Rainbow Electronics AT27C512R User Manual
Features
•
Fast Read Access Time - 45 ns
•
Low-Power CMOS Operation
µµµµ
– 100
A max. Standby
– 20 mA max. Active at 5 MHz
•
JEDEC Standard Packages
– 28-Lead 600-mil 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
•
CMOS and TTL Compatible Inputs and Outputs
•
Integrated Product Identification Code
•
Commercial, Industrial and Automotive Temperature Ranges
µµµµ
s/byte (typical)
Description
The AT27C512R is a low- pow er , high- pe rf orman ce 524,288-bit one-time pro gramm able read only memory (OTP EPROM) organized 64K by 8 bits. It requires only one 5V
power supply in norm al read mo de operat ion. Any byt e can be acc essed in less than
45 ns, eliminating the n eed for speed reducing WAIT s tates on high-pe rformance
microprocessor systems.
Atmel’s scaled CMOS te chnol ogy prov ides hi gh-spee d, lo wer acti ve powe r consum ption, and significantly faster programming. Power consumption is typically only 8 mA
in Active Mode and less than 10 µA in Standby.
(continued)
Pin Configurations
Pin Name Function
A0 to A15 Addresses
O0 - O7 Outputs
CE
OE
/VPP Output Enable/VPP
NC No Connect
PLCC Top View
5
A6
6
A5
7
A4
8
A3
9
A2
10
A1
11
A0
12
NC
13
O0
Note: PLCC Package Pins 1 and
17 are DON’T CONNECT.
Chip Enable
A7
A12
A15NCVCC
A14
432
1
323130
14151617181920
O1
O2
O3O4O5
NC
GND
A13
29
28
27
26
25
24
23
22
21
A8
A9
A11
NC
OE/VPP
A10
CE
O7
O6
OE/VPP
PDIP, SOIC Top View
1
A15
2
A12
3
A7
4
A6
5
A5
6
A4
7
A3
8
A2
9
A1
10
A0
11
O0
12
O1
13
O2
14
GND
TSOP Top View
22
A11
23
A9
24
A8
25
A13
26
A14
27
VCC
28
1
A15
2
A12
3
A7
4
A6
5
A5
6
A4
7
A3
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Type 1
VCC
A14
A13
A8
A9
A11
OE/VPP
A10
CE
O7
O6
O5
O4
O3
21
A10
20
CE
19
O7
18
O6
17
O5
16
O4
15
O3
14
GND
13
O2
12
O1
11
O0
10
A0
9
A1
8
A2
512K (64K x 8)
OTP EPROM
AT27C512R
512K EPROM
Rev. 0015I–07/98
1
The AT27C512 R is ava ilable in a c hoice of indu stry st andard JEDEC-approved one-time programmable (OTP)
plastic PDIP, PLCC, S OIC, and TSOP packages . All
devices feature two-line c ontrol ( CE
the flexibility to prevent bus contention.
With 64K byte storage capability, the AT27C512R allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.
Atmel’s 27C512R has addit ional features to ensure high
quality and efficient production use. The Rapid
ming Algori thm reduc es the time require d to prog ram the
part and guarantees reliable programming. Programming
time is typically only 100 µs/byte. The Integrated Product
Identification Code electronica lly identifi es the devic e and
manufacturer. This feature is used by industry standard
programming equi pmen t to se lect the prop er progr ammi ng
algorithms and voltages.
, OE) to give designe rs
™
Program-
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-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
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
2
AT27C512R
Block Diagram
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
Voltage on A9 with
Respect to Ground .....................................-2.0V to + 14.0V
VPP Supply Voltage with
Respect to Ground ......................................-2.0V to + 14.0V
AT27C512R
*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
(1)
(1)
Note: 1 . Minimum voltage is -0.6V dc which ma y unde rshoot
(1)
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.
to -2.0V for pulses of less than 20 ns. Maximum
output pin voltage is V
+ 0.75V dc which may
CC
oversh oot to +7.0 volts f or pu lses of les s than 20 ns .
Operating Modes
Mode\Pin CE OE/V
Read V
Output Disable V
Standby V
Rapid Program
(2)
PGM Inhibit V
Product Identification
(4)
Notes: 1. X can be VIL or VIH.
2. Refer to Programming Characteristics.
= 12.0 ± 0.5V.
3. V
H
4. T wo identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggle d low
(V
) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.
IL
IL
IL
IH
V
IL
IH
V
IL
PP
V
IL
V
IH
(1)
X
V
PP
V
PP
V
IL
Ai Outputs
Ai D
(1)
X
X High Z
Ai D
(1)
X
(3)
A9 =V
H
A0 = VIH or VIL
A1 - A15 = V
IL
OUT
High Z
IN
High Z
Identification Code
3
DC and AC Operating Conditions for Read Operation
AT27C512R
-45 -55 -70 -90 -12 -15
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
Operating
Temp.(Case)
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
Auto. -40°C - 125°C-40°C - 125°C-40°C - 125°C-40°C - 125°C
V
Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
CC
DC and Operating Characteristics for Read Operation
Symbol Parameter Condition Min Max Units
I
LI
Input Load Current VIN = 0V to V
CC
Com., Ind, ±1 µA
Auto. ±5 µA
I
LO
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
Output Leakage
Current
(1)
V
Standby
CC
Current
VCC Active Current f = 5 MHz, I
V
= 0V to V
OUT
(CMOS), CE = V
I
SB1
I
(TTL), CE = 2.0 to V
SB2
CC
= 0 mA, CE = V
OUT
0.3V 100 µA
±
CC
0.5V 1 mA
+
CC
IL
Input Low Voltage -0.6 0.8 V
Input High Vo ltage 2.0 VCC + 0.5 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage IOH = -400 µA2.4V
Com., Ind, ±5 µA
Auto. ±10 µA
20 mA
Notes: 1. VCC must be applied simultaneously with or before OE/VPP, and removed simultaneously with or after OE/VPP..
AC Characteristics for Read Operat ion
AT27C512R
-45 -55 -70 -90 -12 -15
Symbol Parameter Condition
(3)
t
t
t
t
t
ACC
CE
OE
DF
OH
Address to Output Delay CE= OE/VPP = V
(2)
CE to Output Delay OE/VPP = V
(2)(3)
OE/VPP to Output Delay CE = V
(4)(5)
OE/V
or CE High to Output Float, whichever
PP
occurred first
Output Hold from Address, CE or OE/VPP,
whichever occurred first
IL
IL
Notes: 2, 3, 4, 5. - see AC Waveforms for Read Operation.
Min Max Min Max Min Max Min Max Min Max Min Max
IL
45 55 70 90 120 150 ns
45 55 70 90 120 150 ns
20 25 30 35 35 40 ns
20 20 25 25 30 35 ns
777000ns
Units
4
AT27C512R
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