LTC1487 Ver la hoja de datos (PDF) - Linear Technology
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LTC1487 Datasheet PDF : 8 Pages
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LTC1487
ELECTRICAL CHARACTERISTICS –40°C ≤ TA ≤ 85°C, VCC = 5V (Note 4) unless otherwise noted.
SYMBOL
VOD1
VOD2
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (with Load)
VOC
Driver Common-Mode Output Voltage
VTH
Differential Input Threshold Voltage for Receiver
∆VTH
Receiver Input Hysteresis
ICC
Supply Current
ISHDN
tPLH
tPHL
tSKEW
tr, tf
tPLH
tPHL
tSKD
fMAX
Supply Current in Shutdown Mode
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Receiver Input to Output
Receiver Input to Output
tPLH – tPHL Differential Receiver Skew
Maximum Data Rate
CONDITIONS
IO = 0
R = 50Ω (RS422)
R = 27Ω (RS485), Figure 1
R = 27Ω or R = 50Ω, Figure 1
– 7V ≤ VCM ≤ 12V
VCM = 0V
No Load, Output Enabled
No Load, Output Disabled
DE = 0V, RE = VCC
RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3, 5)
RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3, 7)
MIN
q
q 2.0
q 1.5
q
q – 0.2
q
q
q
q 150
q 150
q
q 150
q 30
q 30
q
q 250
TYP
MAX
5
5
3
0.2
45
120
200
80
120
1
10
1200
1200
100
600
2000
140
250
140
250
13
U
SWITCHI G CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCC = 5V (Notes 2, 3) unless otherwise noted.
SYMBOL
tPLH
tPHL
tSKEW
tr, tf
tZH
tZL
tLZ
tHZ
tPLH
tPHL
tSKD
tZL
tZH
tLZ
tHZ
fMAX
tSHDN
PARAMETER
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
Receiver Input to Output
tPLH – tPHL Differential Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
Maximum Data Rate
Time to Shutdown
CONDITIONS
RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3, 5)
CL = 100pF (Figures 4, 6), S2 Closed
CL = 100pF (Figures 4, 6), S1 Closed
CL = 15pF (Figures 4, 6), S1 Closed
CL = 15pF (Figures 4, 6), S2 Closed
RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3, 7)
CRL = 15pF (Figures 2, 8), S1 Closed
CRL = 15pF (Figures 2, 8), S2 Closed
CRL = 15pF (Figures 2, 8), S1 Closed
CRL = 15pF (Figures 2, 8), S2 Closed
DE = 0, RE =
MIN
q 150
q 150
q
q 150
q 100
q 100
q 150
q 150
q 30
q 30
q
q
q
q
q
q 250
q 50
TYP
MAX
1200
1200
250
600
1200
1500
1500
1500
1500
140
250
140
250
13
20
50
20
50
20
50
20
50
200
600
UNITS
V
V
V
V
V
mV
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
kbps
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
sn1487 1487fs
3
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