4
LTC2847
sn2847 2847fs
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, unless otherwise noted (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V.11 Receiver
V
TH
Input Threshold Voltage –7V ≤ V
CM
≤ 7V ● –0.2 0.2 V
∆V
TH
Input Hysteresis –7V ≤ V
CM
≤ 7V ● 15 40 mV
R
IN
Input Impedance –7V ≤ V
CM
≤ 7V (Figure 3) ● 100 103 Ω
t
r
, t
f
Rise or Fall Time C
L
= 50pF (Figures 4, 14) 15 ns
t
PLH
Input to Output Rising C
L
= 50pF (Figures 4, 14) ● 50 90 ns
t
PHL
Input to Output Falling C
L
= 50pF (Figures 4, 14) ● 50 90 ns
∆t Input to Output Difference, t
PLH
– t
PHL
C
L
= 50pF (Figures 4, 14) ● 0425 ns
V.35 Driver
V
OD
Differential Output Voltage Open Circuit, R
L
= 1.95k (Figure 5) ● ±1.2 V
With Load, –4V ≤ V
CM
≤ 4V (Figure 6) ±0.44 ±0.55 ±0.66 V
V
OA
, V
OB
Single-Ended Output Voltage Open Circuit, R
L
= 1.95k (Figure 5) ● ±1.2 V
V
OC
Transmitter Output Offset R
L
= 50Ω (Figure 5) ● ±0.6 V
I
OH
Transmitter Output High Current V
A
,
V
B
= 0V ● –9 –11 –13 mA
I
OL
Transmitter Output Low Current V
A
,
V
B
= 0V ● 91113 mA
I
OZ
Transmitter Output Leakage Current V
A
and V
B
≤ 0.25V ● ±1 ±100 µA
R
OD
Transmitter Differential Mode Impedance ● 50 100 150 Ω
R
OC
Transmitter Common Mode Impedance –2V ≤ V
CM
≤ 2V (Figure 7) 135 150 165 Ω
t
r
, t
f
Rise or Fall Time (Figures 8, 13) 5 ns
t
PLH
Input to Output (Figures 8, 13) ● 15 35 65 ns
t
PHL
Input to Output (Figures 8, 13) ● 15 35 65 ns
∆t Input to Output Difference, t
PLH
– t
PHL
(Figures 8, 13) ● 016 ns
t
SKEW
Output to Output Skew (Figures 8, 13) 4 ns
V.35 Receiver
V
TH
Differential Receiver Input Threshold Voltage –2V ≤ V
CM
≤ 2V (Figure 9) ● –0.2 0.2 V
∆V
TH
Receiver Input Hysteresis –2V ≤ V
CM
≤ 2V (Figure 9) ● 15 40 mV
R
ID
Receiver Differential Mode Impedance –2V ≤ V
CM
≤ 2V ● 90 103 110 Ω
R
IC
Receiver Common Mode Impedance –2V ≤ V
CM
≤ 2V (Figure 10) 135 150 165 Ω
t
r
, t
f
Rise or Fall Time C
L
= 50pF (Figures 4, 14) 15 ns
t
PLH
Input to Output C
L
= 50pF (Figures 4, 14) ● 50 90 ns
t
PHL
Input to Output C
L
= 50pF (Figures 4, 14) ● 50 90 ns
∆t Input to Output Difference, t
PLH
– t
PHL
C
L
= 50pF (Figures 4, 14) ● 0425 ns
V.28 Driver
V
O
Output Voltage Open Circuit ● ±10 V
R
L
= 3k (Figure 11) ● ±5 ±8.5 V
I
SS
Short-Circuit Current V
OUT
= GND ● ±150 mA
R
OZ
Power-Off Resistance –2V < V
O
< 2V, Power Off ● 300 Ω
or No-Cable Mode
SR Slew Rate R
L
= 7k, C
L
= 0 (Figures 11, 15) ● 430V/µs
t
PLH
Input to Output R
L
= 3k, C
L
= 2500pF (Figures 11, 15) ● 1.5 2.5 µs
t
PHL
Input to Output R
L
= 3k, C
L
= 2500pF (Figures 11, 15) ● 1.5 2.5 µs
