AT27C1024
1
PDIP Top View
TSOP Top View
Type 1
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
40-Lead 600-mil PDIP
44-Lead PLCC
40-Lead TSOP (10 mm x 14 mm)
Direct Upgrade from 512K (AT27C516) EPROM
5V
10% Power Supply
High Reliability CMOS Technology
2000V ESD Protection
200 mA Latchup Immunity
Rapid
TM
Programming Algorithm - 100
s/word (typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Commercial and Industrial Temperature Ranges
Description
The AT27C1024 is a low-power, high-performance 1,048,576 bit one-time program-
mable read only memory (OTP EPROM) organized 64K 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.
0019I-A7/97
AT27C1024
1-Megabit
(64K x 16)
OTP EPROM
AT27C1024
Pin Configurations
Note:
Both GND pins must be
connected.
Pin Name
Function
A0 - A15
Addresses
O0 - O15
Outputs
CE
Chip Enable
OE
Output Enable
PGM
Program Strobe
NC
No Connect
(continued)
AT27C1024
2
In read mode, the AT27C1024 typically consumes 15 mA.
Standby mode supply current is typically less than 10
A.
The AT27C1024 is available in industry standard JEDEC-
approved one-time programmable (OTP) plastic PDIP,
PLCC, and TSOP packages. The device features two-line
control (CE, OE) to eliminate bus contention in high-speed
systems.
With high density 64K word storage capability, the
AT27C1024 allows firmware to be stored reliably and to be
accessed by the system without the delays of mass storage
media.
Atmel's 27C1024 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 100
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 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
F 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
F 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.
AT27C1024
3
Block Diagram
Absolute Maximum Ratings*
Temperature Under Bias ...................... -55
C to +125
C
*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 condi-
tions beyond those indicated in the operational sec-
tions 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 V
CC
+ 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)
V
PP
Supply Voltage with
Respect to Ground ............................-2.0V to +14.0V
(1)
Operating Modes
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 toggled
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
.
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 - A15 = V
IL
V
CC
Identification Code
AT27C1024
4
DC and AC Operating Conditions for Read Operation
DC and Operating Characteristics for Read Operation
Note:
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 programming. The supply current would then be the sum of I
CC
and
I
PP
.
AC Characteristics for Read Operation
Notes:
2, 3, 4, 5. - see AC Waveforms for Read Operation.
AT27C1024
-45
-55
-70
-90
-12
-15
Operating
Temperature
(Case)
Com.
0
C - 70
C
0
C - 70
C
0
C - 70
C
0
C - 70
C
0
C - 70
C
0
C - 70
C
Ind.
-40
C - 85
C
-40
C - 85
C
-40
C - 85
C
-40
C - 85
C
-40
C - 85
C
-40
C - 85
C
V
CC
Power Supply
5V
10%
5V
10%
5V
10%
5V
10%
5V
10%
5V
10%
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
IPP1
(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
AT27C1024
Units
-45
-55
-70
-90
-12
-15
Symbol
Parameter
Condition
Min Max Min Max Min Max Min Max Min Max Min Max
t
ACC
(3)
Address to
Output Delay
CE = OE
= V
IL
45
55
70
90
120
150
ns
t
CE
(2)
CE to Output
Delay
OE = V
IL
45
55
70
90
120
150
ns
t
OE
(2)(3)
OE to Output
Delay
CE = V
IL
20
25
25
30
35
50
ns
t
DF
(4)(5)
OE or CE High to Output Float,
whichever occurred first
20
25
25
30
30
40
ns
t
OH
Output Hold from
Address, CE or OE,
whichever occurred first
7
7
7
0
0
0
ns
AT27C1024
5
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.
Pin Capacitance
(f = 1 MHz T = 25C)
(1)
Note:
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
Typ
Max
Units
Conditions
C
IN
4
10
pF
V
IN
= 0V
C
OUT
8
12
pF
V
OUT
= 0V
Input Test Waveforms and Measurement Levels
For -45 and -55
Devices Only
For -70 and slower
Devices Only
Output Test Load
Note:
C
L
= 100 pF including jig
capacitance except -45 and -55
devices, where C
L
= 30 pF.
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