LTC485I(RevE) Просмотр технического описания (PDF) - Linear Technology
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LTC485I Datasheet PDF : 12 Pages
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LTC485
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage ....................................................... 12V
Control Input Voltages ................... – 0.5V to VCC + 0.5V
Driver Input Voltage ....................... – 0.5V to VCC + 0.5V
Driver Output Voltage ........................................... ±14V
Receiver Input Voltage.......................................... ±14V
Receiver Output Voltages .............. – 0.5V to VCC + 0.5V
Operating Temperature Range
LTC485I...................................... – 40°C ≤ TA ≤ 85°C
LTC485C.......................................... 0°C ≤ TA ≤ 70°C
LTC485M.................................. – 55°C ≤ TA ≤ 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RO 1
RE 2
R
8 VCC
7B
DE 3
DI 4
D
6A
5 GND
J8 PACKAGE
N8 PACKAGE
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
TJMAX = 155°C, θJA = 100°C/ W (J)
TJMAX = 100°C, θJA = 130°C/ W (N)
TJMAX = 100°C, θJA = 170°C/ W (S)
ORDER PART
NUMBER
LTC485CJ8
LTC485CN8
LTC485CS8
LTC485IN8
LTC485IS8
LTC485MJ8
S8 PART MARKING
485
485I
ELECTRICAL CHARACTERISTICS VCC = 5V ±5%, unless otherwise noted. (Notes 2 and 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
VOD1
Differential Driver Output Voltage (Unloaded) IO = 0
VOD2
Differential Driver Output Voltage (with Load) R = 50Ω (RS422)
R = 27Ω (RS485), Figure 1
q
q2
q 1.5
∆VOD
Change in Magnitude of Driver
DifferentialOutput Voltage for
Complementary States
R = 27Ω or R = 50Ω, Figure 1
q
VOC
Driver Common-Mode Output Voltage
R = 27Ω or R = 50Ω, Figure 1
q
∆VOC
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary States
R = 27Ω or R = 50Ω, Figure 1
q
VIH
Input High Voltage
VIL
Input Low Voltage
IIN1
Input Current
IIN2
Input Current (A, B)
VTH
Differential Input Threshold Voltage
for Receiver
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0, VCC = 0V VIN = 12V
or 5.25V
VIN = – 7V
– 7V ≤ VCM ≤ 12V
q2
q
q
q
q
q – 0.2
∆VTH
Receiver Input Hysteresis
VOH
Receiver Output High Voltage
VOL
Receiver Outpu Low Voltage
IOZR
Three-State (High Impedance) Output
Current at Receiver
VCM = 0V
IO = – 4mA, VID = 200mV
IO = 4mA, VID = – 200mV
VCC = Max, 0.4V ≤ VO ≤ 2.4V
q
70
q 3.5
q
q
RIN
Receiver Input Resistance
ICC
Supply Current
– 7V ≤ VCM ≤ 12V
q 12
No Load, Pins 2, Outputs Enabled
q
500
3, 4 = 0V or 5V Outputs Disabled
q
300
IOSD1
IOSD2
IOSR
Driver Short-Circuit Current, VOUT = HIGH
Driver Short-Circuit Current, VOUT = LOW
Receiver Short-Circuit Current
VO = – 7V
VO = 10V
0V ≤ VO ≤ VCC
q 35
100
q 35
100
q7
MAX UNITS
5
V
V
5
V
0.2
V
3
V
0.2
V
V
0.8
V
±2
µA
±1
mA
– 0.8
mA
0.2
V
mV
V
0.4
V
±1
µA
kΩ
900
µA
500
µA
250
mA
250
mA
85
mA
2
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