LTC488IN Linear Technology, LTC488IN Datasheet - Page 6

• Manufacturer Part Number: LTC488IN
• Description: IC LINE RCVR RS485 QUAD 16-DIP
• Manufacturer: Linear Technology
• Type: Line Receiverr

Specifications of LTC488IN

• 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