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 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
Integrated Product Identification Code
Industrial and Automotive Temperature Ranges
Green (Pb/Halide-free) Packaging Option
•
•
•
512K (64K x 8)
OTP EPROM
AT27C512R
•
•
•
•
•
1. Description
The AT27C512R is a low-power, high-performance 524,288-bit one-time programma-
ble read-only memory (OTP EPROM) organized 64K 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 high-speed, lower active power consump-
tion, and significantly faster programming. Power consumption is typically only 8 mA
in Active Mode and less than 10
µA
in Standby.
The AT27C512R is available in a choice of industry-standard JEDEC-approved one-
time programmable (OTP) plastic PDIP, PLCC, SOIC, and TSOP packages. All
devices feature two-line control (CE, OE) to give designers the flexibility to prevent
bus contention.
With 64K byte storage capability, the AT27C512R allows firmware to be stored reli-
ably and to be accessed by the system without the delays of mass storage media.
Atmel’s AT27C512R has additional features to ensure high quality and efficient pro-
duction 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.
0015O–EPROM–12/07
2. Pin Configurations
Pin Name
A0 - A15
O0 - O7
CE
OE/VPP
NC
Function
Addresses
Outputs
Chip Enable
Output Enable/ Program Supply
No Connect
2.1
28-lead PDIP/SOIC Top View
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
A14
A13
A8
A9
A11
OE/VPP
A10
CE
O7
O6
O5
O4
O3
2.3
28-lead TSOP Top View – Type 1
OE/VPP
A11
A9
A8
A13
A14
VCC
A15
A12
A7
A6
A5
A4
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
O0
A0
A1
A2
2.2
32-lead PLCC Top View
A7
A12
A15
NC
VCC
A14
A13
Note:
PLCC Package Pins 1 and 17 are Don’t Connect.
2
AT27C512R
0015O–EPROM–12/07
O1
O2
GND
NC
O3
O4
O5
14
15
16
17
18
19
20
A6
A5
A4
A3
A2
A1
A0
NC
O0
5
6
7
8
9
10
11
12
13
4
3
2
1
32
31
30
29
28
27
26
25
24
23
22
21
A8
A9
A11
NC
OE/VPP
A10
CE
O7
O6
AT27C512R
3. System Considerations
Switching between active and standby conditions via the Chip Enable pin may produce tran-
sient voltage excursions. Unless accommodated by the system design, these transients may
exceed datasheet 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 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.
4. Block Diagram
5. Absolute Maximum Ratings*
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)
V
PP
Supply Voltage with
Respect to Ground ......................................-2.0V to + 14.0V
(1)
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 overshoot to +7.0 volts for pulses of less than 20 ns.
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage
to the device. This is a stress rating only and func-
tional operation of the device at these or any other
conditions beyond those indicated in the opera-
tional sections of this specification is not implied.
Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
3
0015O–EPROM–12/07
6. Operating Modes
Mode/Pin
Read
Output Disable
Standby
Rapid Program
(2)
PGM Inhibit
Product Identification
(4)
Notes:
1. X can be V
IL
or V
IH
.
2. Refer to Programming Characteristics.
3. V
H
= 12.0 ± 0.5V.
4. Two identifier bytes may be selected. All Ai inputs are held low (V
IL
), except A9 which is set to V
H
and A0 which is toggled
low (V
IL
) to select the Manufacturer’s Identification byte and high (V
IH
) to select the Device Code byte.
CE
V
IL
V
IL
V
IH
V
IL
V
IH
V
IL
OE/V
PP
V
IL
V
IH
X
(1)
V
PP
V
PP
V
IL
Ai
Ai
X
(1)
X
Ai
X
(1)
A9 =V
H(3)
A0 = V
IH
or V
IL
A1 - A15 = V
IL
Outputs
D
OUT
High Z
High Z
D
IN
High Z
Identification Code
7. DC and AC Operating Conditions for Read Operation
AT27C512R
-45
Ind.
Operating Temp.(Case)
Auto.
V
CC
Supply
5V ± 10%
-40° C - 125° C
5V ± 10%
-40°C - 85°C
-70
-40°C - 85°C
8. DC and Operating Characteristics for Read Operation
Symbol
I
LI
Parameter
Input Load Current
Condition
Ind.
V
IN
= 0V to V
CC
Auto.
Ind.
I
LO
Output Leakage Current
V
OUT
= 0V to V
CC
I
SB1
(CMOS), CE = V
CC
±
0.3V
I
SB2
(TTL), CE = 2.0 to V
CC
+
0.5V
f = 5 MHz, I
OUT
= 0 mA, CE = V
IL
-0.6
2.0
I
OL
= 2.1 mA
I
OH
= -400 µA
2.4
Auto.
Min
Max
±1
±5
±5
±10
100
1
20
0.8
V
CC
+ 0.5
0.4
Units
µA
µA
µA
µA
µA
mA
mA
V
V
V
V
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Note:
V
CC(1)
Standby Current
V
CC
Active Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
1. V
CC
must be applied simultaneously with or before OE/V
PP
, and removed simultaneously with or after OE/V
PP
..
4
AT27C512R
0015O–EPROM–12/07
AT27C512R
9. AC Characteristics for Read Operation
AT27C512R
-45
Symbol
t
ACC(1)
t
CE(1)
t
OE(1)
t
DF(1)
t
OH
Note:
Parameter
Address to Output Delay
CE to Output Delay
OE/V
PP
to Output Delay
Condition
CE = OE/V
PP
= V
IL
OE/V
PP
= V
IL
CE = V
IL
Min
Max
45
45
20
20
7
7
Min
-70
Max
70
70
30
25
Units
ns
ns
ns
ns
ns
OE/V
PP
or CE High to Output Float, Whichever Occurred First
Output Hold from Address, CE or OE/V
PP
, Whichever Occurred
First
1. See AC Waveforms for Read Operation.
10. AC Waveforms for Read Operation
(1)
Notes:
1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are V
IL
= 0.0V and V
IH
= 3.0V. Timing mea-
surement reference 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 V
IH
= 2.4V.
2. OE/V
PP
may be delayed up to t
CE
- t
OE
after the falling edge of CE without impact on t
CE
.
3. OE/V
PP
may be delayed up to t
ACC
- t
OE
after the address is valid without impact on t
ACC
.
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.
5
0015O–EPROM–12/07
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