–VO LTC490 F03 D 3V 0V 1.5V tPLH 1.5V
參數(shù)資料
型號: LTC490IS8
廠商: Linear Technology
文件頁數(shù): 8/12頁
文件大?。?/td> 0K
描述: IC TXRX RS485 LOWPWR DIFF 8-SOIC
標(biāo)準(zhǔn)包裝: 100
類型: 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: RS422,RS485
電源電壓: 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 管件
5
LTC490
490fb
–VO
LTC490 F03
D
3V
0V
1.5V
tPLH
1.5V
VDIFF = V(Y) – V(Z)
VO
80%
20%
50%
10%
Z
Y
tSKEW
tr
f = 1MHz : tr ≤ 10ns : tf ≤ 10ns
90%
50%
tPHL
tf
VO
tSKEW
1/2 VO
UU
U
PI FU CTIO S
VCC (Pin 1): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.
R (Pin 2): Receiver Output. If A > B by 200mV, R will be
high. If A < B by 200mV, then R will be low.
D (Pin 3): Driver Input. A low on D forces the driver outputs
Y low and Z high. A high on D will force Y high and Z low.
GND (Pin 4): Ground Connection.
Y (Pin 5): Driver Output.
Z (Pin 6): Driver Output.
B (Pin 7): Receiver Input.
A (Pin 8): Receiver Input.
Figure 4. Receiver Propagation Delays
Figure 3. Driver Propagation Delays
Figure 1. Driver DC Test Load
Figure 2. Driver/Receiver Timing Test Circuit
TEST CIRCUITS
LTC490 F01
Y
Z
R
VOD2
VOC
LTC490 F02
DRIVER
D
Y
Z
RECEIVER
RDIFF
A
B
15pF
CL1
CL2
R
SWITCHI G TI E WAVEFOR S
UW
W
VOL
LTC490 F04
A-B
VOD2
0V
tPLH
0V
OUTPUT
VOH
1.5V
f = 1MHz ; tr ≤ 10ns : tf ≤ 10ns
tPHL
–VOD2
1.5V
INPUT
R
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