ATMEL AT29C256-15PI 256k 32k x 8 5-volt only cmos flash memory Datasheet

Features
• Fast Read Access Time – 70 ns
• 5-volt Only Reprogramming
• Page Program Operation
•
•
•
•
•
•
•
•
•
– Single Cycle Reprogram (Erase and Program)
– Internal Address and Data Latches for 64 Bytes
Internal Program Control and Timer
Hardware and Software Data Protection
Fast Program Cycle Times
– Page (64 Byte) Program Time – 10 ms
– Chip Erase Time – 10 ms
DATA Polling for End of Program Detection
Low-power Dissipation
– 50 mA Active Current
– 300 µA CMOS Standby Current
Typical Endurance > 10,000 Cycles
Single 5V ± 10% Supply
CMOS and TTL Compatible Inputs and Outputs
Commercial and Industrial Temperature Ranges
256K (32K x 8)
5-volt Only
Flash Memory
AT29C256
Description
The AT29C256 is a five-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 70 ns with power dissipation of just 275 mW. When the device is
deselected, the CMOS standby current is less than 300 µA. The device endurance is
such that any sector can typically be written to in excess of 10,000 times.
TSOP Top View
Type 1
Pin Configurations
Pin Name
Function
A0 - A14
Addresses
CE
Chip Enable
OE
Output Enable
WE
Write Enable
I/O0 - I/O7
Data Inputs/Outputs
NC
No Connect
DC
Don’t Connect
OE
A11
A9
A8
A13
A14
VCC
WE
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
29
28
27
26
25
24
23
22
21
14
15
16
17
18
19
20
5
6
7
8
9
10
11
12
13
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
I/O1
I/O2
GND
DC
I/O3
I/O4
I/O5
A6
A5
A4
A3
A2
A1
A0
NC
I/O0
4
3
2
1
32
31
30
A7
A12
WE
DC
VCC
A14
A13
PLCC and LCC Top View
Note:
PLCC package pins 1 and 17 are
DON’T CONNECT.
Rev. 0046P–FLASH–10/04
1
To allow for simple in-system reprogrammability, the AT29C256 does not require high
input voltages for programming. Five-volt-only commands determine the operation of
the device. Reading data out of the device is similar to reading from a static RAM.
Reprogramming the AT29C256 is performed on a page basis; 64 bytes of data are
loaded into the device and then simultaneously programmed. The contents of the entire
device may be erased by using a six-byte software code (although erasure before programming is not needed).
During a reprogram cycle, the address locations and 64 bytes of data are internally
latched, freeing the address and data bus for other operations. Following the initiation of
a program cycle, the device will automatically erase the page and then program the
latched data using an internal control timer. The end of a program cycle can be detected
by DATA polling of I/O7. Once the end of a program cycle has been detected a new
access for a read, program or chip erase can begin.
Block Diagram
Device Operation
READ: The AT29C256 is accessed like a static RAM. When CE and OE are low and
WE is high, the data stored at the memory location determined by the address pins
is asserted on the outputs. The outputs are put in the high impedance state whenever
CE or OE is high. This dual-line control gives designers flexibility in preventing bus
contention.
BYTE LOAD: A byte load is performed by applying a low pulse on the WE or CE input
with CE or WE low (respectively) and OE high. The address is latched on the falling
edge of CE or WE, whichever occurs last. The data is latched by the first rising edge of
CE or WE. Byte loads are used to enter the 64 bytes of a page to be programmed or the
software codes for data protection and chip erasure.
2
AT29C256
0046P–FLASH–10/04
AT29C256
PROGRAM: The device is reprogrammed on a page basis. If a byte of data within a
page is to be changed, data for the entire page must be loaded into the device. Any byte
that is not loaded during the programming of its page will be indeterminate. Once the
bytes of a page are loaded into the device, they are simultaneously programmed during
the internal programming period. After the first data byte has been loaded into the
device, successive bytes are entered in the same manner. Each new byte to be programmed must have its high-to-low transition on WE (or CE) within 150 µs of the low-tohigh transition of WE (or CE) of the preceding byte. If a high-to-low transition is not
detected within 150 µs of the last low-to-high transition, the load period will end and the
internal programming period will start. A6 to A14 specify the page address. The page
address must be valid during each high-to-low transition of WE (or CE). A0 to A5 specify
the byte address within the page. The bytes may be loaded in any order; sequential
loading is not required. Once a programming operation has been initiated, and for the
duration of tWC, a read operation will effectively be a polling operation.
SOFTWARE DATA PROTECTION: A software controlled data protection feature is
available on the AT29C256. Once the software protection is enabled a software algorithm must be issued to the device before a program may be performed. The software
protection feature may be enabled or disabled by the user; when shipped from Atmel,
the software data protection feature is disabled. To enable the software data protection,
a series of three program commands to specific addresses with specific data must be
performed. After the software data protection is enabled the same three program commands must begin each program cycle in order for the programs to occur. All software
program commands must obey the page program timing specifications. Once set, the
software data protection feature remains active unless its disable command is issued.
Power transitions will not reset the software data protection feature, however the software feature will guard against inadvertent program cycles during power transitions.
Once set, software data protection will remain active unless the disable command
sequence is issued.
After setting SDP, any attempt to write to the device without the three-byte command
sequence will start the internal write timers. No data will be written to the device; however, for the duration of tWC, a read operation will effectively be a polling operation.
After the software data protection’s three-byte command code is given, a byte load is
performed by applying a low pulse on the WE or CE input with CE or WE low (respectively) and OE high. The address is latched on the falling edge of CE or WE, whichever
occurs last. The data is latched by the first rising edge of CE or WE. The 64 bytes of
data must be loaded into each sector by the same procedure as outlined in the program
section under device operation.
HARDWARE DATA PROTECTION: Hardware features protect against inadvertent
programs to the AT29C256 in the following ways: (a) VCC sense – if VCC is below 3.8V
(typical), the program function is inhibited; (b) V CC power on delay – once V CC has
reached the VCC sense level, the device will automatically time out 5 ms (typical) before
programming; (c) Program inhibit – holding any one of OE low, CE high or WE high
inhibits program cycles; and (d) Noise filter – pulses of less than 15 ns (typical) on the
WE or CE inputs will not initiate a program cycle.
3
0046P–FLASH–10/04
PRODUCT IDENTIFICATION: The product identification mode identifies the device
and manufacturer and may be accessed by a hardware operation. For details, see
Operating Modes or Product Identification.
DATA POLLING: The AT29C256 features DATA polling to indicate the end of a program cycle. During a program cycle an attempted read of the last byte loaded will result
in the complement of the loaded data on I/O7. Once the program cycle has been completed, true data is valid on all outputs and the next cycle may begin. DATA polling may
begin at any time during the program cycle.
TOGGLE BIT: In addition to DATA polling the AT29C256 provides another method for
determining the end of a program or erase cycle. During a program or erase operation,
successive attempts to read data from the device will result in I/O6 toggling between
one and zero. Once the program cycle has completed, I/O6 will stop toggling and valid
data will be read. Examining the toggle bit may begin at any time during a program
cycle.
OPTIONAL CHIP ERASE MODE: The entire device can be erased by using a six-byte
software code. Please see Software Chip Erase application note for details.
Absolute Maximum Ratings*
Temperature Under Bias................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
All Input Voltages (including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to VCC + 0.6V
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum 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 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.
Voltage on OE
with Respect to Ground ...................................-0.6V to +13.5V
4
AT29C256
0046P–FLASH–10/04
AT29C256
DC and AC Operating Range
Operating
Temperature (Case)
Com.
Ind.
VCC Power Supply
Note:
AT29C256-70
AT29C256-90
AT29C256-12
AT29C256-15
0°C - 70°C
0°C - 70°C
0°C - 70°C
0°C - 70°C
-40°C - 85°C
-40°C - 85°C
-40°C - 85°C
-40°C - 85°C
5V ± 5%
5V± 10%
5V± 10%
5V± 10%
Not recommended for New Designs.
Operating Modes
Mode
Read
Program
(2)
5V Chip Erase
Standby/Write Inhibit
CE
OE
WE
Ai
I/O
VIL
VIL
VIH
Ai
DOUT
VIL
VIH
VIL
Ai
DIN
VIL
VIH
VIL
Ai
X
(1)
VIH
X
X
Write Inhibit
X
X
VIH
Write Inhibit
X
VIL
X
Output Disable
X
VIH
X
VIL
VH(3)
VIL
X
VIL
VIL
VIH
A1-A14 = VIL, A9 = VH, A0 = VIL
Manufacturer Code(4)
A1-A14 = VIL, A9 = VH, A0 = VIH
Device Code(4)
High Voltage Chip Erase
High Z
High Z
High Z
Product Identification
Hardware
Software(5)
Notes:
1.
2.
3.
4.
5.
A0 = VIL
Manufacturer Code(4)
A0 = VIH
Device Code(4)
X can be VIL or VIH.
Refer to AC Programming Waveforms.
VH = 12.0V ± 0.5V.
Manufacturer Code: 1F, Device Code: DC.
See details under Software Product Identification Entry/Exit.
DC Characteristics
Symbol
Parameter
Condition
ILI
Input Load Current
ILO
Min
Max
Units
VIN = 0V to VCC
10
µA
Output Leakage Current
VI/O = 0V to VCC
10
µA
ISB1
VCC Standby Current CMOS
CE = VCC - 0.3V to VCC
300
µA
ISB2
VCC Standby Current TTL
CE = 2.0V to VCC
3
mA
ICC
VCC Active Current
f = 5 MHz; IOUT = 0 mA
50
mA
VIL
Input Low Voltage
0.8
V
VIH
Input High Voltage
VOL
Output Low Voltage
IOL = 2.1 mA
VOH1
Output High Voltage
IOH = -400 µA
2.4
V
VOH2
Output High Voltage CMOS
IOH = -100 µA; VCC = 4.5V
4.2
V
2.0
V
0.45
V
5
0046P–FLASH–10/04
AC Read Characteristics
Symbol
Parameter
tACC
AT29C256-70
AT29C256-90
AT29C256-12
AT29C256-15
Min
Min
Min
Min
Max
Max
Max
Max
Units
Address to Output Delay
70
90
120
150
ns
(1)
CE to Output Delay
70
90
120
150
ns
tOE(2)
OE to Output Delay
0
40
0
40
0
50
0
70
ns
tDF(3)(4)
CE or OE to Output Float
0
25
0
25
0
30
0
40
ns
tOH
Output Hold from OE, CE or Address,
whichever occurred first
0
tCE
Note:
0
0
0
ns
Not recommended for New Designs.
AC Read Waveforms(1)(2)(3)(4)
Notes:
6
1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC.
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change
without impact on tACC.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
AT29C256
0046P–FLASH–10/04
AT29C256
Input Test Waveforms and Measurement Level
tR, tF < 5 ns
Output Test Load
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Symbol
Typ
Max
Units
Conditions
CIN
4
6
pF
VIN = 0V
COUT
8
12
pF
VOUT = 0V
Note:
1. This parameter is characterized and is not 100% tested.
7
0046P–FLASH–10/04
AC Byte Load Characteristics
Symbol
Parameter
Min
Max
Units
tAS, tOES
Address, OE Set-up Time
0
ns
tAH
Address Hold Time
50
ns
tCS
Chip Select Set-up Time
0
ns
tCH
Chip Select Hold Time
0
ns
tWP
Write Pulse Width (WE or CE)
90
ns
tDS
Data Set-up Time
35
ns
tDH,tOEH
Data, OE Hold Time
0
ns
tWPH
Write Pulse Width High
100
ns
AC Byte Load Waveforms
WE Controlled
CE Controlled
8
AT29C256
0046P–FLASH–10/04
AT29C256
Program Cycle Characteristics
Symbol
Parameter
Min
Max
Units
tWC
Write Cycle Time
10
ms
tAS
Address Set-up Time
0
ns
tAH
Address Hold Time
50
ns
tDS
Data Set-up Time
35
ns
tDH
Data Hold Time
0
ns
tWP
Write Pulse Width
90
ns
tBLC
Byte Load Cycle Time
tWPH
Write Pulse Width High
150
100
µs
ns
Program Cycle Waveforms(1)(2)(3)
Notes:
1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE).
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the page being programmed will be indeterminate.
9
0046P–FLASH–10/04
Software Data Protection
Enable Algorithm(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
WRITES ENABLED(2)
LOAD DATA 80
TO
ADDRESS 5555
ENTER DATA
PROTECT STATE
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (64 BYTES)(4)
Notes:
Software Data Protection
Disable Algorithm(1)
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of program cycle.
3. Data Protect state will be deactivated at end of program period.
4. 64 bytes of data MUST BE loaded.
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
EXIT DATA
PROTECT STATE(3)
LOAD DATA
TO
PAGE (64 BYTES)(4)
Software Protected Program Cycle Waveform(1)(2)(3)
Notes:
10
1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE) after the software code has
been entered.
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the page being programmed will be indeterminate.
AT29C256
0046P–FLASH–10/04
AT29C256
Data Polling Characteristics(1)
Symbol
Parameter
tDH
Data Hold Time
0
ns
tOEH
OE Hold Time
10
ns
tOE
OE to Output Delay(2)
tWR
Write Recovery Time
Notes:
Min
Typ
Max
Units
ns
0
ns
1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Data Polling Waveforms
Toggle Bit Characteristics(1)
Symbol
Parameter
tDH
Data Hold Time
tOEH
OE Hold Time
Min
OE to Output Delay
tOEHP
OE High Pulse
tWR
Write Recovery Time
Notes:
Max
Units
0
ns
10
ns
(2)
tOE
Typ
ns
150
ns
0
ns
1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Toggle Bit Waveforms(1)(2)(3)
Notes:
1. Toggling either OE or CE or both OE and CE will operate toggle bit.
2. Beginning and ending state of I/O6 will vary.
3. Any address location may be used but the address should not vary.
11
0046P–FLASH–10/04
Software Product Identification Entry(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 90
TO
ADDRESS 5555
LOAD DATA F0
TO
ADDRESS 5555
PAUSE 10 mS
Notes:
12
Software Product Identification Exit(1)
ENTER PRODUCT
IDENTIFICATION
MODE(2)(3)(5)
PAUSE 10 mS
EXIT PRODUCT
IDENTIFICATION
MODE(4)
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. A1 - A14 = VIL.
Manufacturer Code is read for A0 = VIL;
Device Code is read for A0 = VIH.
3. The device does not remain in identification mode if
powered down.
4. The device returns to standard operation mode.
5. Manufacturer Code is 1F. The Device Code is DC.
AT29C256
0046P–FLASH–10/04
AT29C256
NORMALIZED SUPPLY CURRENT
vs. TEMPERATURE
1.4
N
O
R
M
A
L
I
Z
E
D
1.3
1.2
1.1
1.0
I
0.9
C
C
0.8
-55
-25
5
35
65
95
125
TEMPERATURE (C)
NORMALIZED SUPPLY CURRENT
vs. ADDRESS FREQUENCY
1.1
N
O
R
M 1.0
A
L
I
0.9
Z
E
D
I
C
C
VCC = 5V
T = 25C
0.8
0.7
0
1
2
3
4
5
6
7
FREQUENCY (MHz)
NORMALIZED SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.4
N
O
R
M 1.2
A
L
I
1.0
Z
E
D
I
C
C
0.8
0.6
4.50
4.75
5.00
5.25
5.50
SUPPLY VOLTAGE (V)
13
0046P–FLASH–10/04
Ordering Information
ICC (mA)
tACC
(ns)
Active
Standby
Ordering Code
Package
70
50
0.3
AT29C256-70JC
AT29C256-70TC
32J
28T
Commercial
(0° to 70°C)
AT29C256-70JI
AT29C256-70TI
32J
28T
Industrial
(-40° to 85°C)
AT29C256-90JC
AT29C256-90TC
32J
28T
Commercial
(0° to 70°C)
AT29C256-90JI
AT29C256-90TI
32J
28T
Industrial
(-40° to 85°C)
AT29C256-12JC
AT29C256-12TC
32J
28T
Commercial
(0° to 70°C)
AT29C256-12JI
AT29C256-12TI
32J
28T
Industrial
(-40° to 85°C)
AT29C256-15JC
AT29C256-15TC
32J
28T
Commercial
(0° to 70°C)
AT29C256-15JI
AT29C256-15TI
32J
28T
Industrial
(-40° to 85°C)
90
120
150
Note:
50
50
50
0.3
0.3
0.3
Operation Range
Not recommended for New Designs.
Package Type
32J
32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
28T
28-lead, Plastic Thin Small Outline Package (TSOP)
14
AT29C256
0046P–FLASH–10/04
AT29C256
Packaging Information
32J – PLCC
1.14(0.045) X 45˚
PIN NO. 1
IDENTIFIER
1.14(0.045) X 45˚
0.318(0.0125)
0.191(0.0075)
E1
E2
B1
E
B
e
A2
D1
A1
D
A
0.51(0.020)MAX
45˚ MAX (3X)
COMMON DIMENSIONS
(Unit of Measure = mm)
D2
Notes:
1. This package conforms to JEDEC reference MS-016, Variation AE.
2. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is .010"(0.254 mm) per side. Dimension D1
and E1 include mold mismatch and are measured at the extreme
material condition at the upper or lower parting line.
3. Lead coplanarity is 0.004" (0.102 mm) maximum.
SYMBOL
MIN
NOM
MAX
A
3.175
–
3.556
A1
1.524
–
2.413
A2
0.381
–
–
D
12.319
–
12.573
D1
11.354
–
11.506
D2
9.906
–
10.922
E
14.859
–
15.113
E1
13.894
–
14.046
E2
12.471
–
13.487
B
0.660
–
0.813
B1
0.330
–
0.533
e
NOTE
Note 2
Note 2
1.270 TYP
10/04/01
R
2325 Orchard Parkway
San Jose, CA 95131
TITLE
32J, 32-lead, Plastic J-leaded Chip Carrier (PLCC)
DRAWING NO.
REV.
32J
B
15
0046P–FLASH–10/04
28T – TSOP
PIN 1
0º ~ 5º
c
Pin 1 Identifier Area
D1 D
L
b
e
L1
A2
E
A
GAGE PLANE
SEATING PLANE
COMMON DIMENSIONS
(Unit of Measure = mm)
A1
MIN
NOM
MAX
A
–
–
1.20
A1
0.05
–
0.15
A2
0.90
1.00
1.05
D
13.20
13.40
13.60
D1
11.70
11.80
11.90
Note 2
E
7.90
8.00
8.10
Note 2
L
0.50
0.60
0.70
SYMBOL
Notes:
1. This package conforms to JEDEC reference MO-183.
2. Dimensions D1 and E do not include mold protrusion. Allowable
protrusion on E is 0.15 mm per side and on D1 is 0.25 mm per side.
3. Lead coplanarity is 0.10 mm maximum.
L1
NOTE
0.25 BASIC
b
0.17
0.22
0.27
c
0.10
–
0.21
e
0.55 BASIC
12/06/02
R
16
2325 Orchard Parkway
San Jose, CA 95131
TITLE
28T, 28-lead (8 x 13.4 mm) Plastic Thin Small Outline
Package, Type I (TSOP)
DRAWING NO.
REV.
28T
C
AT29C256
0046P–FLASH–10/04
Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 487-2600
Regional Headquarters
Europe
Atmel Sarl
Route des Arsenaux 41
Case Postale 80
CH-1705 Fribourg
Switzerland
Tel: (41) 26-426-5555
Fax: (41) 26-426-5500
Asia
Room 1219
Chinachem Golden Plaza
77 Mody Road Tsimshatsui
East Kowloon
Hong Kong
Tel: (852) 2721-9778
Fax: (852) 2722-1369
Japan
9F, Tonetsu Shinkawa Bldg.
1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
Tel: (81) 3-3523-3551
Fax: (81) 3-3523-7581
Atmel Operations
Memory
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 436-4314
RF/Automotive
Theresienstrasse 2
Postfach 3535
74025 Heilbronn, Germany
Tel: (49) 71-31-67-0
Fax: (49) 71-31-67-2340
Microcontrollers
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel: 1(408) 441-0311
Fax: 1(408) 436-4314
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