Datasheet

PCF8574_PCF8574A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 5 — 27 May 2013 3 of 33
NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I
2
C-bus with interrupt
5. Block diagram
PCF8574TS/3 PCF8574TS/3,112 SSOP20 Standard marking
* IC’s tube - DSC bulk pack
1350 T
amb
= 40 C to +85 C
PCF8574TS/3,118 SSOP20 Reel 13” Q1/T1
*standard mark SMD
2500 T
amb
= 40 C to +85 C
PCF8574ATS/3 PCF8574ATS/3,118 SSOP20 Reel 13” Q1/T1
*standard mark SMD
2500 T
amb
= 40 C to +85 C
Table 2. Ordering options …continued
Type number Orderable
part number
Package Packing method Minimum
order
quantity
Temperature range
Fig 1. Block diagram
Fig 2. Simplified schematic diagram of P0 to P7
002aad624
INT
I
2
C-BUS
CONTROL
LP FILTER
PCF8574
PCF8574A
INTERRUPT
LOGIC
A0
A1
A2
INPUT
FILTER
SHIFT
REGISTER
SDA
SCL
8 bits
write pulse
read pulse
POWER-ON
RESET
V
DD
V
SS
I/O
PORT
P0
P1
P2
P3
P4
P5
P6
P7
002aac109
write pulse
read pulse
D
CI
S
FF
Q
power-on reset
data from Shift Register
I
trt(pu)
100 μA
I
OH
I
OL
V
DD
P0 to P7
V
SS
D
CI
S
FF
Q
data to Shift Register
to interrupt logic