ISL3179E Datasheet, PDF (8/17 Pages) Intersil Corporation – High ESD Protected, +125°C, 40Mbps 3.3V, Full Fail-Safe, RS-485/RS-422 Transceivers

ISL3179E, ISL3180E
Test Circuits and Waveforms (Continued)
+1.5V
RE
B
A
RO
R
15pF
+3V
A
1.5V
1.5V
0V
SIGNAL
GENERATOR
t_PLH
t_PHL
V_CC
RO
1.7V
1.7V
0V
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY
SIGNAL
GENERATOR
RE
GND
B
RO
AR
1kΩ
15pF
V_CC
SW ^GND
PARAMETER
DE
A
t_HZ
0
t_LZ
0
t_ZH (Note 7)
0
t_ZL (Note 7)
0
t_ZH(SHDN) (Note 10)
0
t_ZL(SHDN) (Note 10)
0
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
FIGURE 6A. TEST CIRCUIT
SW
GND
V_CC
GND
V_CC
GND
V_CC
(NOTE 8)
RE
1.5V
3V
1.5V
0V
t_ZH, t_ZH(SHDN)
(NOTE 8)
RO
t_HZ
OUTPUT HIGH
1.5V
V_OH - 0.5V ^VOH
0V
t_ZL, t_ZL(SHDN)
(NOTE 8)
RO
t_LZ
1.5V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
8
FN6365.2
April 22, 2008