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M24256-B M24128-B
256Kbit and 128Kbit Serial IC Bus EEPROM With Three Chip Enable Lines
FEATURES SUMMARY 2 s Compatible with I C Extended Addressing
s
Figure 1. Packages
Two Wire I C Serial Interface Supports 400 kHz Protocol Single Supply Voltage: - 4.5V to 5.5V for M24xxx-B - 2.5V to 3.6V for M24xxx-BV - 2.5V to 5.5V for M24xxx-BW - 1.8V to 5.5V for M24xxx-BR - 1.8V to 3.6V for M24xxx-BS
2
s
8 1
PDIP8 (BN)
s s s s s s s
Hardware Write Control BYTE and PAGE WRITE (up to 64 Bytes) RANDOM and SEQUENTIAL READ Modes Self-Timed Programming Cycle Automatic Address Incrementing Enhanced ESD/Latch-Up Behavior More than 100,000 Erase/Write Cycles - More than 1 Million Erase/Write cycles for the products specified in Table 22
8 1
SO8 (MN) 150 mil width
s
More than 40 Year Data Retention
TSSOP8 (DW) 169 mil width
November 2002
1/25
M24256-B, M24128-B
SUMMARY DESCRIPTION These I2C-compatible electrically erasable programmable memory (EEPROM) devices are organized as 32K x 8 bits (M24256-B) and 16K x 8 bits (M24128-B). Figure 2. Logic Diagram
VCC
following the bus master's 8-bit transmission. When data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a Stop condition after an Ack for Write, and after a NoAck for Read. Power On Reset: V CC Lock-Out Write Protect In order to prevent data corruption and inadvertent write operations during power up, a Power On Reset (POR) circuit is included. The internal reset is held active until VCC has reached the POR threshold value, and all operations are disabled - the device will not respond to any command. In the same way, when V CC drops from the operating voltage, below the POR threshold value, all operations are disabled and the device will not respond to any command. A stable and valid V CC must be applied before applying any logic signal. When the power supply is turned on, V CC rises from VSS to VCC(min), passing through a value Vth in between. The -V and -S versions of the device, the M24xxx-BV and M24xxx-BS, ignore all instructions until a time delay of tPU has elapsed after the moment that V CC rises above the Vth threshold. However, the correct operation of the device is not guaranteed if, by this time, VCC is still below VCC(min). No instructions should be sent until the later of: - tPU after V CC passed the Vth threshold - VCC passed the VCC(min) level These values are specified in Table 14.
3 E0-E2 SCL WC M24256-B M24128-B SDA
VSS
AI02809
Table 1. Signal Names
E0, E1, E2 SDA SCL WC VCC VSS Chip Enable Serial Data Serial Clock Write Control Supply Voltage Ground
Figure 3. DIP, SO and TSSOP Connections
These devices are compatible with the I2C memory protocol. This is a two wire serial interface that uses a bi-directional data bus and serial clock. The devices carry a built-in 4-bit Device Type Identifier code (1010) in accordance with the I2C bus definition. The device behaves as a slave in the I2C protocol, with all memory operations synchronized by the serial clock. Read and Write operations are initiated by a Start condition, generated by the bus master. The Start condition is followed by a Device Select Code and RW bit (as described in Table 2), terminated by an acknowledge bit. When writing data to the memory, the device inserts an acknowledge bit during the 9th bit time,
M24256-B M24128-B E0 E1 E2 VSS 1 2 3 4 8 7 6 5
AI02810B
VCC WC SCL SDA
Note: 1. See page 19 (onwards) for package dimensions, and how to identify pin-1.
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M24256-B, M24128-B
SIGNAL DESCRIPTION Serial Clock (SCL) This input signal is used to strobe all data in and out of the device. In applications where this signal is used by slave devices to synchronize the bus to a slower clock, the bus master must have an open drain output, and a pull-up resistor must be connected from Serial Clock (SCL) to VCC. (Figure 4 indicates how the value of the pull-up resistor can be calculated). In most applications, though, this method of synchronization is not employed, and so the pull-up resistor is not necessary, provided that the bus master has a push-pull (rather than open drain) output. Serial Data (SDA) This bi-directional signal is used to transfer data in or out of the device. It is an open drain output that may be wire-OR'ed with other open drain or open collector signals on the bus. A pull up resistor must be connected from Serial Data (SDA) to V CC. (Figure 4 indicates how the value of the pull-up resistor can be calculated).
Chip Enable (E0, E1, E2) These input signals are used to set the value that is to be looked for on the three least significant bits (b3, b2, b1) of the 7-bit Device Select Code. These inputs must be tied to V CC or VSS, to establish the Device Select Code. Write Control (WC) This input signal is useful for protecting the entire contents of the memory from inadvertent write operations. Write operations are disabled to the entire memory array when Write Control (WC) is driven High. When unconnected, the signal is internally read as VIL, and Write operations are allowed. When Write Control (WC) is driven High, Device Select and Address bytes are acknowledged, Data bytes are not acknowledged.
Figure 4. Maximum R L Value versus Bus Capacitance (CBUS) for an I2C Bus
VCC 20 Maximum RP value (k) 16 RL 12 8 4 0 10 100 CBUS (pF)
AI01665
RL
SDA MASTER fc = 100kHz fc = 400kHz SCL CBUS
CBUS 1000
3/25
M24256-B, M24128-B
Figure 5. I2C Bus Protocol
SCL
SDA SDA Input SDA Change
START Condition
STOP Condition
SCL
1
2
3
7
8
9
SDA
MSB
ACK
START Condition
SCL
1
2
3
7
8
9
SDA
MSB
ACK
STOP Condition
AI00792B
Table 2. Device Select Code
Device Type Identifier1 b7 Device Select Code 1 b6 0 b5 1 b4 0 Chip Enable Address2 b3 E2 b2 E1 b1 E0 RW b0 RW
Note: 1. The most significant bit, b7, is sent first. 2. E0, E1 and E2 are compared against the respective external pins on the memory device.
Table 3. Most Significant Byte
b15 b14 b13 b12 b11 b10 b9 b8
Table 4. Least Significant Byte
b7 b6 b5 b4 b3 b2 b1 b0
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M24256-B, M24128-B
DEVICE OPERATION The device supports the I2C protocol. This is summarized in Figure 5. Any device that sends data on to the bus is defined to be a transmitter, and any device that reads the data to be a receiver. The device that controls the data transfer is known as the bus master, and the other as the slave device. A data transfer can only be initiated by the bus master, which will also provide the serial clock for synchronization. The M24xxx-B device is always a slave in all communication. Start Condition Start is identified by a falling edge of Serial Data (SDA) while Serial Clock (SCL) is stable in the High state. A Start condition must precede any data transfer command. The device continuously monitors (except during a Write cycle) Serial Data (SDA) and Serial Clock (SCL) for a Start condition, and will not respond unless one is given. Stop Condition Stop is identified by a rising edge of Serial Data (SDA) while Serial Clock (SCL) is stable and driven High. A Stop condition terminates communication between the device and the bus master. A Read command that is followed by NoAck can be followed by a Stop condition to force the device into the Stand-by mode. A Stop condition at the end of a Write command triggers the internal EEPROM Write cycle. Acknowledge Bit (ACK) The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter, whether it be bus master or slave device, releases Serial Data (SDA) after sending eight bits of data. During the 9th clock pulse period, the receiver pulls Serial
Data (SDA) Low to acknowledge the receipt of the eight data bits. Data Input During data input, the device samples Serial Data (SDA) on the rising edge of Serial Clock (SCL). For correct device operation, Serial Data (SDA) must be stable during the rising edge of Serial Clock (SCL), and the Serial Data (SDA) signal must change only when Serial Clock (SCL) is driven Low. Memory Addressing To start communication between the bus master and the slave device, the bus master must initiate a Start condition. Following this, the bus master sends the Device Select Code, shown in Table 2 (on Serial Data (SDA), most significant bit first). The Device Select Code consists of a 4-bit Device Type Identifier, and a 3-bit Chip Enable "Address" (E2, E1, E0). To address the memory array, the 4bit Device Type Identifier is 1010b. Up to eight memory devices can be connected on a single I2C bus. Each one is given a unique 3-bit code on the Chip Enable (E0, E1, E2) inputs. When the Device Select Code is received on Serial Data (SDA), the device only responds if the Chip Enable Address is the same as the value on the Chip Enable (E0, E1, E2) inputs. The 8th bit is the Read/Write bit (RW). This bit is set to 1 for Read and 0 for Write operations. If a match occurs on the Device Select code, the corresponding device gives an acknowledgment on Serial Data (SDA) during the 9 th bit time. If the device does not match the Device Select code, it deselects itself from the bus, and goes into Standby mode.
Table 5. Operating Modes
Mode Current Address Read Random Address Read 1 Sequential Read Byte Write Page Write
Note: 1. X = VIH or VIL.
RW bit 1 0
WC 1 X X
Bytes 1 1
Initial Sequence START, Device Select, RW = 1 START, Device Select, RW = 0, Address reSTART, Device Select, RW = 1
X X VIL VIL 1 1
1 0 0
Similar to Current or Random Address Read START, Device Select, RW = 0
64
START, Device Select, RW = 0
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M24256-B, M24128-B
Figure 6. Write Mode Sequences with WC=1 (data write inhibited)
WC ACK BYTE WRITE DEV SEL ACK ACK NO ACK DATA IN
BYTE ADDR R/W
BYTE ADDR
WC ACK PAGE WRITE DEV SEL ACK ACK NO ACK DATA IN 1 DATA IN 2
START
BYTE ADDR R/W
BYTE ADDR
WC (cont'd) NO ACK PAGE WRITE (cont'd) NO ACK
START
DATA IN N
STOP
STOP
AI01120C
Write Operations Following a Start condition the bus master sends a Device Select Code with the RW bit reset to 0. The device acknowledges this, as shown in Figure 7, and waits for two address bytes. The device responds to each address byte with an acknowledge bit, and then waits for the data byte. Writing to the memory may be inhibited if Write Control (WC) is driven High. Any Write instruction with Write Control (WC) driven High (during a period of time from the Start condition until the end of the two address bytes) will not modify the memory contents, and the accompanying data bytes are not acknowledged, as shown in Figure 6. Each data byte in the memory has a 16-bit (two byte wide) address. The Most Significant Byte (Table 3) is sent first, followed by the Least Significant Byte (Table 4). Bits b15 to b0 form the address of the byte in memory. When the bus master generates a Stop condition immediately after the Ack bit (in the "10 th bit" time
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slot), either at the end of a Byte Write or a Page Write, the internal memory Write cycle is triggered. A Stop condition at any other time slot does not trigger the internal Write cycle. During the internal Write cycle, Serial Data (SDA) is disabled internally, and the device does not respond to any requests. Byte Write After the Device Select code and the address bytes, the bus master sends one data byte. If the addressed location is Write-protected, by Write Control (WC) being driven High, the device replies with NoAck, and the location is not modified. If, instead, the addressed location is not Write-protected, the device replies with Ack. The bus master terminates the transfer by generating a Stop condition, as shown in Figure 7. Page Write The Page Write mode allows up to 64 bytes to be written in a single Write cycle, provided that they are all located in the same 'row' in the memory: that is, the most significant memory address bits
M24256-B, M24128-B
(b14-b6 for M24256-B, and b13-b6 for M24128-B) are the same. If more bytes are sent than will fit up to the end of the row, a condition known as `rollover' occurs. This should be avoided, as data starts to become overwritten in an implementation dependent way. The bus master sends from 1 to 64 bytes of data, each of which is acknowledged by the device if Write Control (WC) is Low. If Write Control (WC) is High, the contents of the addressed memory location are not modified, and each data byte is followed by a NoAck. After each byte is transferred, the internal byte address counter (the 6 least significant address bits only) is incremented. The transfer is terminated by the bus master generating a Stop condition.
Figure 7. Write Mode Sequences with WC=0 (data write enabled)
WC ACK BYTE WRITE DEV SEL ACK ACK DATA IN ACK
BYTE ADDR R/W
BYTE ADDR
WC ACK PAGE WRITE DEV SEL ACK ACK DATA IN 1 ACK DATA IN 2
START
BYTE ADDR R/W
BYTE ADDR
WC (cont'd)
START
ACK PAGE WRITE (cont'd) DATA IN N
ACK
STOP
STOP
AI01106C
7/25
M24256-B, M24128-B
Figure 8. Write Cycle Polling Flowchart using ACK
WRITE Cycle in Progress
START Condition DEVICE SELECT with RW = 0
NO First byte of instruction with RW = 0 already decoded by the device
ACK Returned YES
NO
Next Operation is Addressing the Memory
YES
ReSTART
Send Address and Receive ACK
STOP
NO
START Condition
YES
DATA for the WRITE Operation
DEVICE SELECT with RW = 1
Continue the WRITE Operation
Continue the Random READ Operation
AI01847C
Minimizing System Delays by Polling On ACK During the internal Write cycle, the device disconnects itself from the bus, and writes a copy of the data from its internal latches to the memory cells. The maximum Write time (tw) is shown in Tables 20 and 21, but the typical time is shorter. To make use of this, a polling sequence can be used by the bus master. The sequence, as shown in Figure 8, is: - Initial condition: a Write cycle is in progress.
- Step 1: the bus master issues a Start condition followed by a Device Select Code (the first byte of the new instruction). - Step 2: if the device is busy with the internal Write cycle, no Ack will be returned and the bus master goes back to Step 1. If the device has terminated the internal Write cycle, it responds with an Ack, indicating that the device is ready to receive the second part of the instruction (the first byte of this instruction having been sent during Step 1).
8/25
M24256-B, M24128-B
Figure 9. Read Mode Sequences
ACK CURRENT ADDRESS READ START DEV SEL R/W NO ACK DATA OUT STOP ACK
ACK RANDOM ADDRESS READ START DEV SEL * R/W
ACK DEV SEL * START
ACK
NO ACK DATA OUT STOP ACK
BYTE ADDR
BYTE ADDR
R/W
ACK SEQUENTIAL CURRENT READ START DEV SEL R/W
ACK
ACK
NO ACK
DATA OUT 1
DATA OUT N STOP
ACK SEQUENTIAL RANDOM READ START DEV SEL *
ACK
ACK DEV SEL * START
ACK
BYTE ADDR R/W
BYTE ADDR
DATA OUT 1 R/W
ACK
NO ACK
DATA OUT N STOP
AI01105C
Note: 1. The seven most significant bits of the Device Select Code of a Random Read (in the 1 st and 4th bytes) must be identical.
Read Operations Read operations are performed independently of the state of the Write Control (WC) signal. Random Address Read A dummy Write is performed to load the address into the address counter (as shown in Figure 9) but without sending a Stop condition. Then, the bus master sends another Start condition, and repeats the Device Select Code, with the RW bit set to 1. The device acknowledges this, and outputs the contents of the addressed byte. The bus master must not acknowledge the byte, and terminates the transfer with a Stop condition.
Current Address Read The device has an internal address counter which is incremented each time a byte is read. For the Current Address Read operation, following a Start condition, the bus master only sends a Device Select Code with the RW bit set to 1. The device acknowledges this, and outputs the byte addressed by the internal address counter. The counter is then incremented. The bus master terminates the transfer with a Stop condition, as shown in Figure 9, without acknowledging the byte. Sequential Read This operation can be used after a Current Address Read or a Random Address Read. The bus
9/25
M24256-B, M24128-B
master does acknowledge the data byte output, and sends additional clock pulses so that the device continues to output the next byte in sequence. To terminate the stream of bytes, the bus master must not acknowledge the last byte, and must generate a Stop condition, as shown in Figure 9. The output data comes from consecutive addresses, with the internal address counter automatically incremented after each byte output. After the last memory address, the address counter `rolls-over', and the device continues to output data from memory address 00h. Acknowledge in Read Mode For all Read commands, the device waits, after each byte read, for an acknowledgment during the 9th bit time. If the bus master does not drive Serial Data (SDA) Low during this time, the device terminates the data transfer and switches to its Standby mode.
10/25
M24256-B, M24128-B
MAXIMUM RATING Stressing the device above the rating listed in the Absolute Maximum Ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not imTable 6. Absolute Maximum Ratings
Symbol TSTG TLEAD Storage Temperature Lead Temperature during Soldering Input or Output range Supply Voltage PDIP: 10 seconds SO: 20 seconds (max) 1 TSSOP: 20 seconds (max) 1 -V voltage range all other voltage ranges -V voltage range all other voltage ranges -0.6 -0.6 -0.3 -0.3 -3000 Parameter Min. -65 Max. 150 260 235 235 4.2 6.5 4.2 6.5 3000 Unit C C
plied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
VIO VCC VESD
V V V
Electrostatic Discharge Voltage (Human Body model) 2
Note: 1. IPC/JEDEC J-STD-020A 2. JEDEC Std JESD22-A114A (C1=100 pF, R1=1500 , R2=500 )
11/25
M24256-B, M24128-B
DC AND AC PARAMETERS This section summarizes the operating and measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC Characteristic tables that follow are derived from tests performed under the MeasureTable 7. Operating Conditions (M24xxx-B)
Symbol VCC TA Supply Voltage Ambient Operating Temperature Parameter Min. 4.5 -40 Max. 5.5 85 Unit V C
ment Conditions summarized in the relevant tables. Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters.
Table 8. Operating Conditions (M24xxx-BV)
Symbol VCC TA Supply Voltage Ambient Operating Temperature Parameter Min. 2.5 -40 Max. 3.6 85 Unit V C
Table 9. Operating Conditions (M24xxx-BW)
Symbol VCC TA Supply Voltage Ambient Operating Temperature Parameter Min. 2.5 -40 Max. 5.5 85 Unit V C
Table 10. Operating Conditions (M24xxx-BR)
Symbol VCC TA Supply Voltage Ambient Operating Temperature Parameter Min. 1.8 -40 Max. 5.5 85 Unit V C
Table 11. Operating Conditions (M24xxx-BS)
Symbol VCC TA Supply Voltage Ambient Operating Temperature Parameter Min. 1.8 -40 Max. 3.6 85 Unit V C
Table 12. AC Measurement Conditions
Symbol CL Load Capacitance Input Rise and Fall Times Input Levels Input and Output Timing Reference Levels Parameter Min. 100 50 0.2VCC to 0.8VCC 0.3VCC to 0.7VCC Max. Unit pF ns V V
12/25
M24256-B, M24128-B
Figure 10. AC Measurement I/O Waveform
Input Levels 0.8VCC Input and Output Timing Reference Levels 0.7VCC 0.3VCC
AI00825B
0.2VCC
Table 13. Input Parameters
Symbol CIN CIN ZL ZH tNS Parameter1,2 Input Capacitance (SDA) Input Capacitance (other pins) Input Impedance (E2, E1, E0, WC) Input Impedance (E2, E1, E0, WC) Pulse width ignored (Input Filter on SCL and SDA) VIN < 0.5 V VIN > 0.7VCC Single glitch 30 500 100 Test Condition Min. Max. 8 6 Unit pF pF k k ns
Note: 1. TA = 25 C, f = 400 kHz 2. Sampled only, not 100% tested.
Table 14. M24xxx-BV Power-Up Timing and Vth Threshold
Symbol tPU Vth Parameter1 Time delay to Read or Write instruction Threshold Voltage 1.4 Test Condition Min. Max. 200 1.6 Unit s V
Note: 1. These parameters are characterized only.
Table 15. DC Characteristics (M24xxx-B)
Symbol ILI ILO ICC ICC1 Parameter Input Leakage Current (SCL, SDA) Output Leakage Current Supply Current Stand-by Supply Current Input Low Voltage (SCL, SDA) VIL Input Low Voltage (E2, E1, E0, WC) Input High Voltage (E2, E1, E0, SCL, SDA, WC) Output Low Voltage IOL = 3 mA, VCC = 5 V Test Condition (in addition to those in Table 7) VIN = VSS or VCC device in Stand-by mode VOUT = VSS or VCC, SDA in Hi-Z VCC=5V, fc=400kHz (rise/fall time < 30ns) VIN = VSS or VCC , VCC = 5 V -0.3 -0.3 0.7VCC Min. Max. 2 2 2 10 0.3VCC 0.5 VCC+1 0.4 Unit A A mA A V V V V
VIH VOL
13/25
M24256-B, M24128-B
Table 16. DC Characteristics (M24xxx-BV)
Symbol ILI ILO ICC ICC1 Parameter Input Leakage Current (SCL, SDA) Output Leakage Current Supply Current Stand-by Supply Current Input Low Voltage (SCL, SDA) VIL Input Low Voltage (E2, E1, E0, WC) Input High Voltage (E2, E1, E0, SCL, SDA, WC) Output Low Voltage IOL = 2.1 mA, VCC = 2.7 V Test Condition (in addition to those in Table 8) VIN = VSS or VCC device in Stand-by mode VOUT = VSS or VCC, SDA in Hi-Z VCC =2.7V, fc=400kHz (rise/fall time < 30ns) VIN = VSS or VCC , VCC = 2.7 V -0.3 -0.3 0.7VCC Min. Max. 2 2 2 2 0.3VCC 0.5 VCC+0.6 0.4 Unit A A mA A V V V V
VIH VOL
Table 17. DC Characteristics (M24xxx-BW)
Symbol ILI ILO ICC ICC1 Parameter Input Leakage Current (SCL, SDA) Output Leakage Current Supply Current Stand-by Supply Current Input Low Voltage (SCL, SDA) VIL Input Low Voltage (E2, E1, E0, WC) Input High Voltage (E2, E1, E0, SCL, SDA, WC) Output Low Voltage IOL = 2.1 mA, VCC = 2.5 V Test Condition (in addition to those in Table 9) VIN = VSS or VCC device in Stand-by mode VOUT = VSS or VCC, SDA in Hi-Z VCC =2.5V, fc=400kHz (rise/fall time < 30ns) VIN = VSS or VCC , VCC = 2.5 V -0.3 -0.3 0.7VCC Min. Max. 2 2 1 2 0.3VCC 0.5 VCC+1 0.4 Unit A A mA A V V V V
VIH VOL
14/25
M24256-B, M24128-B
Table 18. DC Characteristics (M24xxx-BR)
Symbol ILI ILO ICC ICC1 Parameter Input Leakage Current (SCL, SDA) Output Leakage Current Supply Current Stand-by Supply Current Input Low Voltage (SCL, SDA) VIL Input Low Voltage (E2, E1, E0, WC) Input High Voltage (E2, E1, E0, SCL, SDA, WC) Output Low Voltage IOL = 0.7 mA, VCC = 1.8 V Test Condition (in addition to those in Table 10) VIN = VSS or VCC device in Stand-by mode VOUT = VSS or VCC, SDA in Hi-Z VCC =1.8V, fc=100kHz (rise/fall time < 30ns) VIN = VSS or VCC , VCC = 1.8 V -0.3 -0.3 0.7VCC Min. Max. 2 2 0.8 1 11 0.3 VCC 0.5 VCC+1 0.2 1 Unit A A mA A V V V V
VIH VOL
Note: 1. This is Preliminary Data
Table 19. DC Characteristics (M24xxx-BS)
Symbol ILI ILO ICC ICC1 Parameter Input Leakage Current (SCL, SDA) Output Leakage Current Supply Current Stand-by Supply Current Input Low Voltage (SCL, SDA) VIL Input Low Voltage (E2, E1, E0, WC) Input High Voltage (E2, E1, E0, SCL, SDA, WC) Output Low Voltage IOL = 0.7 mA, VCC = 1.8 V Test Condition (in addition to those in Table 11) VIN = VSS or VCC device in Stand-by mode VOUT = VSS or VCC, SDA in Hi-Z VCC =1.8V, fc=400kHz (rise/fall time < 30ns) VIN = VSS or VCC , VCC = 1.8 V -0.3 -0.3 0.7VCC Min. Max. 2 2 0.5 1 11 0.3 VCC 0.5 VCC+0.6 0.2 1 Unit A A mA A V V V V
VIH VOL
Note: 1. This is Preliminary Data
15/25
M24256-B, M24128-B
Table 20. AC Characteristics (M24xxx-B, M24xxx-BW)
Test conditions specified in Table 12 and Table 7 or 9 Symbol fC tCHCL tCLCH tCH1CH2 tCL1CL2 tDH1DH2 2 tDL1DL2 2 tDXCX tCLDX tCLQX tCLQV 3 tCHDX 1 tDLCL tCHDH tDHDL tW
Note: 1. 2. 3. 4.
Alt. fSCL tHIGH tLOW tR tF tR tF tSU:DAT tHD:DAT tDH tAA tSU:STA tHD:STA tSU:STO tBUF tWR Clock Frequency
Parameter
Min.
Max. 400
Unit kHz ns ns
Clock Pulse Width High Clock Pulse Width Low Clock Rise Time Clock Fall Time SDA Rise Time SDA Fall Time Data In Set Up Time Data In Hold Time Data Out Hold Time Clock Low to Next Data Valid (Access Time) Start Condition Set Up Time Start Condition Hold Time Stop Condition Set Up Time Time between Stop Condition and Next Start Condition Write Time
600 1300 300 300 20 20 100 0 200 200 600 600 600 1300 10 or 4 5 900 300 300
ns ns ns ns ns ns ns ns ns ns ns ns ms
For a reSTART condition, or following a Write cycle. Sampled only, not 100% tested. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA. The Write Time of 5 ms only applies to M24128-B and M24128-BW devices bearing the process letter "B" in the package marking (on the top side of the package, on the right side), otherwise the Write Time is 10 ms. For further details, please contact your nearest ST sales office, and ask for a copy of the M24128 Product Change Notice.
16/25
M24256-B, M24128-B
Table 21. AC Characteristics (M24xxx-BV, M24xxx-BR, M24xxx-BS)
Test conditions specified in Table 12 and Table 8 or 10 or 11 Symbol fC tCHCL tCLCH tCH1CH2 tCL1CL2 tDH1DH2 2 tDL1DL2 2 tDXCX tCLDX tCLQX tCLQV 3 tCHDX 1 tDLCL tCHDH tDHDL tW Alt. fSCL tHIGH tLOW tR tF tR tF tSU:DAT tHD:DAT tDH tAA tSU:STA tHD:STA tSU:STO tBUF tWR Clock Frequency Clock Pulse Width High Clock Pulse Width Low Clock Rise Time Clock Fall Time SDA Rise Time SDA Fall Time Data In Set Up Time Data In Hold Time Data Out Hold Time Clock Low to Next Data Valid (Access Time) Start Condition Set Up Time Start Condition Hold Time Stop Condition Set Up Time Time between Stop Condition and Next Start Condition Write Time 20 20 100 0 200 200 600 600 600 1300 10 900 600 1300 300 300 300 300 Parameter Min. Max. 400 Unit kHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms
Note: 1. For a reSTART condition, or following a Write cycle. 2. Sampled only, not 100% tested. 3. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA.
17/25
M24256-B, M24128-B
Figure 11. AC Waveforms
tCHCL
tCLCH
SCL tDLCL SDA In tCHDX START Condition SDA Input tCLDX SDA tDXCX Change tCHDH tDHDL START STOP Condition Condition
SCL
SDA In tCHDH STOP Condition tW Write Cycle tCHDX START Condition
SCL tCLQV SDA Out Data Valid tCLQX
AI00795C
18/25
M24256-B, M24128-B
PACKAGE MECHANICAL PDIP8 - 8 pin Plastic DIP, 0.25mm lead frame, Package Outline
b2 A2 A1 b e A L
E
c eA eB
D
8
E1
1 PDIP-B
Notes: 1. Drawing is not to scale.
PDIP8 - 8 pin Plastic DIP, 0.25mm lead frame, Package Mechanical Data
mm Symb. Typ. A A1 A2 b b2 c D E E1 e eA eB L 3.30 2.92 3.30 0.46 1.52 0.25 9.27 7.87 6.35 2.54 7.62 0.38 2.92 0.36 1.14 0.20 9.02 7.62 6.10 - - 4.95 0.56 1.78 0.36 10.16 8.26 7.11 - - 10.92 3.81 0.130 0.115 0.130 0.018 0.060 0.010 0.365 0.310 0.250 0.100 0.300 Min. Max. 5.33 0.015 0.115 0.014 0.045 0.008 0.355 0.300 0.240 - - 0.195 0.022 0.070 0.014 0.400 0.325 0.280 - - 0.430 0.150 Typ. Min. Max. 0.210 inches
19/25
M24256-B, M24128-B
SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, Package Outline
h x 45 A C B e D CP
N
E
1
H A1 L
SO-a
Note: Drawing is not to scale.
SO8 narrow - 8 lead Plastic Small Outline, 150 mils body width, Package Mechanical Data
mm Symb. Typ. A A1 B C D E e H h L N CP 1.27 Min. 1.35 0.10 0.33 0.19 4.80 3.80 - 5.80 0.25 0.40 0 8 0.10 Max. 1.75 0.25 0.51 0.25 5.00 4.00 - 6.20 0.50 0.90 8 0.050 Typ. Min. 0.053 0.004 0.013 0.007 0.189 0.150 - 0.228 0.010 0.016 0 8 0.004 Max. 0.069 0.010 0.020 0.010 0.197 0.157 - 0.244 0.020 0.035 8 inches
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M24256-B, M24128-B
SO8 wide - 8 lead Plastic Small Outline, 200 mils body width, Package Outline
A2 B e D
A C CP
N
E
1
H A1 L
SO-b
Note: Drawing is not to scale.
SO8 wide - 8 lead Plastic Small Outline, 200 mils body width, Package Mechanical Data
mm Symb. Typ. A A1 A2 B C D E e H L N CP 1.27 0.20 0.35 - 5.15 5.20 - 7.70 0.50 0 8 0.10 0.10 Min. Max. 2.03 0.25 1.78 0.45 - 5.35 5.40 - 8.10 0.80 10 0.050 0.008 0.014 - 0.203 0.205 - 0.303 0.020 0 8 0.004 0.004 Typ. Min. Max. 0.080 0.010 0.070 0.018 - 0.211 0.213 - 0.319 0.031 10 inches
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M24256-B, M24128-B
TSSOP8 - 8 lead Thin Shrink Small Outline, Package Outline
D
8
5
c
E1 E
1
4
A1 A CP b e A2
L L1
TSSOP8AM
Notes: 1. Drawing is not to scale.
TSSOP8 - 8 lead Thin Shrink Small Outline, Package Mechanical Data
mm Symbol Typ. A A1 A2 b c CP D e E E1 L L1 3.000 0.650 6.400 4.400 0.600 1.000 0 8 2.900 - 6.200 4.300 0.450 1.000 0.050 0.800 0.190 0.090 Min. Max. 1.200 0.150 1.050 0.300 0.200 0.100 3.100 - 6.600 4.500 0.750 0.1181 0.0256 0.2520 0.1732 0.0236 0.0394 0 8 0.1142 - 0.2441 0.1693 0.0177 0.0394 0.0020 0.0315 0.0075 0.0035 Typ. Min. Max. 0.0472 0.0059 0.0413 0.0118 0.0079 0.0039 0.1220 - 0.2598 0.1772 0.0295 inches
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M24256-B, M24128-B
PART NUMBERING Table 22. Ordering Information Scheme
Example: Device Type M24 = I2C serial access EEPROM Device Function 256 = 256 Kbit (32K x 8) 128 = 128 Kbit (16K x 8) Operating Voltage blank4 = VCC = 4.5 to 5.5V V2 = VCC = 2.5 to 3.6V W4 = VCC = 2.5 to 5.5V R3 = VCC = 1.8 to 5.5V S = VCC = 1.8 to 3.6V Package BN = PDIP8 MN = SO8 (150 mil width) MW1 = SO8 (200 mil width) DW = TSSOP8 (169 mil width) Temperature Range 6 = -40 to 85 C Option T = Tape & Reel Packing
Note: 1. 2. 3. 4. Available only on request (by preference, please use MN, SO8 150 mil width, package instead. Available for the M24256-B only. Available for the M24128-B only. M24256-B and M24256-BW bearing the process letter "V" in the package marking, and M24128-B and M24128-BW bearing the process letter "B" in the package marking (on the top side of the package, on the right side), guarantee more than 1 million Erase/ Write cycle endurance. For more information about these devices, and their device identification, please contact your nearest ST sales office, and ask for the Product Change Notice.
M24256
-
B
W MN
6
T
For a list of available options (speed, package, etc.) or for further information on any aspect of this
device, please contact your nearest ST Sales Office.
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M24256-B, M24128-B
REVISION HISTORY Table 23. Document Revision History
Date 28-Dec-1999 24-Feb-2000 22-Nov-2000 Rev. 2.1 2.2 2.3 TSSOP8 package added E2, E1, E0 must be tied to Vcc or Vss Low Pass Filter Time Constant changed to Glitch Filter -V voltage range added -V voltage range changed to 2.5V to 3.6V Lead Soldering Temperature in the Absolute Maximum Ratings table amended Write Cycle Polling Flow Chart using ACK illustration updated. SO8(wide) package added References to PSDIP8 changed to PDIP8, and Package Mechanical data updated -R voltage range added. Package mechanical data updated for TSSOP8 and TSSOP14 packages according to JEDEC\MO-153 Document promoted from "Preliminary Data" to "Full Data Sheet" TSSOP14 package removed Absolute Max Ratings and DC characteristics updated for M24256-BV Specification of Test Condition for Leakage Currents in the DC Characteristics table improved 1 million Erase/Write cycle endurance for M24256-B and M24256-BW products with process letter "V" Document reformatted. Parameters changed are: 1 million Erase/Write cycle endurance and 5 ms write time for M24128-B and M24128-BW products with process letter "B". Superfluous (and incorrectly present) 100kHz AC Characteristics table for M24256-BR removed. Description of Revision
30-Jan-2001
2.4
01-Jun-2001
2.5
16-Oct-2001 09-Nov-2001 21-Mar-2002 18-Oct-2002 20-Nov-2002
2.6 2.7 2.8 3.0 3.1
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M24256-B, M24128-B
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is registered trademark of STMicroelectronics All other names are the property of their respective owners (c) 2002 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. www.st.com
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