Datasheet

LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
4
285678ff
For more information www.linear.com/LTC2856-1
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Driver
|V
OD
| Differential Driver Output Voltage R = ∞, V
CC
= 4.5V (Figure 1)
l
V
CC
V
R = 27Ω (RS485), V
CC
= 4.5V (Figure 1)
l
1.5 V
CC
V
R = 50Ω (RS422), V
CC
= 4.5V (Figure 1)
l
2 V
CC
V
Δ|V
OD
|
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output
States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
V
OC
Driver Common Mode Output Voltage
R = 27Ω or R = 50Ω (Figure 1)
l
3 V
Δ|V
OC
|
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output
States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
I
OZD
Driver Three-State (High Impedance) Output
Current on Y and Z
DE = 0V, (Y or Z) = –7V, 12V, LTC2858-1,
LTC2858-2
l
±10 µA
I
OSD
Maximum Driver Short-Circuit Current –7V ≤ (Y or Z) ≤ 12V (Figure 2)
l
±120 ±250 mA
Receiver
I
IN
Receiver Input Current (A, B) DE = TE = 0V, V
CC
= 0V or 5V, V
IN
= 12V
(Figure 3) (C, I-Grade)
DE = TE = 0V, V
CC
= 0V or 5V, V
IN
= –7V,
(Figure 3) (C, I-Grade)
l
l
–100
125 µA
µA
DE = TE = 0V, V
CC
= 0V or 5V, V
IN
= 12V
(Figure 3) (H-Grade)
DE = TE = 0V, V
CC
= 0V or 5V, 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,
V
IN
= –7V, –3V, 3V, 7V, 12V (Figure 3)
(C, I-Grade)
l
96 125
kΩ
RE = V
CC
or 0V, DE = TE = 0V,
V
IN
= –7V, –3V, 3V, 7V, 12V (Figure 3)
(H-Grade)
l
48 125
kΩ
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
= 4.5V
l
2.4 V
V
OL
Receiver Output Low Voltage I(RO) = 4mA, A-B = –200mV, V
CC
= 4.5V
l
0.4 V
I
OZR
Receiver Three-State (High Impedance) Output
Current on RO
RE = 5V, 0V ≤ RO ≤ V
CC
, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l
±1 µA
Logic
V
IH
Logic Input High Voltage DE, DI, RE, V
CC
= 5.5V
l
2 V
V
IL
Logic Input Low Voltage DE, DI, RE, V
CC
= 4.5V
l
0.8 V
I
INL
Logic Input Current DE, DI, RE
l
0 ±10 µA
Supplies
I
CCS
Supply Current in Shutdown Mode DE = 0V, RE = V
CC
,
LTC2856, LTC2858 (C and I-Grade)
LTC2856, LTC2858 (H-Grade)
l
l
0
0
5
15
µA
µA
I
CCR
Supply Current in Receive Mode No Load, DE = 0V, RE = 0V, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l
540 900 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted. (Note 2)