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PCA9515D 데이터시트 PDF




NXP Semiconductors에서 제조한 전자 부품 PCA9515D은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 PCA9515D 기능
기능 I2C-bus repeater
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PCA9515D 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
PCA9515
I2C-bus repeater
Product data sheet
Supersedes data of 2003 Nov 10
Philips
Semiconductors
2004 Jun 24




PCA9515D pdf, 반도체, 판매, 대치품
Philips Semiconductors
I2C-bus repeater
Product data sheet
PCA9515
APPLICATION INFORMATION
A typical application is shown in Figure 3. In this example, the
system master is running on a 3.3 V I2C-bus while the slave is
connected to a 5 V bus. Both buses run at 100 kHz unless the slave
bus is isolated and then the master bus can run at 400 kHz. Master
devices can be placed on either bus.
3.3 V
5V
SDA
SCL
BUS
MASTER
400 kHz
SDA0 SDA1
SCL0 SCL1
PCA9515
EN
BUS0
SDA
SCL
SLAVE
100 kHz
BUS1
SW00867
Figure 3. Typical application
The PCA9515 is 5 V tolerant so it does not require any additional
circuitry to translate between the different bus voltages.
When one side of the PCA9515 is pulled LOW by a device on the
I2C-bus, a CMOS hysteresis type input detects the falling edge and
causes an internal driver on the other side to turn on, thus causing
the other side to also go LOW. The side driven LOW by the
PCA9515 will typically be at VOL = 0.5 V.
In order to illustrate what would be seen in a typical application, refer
to Figures 4 and 5. If the bus master in Figure 3 were to write to the
slave through the PCA9515, we would see the waveform shown in
Figure 4 on Bus 0. This looks like a normal I2C transmission until the
falling edge of the 8th clock pulse. At that point, the master releases
the data line (SDA) while the slave pulls it LOW through the
PCA9515. Because the VOL of the PCA9515 is typically around
0.5 V, a step in the SDA will be seen. After the master has
transmitted the 9th clock pulse, the slave releases the data line.
9th CLOCK PULSE
2 V/DIV
VOL OF MASTER
Figure 4. Bus 0 waveform
VOL OF PCA9515
SW00866
2004 Jun 24
4

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PCA9515D 전자부품, 판매, 대치품
Philips Semiconductors
I2C-bus repeater
Product data sheet
PCA9515
AC ELECTRICAL CHARACTERISTICS — PCA9515
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
LIMITS
TYP.
MAX.
UNIT
tPHL Propagation delay
Waveform 1
57 98 170 ns
tPLH Propagation delay
Waveform 1
33 55 78 ns
tTHL Transition time
Waveform 1
— 67 — ns
tTLH Transition time
Waveform 1; Note 1
— 135 — ns
tSET Enable to Start condition
100 —
— ns
tHOLD
Enable after Stop condition
100 —
— ns
NOTE:
1. The tTLH transition time is specified with loads of 1.35 kpull-up resistance and 7 pF load capacitance, plus an additional 50 pF load
capacitance. Different load resistance and capacitance will alter the RC time constant, thereby changing the propagation delay and
transition times.
AC WAVEFORMS
INPUT
1.5 V
tPHL
OUTPUT
80%
tTHL
1.5 V
20%
3.3 V
1.5 V
0.1 V
1.5 V
20%
tPLH
80%
3.3 V
tTLH
VOL
Waveform 1.
SW00646
TEST CIRCUIT
PULSE
GENERATOR
VIN
RT
VCC
VCC
D.U.T.
VOUT
RL
CL
Test Circuit for Open Drain Outputs
DEFINITIONS
RL = Load resistor; 1.35 k
CL = Load capacitance includes jig and probe capacitance;
7 pF
RT = Termination resistance should be equal to ZOUT of
pulse generators.
SW00792
2004 Jun 24
7

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