Rainbow Electronics AT27C800 User Manual
Features
•
Read Access Time - 90 ns
•
Word-wide or Byte-wide Configurable
•
8-Megabit Flash and Mask ROM Compatable
•
Low Power CMOS Operation
–100 µA Maximum Standby
– 50 mA Maximum Active at 5 MHz
•
Wide Selection of JEDEC Standard Packages
– 42-Lead 600 mil PDIP
– 44-Lead PLCC
– 44-Lead SOIC (SOP)
– 48-Lead TSOP (12 mm x 20 mm)
±±±±
•
5V
10% Power Supply
•
High Reliability CMOS Technology
– 2,000 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
8-Megabit
(512K x 16 or
1024K x 8)
OTP EPROM
Description
The AT27C800 is a low-power, high performance 8,388,608-bit UV erasable programmable read only memory (EPROM) organized as either 512K by 16 or 1024K by 8
(continued)
Pin Configurations
Pin Name Function
A0 - A18 Addresses
O0 - O15 Outputs
O15/A-1 Output/Address
BYTE
/VPP
Byte Mode/
Program Supp ly
CE Chip Enable
OE Output Enable
NC No Connect
TSOP
Type 1
1
A15
2
A14
3
A13
4
A12
5
A11
6
A10
7
A9
8
A8
9
NC
10
NC
11
NC
12
NC
13
NC
14
NC
15
NC
16
A18
17
A17
18
A7
19
A6
20
A5
21
A4
22
A3
23
A2
24
A1
PDIP Top View
1
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
O0
O8
O1
O9
O2
O10
O3
O11
48
A16
47
BYTE/VPP
46
GND
45
O15/A-1
44
O7
43
O14
42
O6
41
O13
40
O5
39
O12
38
O4
37
VCC
36
O11
35
O3
34
O10
33
O2
32
O9
31
O1
30
O8
29
O0
28
OE
27
GND
26
CE
25
A0
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
NC
A8
A9
A10
A11
A12
A13
A14
A15
A16
BYTE/VPP
GND
O15/A-1
O7
O14
O6
O13
O5
O12
O4
VCC
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
PLCC Top View
A5A6A7
A17
65432
7
A4
8
A3
9
A2
10
A1
11
A0
12
CE
13
GND
14
OE
15
O0
16
O8
17
O1
1819202122232425262728
O9
O2
O10O3O11
Note: PLCC Package Pin 23 is
DON’T CONNECT.
NC
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
O0
O8
O1
O9
O2
O10
O3
O11
A18NCNCA8A9
1
4443424140
O4
NC
VCC
SOIC (SOP)
1
44
2
43
3
42
4
41
5
40
6
39
7
38
8
37
9
36
10
35
11
34
12
33
13
32
14
31
15
30
16
29
17
28
18
27
19
26
20
25
21
24
22
23
A10
A11
39
A12
38
A13
37
A14
36
A15
35
A16
34
BYTE/VPP
33
GND
32
O15/A-1
31
O7
30
O14
29
O6
O12O5O13
NC
NC
A8
A9
A10
A11
A12
A13
A14
A15
A16
BYTE/VPP
GND
O15/A-1
O7
O14
O6
O13
O5
O12
O4
VCC
AT27C800
Rev. 0801B–10/98
1
bits. It requires a single 5V power supply in normal read
mode operation. Any word can be accessed in less than 90
ns, eliminating th e need for speed -reducing WAIT states .
The x16 organ ization makes th is par t ideal for high -perfor mance 16- and 32-bit microprocessor systems.
The AT27C800 can be organized as either word-wide or
byte-wide. The org anizatio n is se lected v ia the B YTE
/V
PP
pin. When BYTE/VPP is asserted high (VIH), the word-wide
organization is sele cted and the O15/A-1 pi n is used for
O15 data output. When BYTE
/VPP is asserted low (VIL),the
byte wide organization is se lected and the O 15/A-1 pin is
used for the address pin A-1. When the AT27C800 is logically regarded as x16 (word-wide), but read in the bytewide mode, then with A-1=V
bit word are selected with A-1 =V
the lower eight bits of the 16
IL
the upper 8 bits of the
IH
16-bit word are selected.
In read mode, the AT27C800 typically consumes 15 mA.
Standby mode supply current is typically less than 10 µA.
The AT27C800 is available in industry standard JEDEC-
approved one -time prog rammable ( OTP) PLCC , PDIP,
SOIC (SOP), and TSOP a s well as UV er asab le win dowed
Cerdip packages. The device features two-line control(CE
,OE) to eliminate bus contention in high-speed sys-
tems.
With high den sity 51 2K word o r 1 024K -bit stor age capa bil-
ity, the AT27C800 allows firmware to be to be stored reliably and to be accessed by the system without the delays
of mass storage media.
Atmel’s AT27C800 has additional features that ensure high
quality and effic ient p roducti on us e. The Rapid
TM
Programming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 50µs/word. The Integrated Prod uct
Identification Code electronically ide ntifies the device and
manufacturer. This feature is used by industry standard
programming eq uipme nt to sele ct the prop er program ming
equipment 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 transients may exceed data sheet limits, resulting in device
non-conforman ce. At a mini mum, 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
Block Diagram
2
AT27C800
Absolute Maximum Ratings*
Temperature Under Bias................................-55°C to +125°C
Storage Temperature..................................... -65°C to +150°C
Voltage on Any Pin with
with Respect to Ground..................................-2.0V to +7.0V
Voltage on A9 with
Respect to Ground ......................................-2.0V to +14.0V
AT27C800
*NOTICE: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage to the device. This i s a s tress rating only a nd
functional opera tion of the devic e a t thes e o r any
(1)
(1)
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions f or e xtended p eriods ma y aff ect de vice
reliability .
VPP 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
Vcc + 0.75V DC which may overshoot to + 7.0V for pulses of less than 20 ns.
Operating Modes
Outputs
Mode\Pin CE OE Ai BYTE/V
Read Word-wide V
Read Byte -wide Upper V
Read Byte -wide Lower V
Output Disable X
Standby V
Rapid Program
(2)
IL
IL
IL
(1)
IH
V
IL
PGM Verify X V
PGM Inhibit V
Product Identification
Notes: 1 . X can be V
(4)
or V
IL
IH.
IH
V
IL
V
IL
V
IL
V
IL
V
IH
(1)
X
V
IH
IL
V
IH
V
IL
(1)
X
(1)
X
(1)
X
(1)
X
(1)
X
Ai V
Ai V
(1)
X
A9 = V
(3)
H
A0 = VIH or V
A1 - A18 = V
IL
IL
2. Refer to the programming characteristics tables in this data sh eet.
3. VH = 12.0 ± 0.5V.
4. Two identifier words may be selected. All Ai inputs are held low (VIL) except A9,which is set to VH, and A0, which is toggled
low (V
) to select the Manufacturer’s Identification word and high (VIH) to select the Device Code word.
IL
5. Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in I
PP
V
IH
V
IL
V
IL
XHigh Z
(5)
X
PP
PP
V
PP
V
IH
O
D
D
D
0-O7
OUT
OUT
OUT
O8-O
D
High Z V
High Z V
High Z
D
High Z
Identification Code
.
SB
D
OUT
IN
OUT
14
O15/A-1
D
OUT
IH
IL
3
DC and AC Operating Conditions for Read Operation
AT27C800
-90 -10 -12 -15
Operating
Temperature (Case)
Com.
Ind.
0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C
-40°C - 85°C -40°C - 85°C -40°C - 85°C-40°C - 85°C
VCC Power Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
DC and Operating Characteristics for Read Operation
Symbol Parameter Condition Min Max Units
I
LI
I
LO
(2)
I
PP1
I
SB
V
IL
V
IH
V
OL
V
OH
Notes: 1. VCC must be applied simultaneously or before VPP, and removed simultaneously or after VPP.
Input Load Current VIN = 0V to V
Output Leakage Current V
(1)
V
Read/Standby Current VPP= V
PP
(1)
V
Standby Current
CC
V
Active Current f = 5MHz, I
CC
= 0V to V
OUT
CC
(CMOS), CE = VCC ± 0.3V 100 µA
I
SB1
I
(TTL), CE = 2.0 to V
SB2
OUT
CC
CC
CC
= 0 mA,CE = V
+ 0.5V 1.0 mA
IL
±1.0 µA
±5.0 µA
±10 µA
50 mA
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 mA 2.4 V
2. VPP may be connected directly to VCC except during programming. The supply current would then be the sum of I
CC
and IPP.
AC Characteristics for Read Operat ion
Symbol Parameter Condition
(3)
t
t
t
t
t
t
t
ACC
CE
OE
DF
OH
ST
STD
(2)
(2,3)
(4,5)
(4)
Address to Output Delay CE = OE = V
CE to Output Delay OE = V
OE to Output Delay CE = V
IL
IL
OE or CE High to Output Float, whichever
occured first
Output Hold from Address CE or OE,
whichever occured first
BYTE High to Output Va lid 90 100 120 150 ns
BYTE Low to Output Transition 40 40 50 60 ns
Note: 2,3,4,5. See the AC Waveforms for Read Operation diagram.
Min Max Min Max Min Max Min Max
IL
5.0 5.0 5.0 5.0 ns
AT27C800
-90 -10 -12 -15
Units
90 100 120 150 ns
90 100 120 150 ns
40 40 40 50 ns
30 30 35 40 ns
Preliminary Information
4
AT27C800
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