PCA9527DP,118 NXP Semiconductors, PCA9527DP,118 Datasheet - Page 5

• Manufacturer Part Number: PCA9527DP,118
• Description: IC BUFFER SHIFT DDC 3CH 10-TSSOP
• Manufacturer: NXP Semiconductors
• Type: Bufferr

Specifications of PCA9527DP,118

• Tx/rx Type: I²C Logic
• Delay Time: 115ns
• Capacitance - Input: 8pF
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 100mA
• Mounting Type: Surface Mount
• Package / Case: 10-TSSOP
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: TSSOP
• Rad Hardened: No
• Logic Family: PCA
• Number Of Channels Per Chip: 3
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Interface: DDC, I2C, SMBus
• Minimum Operating Temperature: - 40 C
• Propagation Delay Time: 115 ns
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4770-2

NXP Semiconductors
PCA9527_1
Product data sheet
6.3.1 Port A (SDAA and SCLA)
6.1 Enable
6.2 Rise time accelerators
6.3 Resistor pull-up value selection
crosses the port A threshold ~0.3V
accelerator is turned on, which causes a faster rising edge until it reaches the turn-off
point for the rising edge accelerator ~0.7V
determined by the RC of port A. When the port B driver turns off, port B rises with the RC
of port B.
V
good detect circuit. V
I/Os, and the support functions.
and port B.
The EN pin is active HIGH with an internal ~100 k pull-up to V
to select when the buffer is active. The enable pin puts the PCA9527 in a power-down
state when it is disabled, so that there is a recovery delay and a lower power-down power.
This can be used to isolate the line when the HDMI DDC transmitter or receiver is not
ready, or from a badly behaved slave on power-up until after the system power-up reset. It
should never change state during an I
operation will hang the bus and enabling part way through a bus cycle could confuse the
I
bus and the buffer port are in an idle state to prevent system failures.
PCA9527 has rise time accelerators on port A of SCL and SDA only; the CECA pin does
not have a rise time accelerator. During port A positive bus transitions a current source is
switched on to quickly slew the SDAA and SCLA lines HIGH once the input level of
0.3V
approached.
SDAA and SCLA are open-drain I/O that have rise time accelerators and strong pull-down.
When the inputs transition above 0.3V
the pull-up current during rising edge to meet the I
device drives a long cable or heavier capacitance load. The strong pull-down enables the
output to drive to nearly zero voltage for logic LOW. The selection for pull-up resistors are
defined in the HDMI DDC specification shown in
applications like digital video player, recorder, or set-top box, the pull-up resistor is in the
range of 1.5 k to 2 k . For HDMI receiver applications like in LCD TV or video card, the
pull-up resistor is 47 k on the SCLA line, and there is no pull-up on the SDAA line.
Please refer to
pull-up resistor values (in k ) versus capacitance load (in nF) for 5 V supply voltage
complied with 1 s rise time per I
contrasts a shaded and unshaded region. Any resistor value chosen within the unshaded
region would comply with 1 s rise time, while any value chosen in the shaded region
would not.
2
CC(A)
C-bus parts being enabled. The enable pin should only change state when the global
CC(A)
powers the 0.3V
is exceeded for the PCA9527 and turns off as the 0.7V
Table
3-channel bidirectional bus extender for HDMI, I
CC(B)
3,
CC(A)
Rev. 01 — 29 June 2009
Figure 6
powers the rest of the chip including the port B I/Os, the CEC
reference for SCLA and SDAA as well as the port A power
Figure 3
and
2
C-bus Standard-mode specification. The graph
CC(A)
Figure 7
2
CC(A)
C-bus operation because disabling during a bus
the port B driver is turned off and the rising edge
illustrates the threshold and I/O levels for port A
CC(A)
, the rise time accelerator activates and boosts
for more details.
. Then it continues to rise at the slower rate
Table
2
C-bus rise time specification when the
3. For HDMI transmitter
Figure 4
CC(B)
CC(A)
and allows the user
2
PCA9527
C-bus and SMBus
voltage is
© NXP B.V. 2009. All rights reserved.
shows the port A
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