LTC1482CMS8 Linear Technology, LTC1482CMS8 Datasheet - Page 8

• Manufacturer Part Number: LTC1482CMS8
• Description: IC TXRX RS485 LOWPWR 8-MSOP
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC1482CMS8

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1482
PIN
RO (Pin 1): Receiver Output. If a carrier is present (CD low)
and the part is not in shutdown, RO is high if the receiver
input differential voltage (A – B) V
(A – B) V
if a carrier is not present (CD = 1). In shutdown, RO is
three-stated. If the driver is enabled, RO follows the logic
level at the driver input.
CD (Pin 2): Open-Drain Carrier Detect Output. Provided
that the part is not in shutdown, the CD output is low if
V
< (A – B) < V
the A and B pins are driven by the internal (DE = 1) or an
8
TYPICAL PERFOR A CE CHARACTERISTICS
THCD(MIN)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
U
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0
0
0
–55
Driver Output High Voltage vs
Output Current
Driver Skew vs Temperature
FUNCTIONS
V
–35 –15
CC
= 4.75V
THRO(MIN)
U
OUTPUT CURRENT (mA)
THCD(MAX)
(A – B) V
TEMPERATURE ( C)
5
25
. RO is forced to high (fail-safe state)
U
45
. This is true regardless of whether
THCD(MAX)
65
85 105 125
W
1482 G31
1482 G34
U
and high if V
THRO(MAX)
3.0
2.5
2.0
1.5
1.0
0.5
40
35
30
25
20
15
10
0
5
0
4.5
0
Driver Output Low Voltage vs
Output Current
Driver Propagation Delay vs
Supply Voltage
and low if
THCD(MIN)
V
T
10 20 30 40 50 60 70 80 90 100
CC
A
= 25 C
= 4.75V
4.75
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
t
t
PHL
PLH
5
external (DE = 0) driver. A weak internal pull-up removes
the need for an external pull-up resistor if fast rise times
are not important. Several LTC1482s can share the same
CD line. CD = 1 forces RO to the high fail-safe state. In
shutdown, CD is three-stated. This pin can be pulled above
V
DE (Pin 3): Driver Enable Input. DE = 0 disables or three-
states the driver outputs. DE = 1 enables the driver outputs
with the high/low state of the outputs set by DI/SHDN.
DI/SHDN (Pin 4): Driver Input and Shutdown Input. It is
used together with the DE pin to put the part in shutdown
CC
but should not be taken above 8V to avoid damage.
5.25
1482 G32
1482 G35
5.5
250
200
150
100
40
35
30
25
20
15
10
50
5
0
0
–55
–55
Driver Propagation Delay vs
Temperature
Driver Short-Circuit Current vs
Temperature
V
–35 –15
–35 –15
CC
= 5V
DRIVER OUTPUT HIGH
SHORT TO –7V
DRIVER OUTPUT LOW
SHORT TO 10V
TEMPERATURE ( C)
TEMPERATURE ( C)
5
5
25
25
t
t
PLH
PHL
45
45
65
65
V
CC
85 105 125
85 105 125
= 5.25V
1482 G33
1482 G36