Datasheet

3
LTC2844
sn2844 2844fs
The ● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, V
DD
= 8V, V
EE
= – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
P
D
Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 210 mW
All Digital Pins = GND or V
IN
) V.28 Mode, Full Load 54 mW
Logic Inputs and Outputs
V
IH
Logic Input High Voltage ● 2V
V
IL
Logic Input Low Voltage ● 0.8 V
I
IN
Logic Input Current D1, D2, D3, D4 ● ±10 µA
M0, M1, M2, DCE = GND
● –30 –75 –120 µA
M0, M1, M2, DCE = 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
= 0V ● –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
● ±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 –0.25V ≤ V
O
≤ 0.25V, Power Off or ● ±1 ±100 µA
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time LTC2844C (Figures 2, 5) ● 21525ns
LTC2844I (Figures 2, 5)
● 21535ns
t
PLH
Input to Output LTC2844C (Figures 2, 5) ● 20 40 65 ns
LTC28441 (Figures 2, 5)
● 20 40 75 ns
t
PHL
Input to Output LTC2844C (Figures 2, 5) ● 20 40 65 ns
LTC2844I (Figures 2, 5)
● 20 40 75 ns
∆t Input to Output Difference, t
PLH
– t
PHL
 LTC2844C (Figures 2, 5) ● 0312ns
LTC2844I (Figures 2, 5)
● 0317ns
t
SKEW
Output to Output Skew (Figures 2, 5) 3 ns
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
I
IN
Input Current (A, B) –10V ≤ V
A,B
≤ 10V ● ±0.66 mA
R
IN
Input Impedance –10V ≤ V
A,B
≤ 10V ● 15 30 kΩ
t
r
, t
f
Rise or Fall Time (Figures 2, 6) 15 ns
t
PLH
Input to Output LTC2844C C
L
= 50pF (Figures 2, 6) ● 50 80 ns
LTC2844I C
L
= 50pF (Figures 2, 6) ● 50 90 ns