參數(shù)資料
型號(hào)： LTC1487
廠商： Linear Technology Corporation
英文描述： Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance
中文描述： 超低功耗485的低EMI，關(guān)機(jī)和高輸入阻抗
文件頁數(shù)： 3/8頁
文件大?。?/td> 224K
代理商： LTC1487
3
LTC1487
ELECTRICAL C
HARA TERISTICS
–40
°
C
≤
T
A
≤
85
°
C, V
CC
= 5V (Note 4) unless otherwise noted.
SYMBOL
V
OD1
V
OD2
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (with Load)
CONDITIONS
I
O
= 0
R = 50
(RS422)
R = 27
(RS485), Figure 1
R = 27
or R = 50
, Figure 1
–7V
≤
V
CM
≤
12V
V
CM
= 0V
No Load, Output Enabled
No Load, Output Disabled
DE = 0V, RE = V
CC
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
(Figures 3, 5)
MIN
TYP
MAX
5
UNITS
G
V
V
V
V
V
G
G
2.0
1.5
5
3
V
OC
V
TH
V
TH
I
CC
Driver Common-Mode Output Voltage
Differential Input Threshold Voltage for Receiver
Receiver Input Hysteresis
Supply Current
G
G
–0.2
0.2
G
45
120
80
1
mV
μ
A
μ
A
μ
A
ns
ns
ns
ns
ns
ns
ns
kbps
G
G
200
120
10
1200
1200
600
2000
250
250
I
SHDN
t
PLH
t
PHL
t
SKEW
t
r
, t
f
t
PLH
t
PHL
t
SKD
f
MAX
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
t
PLH
– t
PHL
Differential Receiver Skew
Maximum Data Rate
G
150
150
G
G
100
G
150
30
30
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
(Figures 3, 7)
G
140
140
13
G
G
G
250
SYMBOL
t
PLH
t
PHL
t
SKEW
t
r
, t
f
t
ZH
t
ZL
t
LZ
t
HZ
t
PLH
t
PHL
t
SKD
t
ZL
t
ZH
t
LZ
t
HZ
f
MAX
t
SHDN
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
t
PLH
– t
PHL
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
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
(Figures 3, 5)
MIN
150
150
TYP
MAX
1200
1200
600
1200
1500
1500
1500
1500
250
250
UNITS
G
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
G
G
250
G
150
100
100
150
150
30
30
C
L
= 100pF (Figures 4, 6), S2 Closed
C
L
= 100pF (Figures 4, 6), S1 Closed
C
L
= 15pF (Figures 4, 6), S1 Closed
C
L
= 15pF (Figures 4, 6), S2 Closed
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
(Figures 3, 7)
G
G
G
G
G
140
140
13
20
20
20
20
G
G
C
RL
= 15pF (Figures 2, 8), S1 Closed
C
RL
= 15pF (Figures 2, 8), S2 Closed
C
RL
= 15pF (Figures 2, 8), S1 Closed
C
RL
= 15pF (Figures 2, 8), S2 Closed
G
50
50
50
50
G
G
G
G
250
50
kbps
DE = 0, RE =
G
200
600
ns
0
°
C
≤
T
A
≤
70
°
C, V
CC
= 5V (Notes 2, 3) unless otherwise noted.
SWITCHU
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