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TEST CIRCUIT
50 Ω
Generator
(see Note B)
FORCEOFF
ROUT
FORCEON
Auto-
powerdown
Plus
INVALID
DOUTDIN
C
L
= 30 pF
(see Note A)
2.7 V
−2.7 V
0.3 V
−0.3 V
0 V
Valid RS-232 Level, INVALID High
Indeterminate
Indeterminate
If Signal Remains Within This Region
For More Than 30 µs, INVALID Is Low
†
Valid RS-232 Level, INVALID High
†
Auto-powerdown plus disables drivers and reduces
supply current to 1 µA.
NOTES: A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following
characteristics: PRR = 5 kbit/s, Z
O
= 50 Ω, 50%
duty cycle, t
r
≤ 10 ns, t
f
≤ 10 ns.
−2.7 V
Receiver
Input
−3 V
3 V
2.7 V
t
valid
V
CC
0 V
INVALID
Output
3 V to 5 V
50%50%
0 V
0 V
0 V
50% 50%
Driver
Input
≈5.5 V
Driver
Output
≈ −5.5 V
Supply
Voltages
t
dis
t
en
t
dis
t
en
V+
V−
V+ −0.3 V
V− +0.3 V
Voltage Waveforms and Timing Diagrams
t
invalid
V+
V−
MAX3238E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV ESD (HBM) PROTECTION
SLLS710A – FEBRUARY 2006 – REVISED APRIL 2006
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 5. INVALID Propagation-Delay Times and Supply-Enabling Time
11
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