Datasheet

2
LTC485
sn485 LTC485ffs
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V ±5%, unless otherwise noted. (Notes 2 and 3)
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Note 1)
Supply Voltage ....................................................... 12V
Control Input Voltages ................... –0.5V to V
CC
+ 0.5V
Driver Input Voltage....................... – 0.5V to V
CC
+ 0.5V
Driver Output Voltage ........................................... ±14V
Receiver Input Voltage.......................................... ±14V
Receiver Output Voltages .............. –0.5V to V
CC
+ 0.5V
Operating Temperature Range
LTC485I...................................... –40°C ≤ T
A
≤ 85°C
LTC485C ......................................... 0°C ≤ T
A
≤ 70°C
LTC485M (OBSOLETE) .......... –55°C ≤ T
A
≤ 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
S8 PART MARKING
LTC485CN8
LTC485CS8
LTC485IN8
LTC485IS8
485
485I
T
JMAX
= 125°C, θ
JA
= 100°C/ W (N)
T
JMAX
= 150°C, θ
JA
= 150°C/ W (S)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 ● 5V
V
OD2
Differential Driver Output Voltage (with Load) R = 50Ω (RS422) ● 2V
R = 27Ω (RS485), Figure 1
● 1.5 5 V
∆V
OD
Change in Magnitude of Driver Differential R = 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary States
V
OC
Driver Common Mode Output Voltage R = 27Ω or R = 50Ω, Figure 1 ● 3V
∆⏐V
OC
⏐ Change in Magnitude of Driver Common-Mode R = 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary States
V
IH
Input High Voltage DE, DI, RE ● 2V
V
IL
Input Low Voltage DE, DI, RE ● 0.8 V
I
IN1
Input Current DE, DI, RE ● ±2 µA
I
IN2
Input Current (A, B) DE = 0, V
CC
= 0V V
IN
= 12V ● ±1mA
or 5.25V
V
IN
= –7V ● –0.8 mA
V
TH
Differential Input Threshold Voltage –7V ≤ V
CM
≤ 12V ● –0.2 0.2 V
for Receiver
∆V
TH
Receiver Input Hysteresis V
CM
= 0V ● 70 mV
V
OH
Receiver Output High Voltage I
O
= –4mA, V
ID
= 200mV ● 3.5 V
V
OL
Receiver Output Low Voltage I
O
= 4mA, V
ID
= – 200mV ● 0.4 V
I
OZR
Three-State (High Impedance) Output V
CC
= Max, 0.4V ≤ V
O
≤ 2.4V ● ±1 µA
Current at Receiver
R
IN
Receiver Input Resistance –7V ≤ V
CM
≤ 12V ● 12 kΩ
E
LECTR
IC
AL C CHARA TERIST
ICS
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC485CJ8
LTC485MJ8
J8 PACKAGE
8-LEAD CERAMIC DIP
N8 PACKAGE
8-LEAD PLASTIC DIP
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
B
A
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
R
D
RO
RE
DE
DI
T
JMAX
= 155°C, θ
JA
= 100°C/ W (J)
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source