LTC1487 LINER [Linear Technology], LTC1487 Datasheet - Page 3

• Manufacturer Part Number: LTC1487
• Description: Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance
• Manufacturer: LINER [Linear Technology]

SWITCHI G CHARACTERISTICS
SYMBOL
V
V
V
V
I
I
t
t
t
t
t
t
t
f
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
f
t
ELECTRICAL C
CC
SHDN
PLH
PHL
SKEW
r
PLH
PHL
SKD
MAX
PLH
PHL
SKEW
r
ZH
ZL
LZ
HZ
PLH
PHL
SKD
ZL
ZH
LZ
HZ
MAX
SHDN
OD1
OD2
OC
TH
, t
, t
V
TH
f
f
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (with Load)
Driver Common-Mode Output Voltage
Differential Input Threshold Voltage for Receiver
Receiver Input Hysteresis
Supply Current
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
Maximum Data Rate
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
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
Maximum Data Rate
Time to Shutdown
t
t
PLH
PLH
U
– t
– t
PHL
PHL
Differential Receiver Skew
Differential Receiver Skew
HARA TERISTICS
C
CONDITIONS
R
(Figures 3, 5)
C
C
C
C
R
(Figures 3, 7)
C
C
C
C
DE = 0, RE =
L
L
L
L
RL
RL
RL
RL
DIFF
DIFF
CONDITIONS
I
R = 50 (RS422)
R = 27 (RS485), Figure 1
R = 27 or R = 50 , Figure 1
V
No Load, Output Enabled
No Load, Output Disabled
DE = 0V, RE = V
R
(Figures 3, 5)
R
(Figures 3, 7)
– 7V V
= 100pF (Figures 4, 6), S2 Closed
= 100pF (Figures 4, 6), S1 Closed
= 15pF (Figures 4, 6), S1 Closed
= 15pF (Figures 4, 6), S2 Closed
O
– 40 C T
CM
DIFF
DIFF
= 15pF (Figures 2, 8), S1 Closed
= 15pF (Figures 2, 8), S2 Closed
= 15pF (Figures 2, 8), S1 Closed
= 15pF (Figures 2, 8), S2 Closed
= 0
= 54 , C
= 54 , C
0 C T
= 0V
= 54 , C
= 54 , C
CM
A
L1
L1
A
12V
L1
L1
= C
= C
70 C, V
CC
85 C, V
= C
= C
L2
L2
L2
L2
= 100pF,
= 100pF,
= 100pF,
= 100pF,
CC
CC
= 5V (Notes 2, 3) unless otherwise noted.
= 5V (Note 4) unless otherwise noted.
– 0.2
MIN
MIN
150
150
150
250
150
150
150
100
100
150
150
250
2.0
1.5
30
30
50
30
30
TYP
TYP
140
140
200
120
100
140
140
250
45
80
13
13
20
20
20
20
1
LTC1487
1200
1200
2000
1200
1200
1200
1500
1500
1500
1500
MAX
MAX
600
250
250
600
200
120
600
250
250
0.2
10
50
50
50
50
5
5
3
UNITS
UNITS
3
kbps
kbps
mV
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
V
V
V
V
A
A
A