ns
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
Figure 5-1.
Notes:
AC waveforms for read operation(1)
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.
Figure 5-2.
Input test waveforms and measurement levels
For -55 devices only:
3.0V
AC
DRIVING
LEVELS
1.5V
AC
MEASUREMENT
LEVEL
0.0V
tR, tF < 5ns (10% to 90%)
For -90 devices only:
tR, tF < 20ns (10% to 90%)
Figure 5-3.
Note:
Output test load
CL = 100pF including jig capacitance, except -55 devices, where CL = 30pF
5
0570H–EPROM–4/11
Table 5-5.
Pin capacitance
f = 1MHz, T = 25C(1)
Symbol
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.
Figure 5-4.
Note:
Programming waveforms (1)
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 Atmel AT27C020, a 0.1µF capacitor is required across VPP and ground to suppress voltage
transients
6
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
Table 5-6.
DC programming characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Limits
Symbol
Parameter
Test conditions
ILI
Input load current
VIN = VIL, VIH
VIL
Input low level
VIH
Input high level
VOL
Output low voltage
IOL = 2.1mA
VOH
Output high voltage
IOH = -400µA
ICC2
VCC supply current (program and verify)
IPP2
VPP supply current
VID
A9 product identification voltage
Table 5-7.
Min
Max
Units
10
µA
-0.6
0.8
V
2.0
VCC + 1.0
V
0.4
V
2.4
V
CE = PGM = VIL
11.5
40
mA
20
mA
12.5
V
Max
Units
AC programming characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V,VPP = 13.0 ± 0.25V
Limits
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
tDFP
Input rise and fall times:
(10% to 90%) 20ns
Input pulse levels:
0.45V to 2.4V
OE high to output float delay
tVPS
VPP setup time
tVCS
VCC setup time
tPW
PGM program pulse width
tOE
Data valid from OE
tPRT
VPP pulse rise time during
programming
Notes:
Test condition
(1)
(2)
0
Input timing reference level:
0.8V to 2.0V
(3)
Min
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 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%.
7
0570H–EPROM–4/11
Table 5-8.
The Atmel AT27C020 integrated product identification code
Pins
Codes
6.
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
Rapid programming algorithm
A 100µs 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 100µs 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 100µs 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
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
Figure 6-1.
Rapid programming algorithm
9
0570H–EPROM–4/11
7.
Ordering information
Green package (Pb/halide-free)
ICC (mA)
tACC
(ns)
Active
Standby
Atmel ordering code
Package
Lead finish
Operation range
55
25
0.1
AT27C020-55JU
AT27C020-55PU
32J
32P6
Matte tin
Matte Tin
Industrial
(-40C to 85C)
90
25
0.1
AT27C020-90JU
AT27C020-90PU
32J
32P6
Matte tin
Matte tin
Industrial
(-40C to 85C)
Package type
10
32J
32-lead, plastic, J-leaded chip carrier (PLCC)
32P6
32-lead, 0.600" wide, plastic, dual inline package (PDIP)
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
8.
Packaging information
32J – PLCC
1.14(0.045) X 45°
PIN NO. 1
IDENTIFIER
1.14(0.045) X 45°
0.318(0.0125)
0.191(0.0075)
E1
E2
B1
E
B
e
A2
D1
A1
D
A
0.51(0.020)MAX
45° MAX (3X)
COMMON DIMENSIONS
(Unit of measure = mm)
D2
Notes:
1. This package conforms to JEDEC reference MS-016, Variation AE.
2. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is .010"(0.254mm) per side. Dimension D1
and E1 include mold mismatch and are measured at the extreme
material condition at the upper or lower parting line.
3. Lead coplanarity is 0.004" (0.10mm) maximum.
SYMBOL
MIN
NOM
MAX
A
3.175
–
3.556
A1
1.524
–
2.413
A2
0.381
–
–
D
12.319
–
12.573
D1
11.354
–
11.506
D2
9.906
–
10.922
E
14.859
–
15.113
E1
13.894
–
14.046
E2
12.471
–
13.487
B
0.660
–
0.813
B1
0.330
–
0.533
e
NOTE
Note 2
Note 2
1.270 TYP
10/04/01
Package Drawing Contact:
[email protected]
TITLE
32J, 32-lead, Plastic J-leaded Chip Carrier (PLCC)
DRAWING NO.
32J
REV.
B
11
0570H–EPROM–4/11
32P6 – PDIP
D
PIN
1
E1
A
SEATING PLANE
A1
L
B
B1
e
E
0º ~ 15º
C
eB
Note:
1. Dimensions D and E1 do not include mold Flash or Protrusion.
Mold Flash or Protrusion shall not exceed 0.25mm (0.010").
COMMON DIMENSIONS
(Unit of Measure = mm)
REF
SYMBOL
MIN
NOM
MAX
A
–
–
4.826
A1
0.381
–
–
D
41.783
–
42.291
E
15.240
–
15.875
E1
13.462
–
13.970
B
0.356
–
0.559
B1
1.041
–
1.651
L
3.048
–
3.556
C
0.203
–
0.381
eB
15.494
–
17.526
e
NOTE
Note 1
Note 1
2.540 TYP
09/28/01
Package Drawing Contact:
[email protected]
12
TITLE
32P6, 32-lead (0.600"/15.24mm wide) Plastic Dual
Inline Package (PDIP)
DRAWING NO.
32P6
REV.
B
Atmel AT27C020
0570H–EPROM–4/11
Atmel AT27C020
9.
Revision history
Doc. Rev.
Date
0570H
04/2011
0570G
12/2007
Comments
Remove TSOP package
Add lead finish to ordering information
13
0570H–EPROM–4/11
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