SP4082E Datasheet, PDF (4/14 Pages) Exar Corporation – 5V RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected

PARAMETER
Digital Input Signals: DI, DE, RE
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
High, Vih
2.0
Logic input thresholds
Low, Vil
Logic Input Current
Ta = 25°C, after first transition
Input Hysteresis
Ta = 25°C
Driver
Differential Driver Output (Vod)
No Load
Rl=100Ω (RS-422)
2
Differential Driver Output, Test 1
Rl=54Ω (RS-485)
1.5
Differential Driver Output, Test 2
Vcm = -7 to +12V
1.5
Change in Magnitude of Differential Output
Voltage (ΔVod) (Note 1)
Rl=54 or 100Ω
Driver Common Mode Output Voltage (Voc) Rl=54 or 100Ω
1
V
0.8
±1
μA
100
mV
Vcc
V
Vcc
2.7
Vcc
V
Vcc
±0.2
V
3
V
Change in Common Mode Output Voltage
(ΔVoc)
Rl=54 or 100Ω
±0.2
V
Driver Short Circuit Current Limit
Output Leakage Current
Receiver
Receiver Input Resistance
Input Current (A, B pins)
Receiver Differential Threshold (VA-VB)
Receiver Input Hysteresis
Receiver _Voh
Output
Voltage Vol
High-Z Receiver Output Current
-7V ≤ Vout ≤ +12V
DE=0,
Vout=12V
RE=0,
Vcc=0 or
5.5V
Vout= -7V
-7V ≤ Vcm ≤ 12V
DE=0,
RE=0,
Vcc=0 or
5.5V
Vin= 12V
Vin= -7V
-7V ≤ Vcm ≤ 12V
Iout = -8mA, Vid = -40mV
Iout = 8mA, Vid = -200mV
Vcc =5.5V, 0 ≤ Vout ≤ Vcc
-100
±250
mA
125
μA
96
KΩ
125
-100
μA
-200
-125
-40
mV
25
mV
Vcc-1.5
V
0.4
±1
μA
Receiver Output Short Circuit Current
Supply and Protection
Supply
Current
IQ, Active Mode
Shutdown Mode, Note 2
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
0V ≤ Vro ≤ Vcc
No load, DI=0 or Vcc
DE=0, RE=Vcc, DI=Vcc
Junction temperature
± 95
mA
400
900
μA
1
μA
165
o_C
15
Notes:
1. Change in Magnitude of Differential Output Voltage and Change in Magnitude of Common Mode Output Voltage are the changes in output voltage when DI input changes state.
2. The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns the device does not enter shutdown. If the enable inputs
are held in this state for at least 600ns the device is assured to be in shutdown. In this low power mode most circuitry is disabled and supply current is typically 1nA.
3.Characterized, not 100% tested.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)6687000 • Fax [phone] • www.exar.com

SP4082E_100_122007