ISL3282EMRTEP Datasheet, PDF (3/8 Pages) Intersil Corporation – RS-485/RS-422 Receiver

ISL3282EMRTEP
Typical Operating Circuits
V_CC
LOGIC
DEVICE
(µP, ASIC,
UART)
NETWORK WITH V_L PIN FOR INTERFACE TO LOWER VOLTAGE LOGIC DEVICES
1.8V +3.3V TO 5V
64
V_L
V_CC
ISL3282EMRTEP
+
0.1µF
1 RO _R
7 _RE
A5
R_T
B8
+
0.1µF
+3.3V 2.5V
8
1
V_CC
V_L
ISL3298EMRTEP
6Y
7Z
DI 3
D
DE ²
GND
2
GND
4, 5
V_CC
LOGIC
DEVICE
(mP, ASIC,
UART)
Test Circuits and Waveforms
V_CC ^RE
GND
RE
B
RO
A
R
15pF
SIGNAL
GENERATORS
B
0V
A
+1V
0V
-1V
t_PLH
t_PHL
V_CC OR V_L
RO
50%
50%
0V
FIGURE 1A. TEST CIRCUIT
FIGURE 1B. MEASUREMENT POINTS
FIGURE 1. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
GND
B
RO
AR
1kΩ ^{VCC OR VL}
15pF
SW ^GND
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
A
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
V_CC OR V_L
GND
V_CC OR V_L
RE
1.5V
3V
1.5V
0V
t_ZH
t_HZ
OUTPUT HIGH
V_OH - 0.25V ^VOH
RO
50%
0V
t_ZL
t_LZ
V_CC OR V_L
RO
50%
OUTPUT LOW
V_OL + 0.25V _VOL
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RECEIVER ENABLE AND DISABLE TIMES
3
FN7595.1
February 15, 2011