ATMEL AT34C02N-10SI-2.7, AT34C02N-10SI-1.8, AT34C02N-10SI, AT34C02N-10SC-2.7, AT34C02N-10SC-1.8 Datasheet

...
Features
Permanent Software Write Protection for the First-Half of the Array
– Software Procedure to Verify Write Protect Status
Hardware Write Protection for the Entire Array
– 5.0 (VCC = 4.5V to 5.5V) – 2.7 (VCC = 2.7V to 5.5V) – 1.8 (VCC = 1.8V to 5.5V)
Internally Organized 256 x 8
2-Wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
100 KHz (1.8V and 2.7V) and 400 KHz (5.0V) Compatibility
16-Byte Page Wri te Modes
Partial Page Writes Are Allowed
Self-Timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles – Data Retention: 100 Years – ESD Protection: >3,000V
Automotive Grade and Extended Temperature Devices Available
8-Pin PDIP, 8-Pin JEDEC SOIC and 8-Pin TSSOP Packages
Description
The AT34C02 provides 2048 bits of serial electrically erasable and programmable read only memory ( EEPRO M ) or gan iz ed as 25 6 wo rds of 8 bi ts ea ch . The fi rst- hal f o f the device incorporates a software write protection feature while hardware write pro­tection for the entire array is available via an external pin as well. Once the software write protection is enabled, by s end ing a special comm and t o the device, it ca nnot b e reversed. The hardware write protection is controlled with the WP pin and can be used to protect the entire array, whether or not the software write protection has been enabled. This allows the user to protect none, first-half, or all of the array depending on the applica tion . The device is opti mi zed for u se in ma ny i nd us tri al a nd c om mer cial applications where low power and low voltage operations are essential. The AT34C02 is available in space sa ving 8-pin PDIP, 8-pi n JEDEC SOIC, and 8-pin TSSO P pack­ages and is accessed via a 2-wire se rial interface. In addition, it is av ailable in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V), and 1.8V (1.8V to 5.5V) versions.
2-Wire Serial EEPROM with Permanent Software Write Protect
2K (256 x 8)
AT34C02
2-Wire Serial
Pin Configurations
Pin Name Function
A0 to A2 Address Inputs SDA Serial Data SCL Serial Clock Input WP Write Protect
8-Pin TSSOP
A0 A1 A2
GND
1 2 3 4
8 7 6 5
VCC WP SCL SDA
A0 A1 A2
GND
GND
A0 A1 A2
8-Pin SOIC
1 2 3 4
8-Pin PDIP
1 2 3 4
EEPROM with
VCC
8
WP
7
SCL
6
SDA
5
Permanent Software Write Protec
8
VCC
7
WP
6
SCL
5
SDA
Rev. 0958D–07/98
1
Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125 °C
Storage Temperature.....................................-65°C to +150°C
Voltage on Any Pin
with Respect to Ground.....................................-1.0V to +7.0V
Maximum Operating Voltage........................................... 6.25V
DC Output Current........................................................5.0 mA
Block Diagram
V
CC
GND WP
SCL SDA
A
2
A
1
A
0
START
STOP
LOGIC
LOAD
DEVICE
ADDRESS
COMPARATOR
R/W
*NOTICE: Stresses beyond those listed under “Absolute
SERIAL
CONTROL
WRITE PROTECT
CIRCUITRY
COMP
DATA WORD
ADDR/COUNTER
LOGIC
INCLOAD
Maximum Ratings” may cause permanent dam­age to the de vic e. T his is a stres s rat ing onl y and functional oper a tion of the device at these o r any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximu m rating conditions f or ex tended periods ma y aff ect dev ice reliability.
EN
H.V. PUMP/TIMING
DATA RECOVERY
SOFTWARE WRITE PROTECTED AREA
(00H - 7FH)
X DEC
2
E
PROM
D
IN
D
OUT
Pin Description
SERIAL CLOCK (SCL):
edge clock data into each EEPROM device and negative edge clock data out of each device.
SERIAL DATA (SDA):
serial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open collector devices.
2
The SCL input is used to positive
The SDA pin is bidirectional for
AT34C02
Y DEC
DEVICE/PAGE ADDRESSES (A2 , A1, A0):
SERIAL MUX
D
/ACK
OUT
LOGIC
The A2, A1 and A0 pins are device address inputs that are hard wired for the AT34C02. As many as eight 2K devices may be addressed on a single bus system (device addressin g is discussed in detail under the Device Addressing section).
WRITE PROTECT (WP):
The AT34C02 has a Write Pro­tect pin that provides hardware data protection. The Write Protect pin allows normal read/write operations when con-
AT34C02
nected to ground (GND) or when left floating. When the Write Protect pin is connected to V
, the write protection
CC
feature is enabled for the entire array. The write protection modes are shown in the following table.
AT34C02 Write Protection Modes
WP Pin Status Write Protect Register Part of the Array Write Protected
V
CC
Full Array (2K)
GND or Floating Not Programmed Normal Read/Write
GND or Floating Programmed
Pin Capacitance
(1)
First-Half of Array
(1K: 00H - 7FH)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V
Symbol Test Condition Max Units Conditions
C
I/O
C
IN
Input/Output Capacitance (SDA) 8 pF V Input Capacitance (A0, A1, A2, SCL) 6 pF VIN = 0V
Note: 1. This parameter is characterized and is not 100% tested
I/O
= 0V
DC Characteristics
Applicable over recommended operating range from: TAI = -40°C to +85°C, V
= +1.8V to +5.5V (unless otherwise noted).
V
CC
Symbol Parameter Test Condition Min Typ Max Units
V
CC1
V
CC2
V
CC3
I
CC
I
CC
I
SB1
I
SB2
I
SB3
I
LI
I
LO
V
IL
V
IH
V
OL2
V
OL1
Note: 1. VIL min and VIH max are reference only and are not tested.
Supply Voltage 1.8 5.5 V Supply Voltage 2.7 5.5 V Supply Voltage 4.5 5.5 V Supply Current VCC = 5.0V READ at 100 KHz 0.4 1.0 mA Supply Current VCC = 5.0V WRITE at 100 KHz 2.0 3.0 mA Standby Current VCC = 1.8V VIN = VCC or V Standby Current VCC = 2.7V VIN = VCC or V Standby Current VCC = 5.0V VIN = VCC or V Input Leakage Current VIN = VCC or V Output Leakage Current V Input Low Level Input High Level
(1)
(1)
OUT
= V
CC
or V
SS
SS
SS
SS
SS
Output Low Level VCC = 3.0V IOL = 2.1 mA 0.4 V Output Low Level VCC = 1.8V IOL = 0.15 mA 0.2 V
= +1.8V to +5.5V, TAC = 0°C to +70°C,
CC
0.6 3.0
1.6 4.0
8.0 18.0
0.10 3.0
0.05 3.0
-0.6 VCC x 0.3 V
VCC x 0.7 VCC + 0.5 V
A
µ
A
µ
A
µ
A
µ
A
µ
3
AC Characteristics
Applicable over recommended operating range from TA = -40°C to +85°C, VCC = +1.8V to +5.5V,
= 1 TTL Gate and 100 pF (unless otherwise noted).
C
L
1.8V, 2.7V 5.0V
Symbol Parameter
f
SCL
t
LOW
t
HIGH
t
I
t
AA
t
BUF
t
HD.STA
t
SU.STA
t
HD.DAT
t
SU.DAT
t
R
t
F
t
SU.STO
t
DH
t
WR
Endurance
Note: 1. This parameter is characterized and is not 100% tested.
(1)
Clock Frequency, SCL 100 400 kHz Clock Pulse Width Low 4.7 1.2 Clock Pulse Width High 4.0 0.6 Noise Suppression Time Clock Low to Data Out Valid 0.1 4.5 0.1 0.9 Time the bus must be free before a new transmission can start Start Hold Time 4.0 0.6 Start Set-up Time 4.7 0.6 Data In Hold Time 0 0 Data In Set-up Time 200 100 ns Inputs Rise Time Inputs Fall Time Stop Set-up Time 4.7 0.6 Data Out Hold Time 100 50 ns Write Cycle Time 10 10 ms
5.0V, 25°C, Page Mode 1M 1M
(1)
(1)
(1)
UnitsMinMaxMinMax
µ
s
µ
s
100 50 ns
µ
s
(1)
4.7 1.2
1.0 0.3
300 300 ns
µ
s
µ
s
µ
s
µ
s
µ
s
µ
s
Write
Cycles
Memory Organization
AT34C02, 2K Serial EEPROM:
nized with 256 pages of 1 byte each. Random word addressing requires a 8-bit data word address.
The 2K is internally orga-
Device Operation
CLOCK and DATA TRANSITIONS:
mally pulled high with an external de vice . Data on th e SDA pin may chan ge only dur ing SC L lo w ti me p eri ods (re fer to Data Validity timing diagram). Data changes during SCL high periods will indicate a start or stop condition as defined below.
START CONDITION:
A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (refer to Start and Stop Definition timing dia­gram).
STOP CONDITION:
A low-to-high transition of SDA with
SCL high is a stop condition. After a read sequence, the
4
AT34C02
The SDA pin is nor-
stop command will pla ce the EEP ROM in a stan dby power mode (refer to Start and Stop Definition timing diagram).
ACKNOWLEDGE:
All addresses and data words are seri­ally transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a z ero to acknowledge that it has received each word. This happens during the ninth clock cycle.
STANDBY MODE:
The AT34C02 features a low power standby mode which is enabled: (a) up on power-up or (b) after the receipt of th e STO P bit and th e co mpleti on of any internal operations.
MEMORY RESET:
After an interruption in protocol, power loss or system reset, any 2-wire part can be reset by follow­ing these steps:
(a) Clock up to 9 cycles, (b) look for SDA high in each cycle while SCL is high and then (c) create a start condition as SDA is high.
Bus Timing SCL: Serial Clock SDA: Ser ial Data I/O
Write Cycle Timing SCL: Serial Clock SDA: Serial Data I/O
AT34C02
(1)
Note: 1. The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the internal clear/write
cycle.
5
Data Validity
Start and Stop Condition
Output Acknowledge
6
AT34C02
AT34C02
Device Addressing
The 2K EEPROM device requires an 8-bit device address word following a start condition to enable the chip for a read or write operation (refer to Figure 2).
The device address word consists of a mandatory one-zero sequence for the first four most-significant bits (1010) for normal read and write operations and 0110 for writing to the write protect register.
The next 3 bits are the A2, A1 and A0 device address bits for the AT34C02 EEPROM. These 3 bits must compare to their corresponding hard-wired input pins.
The eighth bit of the device address is the read/write opera­tion select bit. A read operation is initiated if this bit is high and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a zero. If a compare is no t mad e, th e chip will return to a standby state. The de vice will not ackno wledge i f the write protect register has been programmed and the control code is 0110.
Write Operations
BYTE WRITE:
word address following the device address word and acknowledgmen t. Upon receipt of this address, the EEPROM will again respond with a zero and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM wi ll output a zero and the addre ssing device, such as a mi crocon troller, must ter minate the write sequence with a stop condition. At this time the EEPROM enters an internally-timed write cycle, t memory. All in puts ar e disa bled du ring thi s writ e cycle and the EEPROM will not respond until the write is complete (refer to Figure 3).
The device will acknowledge a write c ommand, but not write the data, if the software or hardware write protection has been enabled. The write cycle time must be observed even when the write protection is enabled.
PAGE WRITE:
write. A page write is ini tiated th e sa me as a byte write, but the
microcontroller does not send a stop condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcon­troller can transmit up to fifteen more data words. The EEPROM will respond with a zero after each data word received. The m icrocontroll er must termin ate the page write sequence with a stop condition (refer to Figure 4).
A write operation requires an 8-bit data
, to the nonvolatile
WR
The 2K device is capable of 16-byte page
The data word address lower four bits are internally incre­mented following the re ce ip t of e ac h d ata w or d. Th e hi ghe r data word address bits ar e not increm ented, retain ing the memory page row location. When the word address, inter­nally generated, reaches the page boundary, the following byte is placed at the beginning of the sa me page. If more than sixteen data words are transmitted to the EEPROM, the data word address will “roll ov er” and prev ious data will be overwritten. The address “roll over” during write is from the last byte of the current page to the first byte of the same page.
The device will acknowledge a wri te command, but not write the data, if the software or hardware write protection has been enabled. The write cycle time must be observed even when the write protection is enabled.
ACKNOWLEDGE POLLING:
write cycle has started and the EEPROM inputs are dis ­abled, acknowledge polling can be initiated. This involves sending a start condition followed by the device address word. The read/write bit is repres entative of the op eration desired. Only if the internal write cycle ha s completed will the EEPROM respond with a zero allowing the read or write sequence to continue.
Once the internally-timed
Write Protection
The software write protection, once enabled, permanently write protects only the first-half of the array (00H - 7FH) while the hardware write protection, via the WP pin, is used to protect the entire array.
SOFTWARE WRITE PROTECTION:
protection is enabled by sending a com mand, similar to a normal write command, to the dev ice which pr ograms the write protect regi ster. This must be don e with the WP pin low. The write protect re gister i s pr ogr am me d by s en din g a write command with the devic e address of 0110 ins tead of 1010 with the addres s and data bit be ing d on’t car es (r efer to Figure 1). Once the software write protectio n has been enabled, the device will no longer acknowledge the 0110 control byte. The software write protection cannot be reversed even if the device is powered down. The write cycle time must be observed.
HARDWARE WRITE PROTECTION:
connected to V pin to V whether or not the software write protection has been enabled. The software write protection regi ster cannot be programmed when the WP pin is connected to V WP pin is connected to GND or left floating, the write pro­tection mode is determined by the status of the software write protect register.
will write protect the entir e array, regardless of
CC
, GND, or left floating. Connecting the WP
CC
The software write
The WP pin can be
. If the
CC
7
WP Connected to GND or Floating
Acknowledgment
Start R/W Bit Write Protect Register
1010 R X ACK Read Array 1010 W Programmed ACK Can Write to First Half Only 1010 W Not Programmed ACK Can Write to Full Array 0110 R Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 R Not Programmed ACK Read Out Data Don’t Care. Indicates WP Register is Not Prog 0110 W Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 W Not Programmed ACK Program Write Protect Register (irreversible)
WP Connected to V
1010 R X ACK Read Array 1010 W Programmed ACK Device Write Protect 1010 W Not Programmed ACK Device Write Protect 0110 R Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 R Not Programmed ACK Read Out Data Don’t Care. Indicates WP Register is Not Prog 0110 W Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 W Not Programmed ACK Cannot Program Write Protect Register
CC
from Device Action from Device
Figure 1.
Setting Write Protect Register
S T A R T
SDA LINE
CONTROL
BYTE
0110 0
A
C
K
Read Operations
Read operations are initiated the same way as write opera­tions with t he exce ption th at t he read/w rite sel ect b it in t he device address word is set to on e. There a re three read operations: current address read, random address read and sequential read.
CURRENT ADDRES S READ:
address counter maintains the last address accessed dur­ing the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. T he address “ro ll over” during read is from the last byte of the last memory page to the first byte of the first page.
Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out. To end
The internal data word
WORD
ADDRESS DATA
A C K
A C K
S
T O P
the command, the microcontroller does not respond with an input zero but does generate a following stop condition (refer to Figure 5).
RANDOM READ:
A random read requi res a “dummy” byte write sequence to load i n the data w ord a ddress . Onc e the device address word and dat a wor d add re ss ar e cl oc ke d in and acknowledge d by the EEPROM , the micro controller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the r ead/write sel ect bit hi gh. The E EPROM acknowledges the device address and serially clocks out the data word. To end the command, the microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 6).
8
AT34C02
AT34C02
SEQUENTIAL READ:
either a current address read or a random address read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will “roll over” and the sequential read will con­tinue. The sequential read operation is termin ated when
Figure 2.
Figure 3.
Device Address
Byte Write
Sequential reads are initiated by
the microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 7).
WRITE PROTECT REGISTER STATUS:
register has been program med, the same procedure is used as to program the register except that the R/W bit is set to 1. If the device ackn owledge s, then the wri te protect register has not been pr ogrammed. Otherwi se, it has be en programmed and the devi ce is perma nen tly wr ite p rotec ted at the first half of the array.
To find out if the
Figure 4.
Figure 5.
Page Write
Current Address Read
9
Figure 6.
Random Read
Figure 7.
Sequential Read
10
AT34C02
Ordering Information
tWR (max)
(ms)
10 3000 18 400 AT34C02-10PC
10 1500 4 100 AT34C02-10PC-2.7
10 800 3 100 AT34C02-10PC-1.8
ICC (max)
(µA)
3000 18 400 AT34C02-10PI
1500 4 100 AT34C02-10PI-2.7
800 3 100 AT34C02-10PI-1.8
ISB (max)
(µA)
f
MAX
(kHz) Ordering Code Package Operation Range
AT34C02N-10SC AT34C02-10TC
AT34C02N-10SI AT34C02-10TI
AT34C02N-10SC-2.7 AT34C02-10TC-2.7
AT34C02N-10SI-2.7 AT34C02-10TI-2.7
AT34C02N-10SC-1.8 AT34C02-10TC-1.8
AT34C02N-10SI-1.8 AT34C02-10TI-1.8
AT34C02
8P3 8S1 8T
8P3 8S1 8T
8P3 8S1 8T
8P3 8S1 8T
8P3 8S1 8T
8P3 8S1 8T
Commercial
(0°C to 70°C)
Industrial
(-40°C to 85°C)
Commercial
(0°C to 70°C)
Industrial
(-40°C to 85°C)
Commercial
(0°C to 70°C)
Industrial
(-40°C to 85°C)
Package Type
8P3 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) 8S1 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline Package(JEDEC SOIC) 8T 8-Lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP)
Options
Blank Standard Operation (4.5V to 5.5V)
-2.7 Low Voltage (2.7V to 5.5V)
-1.8 Low Voltage (1.8V to 5.5V)
11
Packaging Information
8P3
, 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) Dimensions in Inches and (Millimeters)
.400 (10.16) .355 (9.02)
PIN
1
.280 (7.11) .240 (6.10)
.037 (.940)
.300 (7.62) REF
.210 (5.33) MAX
SEATING
PLANE
.150 (3.81) .115 (2.92)
.012 (.305) .008 (.203)
.070 (1.78) .045 (1.14)
.027 (.690)
.100 (2.54) BSC
.015 (.380) MIN
.022 (.559) .014 (.356)
.325 (8.26) .300 (7.62)
0
REF
15
.430 (10.9) MAX
8S1
, 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC) Dimensions in Inches and (Millimeters)
.020 (.508) .013 (.330)
.244 (6.20) .228 (5.79)
.068 (1.73) .053 (1.35)
.010 (.254) .007 (.203)
PIN 1
0 8
.157 (3.99) .150 (3.81)
.050 (1.27) BSC
.196 (4.98) .189 (4.80)
.010 (.254) .004 (.102)
REF
.050 (1.27) .016 (.406)
8T
, 8-Lead, 0.170" Wide, Thin Shrink Small Outline Package (TSSOP) Dimensions in Millimeters and (Inches)
PIN 1
6.50 (.256)
6.25 (.246)
0.30 (.012)
0.19 (.008)
3.10 (.122)
0
REF
8
2.90 (.114)
0.15 (.006)
0.05 (.002)
4.5 (.177)
4.3 (.169)
0.75 (.030)
0.45 (.018)
1.20 (.047) MAX
0.20 (.008)
0.09 (.004)
1.05 (.041)
0.80 (.033)
.65 (.026) BSC
12
AT34C02
Loading...