LTC4307-1
High Definition Multimedia
Interface (HDMI) Level-
Shifting 2-Wire Bus Buffer
FEATURES
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DESCRIPTIO
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Bidirectional Buffer for Display Data Channel (DDC)
Compliant with HDMI Specification Version 1.3
DDC Capacitance Requirement
Level Translation Between 3.3V and 5V
±5kV Human Body Model ESD Protection
60mV Buffer Offset Independent of Load
Compatible with Non-Compliant V
OL
I
2
C Devices
Isolates Input SDA and SCL Line from Output
Compatible with I
2
C
TM
, I
2
C Fast Mode and SMBus
READY Open-Drain Output
High Impedance SDA, SCL Pins for V
CC
= 0V
Small 8-Lead (3mm
×
3mm) DFN and 8-Lead MSOP
Packages
The LTC4307-1 is a 2-wire bus buffer that provides ca-
pacitance buffering between input and output. The HDMI
specification requires that devices have less than 50pF of
input capacitance on their DDC bus lines. The LTC4307-1’s
capacitance buffering feature, in conjunction with its
sub-10pF data and clock input capacitance, allows HDMI
components to easily meet the 50pF requirement and
tolerate high capacitance on the internal bus.
The LTC4307-1 also provides level-shifting between 3.3V
and 5V systems to allow lower voltage HDMI transmitters,
receivers and EEPROM to interface to the 5V DDC bus.
READY is an open-drain digital output flag that indicates
whether or not the input and output busses are connected
and can interface to the HDMI hot plug detect (HPD) signal.
When driven high, the ENABLE digital input allows the
LTC4307-1 to connect after a stop bit or bus idle. Driving
ENABLE low breaks the connection between the input and
output busses.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7032051, 6356140, 6650174
APPLICATIO S
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HDMI
3.3V/5V Level Translation
Capacitance Buffer/Bus Extender
TYPICAL APPLICATIO
DVD PLAYER (SOURCE)
TV (SINK)
3.3V
5V
1.8k
HDMI TX
IC
1.8k
EEPROM
0.1μF
10k
10k
200mV/DIV
LTC4307-1
HDMI
CABLE
<50pF
V
CC
SDAIN SDAOUT
SCLIN SCLOUT
DDC GROUND
ENABLE
GND
HDMI RX
IC
μC
43071 TA01a
U
Rising Edge from Asserted Low
1000
800
600
LOW
OFFSET
SDAOUT
SDAIN
200
400
0
0
100
200
300
400
100ns/DIV
500
600
43071 TA01b
U
U
43071fa
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LTC4307-1
ABSOLUTE
AXI U RATI GS
V
CC
to GND ................................................. – 0.3V to 6V
SDAIN, SCLIN, SDAOUT, SCLOUT,
READY, ENABLE .......................................... –0.3V to 6V
Maximum Sink Current (SDAIN, SCLIN, SDAOUT,
SCLOUT, READY) .............................................. 50mA
Operating Temperature Range
LTC4307C ................................................ 0°C to 70°C
LTC4307I .............................................– 40°C to 85°C
PIN CONFIGURATION
TOP VIEW
ENABLE 1
SCLOUT 2
SCLIN 3
GND 4
9
8
7
6
5
V
CC
SDAOUT
SDAIN
READY
ENABLE
SCLOUT
SCLIN
GND
1
2
3
4
TOP VIEW
8
7
6
5
V
CC
SDAOUT
SDAIN
READY
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4307CDD-1#PBF
LTC4307IDD-1#PBF
LTC4307CMS8-1#PBF
LTC4307IMS8-1#PBF
TAPE AND REEL
LTC4307CDD-1#TRPBF
LTC4307IDD-1#TRPBF
LTC4307CMS8-1#TRPBF
LTC4307IMS8-1#TRPBF
PART MARKING*
LDBP
LDBP
LTDBN
LTDBN
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
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/
The
●
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 noted.
SYMBOL
Power Supply
V
CC
I
CC
I
SD
t
IDLE
Positive Supply Voltage
Supply Current
Shutdown Supply Current
Bus Idle Time
V
CC
= 5.5V, V
SCLOUT
= V
SDAOUT
= 0V (Note 5)
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●
ELECTRICAL CHARACTERISTICS
PARAMETER
2
U
W W
W
(Notes 1, 6)
Storage Temperature Range
DFN ....................................................– 65°C to 125°C
MSOP ................................................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 200°C/W
CONDITIONS
MIN
2.3
TYP
MAX
5.5
UNITS
V
mA
μA
μs
8
900
55
95
11
1200
175
V
CC
= 5.5V, ENABLE = GND, SDA, SCL = 5.5V
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●
43071fa
LTC4307-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
THR_ENABLE
I
ENABLE
t
PLH_EN
t
PHL_EN
t
PLH_READY
t
PHL_READY
V
OL_READY
I
OFF_READY
t
PHL
t
PLH
t
FALL
PARAMETER
ENABLE Threshold
ENABLE Input Current
ENABLE Delay Off-On
ENABLE Delay On-Off
READY Delay Off-On
READY Delay On-Off
READY Output Low Voltage
READY Off Leakage Current
SDA/SCL Propagation Delay High to Low
SDA/SCL Propagation Delay Low to High
SDA/SCL Transition Time High to Low
ENABLE from 0V to V
CC
V
CC
= 3.3V (Figure 1)
V
CC
= 3.3V (Note 3) (Figure 1)
V
CC
= 3.3V (Note 3) (Figure 1)
V
CC
= 3.3V (Note 3) (Figure 1)
I
PULLUP
= 3mA, V
CC
= 2.3V
V
CC
= READY = 5.5V
C
LOAD
= 50pF, 2.7k to V
CC
on SDA, SCL,
V
CC
= 3.3V (Notes 2, 3) (Figure 1)
C
LOAD
= 50pF, 2.7k to V
CC
on SDA, SCL,
V
CC
= 3.3V (Notes 2, 3) (Figure 1)
C
LOAD
= 100pF, 10k to V
CC
on SDA, SCL,
V
CC
= 3.3V (Notes 3, 4) (Figure 1)
2.7k to V
CC
on SDA, SCL, V
CC
= 3.3V,
Driven SDA, SCL = 0.2V
Rising Edge
(Note 3)
(Note 3)
SDA, SCL, Pins
SDA, SCL Pins, I
SINK
= 4mA,
SDAIN/SCLIN = 0.2V, V
CC
= 2.7V
2.7k to V
CC
on SDA, SCL, V
CC
= 3.3V,
Driven SDA, SCL = 0.1V
V
ILMAX
f
I2C,MAX
t
BUF
t
HD,STA
t
SU,STA
t
SU,STO
t
HD,DATI
t
SU,DAT
Buffer Input Logic Low Voltage
I
2
C Maximum Operating Frequency
Bus Free Time Between Stop and Start
Condition
Repeated Start Condition Set-Up Time
Stop Condition Set-Up Time
Data Hold Time Input
Data Set-Up Time
V
CC
= 3.3V
(Note 3)
(Note 3)
Timing Characteristics
400
600
1.3
100
0
0
0
100
Note 3:
Determined by design, not tested in production.
Note 4:
Measure points are 0.3 • V
CC
and 0.7 • V
CC
.
Note 5:
I
CC
test performed with connection circuitry active.
Note 6:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise specified.
kHz
μs
ns
ns
ns
ns
ns
●
●
●
●
●
●
●
●
The
●
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 noted.
CONDITIONS
MIN
0.8
TYP
1.4
0.1
95
10
10
10
0.4
0.1
70
10
30
300
±5
MAX
2
±5
UNITS
V
μA
μs
ns
ns
ns
V
μA
ns
ns
ns
Propagation Delay
Input-Output Connection
V
OS
V
THR
V
HYS
C
IN
I
LEAK
V
OL
Input-Output Offset Voltage
SDA, SCL Logic Input Threshold Voltage
SDA, SCL Logic Input Threshold Voltage
Hysteresis
Digital Input Capacitance SDAIN, SDAOUT,
SCLIN, SCLOUT
Input Leakage Current
Output Low Voltage
20
60
100
mV
V
mV
10
±5
0
120
160
0.4
205
1.2
pF
μA
V
mV
V
0.45V
CC
0.55V
CC
0.65V
CC
50
Hold Time After (Repeated) Start Condition (Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
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:
See “Propagation Delays” in the Operations section for a
discussion of t
PHL
and t
PLH
as a function of pull-up resistance and bus
capacitance.
43071fa
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LTC4307-1
TIMING DIAGRAMS
ENABLE, CONNECT, READY Timing
t
PLH_READY
t
PLH_EN
ENABLE
t
PHL_READY
t
PHL_EN
CONNECT
READY
4307 F01a
Rising and Falling Propagation Delay and Rise and Fall Times for SDAIN, SDAOUT and SCLIN, SCLOUT
t
RISE
t
PLH
SDAIN/SCLIN
t
PHL
t
RISE
t
FALL
t
FALL
SDAOUT/SCLOUT
4307 F01b
Figure 1. Timing Diagrams
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LTC4307-1
TYPICAL PERFOR A CE CHARACTERISTICS
I
CC
vs Temperature
8.3
V
CC
= 5.5V
8.0
900
7.7
t
PHL
(ns)
7.4
I
CC
(mA)
7.1
6.8
V
CC
= 2.3V
6.5
6.2
5.9
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
4307 G01
I
SD
(μA)
V
CC
= 3.3V
Input-Output High to Low
Propagation Delay vs C
OUT
130
120
110
t
PHL
(ns)
100
90
80
70
60
0
200
400
600
C
OUT
(pF)
800
1000
4307 G04
C
IN
= 50pF
R
PULLUPIN
= R
PULLUPOUT
= 10k
V
OUT
– V
IN
(mV)
V
CC
= 5.5V
U W
T
A
= 25°C, V
CC
= 3.3V, unless otherwise indicated.
Input-Output High to Low
Propagation Delay vs Temperature
100
V
CC
= 5.5V
80
V
CC
= 2.3V
V
CC
= 3.3V
60
I
SD
vs Temperature
950
V
CC
= 5.5V
850
800
V
CC
= 3.3V
40
750
V
CC
= 2.3V
20
C
IN
= C
OUT
= 50pF
R
PULLUPIN
= R
PULLUPOUT
= 10k
75
100
4307 G02
700
–50
–25
25
50
0
TEMPERATURE (°C)
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4307 G03
Connection Circuitry V
OUT
– V
IN
(V
OS
)
85
75
65
V
CC
= 3.3V
55
45
1
2
3
4
6
7
5
R
PULLUP
(kΩ)
8
9
10
4307 G05
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