ST485ABDR ,VERY HIGH SPEED LOW POWER RS-485/RS422 TRANSCEIVERAPPLICATIONS■ -7 TO 12 COMMON MODE INPUT VOLTAGERANGE■ DRIVER MANTAINS HIGH IMPEDANCE IN3-STATE ORW ..
ST485ABN ,VERY HIGH SPEED LOW POWER RS-485/RS422 TRANSCEIVERPIN CONFIGURATIONPIN DESCRIPTIONPlN N° SYMBOL NAME AND FUNCTIONReceiver Output. If A>B by 200mV, RO ..
ST485B ,LOW POWER RS-485/RS-422 TRANSCEIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage7VCCV Control Input Voltage (RE, ..
ST485B ,LOW POWER RS-485/RS-422 TRANSCEIVERPIN CONFIGURATIONPIN DESCRIPTIONPlN N° SYMBOL NAME AND FUNCTION1 RO Receiver Output2RE Receiver Out ..
ST485BD ,LOW POWER RS-485/RS-422 TRANSCEIVERPIN CONFIGURATIONPIN DESCRIPTIONPlN N° SYMBOL NAME AND FUNCTION1 RO Receiver Output2RE Receiver Out ..
ST485BDR ,LOW POWER RS-485/RS-422 TRANSCEIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage12 VCCV Control Input Voltage (R ..
STM8S207MBT6B ,Mainstream Performance line 8-bit MCU with 128 Kbytes Flash, 24 MHz CPU, integrated EEPROMfeatures 19Table 5. Legend/abbreviations for pinout table . 28Table 6. Pin description ..
STM8S207R6T6 ,Mainstream Performance line 8-bit MCU with 32 Kbytes Flash, 24 MHz CPU, integrated EEPROMThermal characteristics . . . . . . 9511.2.1 Reference document . . . . . . . 9511.2.2 Se ..
STM8S207R6T6 ,Mainstream Performance line 8-bit MCU with 32 Kbytes Flash, 24 MHz CPU, integrated EEPROMFeatures■ Core–Max f : up to 24 MHz, 0 wait states @ CPUf ≤ 16 MHzCPU LQFP80 14x14 LQFP64 14x14 LQ ..
STM8S207R8T3 ,Mainstream Performance line 8-bit MCU with 64 Kbytes Flash, 24 MHz CPU, integrated EEPROMfeatures 19Table 5. Legend/abbreviations for pinout table . 28Table 6. Pin description ..
STM8S207R8T6 ,Mainstream Performance line 8-bit MCU with 64 Kbytes Flash, 24 MHz CPU, integrated EEPROMfeatures 19Table 5. Legend/abbreviations for pinout table . 28Table 6. Pin description ..
STM8S207R8T6C ,Mainstream Performance line 8-bit MCU with 64 Kbytes Flash, 24 MHz CPU, integrated EEPROMElectrical characteristics . . . . 5110.1 Parameter conditions 5110.1.1 Minimum and maxim ..
ST485ABD-ST485ABDR-ST485ABN
VERY HIGH SPEED LOW POWER RS-485/RS422 TRANSCEIVER
1/13November 2002 LOW SUPPLY CURRENT: 5mA MAX HIGH DATA RATE> 30Mbps DESIGNED FOR RS 485 INTERFACE
APPLICATIONS -7 TO12 COMMON MODE INPUT VOLTAGE
RANGE DRIVER MANTAINS HIGH IMPEDANCEIN
3-STATE ORWITHTHE POWER OFF 70mV TYPICAL INPUT HYSTERESIS OPERATE FROM SINGLE5 SUPPLY ±4kV ESD PROTECTION CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION LATCH-UP FREE UP TO 500mA
DESCRIPTIONThe ST485A isa low power, high speed
transceiver for RS-485 and RS-422
communications. The device contains one driver
and one receiverin half duplex configuration. The
ST485A draws 3mA (typ.)of supply current when
unloadedor fully loaded with disabled drivers.It
operates froma single 5V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipationby
thermal shutdown circuitry that place the driver
outputs intoa high-impedance state. The receiver
input hasa fail-safe feature that guaranteesa
logic high outputif both inputs are open circuit.
The ST485Ais designed for bi-directional data
communications or multipoint bus transmission
lines.
ORDERING CODES
ST485AVERY HIGH SPEED
LOW POWER RS-485/RS-422 TRANSCEIVER
ST485A2/13
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER) Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER) Don’t Care; Z=High Impedance
ST485A3/13
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
ELECTRICAL CHARACTERISTICSCC =4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTA= 25°C,
VCC= 5V) (See Note1)
LOGIC INPUT ELECTRICAL CHARACTERISTICSCC =4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTA= 25°C,
VCC =5V) (See Note1
ST485A4/13
TRANSMITTER ELECTRICAL CHARACTERISTICSVCC= 4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa= 25°C,CC= 5V) (See Note1)
RECEIVER ELECTRICAL CHARACTERISTICSVCC= 4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa= 25°C,CC= 5V) (See Note1)
ST485A5/13
DRIVER SWITCHING CHARACTERISTICSVCC= 4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa= 25°C,CC= 5V) (See Note1,3)
RECEIVER SWITCHING CHARACTERISTICSVCC= 4.5Vto 5.5V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa= 25°C,
VCC= 5V) (See Note1,3)
Note1:All currentsinto device pinsare positive;all cuttentsoutof device pinsare negative;all voltagesare referencedto device ground
unless specified.
Note2: Appliesto peak current. See typical Operating Characteristics.
Note3: tr=tf ≤ 6ms
ST485A6/13
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure1: Driver DC Test Load
Figure2: Receiver Timing Test Load
Figure3: Drive/Receiver Timing Test Circuit
ST485A7/13
Figure4: Driver Timing Test Load
Figure5: Driver Propagation Delay
