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PCA9509
Datasheet
General description
The PCA9509 is a level translating I2C-bus/SMBus repeater that enables processor low voltage 2-wire serial bus to interface with standard I2C-bus or SMBus I/O. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling the I2C-bus or SMBus maximum capacitance of 400 pF on the higher voltage side. The SDA and SCL pins are over-voltage tolerant and are high-impedance when the PCA9509 is unpowered.
The bus port B drivers are compliant with SMBus I/O levels, while port A uses a current sensing mechanism to detect the input or output LOW signal which prevents bus lock-up. Port A uses a 1 mA current source for pull-up and a 200 Ohm pull-down driver. This results in a LOW on the port A accommodating smaller voltage swings. The output pull-down on the port A internal buffer LOW is set for approximately 0.2 V, while the input threshold of the internal buffer is set about 50 mV lower than that of the output voltage LOW. When the port A I/O is driven LOW internally, the LOW is not recognized as a LOW by the input. This prevents a lock-up condition from occurring. The output pull-down on the port B drives a hard LOW and the input level is set at 0.3 of SMBus or I2C-bus voltage level which enables port B to connect to any other I2C-bus devices or buffer.
The PCA9509 drivers are not enabled unless VCC(A) is above 0.8 V and VCC(B) is above 2.5 V. The enable (EN) pin can also be used to turn the drivers on and off under system control. Caution should be observed to only change the state of the EN pin when the bus is idle.
Features
- Bidirectional buffer isolates capacitance and allows 400 pF on port B of the device
- Voltage level translation from port A (1 V to VCC(B) - 1.0 V) to port B (3.0 V to 5.5 V)
- Requires no external pull-up resistors on lower voltage port A
- Active HIGH repeater enable input
- Open-drain inputs/outputs
- Lock-up free operation
- Supports arbitration and clock stretching across the repeater
- Accommodates Standard-mode and Fast-mode I2C-bus devices and multiple masters
- Powered-off high-impedance I2C-bus pins
- Operating supply voltage range of 1.0 V to VCC(B) - 1.0 V on port A, 3.0 V to 5.5 V on port B
- 5 V tolerant port B SCL, SDA and enable pins
- 0 Hz to 400 kHz clock frequency
Remark: The maximum system operating frequency may be less than 400 kHz because of the delays added by the repeater. - ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
- Packages offered: TSSOP8, SO8, XQFN8
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9509D | PCA9509D | 9352 822 27112 | Volume production | SOT96-1
(SO8) | Tube | Standard Marking | Not available
| Always Pb-free |
| PCA9509D | PCA9509D-T | 9352 822 27118 | Volume production | SOT96-1
(SO8) | Tape reel smd | Standard Marking | Not available
| Always Pb-free |
| PCA9509DP | PCA9509DP-T | 9352 822 26118 | Volume production | SOT505-1
(TSSOP8) | Reel Pack, SMD, 13" | Standard Marking | Not available
| Always Pb-free |
| PCA9509GM | PCA9509GM-G | 9352 841 39125 | Volume production | SOT902-1
(XQFN8U) | Reel Pack, Reverse, Reverse | Standard Marking | PCA9509GM
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA9509D | 9352 822 27112 | Order samples | ||||||
| PCA9509D | 9352 822 27118 | not available | ||||||
| PCA9509DP | 9352 822 26118 | NA | DIGI-KEY CORPORATION | 2,500 | 6/29/2008 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 1,894 | 6/29/2008 | Buy online | ||||
| PCA9509GM | 9352 841 39125 | NA | DIGI-KEY CORPORATION | 4,000 | 6/29/2008 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 3,780 | 6/29/2008 | Buy online |
Applications
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Technical documents
Application Notes
Support Documents
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
Parametrics/similar products
| Type number | Package | Enable | Operating temp.(Cel) | I²C-bus(kHz) | Operating voltage(VDC) | Operating Voltage Range 2(V) | Inputs | Outputs |
|---|---|---|---|---|---|---|---|---|
| PCA9509D | SOT96-1
(SO8) | yes | -40~85 | 400 | 2.7~3.6 | 0.9~5.5 | 1 | 1 |
| PCA9509DP | SOT505-1
(TSSOP8) | yes | -40~85 | 400 | 2.7~3.6 | 0.9~5.5 | 1 | 1 |
Similar products
PCA9509 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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