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