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PARAMETER MEASUREMENT INFORMATION (continued)
t
WU
V
CC
0
0
V+
V−
V
CC
0
Transmitter
Inputs
Receiver
Inputs
}
INVALID
Output
Transmitter
Outputs
V
CC
Invalid
Region
Output
t
INVH
t
WU
t
INVL
TEST CIRCUIT
50 Ω
Generator
(see Note B)
ROUT
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 disables drivers and reduces supply
current to 1 µA.
VOLTAGE WAVEFORMS
MAX3227E
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION
SLLS715A – FEBRUARY 2006 – REVISED JUNE 2007
Figure 4. INVALID Propagation Delay Times and Driver Enabling Time
9
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