Description
The AT27C516 is a low-power, high performance 524,288 bit one-time programma-
ble 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 organi-
zation make this part ideal for high-performance 16 and 32 bit microprocessor sys-
tems.
(continued)
AT27C516
Pin Configurations
Pin Name
Function
A0 - A14
Addresses
O0 - O15
Outputs
CE
Chip Enable
OE
Output Enable
PGM
Program Strobe
NC
No Connect
Note: Both GND pins must
be connected.
512K (32K x 16)
OTP CMOS
EPROM
Note: PLCC Package Pins 1
and 23 are DON'T CONNECT.
PLCC Top View
Features
Fast Read Access Time - 45 ns
Low Power CMOS Operation
100
A max. Standby
30 mA max. Active at 5 MHz
JEDEC Standard Packages
44-Lead PLCC
40-Lead TSOP (10mm x 14mm)
5V
10% Power Supply
High Reliability CMOS Technology
2000V ESD Protection
200 mA Latchup Immunity
Rapid
TM
Programming Algorithm - 50
s/word (typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Commercial and Industrial Temperature Ranges
TSOP Top View
Type 1
0362C
AT27C516
3-145
In read mode, the AT27C516 typically consumes 15 mA.
Standby mode supply current is typically less than 10
A.
T h e A T2 7C 51 6 is ava il ab le i n in du s try s ta nd ard
JEDEC-approved one-time programmable (OTP) plastic
PLCC and TSOP 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
TM
Program-
ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 50
s/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 program-
ming algorithms and voltages.
Description (Continued)
Switching between active and standby conditions via the
Chip Enable pin may produce transient voltage excur-
sions. Unless accommodated by the system design, these
transients may exceed data sheet limits, resulting in de-
vice non-conformance. At a minimum, a 0.1
F high fre-
quency, 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
F bulk electrolytic
capacitor should be utilized, again connected between the
V
CC
and Ground terminals. This capacitor should be posi-
tioned as close as possible to the point where the power
supply is connected to the array.
System Considerations
3-146
AT27C516
Block Diagram
Temperature Under Bias ................ -55C to +125C
Storage Temperature...................... -65C to +150C
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)
*NOTICE: Stresses beyond those listed under "Absolute Maxi-
mum 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 indi-
cated 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 overshoot
to +7.0V for pulses of less than 20 ns.
Absolute Maximum Ratings*
Operating Modes
Mode \ Pin
CE
OE
PGM
Ai
V
PP
Outputs
Read
V
IL
V
IL
X
(1)
Ai
X
D
OUT
Output Disable
X
V
IH
X
X
X
High Z
Standby
V
IH
X
X
X
X
(5)
High Z
Rapid Program
(2)
V
IL
V
IH
V
IL
Ai
V
PP
D
IN
PGM Verify
V
IL
V
IL
V
IH
Ai
V
PP
D
OUT
PGM Inhibit
V
IH
X
X
X
V
PP
High Z
Product Identification
(4)
V
IL
V
IL
X
A9 = V
H
(
3
)
A0 = V
IH
or V
IL
A1 - A14 = V
IL
V
CC
Identification
Code
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 words may be selected. All Ai inputs are held
low (V
IL
), except A9 which is set to V
H
and A0 which is tog-
gled low (V
IL
) to select the Manufacturer's Identification
word and high (V
IH
) to select the Device Code word.
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
.
AT27C516
3-147
AC Characteristics for Read Operation
AT27C516
-45
-55
-70
-85
-10
Symbol
Parameter
Condition
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Units
t
ACC
(3)
Address to Output Delay
CE = OE = VIL
45
55
70
85
100
ns
t
CE
(2)
CE to Output Delay
OE = V
IL
45
55
70
85
100
ns
t
OE
(2, 3)
OE to Output Delay
CE = V
IL
20
25
25
30
30
ns
t
DF
(4, 5)
OE or CE High to Output Float,
whichever occurred first
20
25
25
30
30
ns
t
OH
Output Hold from Address,
CE or OE, whichever
occurred first
7
7
7
0
0
ns
Notes:
2, 3, 4, 5. - see AC Waveforms for Read Operation.
DC and AC Operating Conditions for Read Operation
AT27C516
-45
-55
-70
-85
-10
Operating
Temperature (Case)
Com.
0C - 70C
0C - 70C
0C - 70C
0C - 70C
0C - 70C
Ind.
-40C - 85C
-40C - 85C
-40C - 85C
-40C - 85C
-40C - 85C
V
CC
Power Supply
5V
10%
5V
10%
5V
10%
5V
10%
5V
10%
DC and Operating Characteristics for Read Operation
Symbol
Parameter
Condition
Min
Max
Units
I
LI
Input Load Current
V
IN
= 0V to V
CC
1
A
I
LO
Output Leakage Current
V
OUT
= 0V to V
CC
5
A
I
PP1
(
2
)
V
PP
(
1
)
Read/Standby Current
V
PP
= V
CC
10
A
I
SB
V
CC
(
1
)
Standby Current
I
SB1
(CMOS), CE = V
CC
0.3V
100
A
I
SB2
(TTL), CE = 2.0 to V
CC
+ 0.5V
1
mA
I
CC
V
CC
Active Current
f = 5 MHz, I
OUT
= 0 mA, CE = V
IL
30
mA
V
IL
Input Low Voltage
-0.6
0.8
V
V
IH
Input High Voltage
2.0
V
CC
+ 0.5
V
V
OL
Output Low Voltage
I
OL
= 2.1 mA
0.4
V
V
OH
Output High Voltage
I
OH
= -400
A
2.4
V
Notes: 1. V
CC
must be applied simultaneously or before V
PP
,
and removed simultaneously or after V
PP
.
2. V
PP
may be connected directly to V
CC
, except during pro-
gramming. The supply current would then be the sum of I
CC
and I
PP
.
3-148
AT27C516
Pin Capacitance
(f = 1 MHz T = 25C)
(1)
Typ
Max
Units
Conditions
C
IN
4
10
pF
V
IN
= 0V
C
OUT
8
12
pF
V
OUT
= 0V
Note:
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
AC Waveforms for Read Operation
(1)
Notes: 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.
Input Test Waveforms and Measurement Levels
t
R
, t
F
< 5 ns (10% to 90%)
For -45, -55, and -70
Devices Only:
Output Test Load
Note: CL = 100 pF including jig
capacitance except -45, -55 and -70
devices, where CL = 30 pF.
t
R
, t
F
< 20 ns (10% to 90%)
For -85 and -10
Devices Only:
AT27C516
3-149
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