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LTC1487CS8 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1487CS8
功能描述  Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance
PDF  8 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1487CS8 数据表(HTML) 3 Page - Linear Technology

  LTC1487CS8 Datasheet HTML 1Page - Linear Technology LTC1487CS8 Datasheet HTML 2Page - Linear Technology LTC1487CS8 Datasheet HTML 3Page - Linear Technology LTC1487CS8 Datasheet HTML 4Page - Linear Technology LTC1487CS8 Datasheet HTML 5Page - Linear Technology LTC1487CS8 Datasheet HTML 6Page - Linear Technology LTC1487CS8 Datasheet HTML 7Page - Linear Technology LTC1487CS8 Datasheet HTML 8Page - Linear Technology  
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LTC1487
ELECTRICAL C
C
HARA TERISTICS –40°C ≤ T
A ≤ 85°C, VCC = 5V (Note 4) unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOD1
Differential Driver Output Voltage (Unloaded)
IO = 0
q
5V
VOD2
Differential Driver Output Voltage (with Load)
R = 50
Ω (RS422)
q
2.0
V
R = 27
Ω (RS485), Figure 1
q
1.5
5
V
VOC
Driver Common-Mode Output Voltage
R = 27
Ω or R = 50Ω, Figure 1
q
3V
VTH
Differential Input Threshold Voltage for Receiver
– 7V
≤ VCM ≤ 12V
q
– 0.2
0.2
V
∆VTH
Receiver Input Hysteresis
VCM = 0V
q
45
mV
ICC
Supply Current
No Load, Output Enabled
q
120
200
µA
No Load, Output Disabled
q
80
120
µA
ISHDN
Supply Current in Shutdown Mode
DE = 0V, RE = VCC
110
µA
tPLH
Driver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
150
1200
ns
tPHL
Driver Input to Output
q
150
1200
ns
tSKEW
Driver Output to Output
q
100
600
ns
tr, tf
Driver Rise or Fall Time
q
150
2000
ns
tPLH
Receiver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
30
140
250
ns
tPHL
Receiver Input to Output
q
30
140
250
ns
tSKD
tPLH – tPHLDifferential Receiver Skew
q
13
ns
fMAX
Maximum Data Rate
q
250
kbps
(Figures 3, 5)
(Figures 3, 7)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tPLH
Driver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
150
1200
ns
tPHL
Driver Input to Output
q
150
1200
ns
tSKEW
Driver Output to Output
q
250
600
ns
tr, tf
Driver Rise or Fall Time
q
150
1200
ns
tZH
Driver Enable to Output High
CL = 100pF (Figures 4, 6), S2 Closed
q
100
1500
ns
tZL
Driver Enable to Output Low
CL = 100pF (Figures 4, 6), S1 Closed
q
100
1500
ns
tLZ
Driver Disable Time from Low
CL = 15pF (Figures 4, 6), S1 Closed
q
150
1500
ns
tHZ
Driver Disable Time from High
CL = 15pF (Figures 4, 6), S2 Closed
q
150
1500
ns
tPLH
Receiver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
30
140
250
ns
tPHL
Receiver Input to Output
q
30
140
250
ns
tSKD
tPLH – tPHLDifferential Receiver Skew
q
13
ns
tZL
Receiver Enable to Output Low
CRL = 15pF (Figures 2, 8), S1 Closed
q
20
50
ns
tZH
Receiver Enable to Output High
CRL = 15pF (Figures 2, 8), S2 Closed
q
20
50
ns
tLZ
Receiver Disable from Low
CRL = 15pF (Figures 2, 8), S1 Closed
q
20
50
ns
tHZ
Receiver Disable from High
CRL = 15pF (Figures 2, 8), S2 Closed
q
20
50
ns
fMAX
Maximum Data Rate
q
250
kbps
tSHDN
Time to Shutdown
DE = 0, RE =
q
50
200
600
ns
0
°C ≤ TA ≤ 70°C, VCC = 5V (Notes 2, 3) unless otherwise noted.
SWITCHI G CHARACTERISTICS
(Figures 3, 5)
(Figures 3, 7)



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