PCA9507 データシートの表示（PDF） - NXP Semiconductors.
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PCA9507 Datasheet PDF : 20 Pages
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NXP Semiconductors
5. Pinning information
5.1 Pinning
PCA9507
2-wire serial bus extender for HDMI DDC I2C-bus and SMBus
VCC(A) 1
SCLA 2
SDAA 3
GND 4
8 VCC(B)
7 SCLB
PCA9507D
6 SDAB
5 EN
002aad399
Fig 2. Pin configuration for SO8
VCC(A) 1
SCLA 2
SDAA 3
GND 4
PCA9507DP
8 VCC(B)
7 SCLB
6 SDAB
5 EN
002aad400
Fig 3. Pin configuration for TSSOP8
5.2 Pin description
Table 2.
Symbol
VCC(A)
SCLA
SDAA
GND
EN
SDAB
SCLB
VCC(B)
Pin description
Pin Description
1
port A supply voltage (2.7 V to 5.5 V)
2
serial clock port A bus with rise time accelerator for DDC line or cable,
5 V tolerant
3
serial data port A bus with rise time accelerator for DDC line or cable,
5 V tolerant
4
supply ground (0 V)
5
active HIGH buffer enable input
6
serial data port B bus with static level offset, 5 V tolerant
7
serial clock port B bus with static level offset, 5 V tolerant
8
port B supply voltage (2.7 V to 5.5 V)
6. Functional description
Refer to Figure 1 “Functional diagram of PCA9507”.
The PCA9507 consists of a pair of bidirectional open-drain I/Os specifically designed to
support up-translation/down-translation between low voltages (as low as 2.7 V) and a
3.3 V or 5 V I2C-bus and SMBus. The device contains a rise time accelerator on port A
that enables the device to drive a long cable or a heavier capacitive load for DDC, I2C-bus
and SMBus applications. With dual supply rails, the device translates from voltage ranges
2.7 V to 5.5 V down to a voltage as low as 2.7 V without degradation of system
performance. All I/Os are overvoltage tolerant to 5.5 V even when the device is
un-powered (VCC(B) and/or VCC(A) = 0 V).
The PCA9507 includes a power-up circuit that keeps the output drivers turned off until
VCC(A) and VCC(B) rise above 2.7 V. VCC(A) and VCC(B) can be applied in any sequence at
power-up.
PCA9507_1
Product data sheet
Rev. 01 — 7 February 2008
© NXP B.V. 2008. All rights reserved.
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