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參數(shù)資料
| 型號(hào)： | P82B715 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | I2C bus extender |
| 中文描述： | I2C總線擴(kuò)展 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 96K |
| 代理商： | P82B715 |
Philips Semiconductors
Preliminary specification
82B715
I
2
C bus extender
1998 Jan 09
5
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134).
Voltages with respect to pin GND (DIL-8 pin 4).
LIMITS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
CC
to GND
V
bus
V
buff
I
Supply voltage range V
CC
Voltage range I
2
C Bus, SCL or SDA
–0.3
+12
V
0
V
CC
V
CC
60
V
Voltage range Buffered Bus
0
V
DC current (any pin)
mA
P
tot
T
stg
T
amb
Power dissipation
300
mW
°
C
°
C
Storage temperature range
–55
+125
Operating ambient temperature range
–40
+85
CHARACTERISTICS
At T
amb
= +25
°
C and V
CC
= 5 Volts, unless otherwise specified.
LIMITS
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
Power Supply
V
CC
I
CC
I
CC
I
CC
Supply voltage (operating)
4.5
—
12
V
Supply current
—
16
—
mA
Supply current at V
CC
= 12V
Supply current, both I
2
C inputs LOW,
both buffered outputs sinking 30mA.
—
22
—
mA
—
28
—
mA
Drive Currents
I
Sx
, I
Sy
Output sink on I
2
C bus
V
Sx
, V
Sy
LOW = 0.4V
V
Lx
, V
Ly
LOW on Buffered bus = 0.3V
Output sink on Buffered bus
V
Lx
, V
Ly
LOW = 0.4V
V
Sx
, V
Sy
LOW on I
2
C bus = 0.3V
3
—
—
mA
I
Lx
, I
Ly
30
—
—
mA
Input Currents
I
Sx
, I
Sy
Input current from I
2
C bus when
I
Lx
, I
Ly
sink on Buffered bus = 30mA
Input current from Buffered bus when
I
Sx
, I
Sy
sink on I
2
C bus = 3mA
Leakage current on Buffered bus
V
Lx
, V
Ly
= V
CC
, and V
Sx
, V
Sy
= V
CC
Impedance Transformation
Z
in
/Z
out
Input/Output impedance
—
—
3
mA
I
Lx
, I
Ly
—
—
3
mA
I
Lx
, I
Ly
—
—
200
μ
A
8
10
13
Pull-Up Resistance Calculation
In calculating the pull-up resistance values, the gain of the buffer
introduces scaling factors which must be applied to the system
components. Viewing the system from the Buffered bus, all I
2
C bus
capacitances have effectively 10 times their I
2
C bus value.
In practical systems the pull-up resistance is determined by the rise
time limit for I
2
C systems. As an approximation this limit will be
satisfied if the time constant (product of the net resistance and net
capacitance) of the total system is set to 1 microsecond.
The total time constant may either be set by considering each bus
node individually (i.e., the I
2
C nodes, and the Buffered bus node)
and choosing pull-up resistors to give time constants of 1
microsecond for each node; or by combining the capacitances into
an equivalent capacitive loading on the Buffered bus, and
calculating the Buffered bus pull-up resistor required by this
equivalent capacitance.
For each separate bus the pull-up resistor may be calculated as
follows:
1 sec
C
device
C
wiring
R
Where: C
device
= sum of device capacitances connected to each
bus,
and C
wiring
= total wiring and stray capacitance on each bus.
If these capacitances are not known then a good approximation is to
assume that each device presents 10pF of load capacitance and
10pF of wiring capacitance.
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| P82B715D | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715D | 制造商:Texas Instruments 功能描述:IC I2C BUS EXTENDER 8-SOIC |
| P82B715DG4 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715DR | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715DRG4 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
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