LTC2851 LINER [Linear Technology], LTC2851 Datasheet - Page 4

• Manufacturer Part Number: LTC2851
• Description: 20Mbps RS485 Transceivers
• Manufacturer: LINER [Linear Technology]

LTC2859/LTC2861
swiTchinG characTerisTics
temperature range, otherwise specifications are at T
SYMBOL
Driver in Normal Mode (SLO HIGH)
f
t
Dt
t
t
t
t
t
t
Driver in SLO Mode (SLO LOW)
f
t
Dt
t
t
t
t
t
t
Receiver
t
t
t
t
t
t
t
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime..
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
4
MAX
PLHD
SKEWD
RD
ZLD
HZD
ZHSD
SHDN
MAXS
PLHDS,
SKEWDS
RDS,
ZHDS,
LZDS,
ZHSDS,
SHDNS
PLHR
SKEWR
RR
ZLR
HZR
ZHSR
RTEN
PD
PDS
, t
, t
, t
, t
FD
FR
, t
, t
, t
t
, t
, t
ZHD
ZHR
FDS
t
t
HZDS
ZLDS
RTZ
PHLD
ZLSD
PHLR
ZLSR
t
t
PHLDS
ZLSDS
, t
, t
LZD
LZR
,
,
PARAMETER
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|t
Driver Output Y to Output Z
Driver Rise or Fall Time
Driver Enable or Disable Time
Driver Enable from Shutdown
Time to Shutdown
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|t
Driver Output A to Output B
Driver Rise or Fall Time
Driver Enable Time
Driver Disable Time
Driver Enable from Shutdown
Time to Shutdown
Receiver Input to Output
Differential Receiver Skew
|t
Receiver Output Rise or Fall Time
Receiver Enable/Disable
Receiver Enable from Shutdown
Termination Enable or Disable Time
PLHD
PLHR
PLHR
-t
-t
-t
PHLD
PHLR
PHLR
|
|
|
CONDITIONS
Note 3
R
R
R
R
R
R
(DE = ↓, RE = V
(Figure 4)
Note 3
R
R
R
(H-Grade)
R
R
R
R
(DE = 0, RE = ↑) or (DE = ↓, RE = V
C
4ns (Figure 5)
C
C
R
DI = 0 or V
R
DI = 0 or V
V
L
L
L
B
DIFF
DIFF
DIFF
DIFF
L
L
DIFF
DIFF
DIFF
DIFF
L
L
L
L
L
A
= 15pF, V
= 15pF (Figure 5)
= 15pF (Figure 5)
= 0V, V
= 500Ω, C
= 500Ω, C
= 500Ω, C
= 500Ω, C
= 500Ω, C
= 1kΩ, C
= 1kΩ, C
= 25°C, V
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
The
AB
CC
CC
L
L
CM
= 2V, RE = V
L
L
L
L
L
=15pF, DE = V
= 15pF, DE = 0V (Figure 6)
l
L
L
L
L
L
L
L
L
= 50pF, RE = 0 (Figure 4)
= 50pF, RE = V
= 50pF, RE = 0 (Figure 4)
= 50pF, RE = 0 (Figure 4)
= 50pF, RE = V
CC
= 1.5V, |V
= 100pF (Figure 3)
= 100pF (Figure 3)
CC
= 100pF (Figure 3)
= 100pF (Figure 3)
= 100pF (Figure 3)
= 100pF (Figure 3)
= 100pF (Figure 3)
= 100pF (Figure 3)
denotes the specifications which apply over the full operating
= 5V, T
) or (DE = 0, RE ↑)
Note 3: Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
AB
CC
E
| = 1.5V, t
CC
, DE = 0V (Figure 7)
= 0 unless otherwise noted (Note 2).
CC
CC
(Figure 6)
(Figure 4)
(Figure 4)
CC
R
) (Figure 4)
and t
F
<
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
250
20
0.95
TYP
200
200
0.9
10
50
50
1
1
4
1
3
±500
±750
MAX
12.5
12.5
100
500
300
500
100
1.5
1.5
50
±6
70
70
70
50
6
8
8
6
8
285961fc
UNITS
Mbps
kbps
ns
ns
ns
ns
ns
µs
ns
µs
ns
ns
ns
µs
ns
ns
µs
ns
ns
ns
ns
ns
µs
µs