DATASHEET
X4043, X4045
FN8118
Rev 3.00
December 9, 2015
4k, 512 x 8 Bit CPU Supervisor with 4kbit EEPROM
FEATURES
DESCRIPTION
• Selectable watchdog timer
• Low VCC detection and reset assertion
—Five standard reset threshold voltages
—Adjust low VCC reset threshold voltage using
special programming sequence
—Reset signal valid to VCC = 1V
• Low power CMOS
— MDE+
Actual VTRIP –
Desired VTRIP
= Error
| Error | < | MDE |
DONE
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 user must issue a stop after sending this byte to the
register to initiate the nonvolatile cycle that stores WD1,
WD0, BP2, BP1, and BP0. The X4043/45 will not
acknowledge any data bytes written after the first byte is
entered.
The control register is accessed with a special preamble
in the slave byte (1011) and is located at address 1FFh.
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".
FN8118 Rev 3.00
December 9, 2015
Page 8 of 24
X4043, X4045
The state of the control register can be read at any time
by performing a random read at address 1FFh, using the
special preamble. Only one byte is read by each register
read operation. The X4043/45 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.
WD1, WD0: Watchdog Timer Bits
The bits WD1 and WD0 control the period of the watchdog timer. The options are shown below.
WD1
WD0
Watchdog Time Out Period
0
0
1.4 seconds
600 milliseconds
0
1
7
6
5
4
3
2
1
0
1
0
200 milliseconds
0
WD1
WD0
BP1
BP0
RWEL
WEL
BP2
1
1
Disabled (factory setting)
RWEL: Register Write Enable Latch (Volatile)
Writing to the Control Register
The RWEL bit must be set to “1” prior to a write to the
Control Register.
Changing any of the nonvolatile bits of the control register requires the following steps:
WEL: Write Enable Latch (Volatile)
– 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).
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 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.
BP2, BP1, BP0: Block Protect Bits (Nonvolatile)
BP2
BP1
BP0
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 one of eight segments of the array.
Protected Addresses
(Size)
0
0
0
None (factory setting)
None
0
0
1
180h - 1FFh (128 bytes)
Upper 1/4 (Q4)
0
1
0
100h - 1FFh (256 bytes)
Upper 1/2 (Q3,Q4)
Array Lock
0
1
1
000h - 1FFh (512 bytes)
Full Array (All)
1
0
0
000h - 00Fh (16 bytes)
First Page (P1)
1
0
1
000h - 01Fh (32 bytes)
First 2 pgs (P2)
1
1
0
000h - 03Fh (64 bytes)
First 4 pgs (P4)
1
1
1
000h - 07Fh (128 bytes)
First 8 pgs (P8)
FN8118 Rev 3.00
December 9, 2015
– 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.
– 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.
Page 9 of 24
X4043, X4045
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 trans-
fers, 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 6.
Figure 6. Valid Data Changes on the SDA Bus
SCL
SDA
Data Stable
Data Change
Data Stable
Serial Start Condition
Serial Stop 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
7.
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.
Figure 7. Valid Start and Stop Conditions
SCL
SDA
Start
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 8.
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 will
FN8118 Rev 3.00
December 9, 2015
Stop
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.
Page 10 of 24
X4043, X4045
Figure 8. Acknowledge Response From Receiver
SCL from
Master
1
8
9
Data Output
from
Transmitter
Data Output
from Receiver
Start
Acknowledge
Operational Notes
X4043/45 ADDRESSING
The device powers-up in the following state:
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 and ‘1011’ to access the control register.
– 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 signal is active for tPURST.
– two bits of ‘0’.
– one bit that becomes the MSB of the 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 8.
– 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.
Slave Address Byte
Slave Byte
1
0
1
0
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 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 10.
A write to a protected block of memory will suppress the
acknowledge bit.
Figure 9. X4043/45 Addressing
Array
Control Reg.
– The device is in the low power standby state.
1
1
0
1
0
0
A8
R/W
A5
A4
A3
A2
A1
A0
Word Address
A7
FN8118 Rev 3.00
December 9, 2015
A6
Page 11 of 24
X4043, X4045
Figure 10. Byte Write Sequence
Signals from
the Master
S
t
a
r
t
Byte
Address
Slave
Address
SDA Bus
S
t
o
p
Data
0
A
C
K
Signals from
the Slave
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 counter reaches
the end of the page, it “rolls over” and goes back to ‘0’ on
A
C
K
A
C
K
the same page. This means that the master can write 16
bytes to the page starting at any location on that page. If
the master begins writing at location 10, and loads 12
bytes, then the first 5 bytes are written to locations 10
through 15, and the last 7 bytes are written to locations 0
through 6. Afterwards, the address counter would point
to location 7 of the page that was just written. If the master supplies more than 16 bytes of data, then new data
over-writes the previous data, one byte at a time.
Figure 11. Page Write Operation
Signals from
the Master
S
t
a
r
t
SDA Bus
Signals from
the Slave
(1 n 16)
Slave
Address
S
t
o
p
Data
(n)
Data
(1)
Byte
Address
0
A
C
K
A
C
K
A
C
K
A
C
K
Figure 12. Writing 12-bytes to a 16-byte page starting at location 10
5 Bytes
7 Bytes
Address
=6
Address Pointer
Ends Here
Addr = 7
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 11 for the address, acknowledge, and
data transfer sequence.
FN8118 Rev 3.00
December 9, 2015
Address
10
Address
n-1
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.
Page 12 of 24
X4043, X4045
Figure 13. Acknowledge Polling Sequence
Acknowledge Polling
The disabling of the inputs during nonvolatile cycles can
be used to take advantage of the typical 5kHz 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 13.
Byte Load Completed
by Issuing STOP.
Enter ACK Polling
Issue START
Issue Slave Address
Byte (Read or Write)
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.
YES
Nonvolatile Cycle
Complete. Continue
Command
Current Address Read
NO
Issue STOP
YES
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.
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 13 for the address,
acknowledge, and data transfer sequence.
NO
ACK
Returned?
Serial Read Operations
Issue STOP
Continue Normal Read
or Write Command
Sequence
PROCEED
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.
Figure 14. Current Address Read Sequence
Signals from
the Master
SDA Bus
Signals from
the Slave
FN8118 Rev 3.00
December 9, 2015
S
t
a
r
t
S
t
o
p
Slave
Address
1
A
C
K
Data
Page 13 of 24
X4043, X4045
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 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
15 for the address, acknowledge, and data transfer
sequence.
Figure 15. Random Address Read Sequence
Signals from
the Master
S
t
a
r
t
SDA Bus
S
t
a
r
t
Byte
Address
Slave
Address
1
0
A
C
K
Signals from
the Slave
S
t
o
p
Slave
Address
A
C
K
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 14.
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, the mas-
A
C
K
Data
ter 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 16 for the acknowledge and data transfer sequence.
Figure 16. Sequential Read Sequence
Signals from
the Master
Slave
Address
SDA Bus
1
Signals from
the Slave
A
C
K
A
C
K
Data
(1)
A
C
K
Data
(2)
S
t
o
p
A
C
K
Data
(n-1)
Data
(n)
(n is any integer greater than 1)
FN8118 Rev 3.00
December 9, 2015
Page 14 of 24
X4043, X4045
Data Protection
The following circuitry has been included to prevent
inadvertent writes:
Symbol Table
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
– The WP pin, when held HIGH, prevents all writes to
the array and the control register.
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
– Communication to the device is inhibited as a result of
a low voltage condition (VCC < VTRIP)any in-progress
communication is terminated.
N/A
Center Line
is High
Impedance
– 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.
WAVEFORM
– Block lock bits can protect sections of the memory
array from write operations.
FN8118 Rev 3.00
December 9, 2015
Page 15 of 24
X4043, X4045
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias ................... -65°C to +135°C
Storage temperature ........................ -65°C to +150°C
Voltage on any pin with
respect to VSS ...................................... -1.0V to +7V
D.C. output current ............................................... 5mA
Lead temperature (soldering, 10 seconds) ........ 300°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. This
is a stress rating only; the 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.
0°C
-40°C
Max.
70°C
+85°C
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
Max.
Unit
Active supply current read
1.0
mA
Active supply current write
3.0
mA
Standby current AC (WDT off)
1
µA
VIL = VCC x 0.1, VIH = VCC x 0.9
fSCL= 400kHz, SDA = open
VCC = 1.22 x VCC min
ISB2(2)
Standby current DC (WDT off)
1
µA
VSDA = VSCL = VSB
Others = GND or VSB
ISB3(2)
Standby current DC (WDT on)
20
µA
VSDA =VSCL = VSB
Others = GND or VSB
ILI
Input leakage current
10
µA
VIN = GND to VCC
ILO
Output leakage current
10
µA
VSDA = GND to VCC
device is in standby
Symbol
ICC1
(1)
ICC2
(1)
(2)
ISB1
Parameter
Min.
VIL(3)
Input LOW voltage
-0.5
VCC x 0.3
V
VIH(3)
Input nonvolatile
VCC x 0.7
VCC + 0.5
V
VHYS
Schmitt trigger input hysteresis
Fixed input level
VCC related level
0.2
.05 x VCC
VOL
Output LOW voltage
Test Conditions
VIL = VCC x 0.1, VIH = VCC x 0.9
fSCL = 400kHz
V
V
0.4
V
IOL = 3.0mA (2.7-5.5V)
IOL = 1.8mA (2.0-3.6V)
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.
FN8118 Rev 3.00
December 9, 2015
Page 16 of 24
X4043, X4045
CAPACITANCE (TA = 25°C, f = 1.0 MHz, VCC = 5V)
Symbol
COUT
(4)
CIN(4)
Parameter
Max.
Unit
Test Conditions
Output capacitance (SDA, RESET/RESET)
8
pF
VOUT = 0V
Input capacitance (SCL, WP)
6
pF
VIN = 0V
Notes: (4) This parameter is periodically sampled and not 100% tested.
EQUIVALENT A.C. LOAD CIRCUIT
A.C. TEST CONDITIONS
5V
5V
1533
For VOL= 0.4V
and IOL = 3 mA
SDA
4.6k
Input pulse levels
0.1 VCC to 0.9 VCC
Input rise and fall times
10ns
Input and output timing levels
0.5 VCC
Output load
Standard output load
RESET
100pF
100pF
A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified)
100kHz
Symbol
fSCL
Parameter
SCL clock frequency
400kHz
Min.
Max.
Min.
Max.
Unit
0
100
0
400
kHz
tIN
Pulse width suppression time at inputs
n/a
n/a
50
0.9
0.1
ns
tAA
SCL LOW to SDA data out valid
0.1
tBUF
Time the bus free before start of new transmission
4.7
1.3
µs
tLOW
Clock LOW time
4.7
1.3
µs
tHIGH
Clock HIGH time
4.0
0.6
µs
tSU:STA
Start condition setup time
4.7
0.6
µs
tHD:STA
Start condition hold time
4.0
0.6
µs
tSU:DAT
Data in setup time
250
100
ns
tHD:DAT
Data in hold time
5.0
0
µs
tSU:STO
0.9
µs
Stop condition setup time
0.6
0.6
µs
tDH
Data output hold time
50
50
ns
tR
SDA and SCL rise time
1000
20 + .1Cb(6)
300
ns
tF
SDA and SCL fall time
300
20 + .1Cb(6)
300
ns
tSU:WP
WP setup time
0.4
0.6
s
tHD:WP
WP hold time
0
0
s
Cb
Capacitive load for each bus line
400
400
pF
Notes: (5) Typical values are for TA = 25°C and VCC = 5.0V
(6) Cb = total capacitance of one bus line in pF.
FN8118 Rev 3.00
December 9, 2015
Page 17 of 24
X4043, X4045
TIMING DIAGRAMS
Bus Timing
tHIGH
tF
SCL
tLOW
tR
tSU:DAT
tSU:STA
tHD:DAT
tHD:STA
SDA IN
tSU:STO
tAA
tDH
tBUF
SDA OUT
WP Pin Timing
START
SCL
Clk 1
Clk 9
Slave Address Byte
SDA IN
tSU:WP
tHD:WP
WP
Write Cycle Timing
SCL
SDA
8th Bit of Last Byte
ACK
tWC
Stop
Condition
Start
Condition
Nonvolatile Write Cycle Timing
Symbol
tWC(7)
Parameter
Write cycle time
Min.
Typ.(7)
Max.
Unit
5
10
ms
Notes: (7) 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.
FN8118 Rev 3.00
December 9, 2015
Page 18 of 24
X4043, X4045
Power-Up and Power-Down Timing
VTRIP
VCC
tPURST
0 Volts
tR
tPURST
tF
tRPD
VRVALID
RESET
(X4043)
VRVALID
RESET
(X4045)
RESET Output Timing
Symbol
Parameter
Min.
Typ.
Max.
Unit
VTRIP
Reset trip point voltage, X4043/45-4.5A
Reset trip point voltage, X4043/45
Reset trip point voltage, X4043/45-2.7A
Reset trip point voltage, X4043/45-2.7
4.5
4.25
2.85
2.55
4.62
4.38
2.92
2.62
4.75
4.5
3.0
2.7
V
tPURST
Power-up reset time out
100
200
400
ms
tRPD(8)
VCC detect to RESET/RESET
10
20
µs
tF(8)
tR
(8)
VRVALID
VCC fall time
20
mV/µs
VCC rise time
20
mV/µs
Reset valid VCC
1
V
tWDO
Watchdog time out period,
WD1 = 1, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 0, WD0 = 0
tRSP
Watchdog Time Restart pulse width
tRST
Reset time out
100
450
1
200
600
1.4
300
800
2
1
100
ms
ms
sec
µs
200
400
ms
Notes: (8) This parameter is periodically sampled and not 100% tested.
FN8118 Rev 3.00
December 9, 2015
Page 19 of 24
X4043, X4045
Watchdog Time Out For 2-Wire Interface
Start
Clockin (0 or 1)
tRSP
Start
< tWDO
SCL
SDA
tRST
(4043) RESET
tWDO
tRST
WDT
Restart
Start
Minimum Sequence to Reset WDT
SCL
SDA
VTRIP Set/Reset Conditions
VCC
(VTRIP)
tTHD
VP
tTSU
WP
tVPS
tVPH
SCL
7
0
0
7
0
tVPO
7
SDA
A0h
Start
01h* sets VTRIP
03h* resets VTRIP
00h
tWC
* all others reserved
FN8118 Rev 3.00
December 9, 2015
Page 20 of 24
X4043, X4045
VTRIP Programming Specifications: VCC = 2.0-5.5V; Temperature = 25°C
Parameter
Description
Min.
Max.
Unit
tVPS
WP Program Voltage Setup time
10
µs
tVPH
WP Program Voltage Hold time
10
µs
tTSU
VTRIP Level Setup time
10
µs
tTHD
VTRIP Level Hold (stable) time
10
µs
tWC
VTRIP Program Cycle
10
ms
tVPO
Program Voltage Off time before next cycle
1
ms
VP
Programming Voltage
15
18
V
VTRIP Set Voltage Range
2.0
4.75
V
Vtv
VTRIP Set Voltage variation after programming (-40 to +85°C).
-25
+25
mV
tVPS
WP Program Voltage Setup time
10
VTRAN
µs
REVISION HISTORY
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to the web to make sure that
you have the latest revision.
DATE
REVISION
December 9, 2015
FN8118.3
CHANGE
Updated Ordering Information Table on page 2.
Added Revision History and About Intersil sections.
ABOUT INTERSIL
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support
© Copyright Intersil Americas LLC 2005-2015. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets 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
FN8118 Rev 3.00
December 9, 2015
Page 21 of 24
X4043, X4045
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
0.050"
Typical
0° - 8°
0.0075 (0.19)
0.010 (0.25)
0.250"
0.016 (0.410)
0.037 (0.937)
FOOTPRINT
0.030"
Typical
8 Places
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
FN8118 Rev 3.00
December 9, 2015
Page 22 of 24
X4043, X4045
PACKAGING INFORMATION
8-Lead Miniature Small Outline Gull Wing Package Type M
0.118 ± 0.002
(3.00 ± 0.05)
0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)
0.0256 (0.65) Typ.
R 0.014 (0.36)
0.118 ± 0.002
(3.00 ± 0.05)
0.030 (0.76)
0.0216 (0.55)
0.036 (0.91)
0.032 (0.81)
0.040 ± 0.002
(1.02 ± 0.05)
7° Typ.
0.008 (0.20)
0.004 (0.10)
0.0256" Typical
0.007 (0.18)
0.005 (0.13)
0.150 (3.81)
Ref.
0.193 (4.90)
Ref.
0.025"
Typical
0.220"
FOOTPRINT
0.020"
Typical
8 Places
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
FN8118 Rev 3.00
December 9, 2015
Page 23 of 24
X4043, X4045
PACKAGING INFORMATION
8-Lead Plastic Dual In-Line Package Type P
0.430 (10.92)
0.360 (9.14)
0.260 (6.60)
0.240 (6.10)
Pin 1 Index
Pin 1
0.300
(7.62) Ref.
Half Shoulder Width On
All End Pins Optional
0.145 (3.68)
0.128 (3.25)
Seating
Plane
0.025 (0.64)
0.015 (0.38)
0.065 (1.65)
0.045 (1.14)
0.150 (3.81)
0.125 (3.18)
0.110 (2.79)
0.090 (2.29)
.073 (1.84)
Max.
Typ. 0.010 (0.25)
0.060 (1.52)
0.020 (0.51)
0.020 (0.51)
0.016 (0.41)
0.325 (8.25)
0.300 (7.62)
0°
15°
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
FN8118 Rev 3.00
December 9, 2015
Page 24 of 24