SN65HVS881_16 Datasheet, PDF (15/22 Pages) Texas Instruments – INDUSTRIAL 8-DIGITAL-INPUT SERIALIZER WITH DIAGNOSTICS

SN65HVS881
www.ti.com................................................................................................................................................................................................... SLAS642 – MARCH 2009
CLK
CE
SIP
high
LD
PAR - PIP 6
PIP 7
SOP ^{don’t care}
IP 7
IP6 IP5 IP4 IP3 IP2 IP1 IP0 HOT UVO PAR SIP
inhibit
Serial shift
Figure 21. Interface Timing for Parallel-Load and Serial-Shift Operation of the Shift Register
Cascading for High Channel Count Input Modules
Designing high-channel count modules requires cascading multiple SN65HVS881 devices. Simply connect the
serial output (SOP) of a leading device with the serial input (SIP) of a following device without changing the
processor interface.
4 x SN65HVS881
ISO7241
OUTA
INA
OUTB
INB
OUTC
INC
IND
OUTD
HOST
CONTROLLER
LOAD
STE
SCLK
SOMI
SERIALIZER
SERIALIZER
SERIALIZER
SERIALIZER
Figure 22. Cascading Four SN65HVS881 for a 32-Channel Input Module
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): SN65HVS881
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