SCLINn, SCLOUTn, SDAINn, SDAOUTn ........ –0.3V to 6V
Operating Temperature Range
LTC4318C ................................................ 0°C to 70°C
LTC4318I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
20 19 18 17 16
XORH2 1
XORL2 2
XORH1 3
XORL1 4
V
CC
5
UF PACKAGE
20-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 150°C,θ
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, PCB CONNECTION OPTIONAL
orDer inForMaTion
LEAD FREE FINISH
LTC4318CUF#PBF
LTC4318IUF#PBF
TAPE AND REEL
LTC4318CUF#TRPBF
LTC4318IUF#TRPBF
PART MARKING*
4318
4318
PACKAGE DESCRIPTION
20-Lead (4mm × 4mm) Plastic QFN
20-Lead (4mm × 4mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
4318fa
For more information
www.linear.com/LTC4318
LTC4318
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise specified.
SYMBOL
Supply
V
CC
I
CC
V
CC(UVLO)
V
CC(HYST)
ENABLE and READY
V
ENABLE(TH)
V
ENABLE(HYST)
I
ENABLE(LEAK)
V
READY(OL)
I
READY(OH)
V
SCL,SDA(TH)
V
SCL,SDA(HYST)
I
SCL,SDA(LEAK)
ENABLE Threshold Voltage
ENABLE Hysteresis
ENABLE Input Current
READY Output Low Voltage
READY Off Leakage Current
Threshold Voltage
Hysteresis
Leakage Current
SDA, SCL Pins = 5.5V, 0V, V
CC
= 5.5V,0V
SDAIN, SCLIN Pins = 5.5V, V
CC
= 5.5V,
SDAOUT, SCLOUT Pins = 4.5V
Note 3
I = 4mA
V
CC
= 2.25V, SCLIN = SDAIN = 0.4V
V
CC
= 3.3V, SCLIN = SDAIN = 0.4V
V
CC
= 5V, SCLIN = SDAIN = 0.4V
l
l
l
l
l
l
l
l
l
elecTrical characTerisTics
PARAMETER
Input Supply Range
Input Supply Current
V
CC
Supply Undervoltage Lockout
CONDITIONS
l
MIN
2.25
TYP
MAX
5.5
UNITS
V
mA
µA
V
mV
ENABLE = 3.3V, SCLIN = SDAIN = 0V
ENABLE = 0V, SCLIN = SDAIN = 0V
V
CC
Rising
l
l
l
0.8
350
1.9
2.1
100
2
800
2.2
V
CC
Supply Undervoltage Lockout Hysteresis
Enable Rising
l
1
1.4
50
1.8
±1
0.4
±5
V
mV
µA
V
µA
V
mV
µA
µA
pF
V
V
Ω
Ω
Ω
nA
kHz
I = 3mA
V
CC
= V
READY
= 5.5V
SDA, SCL Pins Rising
l
l
SCLIN, SDAIN, SCLOUT, SDAOUT
l
1.5
1.8
50
2.0
±10
±10
10
I
SCL,SDA(LEAK-INOUT)
Input to Output Leakage Current
C
SCL,SDA
V
SCL,SDA(PRE)
V
SDAOUT(OL)
R
DS(ON)
XORH, XORL
I
XORH/XORL
I
2
C Interface Timing
f
SCL(MAX)
t
PDHL(SDAOUTn)
t
f(SDAOUTn)
t
TIMEOUT
t
IDLE
t
GLITCH
Maximum SCLIN Clock Frequency
SDAOUT Fall Delay
SDAOUT Fall Time
Stuck Bus Timeout
Bus Idle Time
SCLIN and SDAIN Glitch Filter
XORH and XORL Input Current
Pin Capacitance
Precharge Voltage
SDAOUT Output Low Voltage
Pass Switch On Resistance
0.8
1
3
2.2
1.8
1.2
0.4
12
8
6
±100
l
Note 3
C = 100pF, R
PULLUP
= 10k
C = 100pF, R
PULLUP
= 10k
SCLIN Held Low or High
l
l
l
l
l
l
400
170
20
25
80
50
60
30
120
100
300
300
35
160
ns
ns
ms
µs
ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive and all voltages are referenced to
GND unless otherwise indicated.
Note 3:
Guaranteed by design and not tested.
4318fa
For more information
www.linear.com/LTC4318
3
LTC4318
TiMing DiagraM
SDAIN
50%
70%
50%
30%
4318 EC
SDAOUT
t
PDHL(SDAOUT)
t
f(SDAOUT)
Typical perForMance characTerisTics
Supply Current vs Temperature
1.0
ENABLE = V
CC
800
700
600
I
CC
( A)
V
CC
= 3.3V
V
CC
= 2.25V
0.7
T
A
= 25°C, V
CC
= 3.3V unless otherwise noted.
Pass Switch-On Resistance vs
V
CC
SDAIN = SCLIN = 0.4V
Standby Supply Current vs
Temperature
ENABLE = 0V
6
5
4
R
DS(ON)
( )
3
2
1
0.9
V
CC
= 5V
I
CC
(mA)
0.8
500
400
300
200
100
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
0.6
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4318 G01
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4318 G02
0
2.0
2.5
3.0
3.5
V
CC
(V)
4.0
4.5
5.0
4318 G03
Pass Switch-On Resistance vs
Temperature
6
5
V
READY(OL)
(mV)
4
R
DS(ON)
( )
3
2
1
0
–50
SDAIN = SCLIN = 0.4V
100
READY Output Low
Voltage vs Current
V
CC
= 3.3V
240
220
t
PDHL(SDAOUT)
(ns)
T
A
= 85°C
T
A
= 25°C
200
180
160
140
120
0
2
6
I
READY
(mA)
4
8
10
4318 G05
SDAOUT Fall Delay vs
Temperature
V
CC
= 3.3V
C = 100pF
80
V
CC
= 2.25V
V
CC
= 3.3V
V
CC
= 5V
60
40
T
A
= –40°C
20
–25
0
25
50
TEMPERATURE (°C)
75
100
4318 G04
0
100
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4318 G06
4
4318fa
For more information
www.linear.com/LTC4318
LTC4318
Typical perForMance characTerisTics
SDAOUT Fall Delay vs Bus
Capacitance
300
275
250
t
PDHL(SDAOUT)
(ns)
225
200
175
150
125
100
0
200
400
600
C
BUS
(pF)
800
1000
4318 G07
T
A
= 25°C, V
CC
= 3.3V unless otherwise noted.
SDAOUT Fall Time vs Bus
Capacitance
120
SDAOUT Fall Time vs
Temperature
120
C = 100pF
100
V
CC
= 5V
t
f(SDAOUT)
(ns)
V
CC
= 3.3V
V
CC
= 2.25V
80
V
CC
= 5V
t
f(SDAOUT)
(ns)
100
V
CC
= 5V
80
V
CC
= 3.3V
60
V
CC
= 2.25V
60
V
CC
= 3.3V
40
V
CC
= 2.25V
40
20
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4318 G08
20
0
200
400
600
C
BUS
(pF)
800
1000
4318 G09
pin FuncTions
XORL1/XORL2:
Translator XOR Lower Nibble Configura-
tion Input. The DC voltage at this pin configures the lower
4-bit nibble of the address translation byte. Tie the pin to
an external resistive divider connected between V
CC
and
GND to set the desired DC voltage.
XORH1/XORH2:
Translator XOR Upper Nibble Configura-
tion Input. The DC voltage at this pin configures the upper
3-bit nibble of the address translation byte. Tie the pin to
an external resistive divider connected between V
CC
and
GND to set the desired DC voltage. Connect this pin to V
CC
to activate pass-through mode. See Application Informa-
tion section for more details.
ENABLE1/ENABLE2:
Enable Input. If ENABLE pin is low,
the address translation is disabled, SDAIN is disconnected
from SDAOUT, and SCLIN is disconnected from SCLOUT.
A low to high transition on ENABLE restarts the configura-
tion of the address translation byte and also enables the
address translation. Connect to V
CC
if unused.
Exposed Pad:
Exposed pad may be left open or connected
to device GND.
GND:
Device Ground.
READY1/READY2:
Ready Status Output. This is an open
drain output to indicate that the device is ready for address
translation. The pin releases high when the LTC4318 has
completed configuration of the address translation byte,
SDAIN is connected to SDAOUT and SCLIN is connected
to SCLOUT. Connect a pull-up resistor, typically 10k, from
this pin to the bus pull-up supply. Leave open or tie to
GND if unused.
SCLIN1/SCLIN2:
Input Bus Clock Input and Output. Con-
nect this pin to the SCL line on the master side. An external
pull-up resistor or current source is required. Connect to
V
CC
through a pull-up resistor if unused.
SCLOUT1/SCLOUT2:
Output Bus Clock Input and Output.
Connect this pin to the SCL line on the slave side. An external
pull-up resistor or current source is required. Connect to
V
CC
through a pull-up resistor if unused.
SDAIN1/SDAIN2:
Input Bus Data Input and Output. Connect
this pin to the SDA line on the master side. An external
pull-up resistor or current source is required. Connect to
V
CC
through a pull-up resistor if unused.
SDAOUT1/SDAOUT2:
Output Bus Data Input and Output.
Connect this pin to the SDA line on the slave side. An
external pull-up resistor or current source is required.
Connect to V
CC
through a pull-up resistor if unused.
V
CC
:
Power Supply Input (2.25V to 5.5V). If the supply
voltages for the input and output buses are different, con-
nect this pin to the lower supply. If the input and output
supplies have the same nominal value and with tolerance
As time goes by, people are increasingly concerned about their own and their families' health. However, existing monitoring devices for individual vital signs have struggled to gain market share du...[详细]
我最近在《华尔街日报》看到一篇题为“我们需要能维修自己的电子小玩意儿的权利(We need the right to repair our gadgets)”的文章(参考原文：)，作者对于众多电子产品看来是“有计画的废弃(planned obsolescence)”之现象非常愤怒，认为大众应该要求电子产品可以被维修。 但实际的情况是，举例来说，家家都有的电视机如果故障了，修理费用可能...[详细]
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