ISL33334E Datasheet, PDF (10/23 Pages) Intersil Corporation – Operates from a single 3.3V supply

ISL33334E, ISL33337E
Test Circuits and Waveforms (Continued)
SIGNAL
GENERATOR
DE485
DI
Z
D
Y
C_L
500Ω
V_CC
SW ^GND
FOR SHDN TESTS, SWITCH SHDN RATHER THAN DE485
PARAMETER SHDN/DE485 OUTPUT DI
t_HZ
1/-
t_LZ
1/-
t_ZH
1/-
t_ZL
1/-
t_ZH(SHDN)
-/1
t_ZL(SHDN)
-/1
Y/Z 1/0
Y/Z 0/1
Y/Z 1/0
Y/Z 0/1
Y/Z 1/0
Y/Z 0/1
SW
GND
V_CC
GND
V_CC
GND
V_CC
C_L (pF)
15
15
100
100
100
100
DE485
(SHDN FOR SHDN)
t_ZH
t_ZH(SHDN)
OUT (Y, Z)
t_ZL
t_ZL(SHDN)
OUT (Y, Z)
ENABLED
50%
3V
50%
0V
t_HZ
OUTPUT HIGH
2.3V
V_OH - 0.5V ^VOH
0V
t_LZ
2.3V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. RS-485 DRIVER ENABLE AND DISABLE TIMES
0V ^B
A
RE485
RO
R
15pF
SIGNAL
GENERATOR
A
0V
+1.5V
0V
t_PLH
t_PHL
-1.5V
V_CC
RO
1.5V
1.5V
0V
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RS-485 RECEIVER PROPAGATION DELAY
SIGNAL
GENERATOR
RE485
B
A
RO
R
1kΩ
V_CC
SW ^GND
15pF
FOR SHDN TESTS, SWITCH SHDN RATHER THAN RE485
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
t_ZH(SHDN)
t_ZL(SHDN)
SHDN/RE485
1/-
1/-
1/-
1/-
-/0
-/0
A
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
V_CC
GND
V_CC
GND
V_CC
SHDN
(FOR SHDN TESTS)
RE485
t_ZH
t_ZH(SHDN)
RO
t_ZL
t_ZL(SHDN)
RO
3V
1.5V
0V
ENABLED
3V
1.5V
1.5V
0V
t_HZ
OUTPUT HIGH
1.5V
V_OH - 0.5V ^VOH
0V
t_LZ
1.5V
OUTPUT LOW
V_CC
V_OL + 0.5VV_OL
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RS-485 RECEIVER ENABLE AND DISABLE TIMES
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FN8776.1
October 21, 2016