Datasheet

3
LTC1487
sn1487 1487fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 150 1200 ns
t
PHL
Driver Input to Output ● 150 1200 ns
t
SKEW
Driver Output to Output ● 250 600 ns
t
r
, t
f
Driver Rise or Fall Time ● 150 1200 ns
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 4, 6), S2 Closed ● 100 1500 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 100 1500 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 4, 6), S1 Closed ● 150 1500 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 4, 6), S2 Closed ● 150 1500 ns
t
PLH
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 140 250 ns
t
PHL
Receiver Input to Output ● 30 140 250 ns
t
SKD
t
PLH
– t
PHL
 Differential Receiver Skew ● 13 ns
t
ZL
Receiver Enable to Output Low C
RL
= 15pF (Figures 2, 8), S1 Closed ● 20 50 ns
t
ZH
Receiver Enable to Output High C
RL
= 15pF (Figures 2, 8), S2 Closed ● 20 50 ns
t
LZ
Receiver Disable from Low C
RL
= 15pF (Figures 2, 8), S1 Closed ● 20 50 ns
t
HZ
Receiver Disable from High C
RL
= 15pF (Figures 2, 8), S2 Closed ● 20 50 ns
f
MAX
Maximum Data Rate ● 250 kbps
t
SHDN
Time to Shutdown DE = 0, RE = ● 50 200 600 ns
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 ● 5V
V
OD2
Differential Driver Output Voltage (with Load) R = 50Ω (RS422) ● 2.0 V
R = 27Ω (RS485), Figure 1
● 1.5 5 V
V
OC
Driver Common-Mode Output Voltage R = 27Ω or R = 50Ω, Figure 1 ● 3V
V
TH
Differential Input Threshold Voltage for Receiver –7V ≤ V
CM
≤ 12V ● –0.2 0.2 V
∆V
TH
Receiver Input Hysteresis V
CM
= 0V ● 45 mV
I
CC
Supply Current No Load, Output Enabled ● 120 200 µA
No Load, Output Disabled
● 80 120 µA
I
SHDN
Supply Current in Shutdown Mode DE = 0V, RE = V
CC
110µA
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 150 1200 ns
t
PHL
Driver Input to Output ● 150 1200 ns
t
SKEW
Driver Output to Output ● 100 600 ns
t
r
, t
f
Driver Rise or Fall Time ● 150 2000 ns
t
PLH
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 140 250 ns
t
PHL
Receiver Input to Output ● 30 140 250 ns
t
SKD
t
PLH
– t
PHL
 Differential Receiver Skew ● 13 ns
f
MAX
Maximum Data Rate ● 250 kbps
E
LECTR
IC
AL C CHARA TERIST
ICS
–40°C ≤ T
A
≤ 85°C, V
CC
= 5V (Note 4) unless otherwise noted.
(Figures 3, 5)
(Figures 3, 7)
0°C ≤ T
A
≤ 70°C, V
CC
= 5V (Notes 2, 3) unless otherwise noted.
SWITCHI G CHARACTERISTICS
U
(Figures 3, 5)
(Figures 3, 7)