PCA9555 Status: ACTIVE

Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers

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Datasheet

Remote 16-Bit I2C and SMBus I/O Expander (Rev. E) (PDF 871 KB)
07 May 2008

	PCA9555
No. of Outputs	2
Interrupt Output	Yes
fSCLK(Max)(MHz)	400
VCC(Min)(V)	2.3
VCC(Max)(V)	5.5
Pin/Package	24SOIC, 24TSSOP, 24SSOP, 24SSOP/QSOP, 24TVSOP, 24VQFN
Operating Temp Range(Celsius)	-40 to 85
Max Frequency(kHz)	400
I2C Address	0100 xxx
# of I/Os	16
Vcc range(V)	2.3 to 5.5
Configuration Registers	Yes
5V Tolerant I/O	Yes
Push–Pull I/O Type	Yes
	Samples
	Inventory

Customers Who Evaluated This Product Also Evaluated

PCA9535: Remote 16-Bit I2C and SMBus, Low-Power I/O Expander With Interrupt Output and Config Registers
TCA9555: Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers
PCF8574: Remote 8-Bit I/O Expander for I2C-Bus
TCA8418: I2C Controlled Keypad Scan IC
TPS40210: Wide Input Range Current Mode Boost Controller
MAX3243E: 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15kV IEC ESD Protection

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Product Information

Features

Low Standby-Current Consumption of1 µA Max
I²C to Parallel Port Expander
Open-Drain Active-Low Interrupt Output
5-V Tolerant I/O Ports
Compatible With Most Microcontrollers
400-kHz Fast I²C Bus
Address by Three Hardware Address Pins for Use of up to Eight Devices
Polarity Inversion Register
Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

DESCRIPTION/ORDERING INFORMATION

This 16-bit I/O expander for the two-line bidirectional bus (I²C) is designed for 2.3-V to 5.5-V V_CC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface [serial clock (SCL), serial data (SDA)].

The PCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low operation) registers. At power on, the I/Os are configured as inputs. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.

The system master can reset the PCA9555 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I²C/SMBus state machine.

The PCA9555 open-drain interrupt (INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C bus. Thus, the PCA9555 can remain a simple slave device.

The device outputs (latched) have high-current drive capability for directly driving LEDs.

Although pin-to-pin and I²C-address is compatible with the PCF8575, software changes are required due to the enhancements.

The PCA9555 is identical to the PCA9535, except for the inclusion of the internal I/O pullup resistor, which pulls the I/O to a default high when configured as an input and undriven.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I²C address and allow up to eight devices to share the same I²C bus or SMBus. The fixed I²C address of the PCA9555 is the same as the PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I²C bus or SMBus.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
PCA9555DB	ACTIVE	-40 to 85	1.30 \| 1ku	SSOP (DB) \| 24	View	60 \| TUBE		Purchase Samples
PCA9555DBG4	ACTIVE	-40 to 85	1.30 \| 1ku	SSOP (DB) \| 24	View	60 \| TUBE	Purchase Samples
PCA9555DBQR	ACTIVE	-40 to 85	1.20 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R
PCA9555DBQRG4	ACTIVE	-40 to 85	1.20 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R
PCA9555DBR	ACTIVE	-40 to 85	1.20 \| 1ku	SSOP (DB) \| 24	View	2000 \| LARGE T&R
PCA9555DBRG4	ACTIVE	-40 to 85	1.20 \| 1ku	SSOP (DB) \| 24	View	2000 \| LARGE T&R
PCA9555DGVR	ACTIVE	-40 to 85	1.20 \| 1ku	TVSOP (DGV) \| 24		2000 \| LARGE T&R
PCA9555DGVRG4	ACTIVE	-40 to 85	1.20 \| 1ku	TVSOP (DGV) \| 24		2000 \| LARGE T&R
PCA9555DW	ACTIVE	-40 to 85	1.30 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE		Purchase Samples
PCA9555DWG4	ACTIVE	-40 to 85	1.30 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE	Purchase Samples
PCA9555DWR	ACTIVE	-40 to 85	1.20 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R
PCA9555DWRG4	ACTIVE	-40 to 85	1.20 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R
PCA9555PW	ACTIVE	-40 to 85	1.30 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE	Purchase Samples
PCA9555PWE4	ACTIVE	-40 to 85	1.30 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE		Purchase Samples
PCA9555PWG4	ACTIVE	-40 to 85	1.30 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE	Purchase Samples
PCA9555PWR	ACTIVE	-40 to 85	1.20 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCA9555PWRE4	ACTIVE	-40 to 85	1.20 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCA9555PWRG4	ACTIVE	-40 to 85	1.20 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCA9555RGER	ACTIVE	-40 to 85	1.20 \| 1ku	VQFN (RGE) \| 24	View	3000 \| LARGE T&R
PCA9555RGERG4	ACTIVE	-40 to 85	1.20 \| 1ku	VQFN (RGE) \| 24	View	3000 \| LARGE T&R

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 11:12 AM GMT, 09 Feb 2010
Region	Company	In Stock	Purchase
TI Lead Time*: 15 WeeksPCA9555DB
Americas	Arrow	418
	Newark	141
	Rochester Electronics	>1k
Asia	WPI	89
Europe	Avnet-SILICA	>1k
Worldwide	Mouser Electronics	49
TI Lead Time*: 15 WeeksPCA9555DBG4
None Reported View Distributors
TI Lead Time*: 20 WeeksPCA9555DBQR
Americas	Arrow	>1k
Worldwide	DigiKey	35
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 20 WeeksPCA9555DBQRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCA9555DBR
Americas	Arrow	>1k
	Newark	>1k
	Rochester Electronics	>1k
Asia	Farnell Asia	>1k
Europe	Avnet-SILICA	>1k
Worldwide	Mouser Electronics	645
TI Lead Time*: 20 WeeksPCA9555DBRG4
None Reported View Distributors
TI Lead Time*: 20 WeeksPCA9555DGVR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 20 WeeksPCA9555DGVRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCA9555DW
Americas	Arrow	461
	Avnet	551
	Newark	138
	Rochester Electronics	340
Asia	WPI	10
Europe	Avnet-SILICA	400
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	99
TI Lead Time*: 20 WeeksPCA9555DWG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCA9555DWR
Americas	Arrow	>1k
	Newark	>1k
	Rochester Electronics	>1k
Asia	Farnell Asia	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	18
TI Lead Time*: 20 WeeksPCA9555DWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksPCA9555PW
Americas	Arrow	>1k
Americas	Newark	240
Europe	Arrow Southern Europe	120
Europe	Avnet-SILICA	830
Worldwide	Mouser Electronics	600
TI Lead Time*: 22 WeeksPCA9555PWE4
Americas	Avnet	>1k
Americas	Rochester Electronics	660
Worldwide	Mouser Electronics	31
TI Lead Time*: 22 WeeksPCA9555PWG4
None Reported View Distributors
TI Lead Time*: 22 WeeksPCA9555PWR
Worldwide	Mouser Electronics	1
TI Lead Time*: 22 WeeksPCA9555PWRE4
None Reported View Distributors
TI Lead Time*: 22 WeeksPCA9555PWRG4
None Reported View Distributors
TI Lead Time*: 20 WeeksPCA9555RGER
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	Mouser Electronics	294
TI Lead Time*: 20 WeeksPCA9555RGERG4
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
PCA9555DB	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DBG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DBQR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9555DBQRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9555DBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555DWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9555RGER	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9555RGERG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for PCA9555

Datasheet

Remote 16-Bit I2C and SMBus I/O Expander (Rev. E) (PDF, 871 KB)
07 May 2008

Application Notes

Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 28292 views
24 May 2004 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 23173 views
28 May 2003 Read Abstract
Programming Fun Lights With TI's TCA6507 (HTM, 8 KB) 4038 views
30 Nov 2007 Read Abstract

Selection Guides

Logic Guide 2009 (Rev. Z) (PDF, 4263 KB) 98861 views
23 Jul 2009
I2C Guide (Rev. B) (PDF, 2830 KB) 15097 views
12 Aug 2009

Part #	Name	Product Family	Comments
TCA9555	Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers	I2C (SL) - I2C IO EXPANDERS	The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent. It is an enhanced version of the PCA9555 with an extended supply voltage range and performance enhancements related to Power-On Reset and Interrupt.
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All End-Equipment

PCA9555 Status: ACTIVE

Remote 16-Bit I2C And SMBus I/O Expander With Interrupt Output And Configuration Registers

See Also

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Datasheet

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