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(R)
X4643, X4645
64K, 8K x 8 Bit
Data Sheet March 29, 2005 FN8123.0
CPU Supervisor with 64K EEPROM
FEATURES * Selectable watchdog timer * Low VCC detection and reset assertion --Four standard reset threshold voltages --Adjust low VCC reset threshold voltage using special programming sequence --Reset signal valid to VCC = 1V * Low power CMOS --<20A max standby current, watchdog on --<1A standby current, watchdog off --3mA active current * 64Kbits of EEPROM --64-byte page write mode --Self-timed write cycle --5ms write cycle time (typical) * Built-in inadvertent write protection --Power-up/power-down protection circuitry * 400kHz 2-wire interface * 2.7V to 5.5V power supply operation * Available packages --8-lead SOIC --8-lead TSSOP
DESCRIPTION The X4643/5 combines four popular functions, Poweron Reset Control, Watchdog Timer, Supply Voltage Supervision, and Serial EEPROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. Applying power to the device activates the power-on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and oscillator to stabilize before the processor can execute code. The Watchdog Timer provides an independent protection mechanism for microcontrollers. When the microcontroller fails to restart a timer within a selectable time out interval, the device activates the RESET/RESET signal. The user selects the interval from three preset values. Once selected, the interval does not change, even after cycling the power. The device's low VCC detection circuitry protects the user's system from low voltage conditions, resetting the system when VCC falls below the set minimum VCC trip point. RESET/RESET is asserted until VCC returns to proper operating level and stabilizes. Four industry standard VTRIP thresholds are available, however, Intersil's unique circuits allow the threshold to be reprogrammed to meet custom requirements or to fine-tune the threshold for applications requiring higher precision.
BLOCK DIAGRAM
Watchdog Transition Detector WP Data Register Command Decode & Control Logic VCC Threshold Reset Logic Block Lock Control Protect Logic Status Register EEPROM Array RESET (X4643/5) RESET (X4645)
Watchdog Timer Reset
SDA
SCL S0 S1
Reset & Watchdog Timebase 8Kbit
VCC VTRIP
+ -
Power-on and Low Voltage Reset Generation
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X4643, X4645
PIN CONFIGURATION
8-Pin JEDEC SOIC S0 S1 RESET/RESET VSS 1 2 3 4 8 7 6 5 VCC WP SCL SDA
8 Pin TSSOP WP VCC S0 S1 1 2 3 4 8 7 6 5 SCL SDA VSS RESET/RESET
PIN FUNCTION Pin (SOIC)
1 2 3
Pin (TSSOP)
3 4 5
Name
S0 S1 Device Select Input Device Select Input
Function
RESET/RESET
Reset Output. RESET/RESET is an active LOW/HIGH, open drain output which goes active whenever VCC falls below the minimum VCC sense level. It will remain active until VCC rises above the minimum VCC sense level for 250ms. RESET/RESET goes active if the Watchdog Timer is enabled and SDA remains either HIGH or LOW longer than the selectable Watchdog time out period. A falling edge on SDA, while SCL is HIGH, resets the Watchdog Timer. RESET/RESET goes active on power-up and remains active for 250ms after the power supply stabilizes. Ground Serial Data. SDA is a bidirectional pin used to transfer data into and out of the device. It has an open drain output and may be wire ORed with other open drain or open collector outputs. This pin requires a pull up resistor and the input buffer is always active (not gated). Watchdog Input. A HIGH to LOW transition on the SDA (while SCL is HIGH) restarts the Watchdog timer. The absence of a HIGH to LOW transition within the watchdog time out period results in RESET/RESET going active. Serial Clock. The Serial Clock controls the serial bus timing for data input and output. Write Protect. WP HIGH used in conjunction with WPEN bit prevents writes to the control register. Supply Voltage
4 5
6 7
VSS SDA
6 7 8
8 1 2
SCL WP VCC
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PRINCIPLES OF OPERATION Power-On Reset Application of power to the X4643/5 activates a Power-on Reset Circuit that pulls the RESET/RESET pin active. This signal provides several benefits. - It prevents the system microprocessor from starting to operate with insufficient voltage. - It prevents the processor from operating prior to stabilization of the oscillator. - It allows time for an FPGA to download its configuration prior to initialization of the circuit. - It prevents communication to the EEPROM, greatly reducing the likelihood of data corruption on power-up. When VCC exceeds the device VTRIP threshold value for 200ms (nominal) the circuit releases RESET/RESET allowing the system to begin operation. LOW VOLTAGE MONITORING During operation, the X4643/5 monitors the VCC level and asserts RESET/RESET if supply voltage falls below a preset minimum VTRIP. The RESET/RESET signal prevents the microprocessor from operating in a power fail or brownout condition. The RESET/RESET signal remains active until the voltage drops below 1V. It also remains active until VCC returns and exceeds VTRIP for 200ms. WATCHDOG TIMER The Watchdog Timer circuit monitors the microprocessor activity by monitoring the SDA and SCL pins. The microprocessor must toggle the SDA pin HIGH to LOW periodically, while SCL is HIGH (this is a start bit) prior to the expiration of the watchdog time out period to prevent a RESET/RESET signal. The state of two nonvolatile control bits in the Status Register determine the watchdog timer period. The microprocessor can change these watchdog bits, or they may be "locked" by tying the WP pin HIGH. EEPROM INADVERTENT WRITE PROTECTION When RESET/RESET goes active as a result of a low voltage condition or Watchdog Timer Time Out, any inprogress communications are terminated. While RESET/RESET is active, no new communications are allowed and no nonvolatile write operation can start. Nonvolatile writes in-progress when RESET/RESET goes active are allowed to finish. Additional protection mechanisms are provided with memory Block Lock and the Write Protect (WP) pin. These are discussed elsewhere in this document. VCC THRESHOLD RESET PROCEDURE The X4643/5 is shipped with a standard VCC threshold (VTRIP) voltage. This value will not change over normal operating and storage conditions. However, in applications where the standard VTRIP is not exactly right, or if higher precision is needed in the VTRIP value, the X4643/5 threshold may be adjusted. The procedure is described below, and uses the application of a nonvolatile control signal.
Figure 1. Set VTRIP Level Sequence (VCC = desired VTRIP values WEL bit set)
WP
VP = 12-15V
01234567 SCL
01234567
01234567
01234567
SDA A0h 00h 01h 00h
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Setting the VTRIP Voltage This procedure is used to set the VTRIP to a higher or lower voltage value. It is necessary to reset the trip point before setting the new value. To set the new VTRIP voltage, start by setting the WEL bit in the control register, then apply the desired VTRIP threshold voltage to the VCC pin and the programming voltage, VP, to the WP pin and 2 byte address and 1 byte of "00" data. The stop bit following a valid write operation initiates the VTRIP programming sequence. Bring WP LOW to complete the operation. Resetting the VTRIP Voltage This procedure is used to set the VTRIP to a "native" voltage level. For example, if the current VTRIP is 4.4V and the new VTRIP must be 4.0V, then the VTRIP must be reset. When VTRIP is reset, the new VTRIP is something less than 1.7V. This procedure must be used to set the voltage to a lower value. To reset the new VTRIP voltage start by setting the WEL bit in the control register, apply VCC and the programming voltage, VP , to the WP pin and 2 byte address and 1 byte of "00" data. The stop bit of a valid write operation initiates the VTRIP programming sequence. Bring WP LOW to complete the operation.
Figure 2. Reset VTRIP Level Sequence (VCC > 3V. WP = 12-15V, WEL bit set)
WP
VP = 12-15V
01234567 SCL
01234567
01234567
01234567
SDA A0h 00h 03h 00h
Figure 3. Sample VTRIP Reset Circuit
VP SOIC 4.7K RESET VTRIP Adj. 1 2 3 4 X4643 8 7 6 5 Run SCL SDA Adjust C
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Figure 4. VTRIP Programming Sequence
VTRIP Programming
Execute Reset VTRIP Sequence
Set VCC = VCC Applied = Desired VTRIP
New VCC Applied = Old VCC Applied + Error
Execute Set VTRIP Sequence
New VCC Applied = Old VCC Applied - Error
Apply 5V to VCC
Execute Reset VTRIP Sequence
Decrement VCC (VCC = VCC - 50mV)
NO
RESET pin goes active?
YES Error -Emax Error Emax
Measured VTRIP Desired VTRIP
-Emax < Error < Emax DONE
Emax = Maximum Allowed VTRIP Error
Control Register The Control Register provides the user a mechanism for changing the Block Lock and Watchdog Timer settings. The Block Lock and Watchdog Timer bits are nonvolatile and do not change when power is removed. The Control Register is accessed at address FFFFh. It can only be modified by performing a byte write operation directly to the address of the register and only one data byte is allowed for each register write operation.
Prior to writing to the Control Register, the WEL and RWEL bits must be set using a two step process, with the whole sequence requiring 3 steps. See "Writing to the Control Register" below. The user must issue a stop after sending this byte to the register to initiate the nonvolatile cycle that stores WD1, and WD0. The X4643/5 will not acknowledge any data bytes written after the first byte is entered.
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The state of the Control Register can be read at any time by performing a random read at address FFFFh. Only one byte is read by each register read operation. The X4643/5 resets itself after the first byte is read. The master should supply a stop condition to be consistent with the bus protocol, but a stop is not required to end this operation. 7
WPEN
6
5
4
3
2
1
0
acknowledge will be issued after the Data Byte). The WEL bit is set by writing a "1" to the WEL bit and zeroes to the other bits of the control register. Once set, WEL remains set until either it is reset to 0 (by writing a "0" to the WEL bit and zeroes to the other bits of the control register) or until the part powers up again. Writes to the WEL bit do not cause a nonvolatile write cycle, so the device is ready for the next operation immediately after the stop condition. WD1, WD0: Watchdog Timer Bits
WD1 WD0 BP1 BP0 RWEL WEL BP2
BP2, BP1, BP0: Block Protect Bits (Nonvolatile) The Block Protect Bits, BP2, BP1 and BP0, determine which blocks of the array are write protected. A write to a protected block of memory is ignored. The block protect bits will prevent write operations to the following segments of the array. BP2 BP1 BP0 Protected Addresses (Size)
None (factory setting) None None 0000h - 1FFFh (8K bytes) 000h - 03Fh (64 bytes) 000h - 07Fh (128 bytes) 000h - 0FFh (256 bytes) 000h - 1FFh (512 bytes)
The bits WD1 and WD0 control the period of the Watchdog Timer. The options are shown below. WD1
0 0 1 1
WD0
0 1 0 1
Watchdog Time Out Period
1.4 seconds 600 milliseconds 200 milliseconds disabled (factory setting)
Array Lock
None None None Full Array (All) First Page (P1) First 2 pgs (P2) First 4 pgs (P4) First 8 pgs (P8)
0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1
Write Protect Enable These devices have an advanced block lock scheme that protects one of five blocks of the array when enabled. It provides hardware write protection through the use of a WP pin and a nonvolatile Write Protect Enable (WPEN) bit. The Write Protect (WP) pin and the Write Protect Enable (WPEN) bit in the Control Register control the programmable Hardware Write Protect feature. Hardware Write Protection is enabled when the WP pin and the WPEN bit are HIGH and disabled when either the WP pin or the WPEN bit is LOW. When the chip is Hardware Write Protected, nonvolatile writes to the block protected sections in the memory array cannot be written and the block protect bits cannot be changed. Only the sections of the memory array that are not block protected can be written. Note that since the WPEN bit is write protected, it cannot be changed back to a LOW state; so write protection is enabled as long as the WP pin is held HIGH.
RWEL: Register Write Enable Latch (Volatile) The RWEL bit must be set to "1" prior to a write to the Control Register. WEL: Write Enable Latch (Volatile) The WEL bit controls the access to the memory and to the Register during a write operation. This bit is a volatile latch that powers up in the LOW (disabled) state. While the WEL bit is LOW, writes to any address, including any control registers will be ignored (no Table 1. Write Protect Enable Bit and WP Pin Function WP
LOW HIGH HIGH
WPEN
X 0 1
Memory Array not Block Protected
Writes OK Writes OK Writes OK
Memory Array Block Protected
Writes Blocked Writes Blocked Writes Blocked
Block Protect Bits
Writes OK Writes OK Writes Blocked
WPEN Bit
Writes OK Writes OK Writes Blocked
Protection
Software Software Hardware
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Writing to the Control Register Changing any of the nonvolatile bits of the control register requires the following steps: - Write a 02H to the Control Register to set the Write Enable Latch (WEL). This is a volatile operation, so there is no delay after the write. (Operation preceeded by a start and ended with a stop). - Write a 06H to the Control Register to set both the Register Write Enable Latch (RWEL) and the WEL bit. This is also a volatile cycle. The zeros in the data byte are required. (Operation preceeded by a start and ended with a stop). - Write a value to the Control Register that has all the control bits set to the desired state. This can be represented as 0xys t01r in binary, where xy are the WD bits, and rst are the BP bits. (Operation preceeded by a start and ended with a stop). Since this is a nonvolatile write cycle it will take up to 10ms to complete. The RWEL bit is reset by this cycle and the sequence must be repeated to change the nonvolatile bits again. If bit 2 is set to `1' in this third step (0xys t11r) then the RWEL bit is set, but the WD1, WD0, BP2, BP1 and BP0 bits remain unchanged. Writing a second byte to the control register is not allowed. Doing so aborts the write operation and returns a NACK. - A read operation occurring between any of the previous operations will not interrupt the register write operation. Figure 5. Valid Data Changes on the SDA Bus
SCL
- The RWEL bit cannot be reset without writing to the nonvolatile control bits in the control register, power cycling the device or attempting a write to a write protected block. To illustrate, a sequence of writes to the device consisting of [02H, 06H, 02H] will reset all of the nonvolatile bits in the Control Register to 0. A sequence of [02H, 06H, 06H] will leave the nonvolatile bits unchanged and the RWEL bit remains set. SERIAL INTERFACE Serial Interface Conventions The device supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. Therefore, the devices in this family operate as slaves in all applications. Serial Clock and Data Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. See Figure 5.
SDA
Data Stable
Data Change
Data Stable
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Serial Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. See Figure 6. Figure 6. Valid Start and Stop Conditions Serial Stop Condition All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used to place the device into the Standby power mode after a read sequence. A stop condition can only be issued after the transmitting device has released the bus. See Figure 6.
SCL
SDA Start Stop
Serial Acknowledge Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle, the receiver will pull the SDA line LOW to acknowledge that it received the eight bits of data. Refer to Figure 7. The device will respond with an acknowledge after recognition of a start condition and if the correct Device Identifier and Select bits are contained in the Slave Address Byte. If a write operation is selected, the device will respond with an acknowledge after the receipt of each subsequent eight bit word. The device Figure 7. Acknowledge Response From Receiver
SCL from Master Data Output from 1
will acknowledge all incoming data and address bytes, except for the Slave Address Byte when the Device Identifier and/or Select bits are incorrect. In the read mode, the device will transmit eight bits of data, release the SDA line, then monitor the line for an acknowledge. If an acknowledge is detected and no stop condition is generated by the master, the device will continue to transmit data. The device will terminate further data transmissions if an acknowledge is not detected. The master must then issue a stop condition to return the device to Standby mode and place the device into a known state.
8
9
Data Output from Receiver
Start
Acknowledge
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Serial Write Operations BYTE WRITE For a write operation, the device requires the Slave Address Byte and a Word Address Byte. This gives the master access to any one of the words in the array. After receipt of the Word Address Byte, the device responds with an acknowledge, and awaits the next Figure 8. Byte Write Sequence
Signals from the Master
eight bits of data. After receiving the 8 bits of the Data Byte, the device again responds with an acknowledge. The master then terminates the transfer by generating a stop condition, at which time the device begins the internal write cycle to the nonvolatile memory. During this internal write cycle, the device inputs are disabled, so the device will not respond to any requests from the master. The SDA output is at high impedance. See Figure 8.
S t a r
Slave
Word Address Byte 1
0
Word Address Byte 0
Data
S t o
SDA Bus Signals from the Slave
10 1 0
A C K
A C K
A C K
A C K
A write to a protected block of memory will suppress the acknowledge bit. Page Write The device is capable of a page write operation. It is initiated in the same manner as the byte write operation; but instead of terminating the write cycle after the first data byte is transferred, the master can transmit an unlimited number of 8-bit bytes. After the receipt of each byte, the device will respond with an acknowledge, and the address is internally incremented by one. The page address remains constant. When the Figure 9. Page Write Operation
S t a r
counter reaches the end of the page, it "rolls over" and goes back to `0' on the same page. This means that the master can write 64-bytes to the page starting at any location on that page. If the master begins writing at location 60, and loads 12-bytes, then the first 4bytes are written to locations 60 through 63, and the last 8-bytes are written to locations 0 through 7. Afterwards, the address counter would point to location 8 of the page that was just written. If the master supplies more than 64-bytes of data, then new data over-writes the previous data, one byte at a time.
(1 < n < 64) Slave Word AdWord AdData Data S t o
Signals from the Master
SDA Bus 1010 Signals from the Slave 0
A C
A C
A C
A C
A C
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Figure 10. Writing 12 bytes to a 64-byte page starting at location 60.
8 Bytes Address Pointer Ends Here Addr = 8
4 Bytes
Address =7
Address 60
Address n-1
The master terminates the Data Byte loading by issuing a stop condition, which causes the device to begin the nonvolatile write cycle. As with the byte write operation, all inputs are disabled until completion of the internal write cycle. See Figure 9 for the address, acknowledge, and data transfer sequence. Stops and Write Modes Stop conditions that terminate write operations must be sent by the master after sending at least 1 full data byte plus the subsequent ACK signal. If a stop is issued in the middle of a data byte, or before 1 full data byte plus its associated ACK is sent, then the device will reset itself without performing the write. The contents of the array will not be effected. Acknowledge Polling The disabling of the inputs during nonvolatile cycles can be used to take advantage of the typical 5ms write cycle time. Once the stop condition is issued to indicate the end of the master's byte load operation, the device initiates the internal nonvolatile cycle. Acknowledge polling can be initiated immediately. To do this, the master issues a start condition followed by the Slave Address Byte for a write or read operation. If the device is still busy with the nonvolatile cycle then no ACK will be returned. If the device has completed the write operation, an ACK will be returned and the host can then proceed with the read or write operation. Refer to the flow chart in Figure 11.
Figure 11. Acknowledge Polling Sequence
Byte load completed by issuing STOP. Enter ACK Polling
Issue START
Issue Slave Address Byte (Read or Write)
Issue STOP
ACK returned? YES
NO
Nonvolatile Cycle complete. Continue command sequence?
NO Issue STOP
YES Continue Normal Read or Write Command Sequence
PROCEED
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Serial Read Operations Read operations are initiated in the same manner as write operations with the exception that the R/W bit of the Slave Address Byte is set to one. There are three basic read operations: Current Address Reads, Random Reads, and Sequential Reads. Current Address Read Internally the device contains an address counter that maintains the address of the last word read incremented by one. Therefore, if the last read was to address n, the next read operation would access data from address n+1. On power-up, the address of the address counter is undefined, requiring a read or write operation for initialization. Figure 12. Current Address Read Sequence
S t a r t
Upon receipt of the Slave Address Byte with the R/W bit set to one, the device issues an acknowledge and then transmits the eight bits of the Data Byte. The master terminates the read operation when it does not respond with an acknowledge during the ninth clock and then issues a stop condition. Refer to Figure 12 for the address, acknowledge, and data transfer sequence. It should be noted that the ninth clock cycle of the read operation is not a "don't care." To terminate a read operation, the master must either issue a stop condition during the ninth cycle or hold SDA HIGH during the ninth clock cycle and then issue a stop condition.
Signals from the Master
Slave Address
S t o p 1 A C K
SDA Bus Signals from the Slave
1 010
Data
Random Read Random read operation allows the master to access any memory location in the array. Prior to issuing the Slave Address Byte with the R/W bit set to one, the master must first perform a "dummy" write operation. The master issues the start condition and the Slave Address Byte, receives an acknowledge, then issues the Word Address Bytes. After acknowledging receipts Figure 13. Random Address Read Sequence
S t a r t
of the Word Address Bytes, the master immediately issues another start condition and the Slave Address Byte with the R/W bit set to one. This is followed by an acknowledge from the device and then by the eight bit word. The master terminates the read operation by not responding with an acknowledge and then issuing a stop condition. Refer to Figure 13 for the address, acknowledge, and data transfer sequence.
Signals from the Master
Slave Address
Word Address Byte 1
Word Address Byte 0
S t a r t
Slave Address
S t o p 1
SDA Bus Signals from the Slave
1010
0 A C K A C K A C K
A C K
Data
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There is a similar operation, called "Set Current Address" where the device does no operation, but enters a new address into the address counter if a stop is issued instead of the second start shown in Figure 13. The device goes into standby mode after the stop and all bus activity will be ignored until a start is detected. The next Current Address Read operation reads from the newly loaded address. This operation could be useful if the master knows the next address it needs to read, but is not ready for the data. Sequential Read Sequential reads can be initiated as either a current address read or random address read. The first Data Byte is transmitted as with the other modes; however, Figure 14. Sequential Read Sequence
Signals from the Master S t o p
the master now responds with an acknowledge, indicating it requires additional data. The device continues to output data for each acknowledge received. The master terminates the read operation by not responding with an acknowledge and then issuing a stop condition. The data output is sequential, with the data from address n followed by the data from address n + 1. The address counter for read operations increments through all page and column addresses, allowing the entire memory contents to be serially read during one operation. At the end of the address space the counter "rolls over" to address 0000H and the device continues to output data for each acknowledge received. Refer to Figure 14 for the acknowledge and data transfer sequence.
Slave Address
A C K
A C K
A C K
SDA Bus
1 A C K
Signals from the Slave
Data (1)
Data (2)
Data (n-1)
Data (n)
(n is any integer greater than 1)
X4643/5 Addressing SLAVE ADDRESS BYTE Following a start condition, the master must output a Slave Address Byte. This byte consists of several parts: - a device type identifier that is `1010' to access the array - one bits of `0'. - next two bits are the device address. - one bit of the slave command byte is a R/W bit. The R/W bit of the Slave Address Byte defines the operation to be performed. When the R/W bit is a one, then a read operation is selected. A zero selects a write operation. Refer to Figure 15.
- After loading the entire Slave Address Byte from the SDA bus, the device compares the input slave byte data to the proper slave byte. Upon a correct compare, the device outputs an acknowledge on the SDA line. Word Address The word address is either supplied by the master or obtained from an internal counter. The internal counter is undefined on a power-up condition.
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Figure 15. X4643/5 Addressing
Device Identifier
Device Select
1
0
1
0
0
S1
S0
R/W
Slave Address Byte High Order Word Address
0
0
0
A12 (X6)
A11 (X5)
A10 (X4)
A9 (X3)
A8 (X2)
Word Address Byte 0-64K Low Order Word Address
A7 (X1)
A6 (X0)
A5 (Y5)
A4 (Y4)
A3 (Y3)
A2 (Y2)
A1 (Y1)
A0 (Y0)
Word Address Byte 0 for all options
D7
D6
D5
D4
D3
D2
D1
D0
Data Byte for all options
Operational Notes The device powers-up in the following state: - The device is in the low power standby state. - The WEL bit is set to `0'. In this state it is not possible to write to the device. - SDA pin is the input mode. - RESET/RESET Signal is active for tPURST. Data Protection The following circuitry has been included to prevent inadvertent writes: - The WEL bit must be set to allow write operations. - The proper clock count and bit sequence is required prior to the stop bit in order to start a nonvolatile write cycle. - A three step sequence is required before writing into the Control Register to change Watchdog Timer or block lock settings. - The WP pin, when held HIGH, and WPEN bit at logic HIGH will prevent all writes to the Control Register.
- Communication to the device is inhibited while RESET/RESET is active and any in-progress communication is terminated. - Block Lock bits can protect sections of the memory array from write operations. SYMBOL TABLE
WAVEFORM INPUTS Must be steady May change from LOW to HIGH May change from HIGH to LOW Don't Care: Changes Allowed N/A OUTPUTS Will be steady Will change from LOW to HIGH Will change from HIGH to LOW Changing: State Not Known Center Line is High Impedance
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ABSOLUTE MAXIMUM RATINGS Temperature under bias .................... -65C to +135C Storage temperature ......................... -65C to +150C Voltage on any pin with respect to VSS... -1.0V to +7V D.C. output current ............................................... 5mA Lead temperature (soldering, 10 seconds) ........ 300C COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS Temperature
Commercial Industrial
Min.
0C -40C
Max.
70C +85C
Option
-2.7 and -2.7A Blank and -4.5A
Supply Voltage Limits
2.7V to 5.5V 4.5V to 5.5V
D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) VCC = 2.7 to 5.5V Symbol
ICC1(1) ICC2(1) ISB1(2) ISB2(2) ILI ILO VIL(3) VIH
(3)
Parameter
Active Supply Current Read Active Supply Current Write Standby Current DC (WDT off) Standby Current DC (WDT on) Input Leakage Current Output Leakage Current Input LOW Voltage Input nonvolatile Schmitt Trigger Input Hysteresis Fixed input level VCC related level Output LOW Voltage
Min
Max
1.0 3.0 1 20 10 10
Unit
mA mA A A A A V V V V
Test Conditions
VIL = VCC x 0.1, VIH = VCC x 0.9 fSCL = 400kHz, SDA = Commands VSDA = VSCL = VSB Others = GND or VSB VSDA = VSCL = VSB Others = GND or VSB VIN = GND to VCC VSDA = GND to VCC Device is in Standby(1)
-0.5 VCC x 0.7 0.2 .05 x VCC
VCC x 0.3 VCC + 0.5
VHYS
VOL
0.4
V
IOL = 3.0mA (2.7-5.5V)
Notes: (1) The device enters the Active state after any start, and remains active until: 9 clock cycles later if the Device Select Bits in the Slave Address Byte are incorrect; 200ns after a stop ending a read operation; or tWC after a stop ending a write operation. (2) The device goes into Standby: 200ns after any stop, except those that initiate a nonvolatile write cycle; tWC after a stop that initiates a nonvolatile cycle; or 9 clock cycles after any start that is not followed by the correct Device Select Bits in the Slave Address Byte. (3) VIL Min. and VIH Max. are for reference only and are not tested.
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FN8123.0 March 29, 2005
X4643, X4645
CAPACITANCE (TA = 25C, f = 1.0 MHz, VCC = 5V) Symbol
COUT CIN
(4) (4)
Parameter
Output Capacitance (SDA, RST/RST) Input Capacitance (SCL, WP)
Max.
8 6
Unit
pF pF
Test Conditions
VOUT = 0V VIN = 0V
Notes: (4) This parameter is periodically sampled and not 100% tested.
EQUIVALENT A.C. LOAD CIRCUIT
5V For VOL= 0.4V and IOL = 3 mA
A.C. TEST CONDITIONS
Input pulse levels Input rise and fall times Input and output timing levels Output load 0.1VCC to 0.9VCC 10ns 0.5VCC Standard output load
1533 SDA or RESET 100pF
A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified) Symbol
fSCL tIN tAA tBUF tLOW tHIGH tSU:STA tHD:STA tSU:DAT tHD:DAT tSU:STO tDH tR tF tSU:WP tHD:WP Cb SCL Clock Frequency Pulse width Suppression Time at inputs SCL LOW to SDA Data Out Valid Time the bus free before start of new transmission Clock LOW Time Clock HIGH Time Start Condition Setup Time Start Condition Hold Time Data In Setup Time Data In Hold Time Stop Condition Setup Time Data Output Hold Time SDA and SCL Rise Time SDA and SCL Fall Time WP Setup Time WP Hold Time Capacitive load for each bus line
Parameter
Min.
0 50 0.1 1.3 1.3 0.6 0.6 0.6 100 0 0.6 50 20 + .1Cb 20 + .1Cb 0.6 0
Max.
400 0.9
Unit
kHz ns s s s s s s ns s s ns
300 300
ns ns s s
400
pF
Notes: (1) Typical values are for TA = 25C and VCC = 5.0V (2) Cb = total capacitance of one bus line in pF.
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FN8123.0 March 29, 2005
X4643, X4645
TIMING DIAGRAMS Bus Timing
tF tHIGH tSU:DAT tSU:STA SDA IN tHD:STA tHD:DAT tSU:STO tLOW tR
SCL
tAA SDA OUT
tDH
tBUF
WP Pin Timing
START SCL Clk 1 Slave Address Byte SDA IN WP tSU:WP tHD:WP Clk 9
Write Cycle Timing
SCL
SDA
8th bit of Last Byte
ACK tWC Stop Condition Start Condition
Nonvolatile Write Cycle Timing Symbol
tWC
(1)
Parameter
Write Cycle Time
Min.
Typ.(1)
5
Max.
10
Unit
ms
Notes: (1) tWC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
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FN8123.0 March 29, 2005
X4643, X4645
Power-Up and Power-Down Timing
VTRIP VCC 0 Volts tR tPURST tRPD tPURST tF
RESET (X4645)
VRVALID
RESET (X4643)
VRVALID
RESET Output Timing Symbol
VTRIP
Parameter
Reset Trip Point Voltage, X4643/5-4.5A Reset Trip Point Voltage, X4643/5 Reset Trip Point Voltage, X4643/5-2.7A Reset Trip Point Voltage, X4643/5-2.7 Power-up Reset Time Out VCC Detect to Reset/Output VCC Fall Time VCC Rise Time Reset Valid VCC
Min.
4.5 4.25 2.85 2.55 100 100 100 1
Typ.
4.62 4.38 2.92 2.62 250
Max.
4.75 4.5 3.0 2.7 400 500
Unit
V
tPURST tRPD(8) tF(8) tR(8) VRVALID
ms ns s s V
Notes: (8) This parameter is periodically sampled and not 100% tested.
SDA vs. RESET Timing
tRSP tRSPtWDO tRST tRSP>tWDO tRST
SCL
SDA
RESET Note: All inputs are ignored during the active reset period (tRST).
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FN8123.0 March 29, 2005
X4643, X4645
RESET Output Timing Symbol
tWDO
Parameter
Watchdog Time Out Period, WD1 = 1, WD0 = 1 (factory setting) WD1 = 1, WD0 = 0 WD1 = 0, WD0 = 1 WD1 = 0, WD0 = 0 Reset Time Out
Min.
Typ.
OFF 250 650 1.5 250
Max.
Unit
100 450 1 100
300 850 2 400
ms ms sec ms
tRST
VTRIP Programming Timing Diagram (WEL = 1)
VCC (VTRIP) VP WP tVPS SCL tRP SDA A0h 00h 01h or 03h 00h tVPH tVPO VTRIP tTSU tTHD
VTRIP Programming Parameters Parameter
tVPS tVPH tTSU tTHD tWC tVPO tRP VP VTRAN Vta1 Vta2 Vtr Vtv
Description
VTRIP Program Enable Voltage Setup time VTRIP Program Enable Voltage Hold time VTRIP Setup time VTRIP Hold (stable) time VTRIP Write Cycle Time VTRIP Program Enable Voltage Off time (Between successive adjustments) VTRIP Program Recovery Period (Between successive adjustments) Programming Voltage VTRIP Programmed Voltage Range Initial VTRIP Program Voltage accuracy (VCC applied-VTRIP) (Programmed at 25C.) Subsequent VTRIP Program Voltage accuracy [(VCC applied-Vta1)-VTRIP. Programmed at 25C.] VTRIP Program Voltage repeatability (Successive program operations. Programmed at 25C.) VTRIP Program variation after programming (0-75C). (Programmed at 25C.)
Min.
1 1 1 10
Max.
Unit
s s s ms
10 0 10 15 2.55 -0.1 -25 -25 -25 18 4.75 +0.4 +25 +25 +25
ms s ms V V V mV mV mV
VTRIP programming parameters are periodically sampled and are not 100% tested.
18
FN8123.0 March 29, 2005
X4643, X4645
PACKAGING INFORMATION 8-Lead Plastic Small Outline Gull Wing Package Type S
0.150 (3.80) 0.228 (5.80) 0.158 (4.00) 0.244 (6.20) Pin 1 Index Pin 1
0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7
0.053 (1.35) 0.069 (1.75) 0.004 (0.19) 0.010 (0.25)
0.050 (1.27)
0.010 (0.25) X 45 0.020 (0.50)
0.050"Typical
0 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250"
0.050" Typical
FOOTPRINT
0.030" Typical 8 Places
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
19
FN8123.0 March 29, 2005
X4643, X4645
PACKAGING INFORMATION 8-Lead Plastic, TSSOP, Package Type V
.025 (.65) BSC
.169 (4.3) .252 (6.4) BSC .177 (4.5)
.114 (2.9) .122 (3.1) .047 (1.20) .0075 (.19) .0118 (.30) .002 (.05) .006 (.15)
.010 (.25) Gage Plane 0 - 8 .019 (.50) .029 (.75) Detail A (20X) (1.78) .031 (.80) .041 (1.05) See Detail "A" (0.42) (0.65) All Measurements Are Typical Seating Plane (4.16) (7.72)
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
20
FN8123.0 March 29, 2005
X4643, X4645
Ordering Information VCC Range
4.5-5.5V
VTRIP Range
4.5-4.75
Package
8L SOIC 8L TSSOP
Operating Temperature Range
0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C 0C-70C -40C-85C
Part Number RESET (Active LOW)
X4643S8-4.5A X4643S8I-4.5A X4643V8-4.5A X4643V8I-4.5A X4643S8 X4643S8I X4643V8 X4643V8I X4643S8-2.7A X4643S8I-2.7A X4643V8-2.7A X4643V8I-2.7A X4643S8-2.7 X4643S8I-2.7 X4643V8-2.7 X4643V8I-2.7
Part Number RESET (Active HIGH)
X4645S8-4.5A X4645S8I-4.5A X4645V8-4.5A X4645V8I-4.5A X4645S8 X4645S8I X4645V8 X4645V8I X4645S8-2.7A X4645S8I-2.7A X4645V8-2.7A X4645V8I-2.7A X4645S8-2.7 X4645S8I-2.7 X4645V8-2.7 X4645V8I-2.7
4.5-5.5V
4.25-4.5
8L SOIC 8L TSSOP
2.7-5.5V
2.85-3.0
8L SOIC 8LTSSOP
2.7-5.5V
2.55-2.7
8L SOIC 8L TSSOP
Part Mark Information
8-Lead TSSOP EYWW XXXXX ADB/ADK = -4.5A (0 to +70C) ADD/ADM = No Suffix (0 to +70C) ADF/ADO = -2.7A (0 to +70C) ADH/ADQ= -2.7 (0 to +70C) 4283/4285
8-Lead SOIC/PDIP X4643/5 X XX Blank = 8-Lead SOIC
AL = -4.5A (0 to +70C) AM = -4.5A (-40 to +85C) Blank = No Suffix (0 to +70C) I = No Suffix (-40 to +85C) AN = -2.7A (0 to +70C) AP = -2.7A (-40 to +85C) F = -2.7 (0 to +70C) G = -2.7 (-40 to +85C)
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements 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 Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 21
FN8123.0 March 29, 2005

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