Information

134 | Signal Chain Guide 2013 Texas Instruments
Interface
SerDes – Industrial
Get more information: www.ti.com/product/SN65HVS885
Eight-Channel, 0-34 V Digital-Input Serializer with 5 V V
cc
for Industrial Digital Inputs
SN65HVS885
The SN65HVS885 is an eight-channel, digital-input serializer for high-channel density
digital input modules in industrial and building automation. Operating from a 5 V supply,
the device accepts field input voltages of up to 34 V. In combination with galvanic isola-
tors, the device completes the interface between the high voltage signals on the field
side and the low-voltage signals on the contr
oller side. Input signals are current limited
and then validated by internal debounce filters.
With the addition of few external components, the input switching characteristic can be
configured in accordance with IEC61131-2 for Type 1, 2 and 3 sensor switches.
Upon the application of load and clock signals, input data is latched in parallel into the
shift register and afterwards clocked out serially.
SN65HVS885 functional block diagram
Key Features
• Eightdigitalsensorinputs
• High-inputvoltageupto34V
• Selectabledebouncefilters
from 0 ms to 3 ms
•
Flexiblecurrent-limitedinputs 
–0.2 mA to 5.2 mA
• Fieldinputsprotectedto15kVESD
• Single5Vsupply
• Outputdriversforexternal 
status LEDs
• Cascadableformoreinputsin 
multiples of eight
• SPI-compatibleinterface
• Overtemperatureindicator
Applications
• IndustrialPCs
• DigitalI/Ocards
• High-channel-countdigital 
input modules
• DecentralizedI/Omodules
Serializer
&
Channel0
Channel 7
Vcc
GND
RLIM
RE0
IP0
RE7
IP7
HOT
SIP
SOP
CLK
LD
CE
DB0
DB1
Debounce
Filter
Current
Sense
Voltage
Sense
Adj.Current
Thresholds
Debounce
Select
Thermal
Protection
Industrial Serializers
Device Description
Supply
Voltage (V)
I/O
Voltage
(V) Parity
Input Data
Rate (Mbps)
Temperature
Range
Low Voltage
Detector
HiRel
Avail. Package Price*
Industrial Eight-Channel Digital Serializers
SN65HVS880 Nominal 24 V Digital-Input Serializer 18 to 30 0 to 30 No 1 –40 to 85 Yes: 15 V N HTSSOP-28 1.90
SN65HVS881 0-34 V Digital-Input Serializer with
Parity
10 to 34 0 to 34 Yes 1 –40 to 125 Yes: 15 V N HTSSOP-28 2.00
SN65HVS882 0-34 V Digital-Input Serializer 10 to 34 0 to 34 No 1 –40 to 125 No N HTSSOP-28 2.00
SN65HVS885 0-34 V Digital-Input Serializer for
5 V Systems
4.5 to 5.5 0 to 34 No 1 –40 to 125 No N HTSSOP-28 1.80
*Suggested resale price in U.S. dollars in quantities of 1,000. See www.ti.com/hirel for HiRel options.