LTC2852_15 Datasheet, PDF (4/18 Pages) Linear Technology – 3.3V 20Mbps RS485/RS422 Transceivers

LTC2850/LTC2851/LTC2852
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 3.3V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Driver
|V_OD|
Δ|V_OD|
Differential Driver Output Voltage
Difference in Magnitude of Driver Differential
Output Voltage for Complementary Output
States
R = ∞, V_CC = 3V (Figure 1)
R = 27Ω, V_CC = 3V (Figure 1)
R = 50Ω, V_CC = 3.13V (Figure 1)
R = 27Ω or 50Ω (Figure 1)
l
l 1.5
l
2
l
V_CC
V
V_CC
V
V_CC
V
0.2
V
V_OC
Driver Common Mode Output Voltage
R = 27Ω or 50Ω (Figure 1)
l
Δ|V_OC|
Difference in Magnitude of Driver Common R = 27Ω or 50Ω (Figure 1)
l
Mode Output Voltage for Complementary
Output States
3
V
0.2
V
I_OZD
Driver Three-State (High Impedance) Output DE = 0V, (Y or Z) = –7V, 12V (LTC2852)
l
Current on Y and Z
±10
µA
I_OSD
Maximum Driver Short-Circuit Current
–7V ≤ (Y or Z) ≤ 12V (Figure 2)
±180 ±250
mA
l –250
300
mA
Receiver
I_IN
Receiver Input Current (A, B)
DE = TE = 0V, V_CC = 0V or 3.3V, V_IN = 12V
(Figure 3) (C, I-Grade)
DE = TE = 0V, V_CC = 0V or 3.3V, V_IN = –7V,
(Figure 3) (C, I-Grade)
l
l –100
125
µA
µA
DE = TE = 0V, V_CC = 0V or 3.3V, V_IN = 12V
(Figure 3) (H-Grade)
DE = TE = 0V, V_CC = 0V or 3.3V, V_IN = –7V,
(Figure 3) (H-Grade)
l
l –145
250
µA
µA
R_IN
Receiver Input Resistance
RE = V_CC or 0V, DE = TE = 0V,
l 96
125
kW
V_IN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(C, I-Grade)
RE = V_CC or 0V, DE = TE = 0V,
l 48
125
kW
V_IN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(H-Grade)
V_TH
Receiver Differential Input Threshold Voltage –7V ≤ B ≤ 12V
l
±0.2
V
ΔV_TH
Receiver Input Hysteresis
B = 0V
25
mV
V_OH
Receiver Output High Voltage
I(RO) = –4mA, A-B = 200mV, V_CC = 3V
l 2.4
V
V_OL
Receiver Output Low Voltage
I(RO) = 4mA, A-B = –200mV, V_CC = 3V
l
0.4
V
I_OZR
Receiver Three-State (High Impedance)
RE = V_CC, 0V ≤ RO ≤ V_CC (LTC2850, LTC2852) l
Output Current on RO
±1
µA
I_OSR
Logic
Receiver Short-Circuit Current
0V ≤ RO ≤ V_CC
l
±85
mA
V_IH
Logic Input High Voltage
V_IL
Logic Input Low Voltage
I_INL
Logic Input Current
V_CC = 3.6V
V_CC = 3V
l
2
l
l
V
0.8
V
0
±10
µA
285012fd