Datasheet

PCA8574_PCA8574A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 — 3 June 2013 29 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I
2
C-bus with interrupt
Modifications: (continued) • Section 6.1 “Pinning”:
– deleted (old) Figure 3, “Pin configuration for DIP16”
– pin names changed from “AD0, AD1, AD2” to “A0, A1, A2”, respectively
• Section 6.2 “Pin description”: (old) Table 3, “Pin description for SO16, TSSOP16” and (old)
Table 4, “Pin description for SSOP20” are merged in (new) Table 3 “
Pin description”
• Section 7.1 “Device address” re-written
• Section 7.1.1 “Address maps” re-written
• Section 8.1 “Quasi-bidirectional I/Os” re-written
• Section 8.2 “Writing to the port (Output mode)” re-written
• Figure 8 “Write mode (output)”: timing measurement symbol corrected from “t
d(rst)
” to
“t
rst(INT)
”
• Section 8.3 “Reading from a port (Input mode)” re-written
• Figure 9 “Read mode (input)”:
– timing measurement symbol corrected from “t
v(D)
” to “t
v(INT)
”
– timing measurement symbol corrected from “t
d(rst)
” to “t
rst(INT)
”
• Section 8.4 “Power-on reset”: second and third sentences re-written
• Figure 9 “Read mode (input)” modified: corrected label from “data into port” to “data at port”
• Section 8.5 “Interrupt output (INT)”, fourth, fifth and sixth paragraphs re-written; added new
seventh paragraph
• Figure 10 “Application of multiple PCA8574/74As with interrupt” updated
(changed from “device 8, PCA8574” to “device 16, PCA8574A”)
• Added (new) Section 10.2 “How to read and write to I/O expander (example)”
• Section 10.3 “High current-drive load applications”:
– 1st sentence changed from “maximum sinking current of 25 mA per bit”
to “minimum guaranteed sinking current of 25 mA per bit at 4.5 V”
– 4th sentence changed from “device total limit” to “device recommended total limit”
• Figure 16 “High current-drive load application” modified: added resistor on P6 and P7 signal
lines
• Added (new) Section 10.4 “Migration path”
• Table 7 “Limiting values”: added T
j(max)
limits
• Added Section 12 “Thermal characteristics”
• Table 9 “Static characteristics”, sub-section “I/Os; P0 to P7”: added V
IL
and V
IH
characteristics
• Table 10 “Dynamic characteristics”, sub-section “Interrupt timing”:
– symbol/parameter corrected from “t
v(D)
, data input valid time”
to “t
v(INT)
, valid time on pin INT”
– symbol/parameter corrected from “t
d(rst)
, reset delay time”
to “t
rst(INT)
, reset time on pin INT”
• Figure 17 “I
2
C-bus timing diagram” updated: added 0.3  V
DD
and 0.7  V
DD
reference lines
• Deleted (old) Figure 18, “Package outline SOT38-1 (DIP16)”
• Updated soldering information
• Added Section 18 “Soldering: PCB footprints”
PCA8574_PCA8574A v.2 20070514 Product data sheet - PCA8574_PCA8574A v.1
PCA8574_PCA8574A v.1 20070117 Product data sheet - -
Table 14. Revision history …continued
Document ID Release date Data sheet status Change notice Supersedes