LTM2881_12 Datasheet, PDF (4/24 Pages) Linear Technology – Complete Isolated RS485/RS422 μModule

LTM2881
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. LTM2881-3 V_CC = 3.3V, LTM2881-5 V_CC = 5.0V, V_L = 3.3V, GND = GND2 =
0V, ON = V_L unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Logic
V_IL
Logic Input Low Voltage
1.62V ≤ V_L ≤ 5.5V
V_IH
D_IN
SLO
Logic Input High Voltage
DI, TE, DE, ON, RE:
V_L ≥ 2.35V
1.62V ≤ V_L < 2.35V
I_INL
Logic Input Current
V_HYS
Logic Input Hysteresis
(Note 2)
V_OH
Output High Voltage
Output High, I_LOAD = –4mA
(Sourcing), 5.5V ≥ V_L ≥ 3V
Output High, I_LOAD = –1mA
(Sourcing), 1.62V ≤ V_L < 3V
V_OL
Output Low Voltage
Output Low, I_{LO AD} = 4mA
(Sinking), 5.5V ≥ V_L ≥ 3V
Output High, I_LOAD = 1mA
(Sinking), 1.62V ≤ V_L < 3V
I_OZR
Three-State (High Impedance) RE = V_L, 0V ≤ RO ≤ V_L
Output Current on RO
l
l 0.67•V_CC2
l
2
0.4
V
V
V
l 0.67•V_L
V
l 0.75•V_L
V
l
0 ±1
μA
150
mV
l V_L –0.4
V
l V_L –0.4
V
l
0.4
V
l
0.4
V
l
±1
μA
I_OSR
Short-Circuit Current
0V ≤ (RO or D_OUT) ≤ V_L
l
±85
mA
SWITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. LTM2881-3 V_CC = 3.3V, LTM2881-5 V_CC = 5.0V, V_L = 3.3V, GND = GND2 =
0V, ON = V_L unless otherwise noted.
SYMBOL PARAMETER
Driver SLO = V_CC2
f_MAX
Maximum Data Rate
t_PLHD
t_PHLD
Driver Input to Output
Δt_PD
Driver Input to Output Difference
|t_PLHD – t_PHLD|
t_SKEWD
Driver Output Y to Output Z
CONDITIONS
(Note 3)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
MIN TYP MAX UNITS
20
l
l
l
Mbps
60 85
ns
18
ns
1 ±8
ns
t_RD
Driver Rise or Fall Time
t_FD
t_ZLD, t_ZHD, Driver Output Enable or Disable
t_LZD, t_HZD Time
Driver SLO = GND2
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
R_L = 500Ω, C_L = 50pF
(Figure 5)
l
4 12.5
ns
l
170
ns
f_MAX
t_PLHD
t_PHLD
Δt_PD
t_SKEWD
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|t_PLHD – t_PHLD|
Driver Output Y to Output Z
(Note 3)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
R_DIFF = 54Ω, C_L = 100pF
(Figure 4)
250
kbps
1 1.55
μs
50 500
ns
±200 ±500
ns
2881fe
4