LTC2854 LINER [Linear Technology], LTC2854 Datasheet - Page 4

• Manufacturer Part Number: LTC2854
• Description: 3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination
• Manufacturer: LINER [Linear Technology]

LTC2854/LTC2855
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
I
I
I
I
I
I
ESD Protection
SWITCHING CHARACTERISTICS
SYMBOL
Driver
f
t
Δt
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 specifi ed.
temperature range, otherwise specifi cations are at T
4
CCT
CCTR
CCTERM
CCTERMR
CCTERMT
CCTERMTR
MAX
PLHD
SKEWD
RD
ZLD
HZD
ZHSD
SHDN
PLHR
SKEWR
RR
ZLR
HZR
ZHSR
RTEN
PD
, t
, t
, t
, t
FD
FR
, t
, t
, t
, t
, t
ZHD
ZHR
RTZ
PHLD
ZLSD
PHLR
ZLSR
, t
, t
LZD
LZR
,
,
PARAMETER
Supply Current in Transmit Mode
Supply Current with Both Driver and
Receiver Enabled
Supply Current in Termination Mode
Supply Current in Receive and
Termination Mode
Supply Current in Transmit and
Termination Mode
Supply Current with Driver, Receiver
and Termination Enabled
ESD Protection for RS485/RS422 Pins
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
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
-t
-t
PHLD
PHLR
|
|
CONDITIONS
No Load, DE = V
No Load, DE = V
DE = 0V, ⎯ R ⎯ E = V
DE = 0V, ⎯ R ⎯ E = 0V, TE = V
DE = V
DE = V
A, B on LTC2854, Human Body Model
Y, Z, A, B on LTC2855, Human Body Model
A
A
= 25°C, V
= 25°C, V
CONDITIONS
Note 3
R
R
R
R
R
R
(DE = ↓, ⎯ R ⎯ E = V
(Figure 5)
C
t
C
C
R
R
V
(Figure 8)
F
CC
CC
L
L
L
B
DIFF
DIFF
DIFF
DIFF
L
L
L
L
< 4ns (Figure 6)
= 15pF, V
= 15pF (Figure 6)
= 15pF (Figure 6)
= 0V, V
= 500Ω, C
= 500Ω, C
= 1k, C
= 1k, C
, ⎯ R ⎯ E = V
, ⎯ R ⎯ E = 0V, TE = V
The
The
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 54Ω, C
●
●
CC
CC
AB
L
L
CC
CC
CC
denotes the specifi cations which apply over the full operating
CC
denotes the specifi cations which apply over the full operating
=15pF, DE = V
= 15pF, DE = 0V (Figure 7)
CM
= 3.3V, T
, TE = V
= 3.3V, T
= 2V, ⎯ R ⎯ E = V
, ⎯ R ⎯ E = V
, ⎯ R ⎯ E = 0V, TE = 0V
L
L
, TE = V
L
L
L
L
= 50pF, ⎯ R ⎯ E = 0 (Figure 5)
= 50pF, ⎯ R ⎯ E = V
= 1.5V, |V
CC
= 100pF (Figure 4)
= 100pF (Figure 4)
= 100pF (Figure 4)
= 100pF (Figure 4)
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.
Overtemperature protection activates at a junction temperature exceeding
150°C. Continuous operation above the specifi ed maximum operating
junction temperature may result in device degradation or failure.
) or (DE = 0, ⎯ R ⎯ E ↑)
CC
CC
CC
CC
CC
E
E
, TE = 0V
= 0V unless otherwise noted (Note 2).
= 0V unless otherwise noted (Note 2).
AB
CC
CC
| = 1.5V, t
, DE = 0V
(Figure 7)
CC
(Figure 5)
R
and
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
MIN
20
TYP
TYP
450
450
110
450
470
470
±25
±15
10
50
1
1
4
1
3
1000
1000
1000
1000
MAX
MAX
12.5
12.5
180
950
100
100
50
±6
70
70
50
6
8
6
8
285455fa
UNITS
UNITS
Mbps
μA
μA
μA
μA
μA
μA
kV
kV
ns
ns
ns
ns
ns
μs
ns
ns
ns
ns
ns
μs
μs