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PDF 82B715 Data sheet ( Hoja de datos )
| Número de pieza | 82B715 | |
| Descripción | I2C bus extender | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
82B715
I2C bus extender
Preliminary specification
Supesedes data of 1997 Apr 07
IC20 Data Handbook
Philips
Semiconductors
1998 Jan 09
1 page  
Philips Semiconductors
I2C bus extender
Preliminary specification
82B715
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134).
Voltages with respect to pin GND (DIL-8 pin 4).
SYMBOL
VCC to GND
Vbus
Vbuff
I
Ptot
Tstg
Tamb
PARAMETER
Supply voltage range VCC
Voltage range I2C Bus, SCL or SDA
Voltage range Buffered Bus
DC current (any pin)
Power dissipation
Storage temperature range
Operating ambient temperature range
CHARACTERISTICS
At Tamb = +25°C and VCC = 5 Volts, unless otherwise specified.
SYMBOL
PARAMETER
Power Supply
VCC Supply voltage (operating)
ICC Supply current
ICC Supply current at VCC = 12V
ICC Supply current, both I2C inputs LOW,
both buffered outputs sinking 30mA.
Drive Currents
ISx, ISy
Output sink on I2C bus
VSx, VSy LOW = 0.4V
VLx, VLy LOW on Buffered bus = 0.3V
ILx, ILy
Output sink on Buffered bus
VLx, VLy LOW = 0.4V
VSx, VSy LOW on I2C bus = 0.3V
Input Currents
ISx, ISy
Input current from I2C bus when
ILx, ILy sink on Buffered bus = 30mA
ILx, ILy
Input current from Buffered bus when
ISx, ISy sink on I2C bus = 3mA
ILx, ILy
Leakage current on Buffered bus
VLx, VLy = VCC, and VSx, VSy = VCC
Impedance Transformation
Zin/Zout
Input/Output impedance
LIMITS
MIN.
MAX.
–0.3 +12
0 VCC
0 VCC
60
300
–55 +125
–40 +85
UNIT
V
V
V
mA
mW
°C
°C
MIN.
4.5
—
—
—
LIMITS
TYP.
—
16
22
28
MAX.
12
—
—
—
UNIT
V
mA
mA
mA
3 — — mA
30 — — mA
——
3 mA
——
3 mA
— — 200 µA
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 I2C bus
capacitances have effectively 10 times their I2C bus value.
In practical systems the pull-up resistance is determined by the rise
time limit for I2C 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 I2C 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:
R
+
1m sec
Cdevice ) Cwiring
Where: Cdevice = sum of device capacitances connected to each
bus,
and Cwiring = 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.
1998 Jan 09
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 82B715.PDF ] | |
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