SCPS131E – AUGUST 2005 – REVISED MAY 2008
.........................................................................................................................................................
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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
The device outputs (latched) have high-current drive capability for directly driving LEDs.
Although pin-to-pin and I
2
C-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 I
2
C address and allow up to eight
devices to share the same I
2
C bus or SMBus. The fixed I
2
C 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
I
2
C bus or SMBus.
ORDERING INFORMATION
T
A
SSOP – DB
QSOP – DBQ
TVSOP – DGV
SOIC – DW
PACKAGE
(1) (2)
Reel of 2000
Tube of 60
Reel of 2500
Reel of 2000
Tube of 25
–40°C to 85°C
Reel of 2000
Reel of 250
Tube of 60
TSSOP – PW
Reel of 2000
Reel of 250
QFN – RGE
(1)
(2)
Reel of 3000
ORDERABLE PART NUMBER
PCA9555DBR
PCA9555DB
PCA9555DBQR
PCA9555DBQRG4
PCA9555DGVR
PCA9555DW
PCA9555DWR
PCA9555DWT
PCA9555PW
PCA9555PWE4
PCA9555PWR
PCA9555PWRE4
PCA9555PWT
PCA9555RGER
PD9555
PD9555
PCA9555
TOP-SIDE MARKING
PD9555
PCA9555
PD9555
Package drawings, thermal data, and symbolization are available at
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at
2
Product Folder Link(s):
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