SGM4551B [SGMICRO]
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator;
| 型号： | SGM4551B |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator |
| 文件： | 总7页 (文件大小：455K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM4551B
Dual Bidirectional I2C Bus and
SMBus Voltage-Level Translator
GENERAL DESCRIPTION
The SGM4551B is a 2-bit, SMbus, dual, bidirectional, I2C
For the application of standard I2C, the pull-up resistor is
required for the logic high levels, which means that the
operation for I2C in this case is open-drain. Each side of the
repeater requires a pull-up resistor and the value of resistor
depends on the operation of SGM4551B. Also, when multiple
masters are connected with SGM4551B, the standard
operation current is 3mA, and high current can be taken into
account under the specific conditions.
voltage translator with the ability of enable (EN) function. For
VREF1, the typical operation range is from 1.2V to 3.3V and the
typical operation for VREF2 is from 1.8V to 5.5V.
The signal can be transmitted bilaterally from 1.2V to 5V. The
propagation delay is significant small as the low on-resistance
of SGM4551B. Also, if the EN pin is in high position, the
voltage translator is transparent and then it allows the
connection between SCL1 and SCL2, SDA1 and SDA2
respectively. In addition, in this state, the transmitting
direction is bidirectional. However, the transmitting will be
suspended if the EN pin is in low state as the high-impedance
property at this moment.
The resistance between SDA1 and SDA2 is low when the
state of them is low. However, if the state of SDA1 or SDA2 is
high, the level of high position depends on the corresponding
voltage reference. In the transparent mode, when the position
of SDA1 is high, SDA2 must be pulled to a high level through
the pull-up resistor. In addition, the transition for high and low
voltage is seamless which can be selected by the users.
For the applications, the connections of the devices and bus
length are limited as the 400pF capacitance of the bus pin.
However, SGM4551B allows the isolation between two sides
of I2C bus so that more and more I2C devices can be added
and connected with SGM4551B.
Because of the same electrical characteristics for all the
outputs of SGM4551B, so that the deviations of the
propagation delay and voltage is extremely small. In addition,
this advantage is good for the transition of discrete transistors
as the symmetrical switch inside SGM4551B. On top of this,
SGM4551B can also provide the protection of ESD for the
devices with weak ESD ability.
Two different kinds of bus frequencies are supported by
SGM4551B, one is 400kHz and the other is 100kHz. Also, if
two frequencies for the buses are required, the priority of
400kHz should be always higher than that of 100kHz.
Because of the adding of the additional delay, the operational
frequency of the device must be lower than 400kHz if the
frequency of the master is equal to 400kHz.
The SGM4551B is available in a Green SOT-23-8 package. It
operates over an ambient temperature range of -40℃ to
+85℃.
SG Micro Corp
FEBRUARY2015–REV. A
www.sg-micro.com
Dual Bidirectional I2C Bus and
SMBus Voltage-Level Translator
SGM4551B
FEATURES
LOGIC DIAGRAM
● Bidirectional I2C Translator
VREF1
VREF2
● Support I2C and SMBus Compatible
● Propagation Delay: Less than 5.5ns
● Acceptable Voltage Reference
1.2V VREF1 and 1.8V, 2.5V, 3.3V, or 5V VREF2
1.8V VREF1 and 2.5V, 3.3V, or 5V VREF2
2.5V VREF1 and 3.3V or 5V VREF2
3.3V VREF1 and 5V VREF2
SCL1
SDA1
SW
SW
SCL2
SDA2
● Low On-Resistance: 3.5Ω (TYP)
● GPIO Ports with I2C Open-Drain Logic
(SCL1, SDA1, SCL2 and SDA2)
● Mixed-Mode Signal be Supported by I/O Ports
with 5V Tolerant
EN
GND
FUNCTION TABLE
● When EN is Low, SGM4551B is in High-Impedance
Mode
EN (1)
FUNCTION
● Lock-Up-Free Operation for Isolation when EN =
Low
H
L
SCL1 = SCL2, SDA1 = SDA2.
Disconnect.
● The Pinout of the Internal Material is Beneficial
for PCB Layout
NOTE:
1. The transparent mode will be launched if the voltage of EN
pin is 1V higher than the voltage of SCL1 and SCL2. And so
does the condition of SDA. H = HIGH level, L = LOW level.
● Available in a Green SOT-23-8 Package
SG Micro Corp
www.sg-micro.com
FEBRUARY 2015
2
Dual Bidirectional I2C Bus and
SMBus Voltage-Level Translator
SGM4551B
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM4551B
SOT-23-8
SGM4551BYN8G/TR
SZ6XX
Tape and Reel, 3000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Month
Date Code - Year
Serial Number
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
DC Reference Voltage Range
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
V
REF1 .................................................................. -0.3V to 6V
REF2 .................................................................. -0.3V to 6V
V
Input Voltage Range (1), VI ................................... -0.3V to 6V
Input/Output Voltage Range (1), VI/O..................... -0.3V to 6V
Continuous Channel Current ........................................64mA
Input Clamp Current, IIK, (VI < 0)..................................-50mA
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................3000V
MM.................................................................................300V
NOTE:
1. When the input and output current ratings are observed,
the input and I/O negative voltage ratings may be exceeded.
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range.......................-40℃ to +85℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
FEBRUARY 2015
3
Dual Bidirectional I2C Bus and
SMBus Voltage-Level Translator
SGM4551B
PIN CONFIGURATION
(TOP VIEW)
1
2
3
4
8
7
6
5
GND
VREF1
SCL1
SDA1
EN
VREF2
SCL2
SDA2
SOT-23-8
PIN DESCRIPTION
PIN
1
NAME
GND
VREF1
SCL1
SDA1
SDA2
SCL2
VREF2
EN
FUNCTION
Ground.
2
Low-side Reference Supply Voltage for SCL1 and SDA1.
Low-side Clock Signal.
3
4
Low-side Data Signal.
5
High-side Data Signal.
6
High-side Clock Signal.
7
High-side Reference Supply Voltage for SCL2 and SDA2.
Enable Control Pin.
8
SG Micro Corp
www.sg-micro.com
FEBRUARY 2015
4
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-8
D
0.65
0.4
e1
e
E1
E
2.59
0.99
b
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
θ
c
A1
0.2
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
MIN
MAX
0.049
0.004
0.045
0.020
0.008
0.119
0.067
0.116
A
A1
A2
b
1.050
0.000
1.050
0.300
0.100
2.820
1.500
2.650
1.250
0.100
1.150
0.500
0.200
3.020
1.700
2.950
0.041
0.000
0.041
0.012
0.004
0.111
0.059
0.104
c
D
E
E1
e
0.650 BSC
0.975 BSC
0.026 BSC
0.038 BSC
e1
L
0.300
0°
0.600
8°
0.012
0°
0.024
8°
θ
NOTES:
1. Body dimensions do not include mode flash or protrusion.
2. This drawing is subject to change without notice.
SG Micro Corp
TX00035.000
www.sg-micro.com
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOT-23-8
7″
9.5
3.17
3.23
1.37
4.0
4.0
2.0
8.0
Q3
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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