Memoria Eprom 27256 CRTL PQ Sol
Memoria Eprom 27256 CRTL PQ Sol
Memoria Eprom 27256 CRTL PQ Sol
1
2
3
4
5
6
7
VPP
A12
A7
A6
A5
A4
A3
8
9
10
11
12
13
14
27C256
A10
CE
D7
D6
D5
D4
D3
21
20
19
18
17
16
15
VSS
D2
D1
D0
A0
A1
A2
30
31
32
A7
A12
VPP
NU
Vcc
A14
A13
3
29
28
27
8
9
10
11
26
25
24
23
A8
A9
A11
NC
OE
A10
CE
O7
O6
20
19
18
17
21
16
22
13
15
12
DIP/SOIC
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
27C256
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3
VSOP
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
27C256
14
A6
A5
A4
A3
A2
A1
A0
NC
O0
DESCRIPTION
The Microchip Technology Inc. 27C256 is a CMOS
256K bit electrically Programmable Read Only Memory
(EPROM). The device is organized as 32K words by 8
bits (32K bytes). Accessing individual bytes from an
address transition or from power-up (chip enable pin
going low) is accomplished in less than 90 ns. This very
high speed device allows the most sophisticated microprocessors to run at full speed without the need for
WAIT states. CMOS design and processing enables
this part to be used in systems where reduced power
consumption and reliability are requirements.
28
27
26
25
24
23
22
PLCC
27C256
O1
O2
VSS
NU
O3
O4
O5
FEATURES
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CE
O7
O6
O5
O4
O3
VSS
O2
O1
O0
A0
A1
A2
DS11001L-page 1
27C256
1.0
ELECTRICAL CHARACTERISTICS
1.1
Maximum Ratings*
TABLE 1-1:
Name
Function
A0-A14
CE
Chip Enable
OE
Output Enable
VPP
Programming Voltage
O0 - O7
VCC
VSS
Ground
NC
NU
TABLE 1-2:
Address Inputs
Data Output
Parameter
Tamb = 0C to +70C
Tamb = -40C to +85C
Tamb = -40C to +125C
Part*
Status
Symbol
Min.
Max.
Units
Conditions
Input Voltages
all
Logic "1"
Logic "0"
VIH
VIL
2.0
-0.5
VCC+1
0.8
V
V
Input Leakage
all
ILI
-10
10
VIN = 0 to VCC
Output Voltages
all
Logic "1"
Logic "0"
VOH
VOL
2.4
0.45
V
V
IOH = -400 A
IOL = 2.1 mA
Output Leakage
all
ILO
-10
10
VOUT = 0V to VCC
Input Capacitance
all
CIN
pF
Output Capacitance
all
COUT
12
pF
C
I,E
TTL input
TTL input
ICC1
ICC2
20
25
mA
mA
C
I, E
all
TTL input
TTL input
CMOS input
ICC(S)
2
3
100
mA
mA
A
all
all
Read Mode
Read Mode
IPP
VPP
100
VCC
A
V
VCC-0.7
CE = VCC 0.2V
VPP = 5.5V
Note 1: Typical active current increases .75 mA per MHz up to operating frequency for all temperature ranges.
DS11001L-page 2
27C256
TABLE 1-3:
Sym
Units Conditions
Min
Max
Min
Max
Min
Max
Min
Max Min
Max
Address to Output
Delay
tACC
90
100
120
150
200
ns
CE=OE =VIL
CE to Output Delay
tCE
90
100
120
150
200
ns
OE = VIL
OE to Output Delay
tOE
40
45
55
65
75
ns
CE = VIL
CE or OE to O/P
High Impedance
tOFF
30
30
35
50
55
ns
tOH
ns
* -10, -90 AC Testing Waveform: VIH = 2.4V and VIL = .45V; VOH = 1.5V and VOL = 1.5V
Output Load: 1 TTL Load + 30pF
FIGURE 1-1:
READ WAVEFORMS
VIH
Address Valid
Address
VIL
VIH
CE
VIL
t CE(2)
VIH
OE
VIL
Outputs
O0 - O7
VOH
t OFF(1,3)
t OH
t OE(2)
High Z
Valid Output
High Z
VOL
t ACC
DS11001L-page 3
27C256
TABLE 1-4:
PROGRAMMING DC CHARACTERISTICS
Ambient Temperature: Tamb = 25C 5C
VCC = 6.5V 0.25V, VPP = VH = 13.0V 0.25V
Parameter
Status
Symbol
Min
Max.
Units
Input Voltages
Logic1
Logic0
VIH
VIL
2.0
-0.1
VCC+1
0.8
V
V
Input Leakage
ILI
-10
10
VIN = 0V to VCC
Logic1
Logic0
VOH
VOL
2.4
0.45
V
V
IOH = -400 A
IOL = 2.1 mA
ICC2
20
mA
Note 1
IPP2
25
mA
Note 1
A9 Product Identification
VH
11.5
12.5
Output Voltages
Conditions
Note 1: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP
TABLE 1-5:
PROGRAMMING AC CHARACTERISTICS
Parameter
Min.
Max.
Units
tAS
tDS
tDH
tAH
tDF
130
ns
tVCS
tPW
95
105
CE Set-Up Time
tCES
OE Set-Up Time
tOES
tVPS
tOE
100
ns
Remarks
100 s typical
Note 1: For express algorithm, initial programming width tolerance is 100 s 5%.
2: This parameter is only sampled and not 100% tested. Output float is defined as the point where data is no
longer driven (see timing diagram).
DS11001L-page 4
27C256
FIGURE 1-2:
PROGRAMMING WAVEFORMS
Program
Verify
VIH
Address
Address Stable
VIL
t AS
t AH
VIH
High Z
Data
Data Stable
VIL
t DS
t DH
13.0V(2)
VPP
tVPS
5.0V
6.5V(2)
VCC
tVCS
5.0V
VIH
CE
VIL
t OES
t PW
VIH
OE
t OE
(1)
VIL
Notes:
TABLE 1-6:
(1) t DF and tOE are characteristics of the device but must be accommodated by the programmer
(2) VCC = 6.5 V 0.25V, VPP = V H = 13.0V 0.25V for express algorithm
MODES
Operation Mode
CE
OE
VPP
A9
O0 - O7
Read
VIL
VIL
VCC
DOUT
Program
VIL
VIH
VH
DIN
Program Verify
VIH
VIL
VH
DOUT
Program Inhibit
VIH
VIH
VH
High Z
Standby
VIH
VCC
High Z
Output Disable
VIL
VIH
VCC
High Z
Identity
VIL
VIL
VCC
VH
Identity Code
X = Dont Care
1.2
Read Mode
DS11001L-page 5
27C256
1.3
Standby Mode
1.4
Output Enable
1.5
Windowed products offer the ability to erase the memory array. The memory matrix is erased to the all 1s
state when exposed to ultraviolet light. To ensure complete erasure, a dose of 15 watt-second/cm2 is
required. This means that the device window must be
placed within one inch and directly underneath an ultraviolet lamp with a wavelength of 2537 Angstroms,
intensity of 12,000W/cm2 for approximately 20 minutes.
1.6
Programming Mode
1.7
Verify
After the array has been programmed it must be verified to ensure all the bits have been correctly programmed. This mode is entered when all the following
conditions are met:
a)
b)
c)
d)
1.8
Inhibit
When programming multiple devices in parallel with different data, only CE need be under separate control to
each device. By pulsing the CE line low on a particular
device, that device will be programmed; all other
devices with CE held high will not be programmed with
the data, although address and data will be available on
their input pins.
1.9
Identity Mode
Pin
Identity
Manufacturer
Device Type*
Input
Output
H
e
x
A0
0 O O O O O O O
7 6 5 4 3 2 1 0
VIL
VIH
0 0 1 0 1 0 0 1 29
1 0 0 0 1 1 0 0 8C
DS11001L-page 6
27C256
FIGURE 1-3:
Start
Verify
Byte
Pass
Fail
No
X = 10 ?
Last
Address?
Yes
Device
Failed
Yes
No
Increment Address
Device
Passed
Yes
All
bytes
= original
data?
No
Device
Failed
DS11001L-page 7
27C256
NOTES:
DS11001L-page 8
27C256
NOTES:
DS11001L-page 9
27C256
NOTES:
DS11001L-page 10
27C256
27C256 Product Identification System
To order or to obtain information (e.g., on pricing or delivery), please use listed part numbers, and refer to factory or listed sales offices.
27C256
90
/TS
Package:
Temperature
Range:
Access
Time:
Device
L
P
SO
TS
VS
=
=
=
=
=
Blank = 0C to +70C
I = -40C to +85C
E = -40C to +125C
90
10
12
15
20
27C256
=
=
=
=
=
90 ns
100 ns
120 ns
150 ns
200 ns
256K (32K x 8) CMOS EPROM
DS11001L-page 11
ASIA/PACIFIC
EUROPE
Corporate Office
Microchip Technology Inc.
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 602 786-7200 Fax: 602 786-7277
Technical Support: 602 786-7627
Web: http://www.microchip.com
Atlanta
Microchip Technology Inc.
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: 770 640-0034 Fax: 770 640-0307
Boston
Microchip Technology Inc.
5 Mount Royal Avenue
Marlborough, MA 01752
Tel: 508 480-9990 Fax: 508 480-8575
Chicago
Microchip Technology Inc.
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 708 285-0071 Fax: 708 285-0075
Dallas
Microchip Technology Inc.
14651 Dallas Parkway, Suite 816
Dallas, TX 75240-8809
Tel: 972 991-7177 Fax: 972 991-8588
Dayton
Microchip Technology Inc.
Suite 150
Two Prestige Place
Miamisburg, OH 45342
Tel: 513 291-1654 Fax: 513 291-9175
Los Angeles
Microchip Technology Inc.
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 714 263-1888 Fax: 714 263-1338
New York
Microchip Technmgy Inc.
150 Motor Parkway, Suite 416
Hauppauge, NY 11788
Tel: 516 273-5305 Fax: 516 273-5335
San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408 436-7950 Fax: 408 436-7955
Toronto
Microchip Technology Inc.
5925 Airport Road, Suite 200
Mississauga, Ontario L4V 1W1, Canada
Tel: 905 405-6279 Fax: 905 405-6253
China
Microchip Technology
Unit 406 of Shanghai Golden Bridge Bldg.
2077 Yanan Road West, Hongiao District
Shanghai, Peoples Republic of China
Tel: 86 21 6275 5700
Fax: 011 86 21 6275 5060
Hong Kong
Microchip Technology
RM 3801B, Tower Two
Metroplaza
223 Hing Fong Road
Kwai Fong, N.T. Hong Kong
Tel: 852 2 401 1200 Fax: 852 2 401 3431
India
Microchip Technology
No. 6, Legacy, Convent Road
Bangalore 560 025 India
Tel: 91 80 526 3148 Fax: 91 80 559 9840
Korea
Microchip Technology
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku,
Seoul, Korea
Tel: 82 2 554 7200 Fax: 82 2 558 5934
Singapore
Microchip Technology
200 Middle Road
#10-03 Prime Centre
Singapore 188980
Tel: 65 334 8870 Fax: 65 334 8850
Taiwan, R.O.C
Microchip Technology
10F-1C 207
Tung Hua North Road
Taipei, Taiwan, ROC
Tel: 886 2 717 7175 Fax: 886 2 545 0139
United Kingdom
Arizona Microchip Technology Ltd.
Unit 6, The Courtyard
Meadow Bank, Furlong Road
Bourne End, Buckinghamshire SL8 5AJ
Tel: 44 1628 850303 Fax: 44 1628 850178
France
Arizona Microchip Technology SARL
Zone Industrielle de la Bonde
2 Rue du Buisson aux Fraises
91300 Massy - France
Tel: 33 1 69 53 63 20 Fax: 33 1 69 30 90 79
Germany
Arizona Microchip Technology GmbH
Gustav-Heinemann-Ring 125
D-81739 Muenchen, Germany
Tel: 49 89 627 144 0 Fax: 49 89 627 144 44
Italy
Arizona Microchip Technology SRL
Centro Direzionale Colleone Pas Taurus 1
Viale Colleoni 1
20041 Agrate Brianza
Milan Italy
Tel: 39 39 6899939 Fax: 39 39 689 9883
JAPAN
Microchip Technology Intl. Inc.
Benex S-1 6F
3-18-20, Shin Yokohama
Kohoku-Ku, Yokohama
Kanagawa 222 Japan
Tel: 81 45 471 6166 Fax: 81 45 471 6122
9/3/96
DS11001L-page 12