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ISL3298EMRTEP Datasheet, PDF (3/9 Pages) Intersil Corporation – 9RS-485/RS-422 Transmitter
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ISL3298EMRTEP
Typical Operating Circuit
VCC
LOGIC
DEVICE
(µP, ASIC,
UART)
NETWORK WITH VL PIN FOR INTERFACING TO LOWER VOLTAGE LOGIC DEVICES
2.5V +3.3V TO 5V
+3.3V
1.8V
64
VL
VCC
+
0.1µF
+
0.1µF
8
1
VCC
VL
ISL3282EMRTEP
ISL3298EMRTEP
1 RO R
7 RE
A5
RT
B8
6Y
7Z
DI 3
D
DE 2
GND
2
GND
4, 5
VCC
LOGIC
DEVICE
(µP, ASIC,
UART)
Test Circuits and Waveforms
VCC OR VL DE
DI
Z
D
Y
VOD
RL/2
RL/2 VOC
VCC OR VL DE
Z
DI
D
Y
VOD
375Ω
RL = 60Ω
VCM
-7V TO +12V
375Ω
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
DI
50%
50%
3V OR VL
0V
DE
VCC OR VL
DI
SIGNAL
GENERATOR
Z
D
Y
RDIFF
CD
OUT (Z)
OUT (Y)
tDDLH
tSD1
50%
DIFF OUT (Y - Z)
90%
50%
10%
tR
tSD2
50%
VOH
VOL
tDDHL
90%
50%
10%
tF
+VOD
-VOD
tSSK = |tSD1(Y) - tSD2(Y)| OR |tSD1(Z) - tSD2(Z)| tDSK = |tDDLH - tDDHL|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
3
FN7607.1
July 28, 2011
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