PCA9557 Status: ACTIVE

Remote 8-Bit I2C and SMBus Low-Power I/O Expander with Reset and Configuration Registers

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Datasheet

Remote 8-Bit I2C and SMBus Low-Power I/O Expander (Rev. I) (PDF 1181 KB)
04 Jun 2008

	PCA9557
No. of Outputs	8
Reset Input	Yes
Technology Family	I2C
fSCLK(Max)(MHz)	400
VCC(Min)(V)	2.3
VCC(Max)(V)	5.5
Pin/Package	16SOIC, 16SSOP, 16QFN, 16TSSOP, 16TVSOP
Operating Temp Range(Celsius)	-40 to 85
Max Frequency(kHz)	400
I2C Address	0011 xxx
# of I/Os	8
Vcc range(V)	2.3 to 5.5
Low Power	Yes
Configuration Registers	Yes
5V Tolerant I/O	Yes
Push–Pull I/O Type	Yes
Open–Drain I/O Type	Yes
	Samples
	Inventory

Customers Who Evaluated This Product Also Evaluated

TCA6408A: Low-Voltage 8-Bit I2C and SMBus I/O Expander
PCA9555: 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
SN74AVC1T45: Single-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs
SN74CB3Q3306A: Dual FET 2.5-V/3.3-V Low-Voltage, High-Bandwidth Bus Switch
SN74LVC1G07: Single Buffer/Driver With Open-Drain Output

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Product Information

Features

Low Standby Current Consumption of 1 µA Max
I²C to Parallel Port Expander
Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
5-V Tolerant I/O Ports
400-kHz Fast I²C Bus
Three Hardware Address Pins Allow for Use of up to Eight Devices on I²C/SMBus
Lower-Voltage Higher-Performance Migration Path for PCA9556
Input/Output Configuration Register
Polarity Inversion Register
Active-Low Reset Input
Internal Power-On Reset
High-Impedance Open Drain on P0
Power Up With All Channels Configured as Inputs
No Glitch on Power Up
Noise Filter on SCL/SDA Inputs
Latched Outputs With High Current Drive Maximum 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 8-bit I/O expander for the two-line bidirectional bus (I²C) is designed for 2.3-V to 5.5-V V_CC operation. The device provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface [serial clock (SCL) and serial data (SDA)].

The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high) registers. At power on, the I/Os are configured as inputs. However, 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 device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.

The system master can reset the PCA9557 in the event of a timeout or other improper operation by asserting a low in the active-low reset (RESET) input. The power-on reset puts the registers in their default state and initializes the I²C/SMBus state machine. Asserting RESET causes the same reset/initialization to occur without depowering the part.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I²C address, allowing up to eight devices 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
PCA9557D	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE		Purchase Samples
PCA9557DB	ACTIVE	-40 to 85	1.00 \| 1ku	SSOP (DB) \| 16	View	80 \| TUBE		Purchase Samples
PCA9557DBG4	ACTIVE	-40 to 85	1.00 \| 1ku	SSOP (DB) \| 16	View	80 \| TUBE	Purchase Samples
PCA9557DBR	ACTIVE	-40 to 85	0.90 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R
PCA9557DBRG4	ACTIVE	-40 to 85	0.90 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R
PCA9557DG4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
PCA9557DGVR	ACTIVE	-40 to 85	0.90 \| 1ku	TVSOP (DGV) \| 16		2000 \| LARGE T&R
PCA9557DGVRG4G4	ACTIVE	-40 to 85	0.90 \| 1ku	TVSOP (DGV) \| 16		2000 \| LARGE T&R
PCA9557DR	ACTIVE	-40 to 85	0.90 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
PCA9557DRG4	ACTIVE	-40 to 85	0.90 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
PCA9557DT	ACTIVE	-40 to 85	0.90 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R		Purchase Samples
PCA9557DTG4	ACTIVE	-40 to 85	0.90 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
PCA9557PW	ACTIVE	-40 to 85	1.00 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
PCA9557PWG4	ACTIVE	-40 to 85	1.00 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
PCA9557PWR	ACTIVE	-40 to 85	0.90 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R
PCA9557PWRG4	ACTIVE	-40 to 85	0.90 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R
PCA9557PWT	ACTIVE	-40 to 85	0.90 \| 1ku	TSSOP (PW) \| 16	View	250 \| SMALL T&R	Purchase Samples
PCA9557PWTG4	ACTIVE	-40 to 85	0.90 \| 1ku	TSSOP (PW) \| 16	View	250 \| SMALL T&R	Purchase Samples
PCA9557RGVR	ACTIVE	-40 to 85	0.90 \| 1ku	QFN (RGV) \| 16	View	2500 \| LARGE T&R
PCA9557RGVRG4	ACTIVE	-40 to 85	0.90 \| 1ku	QFN (RGV) \| 16	View	2500 \| LARGE T&R
PCA9557RGYR	ACTIVE	-40 to 85	0.90 \| 1ku	QFN (RGY) \| 16		1000 \| LARGE T&R
PCA9557RGYRG4	ACTIVE	-40 to 85	0.90 \| 1ku	QFN (RGY) \| 16		1000 \| 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 11:37 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 11 WeeksPCA9557D
Americas	Arrow	630
Americas	Rochester Electronics	455
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	359
TI Lead Time*: 15 WeeksPCA9557DB
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCA9557DBG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCA9557DBR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 15 WeeksPCA9557DBRG4
Worldwide	DigiKey	Available
TI Lead Time*: 11 WeeksPCA9557DG4
Worldwide	DigiKey	Available
TI Lead Time*: 12 WeeksPCA9557DGVR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 12 WeeksPCA9557DGVRG4G4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCA9557DR
Americas	Arrow	>1k
Asia	WPI	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 15 WeeksPCA9557DRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCA9557DT
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCA9557DTG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCA9557PW
Americas	Arrow	308
Americas	Rochester Electronics	695
Europe	Avnet-SILICA	360
TI Lead Time*: 20 WeeksPCA9557PWG4
None Reported View Distributors
TI Lead Time*: 19 WeeksPCA9557PWR
Worldwide	Mouser Electronics	775
TI Lead Time*: 19 WeeksPCA9557PWRG4
None Reported View Distributors
TI Lead Time*: 19 WeeksPCA9557PWT
Americas	Arrow	1k
Asia	WPI	85
TI Lead Time*: 19 WeeksPCA9557PWTG4
None Reported View Distributors
TI Lead Time*: 17 WeeksPCA9557RGVR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	885
TI Lead Time*: 17 WeeksPCA9557RGVRG4
Worldwide	DigiKey	Available
TI Lead Time*: 14 WeeksPCA9557RGYR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	DigiKey	660
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 14 WeeksPCA9557RGYRG4
Worldwide	DigiKey	Available
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
PCA9557D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DB	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DBG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DGVRG4G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557DTG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PWT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557PWTG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCA9557RGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9557RGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9557RGYR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCA9557RGYRG4	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 PCA9557

Datasheet

Remote 8-Bit I2C and SMBus Low-Power I/O Expander (Rev. I) (PDF, 1181 KB)
04 Jun 2008

Application Notes

Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 26969 views
24 May 2004 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 21380 views
28 May 2003 Read Abstract
Programming Fun Lights With TI's TCA6507 (HTM, 8 KB) 3462 views
30 Nov 2007 Read Abstract

Selection Guides

Logic Guide 2009 (Rev. Z) (PDF, 4263 KB) 88618 views
23 Jul 2009
I2C Guide (Rev. B) (PDF, 2830 KB) 12900 views
12 Aug 2009

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PCA9557 Status: ACTIVE

Remote 8-Bit I2C and SMBus Low-Power I/O Expander with Reset and Configuration Registers

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