Rainbow Electronics AT27C2048 User Manual
Features
•
Fast Read Access Time - 55 ns
•
Low Power CMOS Operation
– 100 µA Maximum Standby
– 35 mA Maximum Active at 5 MHz
•
JEDEC Standard Packages
– 40-Lead 600 mil PDIP
– 44-Lead PLCC
– 40-Lead VSOP (10 mm x 14 mm)
•
Direct Upgrade from 512K-bit and 1M-bit (AT27C516 and AT27C1024) EPROMs
•
5V ± 10% Power Supply
•
High Reliability CMOS Technology
– 2,000V 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
2-Megabit
(128K x 16)
OTP EPROM
Description
The AT27C2048 is a low-power, high performance 2,097,152-bit one-time programmable read only memor y (OTP EP ROM) or ganiz ed 128K by 16 bits . It re quires a single 5V power su pply i n norma l read mode o peratio n. Any word c an be a ccessed in
less than 55 ns, e liminating the need for s peed-reducin g WAIT states. The by-16
organization makes thi s par t ideal for high-pe rform ance 16 and 32 bit micr opro cess or
VCC
PGM
A16
A15
A14
A13
A12
A11
A10
A9
GND
A8
A7
A6
A5
A4
A3
A2
A1
A0
(continued)
systems.
Pin Configurations
Pin Name Function
A0 - A16 Addresses
O0 - O15 Outputs
CE
OE Output Enable
PGM
NC No Connect
DC Don’t Connect
Note: Both GND pins must be connected.
Chip Enable
Program Strobe
VSOP Top View
Type 1
PDIP Top View
1
VPP
O15
O14
O13
O12
O11
O10
GND
CE
O9
O8
O7
O6
O5
O4
O3
O2
O1
O0
OE
40
2
39
3
38
4
37
5
36
6
35
7
34
8
33
9
32
10
31
11
30
12
29
13
28
14
27
15
26
16
25
17
24
18
23
19
22
20
21
PLCC Top View
AT27C2048
A10
A11
A12
A13
A14
A15
A16
PGM
VCC
VPP
O15
O14
O13
O12
O11
O10
1
A9
2
3
4
5
6
7
8
9
10
11
12
CE
13
14
15
16
17
18
19
O9
20
O8
40
GND
39
A8
38
A7
37
A6
36
A5
35
A4
34
A3
33
A2
32
A1
31
A0
30
OE
29
O0
28
O1
27
O2
26
O3
25
O4
24
O5
23
O6
22
O7
21
GND
Note: PLCC package pins 1 and 23
are DON’T CONNECT.
O13
O14
65432
7
O12
8
O11
9
O10
10
O9
11
O8
12
GND
13
NC
14
O7
15
O6
16
O5
17
O4
1819202122232425262728
O3O2O1
O15CEVPPDCVCC
1
4443424140
A0A1A2A3A4
O0
OE
DC
PGM
A16
A15
A14
39
38
37
36
35
34
33
32
31
30
29
A13
A12
A11
A10
A9
GND
NC
A8
A7
A6
A5
Rev. 0632C–10/98
1
In read mode, the AT27C2048 typically consumes 15 mA.
Standby mode supply current is typically less than 10 µA.
The AT27C2048 is available in industry standard
JEDEC-approved one-tim e programmable (OTP) plastic
PDIP, PLCC, and VSOP packages . The device features
two-line control (CE
high-speed systems.
With high density 128K word storage capability, the
AT27C2048 allows firmware to be stored reliably and to be
accessed by the system without the delays of mass storage
media.
Atmel’s AT27C2048 has additional features that ensure
high quality and efficient productio n use. The Rapid
gramming Algorithm reduces the time required to program
the part and guarantees reliable programming. Programming time is typically only 50 µs/word. The Integrated Product Identif ication Code ele ctronica lly iden tifies the dev ice
and manufacturer. This feature is used by industr y stan-
, OE) to eliminate bus contention in
™
Pro-
Block Diagram
dard programming equipment to select the proper programming algorithms and voltages.
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may produ ce tra ns ien t vo ltag e ex cu rs i ons .
Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device
non-conforma nce. At a min imum, a 0. 1 µF high fr equency ,
low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected
between the V
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
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.
and Ground terminals of the device, as
CC
and Ground
CC
VCC
GND
VPP
OE
CE
A0 - A17
ADDRESS
INPUTS
OE, CE AND
PROGRAM LOGIC
Y DECODER
X DECODER
DATA OUTPUTS
O0 - O15
OUTPUT
BUFFERS
Y-GATING
CELL MATRIX
IDENTIFICATION
2
AT27C2048
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
Vo ltage on A9 with
Respect to Ground ......................................-2.0V to +14.0V
AT27C2048
*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-
(1)
(1)
tions 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.
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V
(1)
Note: Maximum v oltag e is -0.6 V dc whic h ma y unders hoot to -2 .0V for pulses of less than 20 ns. Maxim um out put pin voltage is VCC +
0.75V dc which may overshoot to +7.0V for pulses of less than 20 ns.
Operating Modes
Mode/Pin CE OE PGM Ai V
Read V
IL
Output Disable X V
Standby V
Rapid Program
(2)
PGM Verify V
PGM Inhibit V
Product Identification
Notes: 1. X can be V
(4)
or VIH.
IL
IH
V
IL
IL
IH
V
IL
V
IL
IH
XX X X
V
IH
V
IL
XX X VPPHigh Z
V
IL
(1)
X
Ai X
X X X High Z
V
IL
V
IH
X
Ai V
Ai V
A9 = V
(3)
H
A0 = VIH or VIL
A1 - A16 = V
IL
2. Refer to the Programming characteristics.
3. VH = 12.0 ± 0.5V.
4. Two identifier words m ay be selected. All Ai inputs are hel d low (V
) to select the Manufacturer’s Identification word and high (VIH) to select the Device Code word.
low (V
IL
), except A9, which is set to VH, and A0, which is togg le d
IL
5. Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.
V
Outputs
PP
(1)
D
OUT
(5)
High Z
D
PP
PP
CC
IN
D
OUT
Identific ation Code
DC and AC Operating Conditions for Read Operation
AT27C2048
-55 -70 -90 -12 -15
Operating
Temperature (Case)
Power Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
V
CC
Com. 0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C
Ind. -40°C - 85°C-40°C - 85°C-40°C - 85°C-40°C - 85°C-40°C - 85°C
3
DC and Operating Characteristics for Read Operation
Symbol Parameter Condition Min Max Units
I
LI
I
LO
(2)
I
PP1
I
SB
ICCVCC Active Current f = 5 MHz, I
V
IL
V
IH
V
OL
V
OH
Input Load Current VIN = 0V to V
Output Leakage Current V
(1)
V
Read/Standby Current VPP = V
PP
(1)
V
Standby Current
CC
= 0V to V
OUT
I
(CMOS)
SB1
CE
= V
I
(TTL)
SB2
CE
= 2.0 to V
CC
CC
± 0.3V
CC
CC
+ 0.5V
CC
= 0 mA, CE = V
OUT
IL
± 1 µA
± 5 µA
10 µA
100 µA
1mA
35 mA
Input Low Voltage -0.6 0.8 V
Input High Voltage 2.0 VCC + 0.5 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage I
= -400 µA2.4V
OH
Notes: 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.
AC Characteristics for Read Operat ion
AT27C2048
-55 -70 -90 -12 -15
Symbol Parameter Condition
t
t
t
t
t
ACC
CE
OE
DF
OH
(3)
(2)
(2)(3)
(4)(5)
(4)
Address to
Output Delay
CE to Output Delay OE = V
OE to Output Delay CE = V
OE or CE High to Output Float,
whichever occurred f irst
Output Hold from Address, CE or OE,
whichever occurred f irst
CE = OE
= V
IL
IL
IL
Min Max Min Max Min Max Min Max Min Max
55 70 90 120 150 ns
55 70 90 120 150 ns
20 30 35 40 50 ns
20 20 20 30 35 ns
77000ns
Note: 2, 3, 4, 5. See the AC Waveforms for Read Operation diagram.
Units
4
AT27C2048
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