LTC489IN Linear Technology, LTC489IN Datasheet - Page 6
![IC LINE RCVR RS485 QUAD 16-DIP](/photos/6/64/66499/161-16-dip_sml.jpg)
LTC489IN
Manufacturer Part Number
LTC489IN
Description
IC LINE RCVR RS485 QUAD 16-DIP
Manufacturer
Linear Technology
Type
Line Receiverr
Datasheet
1.LTC488CNPBF.pdf
(12 pages)
Specifications of LTC489IN
Number Of Drivers/receivers
0/4
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
LTC488/LTC489
TEST CIRCUITS
SWITCHING TIME WAVEFORMS
6
Note: The input pulse is supplied by a generator having the following characteristics:
INPUT
EN OR
EN12
A, B
RO
RO
RO
f = 1MHz, Duty Cycle = 50%, t
–V
V
V
V
0V
5V
3V
OH
0V
V
OL
D
V
OD2
OD2
OH
OL
Figure 2. Receiver Enable and Disable Timing Test Circuit
DRIVER
Figure 4. Receiver Enable and Disable Times
RECEIVER
OUTPUT
1.5V
Figure 3. Receiver Propagation Delays
Figure 1. Receiver Timing Test Circuit
100pF
0V
t
ZH
t
ZL
t
PHL
f = 1MHz; t
f = 1MHz; t
1.5V
C
1.5V
L
r
< 10ns, t
1.5V
54Ω
r
≤ 10ns; t
100pF
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
r
1k
INPUT
≤ 10ns; t
f
S2
S1
≤ 10ns, Z
f
≤ 10ns
f
A
B
≤ 10ns
1k
RECEIVER
OUT
= 50Ω
V
4889 F02
CC
1.5V
t
t
LZ
HZ
0V
t
PLH
C
4889 F01
L
RO
4889 F03
4889 F04
1.5V
0.5V
0.5V
4889fb