ISL32613E Datasheet, PDF (6/11 Pages) Intersil Corporation – ±16.5kV ESD Protected, +125°C, 1.8V to 3.6V, Low Power, SOT-23, RS-485/RS-422 Transmitters

ISL32613E, ISL32614E
Test Circuits and Waveforms
V_CC ^DE
DI
Z
D
Y
V_OD
R_L/2
R_L/2 V_OC
FIGURE 2. DC DRIVER TEST CIRCUITS
DI
50%
50%
V_CC
0V
DE
V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
R_D
C_D
OUT (Z)
OUT (Y)
t_DDLH
t_SD1
50%
DIFF OUT (Y - Z)
90%
50%
10%
t_R
t_SD2
50%
V_OH
V_OL
t_DDHL
90%
50%
10%
t_F
+V_OD
-V_OD
t_SSK = |t_SD1(Y) - t_SD2(Y)| OR |t_SD1(Z) - t_SD2(Z)| t_DSK = |t_DDLH - t_DDHL|
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
SIGNAL
GENERATOR
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
DE
DI
Z
D
Y
500Ω
50pF
V_CC
SW ^GND
OUTPUT
DI
SW
Y/Z
1/0
GND
Y/Z
0/1
V_CC
Y/Z
1/0
GND
Y/Z
0/1
V_CC
DE
t_ZH
OUT (Y, Z)
t_ZL
OUT (Y, Z)
50%
50%
V_CC
0V
t_HZ
OUTPUT HIGH
50%
V_OH - 0.25V ^VOH
0V
t_LZ
50%
OUTPUT LOW
V_CC
V_OL + 0.25V _VOL
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER ENABLE AND DISABLE TIMES
6
FN7906.0
August 30, 2011