RS485 Ver la hoja de datos (PDF) - Linear Technology
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RS485 Datasheet PDF : 20 Pages
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LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
Supply Currents
ICC
VCC Supply Current
No Load (SEL1 = SEL2 = HIGH)
Shutdown, ON/OFF = 0V
IDD
VDD Supply Current (LTC1321/LTC1322)
No Load (SEL1 = SEL2 = LOW)
Shutdown, ON/OFF = 0V
IEE
VEE Supply Current
No Load (SEL1 = SEL2 = HIGH)
Shutdown, ON/OFF = 0V
MIN TYP MAX UNITS
q
1000 2000
µA
q
15
50
µA
q
300 1000
µA
q
0.1
50
µA
q
– 1000 – 2000
µA
q
– 0.1 – 50
µA
ADCC ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
EIA/TIA-562 Mode (SEL1 = SEL2 = LOW)
SR
Slew Rate
tT
Transition Time
t PLH
Driver Input to Output
t PHL
Driver Input to Output
t PLH
Receiver Input to Output
t PHL
Receiver Input to Output
RS485 Mode (SEL1 = SEL2 = HIGH)
Figure 4, RL = 3k, CL = 15pF
Figure 4, RL = 3k, CL = 1000pF
Figure 4, RL = 3k, CL = 2500pF
Figures 4,10, RL = 3k, CL = 15pF
Figures 4,10, RL = 3k, CL = 15pF
Figures 5,11
Figures 5,11
t PLH
Driver Input to Output
t PHL
Driver Input to Output
tSKEW
Driver Output to Output
tr, tf
Driver Rise or Fall Time
t ZL
Driver Enable to Output Low
t ZH
Driver Enable to Output High
tLZ
Driver Disable from Low
tHZ
Driver Disable from High
t PLH
Receiver Input to Output
t PHL
Receiver Input to Output
tSKEW
Differential Receiver Skew, tPLH-tPHL
Receiver Output Enable/Disable (LTC1335)
Figures 2,7, RL = 54Ω, CL = 100pF
Figures 2,7, RL = 54Ω, CL = 100pF
Figures 2,7, RL = 54Ω, CL = 100pF
Figures 2,7, RL = 54Ω, CL = 100pF
Figures 3,8, CL = 100pF, S1 Closed
Figures 3,8, CL = 100pF, S2 Closed
Figures 3,8, CL = 15pF, S1 Closed
Figures 3,8, CL = 15pF, S2 Closed
Figures 2,9, RL = 54Ω, CL = 100pF
Figures 2,9, RL = 54Ω, CL = 100pF
Figures 2,9, RL = 54Ω, CL = 100pF
tZL
Receiver Enable to Output Low
tZH
Receiver Enable to Output High
Figures 6,12, CL = 15pF, S1 Closed
Figures 6,12, CL = 15pF, S2 Closed
tLZ
Receiver Disable from Low
Figures 6,12, CL = 15pF, S1 Closed
tHZ
Receiver Disable from High
Figures 6,12, CL = 15pF, S2 Closed
MIN TYP MAX UNITS
q
q4
14
30
V/µs
7
V/µs
q 0.22
1.9
3.1
µs
q
0.6
4
µs
q
0.6
4
µs
q
0.3
6
µs
q
0.4
6
µs
q 20
40
70
ns
q 20
40
70
ns
q
5
15
ns
q3
15
40
ns
q
50
90
ns
q
50
90
ns
q
50
90
ns
q
60
90
ns
q 20
60
140
ns
q 20
70
140
ns
q
10
ns
q
40
90
ns
q
40
90
ns
q
40
90
ns
q
50
90
ns
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those values beyond which the
safety of the device cannot be guaranteed.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: All typicals are given at VCC = VDD (LTC1321/LTC1322) = 5V,
VEE = – 5V, and TA = 25°C.
Note 4: Short-circuit current for RS485 driver output low state folds back
above VCC. Peak current occurs around VO = 3V.
4
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