Datasheet
3
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
–
Negative Charge Pump Output Voltage V.28 Mode, No Load –9.6 V
V.28 Mode, Full Load
● –7.5 –8.5 V
V.35 Mode
● –5.5 –6.5 V
RS530, RS530-A, X.21 Modes, Full Load
● –4.5 –6.0 V
f
OSC
Charge Pump Oscillator Frequency 500 kHz
t
r
Charge Pump Rise Time No-Cable Mode/Power-Off to Normal Operation 2 ms
Logic Inputs and Outputs
V
IH
Logic Input High Voltage D1, D2, D3, M0, M1, M2, DCE/DTE ● 2.0 V
V
IL
Logic Input Low Voltage D1, D2, D3, M0, M1, M2, DCE/DTE ● 0.8 V
I
IN
Logic Input Current D1, D2, D3 ● ±10 µA
M0, M1, M2, DCE/DTE = GND
● –30 –75 –120 µA
M0, M1, M2, DCE/DTE = V
IN
● ±10 µA
V
OH
Output High Voltage I
O
= –3mA ● 2.7 3 V
V
OL
Output Low Voltage I
O
= 1.6mA ● 0.2 0.4 V
I
OSR
Output Short-Circuit Current 0V ≤ V
O
≤ V
IN
● ±50 mA
I
OZR
Three-State Output Current M0 = M1 = M2 = V
IN
, V
O
= GND ● –30 –85 –160 µA
M0 = M1 = M2 = V
IN
, V
O
= V
IN
● ±10 µA
V.11 Driver
V
ODO
Open Circuit Differential Output Voltage R
L
= 1.95k (Figure 1) ● ± 5V
V
ODL
Loaded Differential Output Voltage R
L
= 50Ω (Figure 1) 0.5V
ODO
0.67V
ODO
V
R
L
= 50Ω (Figure 1) ● ±2V
∆V
OD
Change in Magnitude of Differential R
L
= 50Ω (Figure 1) ● 0.2 V
Output Voltage
V
OC
Common Mode Output Voltage R
L
= 50Ω (Figure 1) ● 3V
∆V
OC
Change in Magnitude of Common Mode R
L
= 50Ω (Figure 1) ● 0.2 V
Output Voltage
I
SS
Short-Circuit Current V
OUT
= GND ±150 mA
I
OZ
Output Leakage Current V
A
and V
B
≤ 0.25V, Power Off or ● ±1 ±100 µA
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time (Figures 2, 13) ● 21525 ns
t
PLH
Input to Output Rising (Figures 2, 13) ● 15 40 65 ns
t
PHL
Input to Output Falling (Figures 2, 13) ● 15 40 65 ns
∆t Input to Output Difference, t
PLH
– t
PHL
(Figures 2, 13) ● 0312 ns
t
SKEW
Output to Output Skew (Figures 2, 13) 3 ns