Datasheet
3
LTC485
sn 485LTC485ffs
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
CC
= 5V ±5%, unless otherwise noted. (Notes 2 and 3)
Note 1: Absolute maximum ratings are those beyond which the safety of
the device cannot be guaranteed.
Note 2: All currents into device pins are positive; all currents out ot device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: All typicals are given for V
CC
= 5V and T
A
= 25°C.
Note 4: The LTC485 is guaranteed by design to be functional over a supply
voltage range of 5V ±10%. Data sheet parameters are guaranteed over the
tested supply voltage range of 5V ±5%.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Receiver Output High Voltage
vs Output Current
Receiver Output Low Voltage
vs Output Current
OUTPUT VOLTAGE (V)
0
0
OUTPUT CURRENT (mA)
4
12
16
20
1.0
36
LTC485 • TPC01
8
0.5 2.0
24
28
32
1.5
T
A
= 25°C
OUTPUT VOLTAGE (V)
5
0
OUTPUT CURRENT (mA)
–2
–6
–8
–10
3
–18
LTC485 • TPC02
–4
4
–12
–14
–16
2
T
A
= 25°C
TEMPERATURE (°C)
–50
3.0
OUTPUT VOLTAGE (V)
3.2
3.6
3.8
4.0
75
4.8
LTC485 • TPC03
3.4
0 125
4.2
4.4
4.6
–25
25 50
100
I = 8mA
Receiver Output High Voltage
vs Temperature
SWITCHI G CHARACTERISTICS
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
CC
Supply Current No Load, Pins 2, Outputs Enabled ● 500 900 µA
3, 4 = 0V or 5V
Outputs Disabled
● 300 500 µA
I
OSD1
Driver Short-Circuit Current, V
OUT
= HIGH V
O
= –7V ● 35 100 250 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= LOW V
O
= 10V ● 35 100 250 mA
I
OSR
Receiver Short-Circuit Current 0V ≤ V
O
≤ V
CC
● 785mA
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 10 30 50 ns
t
PHL
Driver Input to Output
(Figures 3 and 5)
● 10 30 50 ns
t
SKEW
Driver Output to Output ● 510ns
t
r
, t
f
Driver Rise or Fall Time ● 31525ns
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 4 and 6) S2 Closed ● 40 70 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 4 and 6) S1 Closed ● 40 70 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 4 and 6) S1 Closed ● 40 70 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 4 and 6) S2 Closed ● 40 70 ns
t
PLH
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 90 200 ns
t
PHL
(Figures 3 and 7)
● 30 90 200 ns
t
SKD
⏐t
PLH
– t
PHL
⏐ Differential Receiver Skew ● 13 ns
t
ZL
Receiver Enable to Output Low C
RL
= 15pF (Figures 2 and 8) S1 Closed ● 20 50 ns
t
ZH
Receiver Enable to Output High C
RL
= 15pF (Figures 2 and 8) S2 Closed ● 20 50 ns
t
LZ
Receiver Disable from Low C
RL
= 15pF (Figures 2 and 8) S1 Closed ● 20 50 ns
t
HZ
Receiver Disable from High C
RL
= 15pF (Figures 2 and 8) S2 Closed ● 20 50 ns