Features
•
Fast Read Access Time - 45 ns
•
Low Power CMOS Operation
•
•
•
•
•
•
•
– 100 µA max. Standby
– 30 mA max. Active at 5 MHz
JEDEC Standard Packages
– 44-Lead PLCC
– 40-Lead VSOP (10mm x 14mm)
5V
±
10% Power Supply
High Reliability CMOS Technology
– 2000V ESD Protection
– 200 mA Latchup Immunity
Rapid™ Programming Algorithm - 50 µs/word (typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Commercial and Industrial Temperature Ranges
512K (32K x 16)
OTP EPROM
AT27C516
Description
The AT27C516 is a low-power, high performance 524,288-bit one-time programmable
read only memory (OTP EPROM) organized 32K by 16 bits. It requires only one 5V
power supply in normal read mode operation. Any word can be accessed in less than
45 ns, eliminating the need for speed reducing WAIT states. The by-16 organization
make this part ideal for high-performance 16- and 32-bit microprocessor systems.
In read mode, the AT27C516 typically consumes 15 mA. Standby mode supply cur-
rent is typically less than 10
µA.
(continued)
Pin Configurations
Pin Name
A0 - A14
O0 - O15
CE
OE
PGM
NC
Note:
Function
Addresses
Outputs
Chip Enable
Output Enable
Program Strobe
No Connect
Both GND pins must be connected.
PLCC Top View
O13
O14
O15
CE
VPP
NC
VCC
PGM
NC
NC
A14
A9
A10
A11
A12
A13
A14
NC
NC
PGM
VCC
VPP
CE
O15
O14
O13
O12
O11
O10
O9
O8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GND
A8
A7
A6
A5
A4
A3
A2
A1
A0
OE
O0
O1
O2
O3
O4
O5
O6
O7
GND
VSOP Top View
Type 1
O3
O2
O1
O0
OE
NC
A0
A1
A2
A3
A4
18
19
20
21
22
23
24
25
26
27
28
O12
O11
O10
O9
O8
GND
NC
O7
O6
O5
O4
7
8
9
10
11
12
13
14
15
16
17
6
5
4
3
2
1
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
A13
A12
A11
A10
A9
GND
NC
A8
A7
A6
A5
Rev. 0362C–10/98
Note: PLCC Package Pins 1 and 23 are
DON’T CONNECT.
1
The AT27C516 is available in industry standard JEDEC-
approved one-time programmable (OTP) plastic PLCC and
VSOP packages. The device features two-line control (CE,
OE) to eliminate bus contention in high-speed systems.
With 32K word storage capability, the AT27C516 allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.
Atmel’s 27C516 have 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 50
µs/word.
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.
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 tran-
sients 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 uti-
lized 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.
Block Diagram
2
AT27C516
AT27C516
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 dam-
age 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
Operating Modes
Mode \ Pin
Read
Output Disable
Standby
Rapid Program
(2)
PGM Verify
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.
5. Standby V
CC
current (I
SB
) is specified with V
PP
= V
CC
. V
CC
> V
PP
will cause a slight increase in I
SB
.
CE
V
IL
X
V
IH
V
IL
V
IL
V
IH
V
IL
OE
V
IL
V
IH
X
V
IH
V
IL
X
V
IL
PGM
X
(1)
X
X
V
IL
V
IH
X
X
Ai
Ai
X
X
Ai
Ai
X
A9 = V
H(3)
A0 = V
IH
or V
IL
A1 - A14 = V
IL
V
PP
X
X
X
(5)
V
PP
V
PP
V
PP
V
CC
Outputs
D
OUT
High Z
High Z
D
IN
D
OUT
High Z
Identification Code
3
DC and AC Operating Conditions for Read Operation
AT27C516
-45
Operating
Temperature (Case)
V
CC
Power Supply
Com.
Ind.
0°C - 70°C
-40°C - 85°C
5V
±
10%
-55
0°C - 70°C
-40°C - 85°C
5V
±
10%
-70
0°C - 70°C
-40°C - 85°C
5V
±
10%
-85
0°C - 70°C
-40°C - 85°C
5V
±
10%
-10
0°C - 70°C
-40°C - 85°C
5V
±
10%
DC and Operating Characteristics for Read Operation
Symbol
I
LI
I
LO
I
PP1(2)
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Notes:
Parameter
Input Load Current
Output Leakage Current
V
PP(1)
Read/Standby Current
V
CC(1)
Standby Current
V
CC
Active Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
I
OL
= 2.1 mA
I
OH
= -400
µA
2.4
Condition
V
IN
= 0V to V
CC
V
OUT
= 0V to V
CC
V
PP
= 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
Min
Max
±
1
±
5
10
100
1
30
0.8
V
CC
+ 0.5
0.4
Units
µA
µA
µA
µA
mA
mA
V
V
V
V
1. V
CC
must be applied simultaneously with or before V
PP
, and removed simultaneously with or after V
PP
.
.
2. V
PP
may be connected directly to V
CC
, except during programming. The supply current would then be the sum of I
CC
and I
PP
4
AT27C516
AT27C516
AC Waveforms for Read Operation
(1)
AC Characteristics for Read Operation
AT27C516
-45
Symbol
t
ACC(3)
t
CE(2)
t
OE(2)(3)
t
DF(4)(5)
t
OH
Notes:
Parameter
Address to Output
Delay
CE to Output
Delay
OE to Output
Delay
Condition
CE = OE = V
IL
OE = V
IL
CE = V
IL
Min
Max
Min
-55
Max
Min
-70
Max
Min
-85
Max
Min
-10
Max
Units
ns
ns
ns
ns
ns
45
45
20
20
7
7
55
55
25
25
7
70
70
25
25
0
85
85
30
30
0
100
100
30
30
OE or CE High to Output Float,
whichever occurred first
Output Hold from Address, CE or OE,
whichever occurred first
1. Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are V
IL
= 0.0V and V
IH
= 3.0V.
Timing measurement 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 may be delayed up to t
CE
- t
OE
after the falling edge of CE without impact on t
CE
.
3. OE 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
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