Datasheet

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TESTCIRCUIT
50 W
Generator
(seeNoteB)
FORCEOFF
ROUT
FORCEON
Auto-
powerdown
INVALID
DOUTDIN
C =30pF
L
(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
µ
s,INVALIDIsLow*
ValidRS-232Level,INVALIDHigh
* Auto-powerdowndisablesdriversandreducessupply
currentto1 A.m
VOLTAGEWAVEFORMS
3V
2.7V
-2.7V
INVALID
Output
Receiver
Input
t
valid
0V
0V
-3V
V
CC
0V
»V+
0V
»
V-
V+
V
CC
t
en
V-
50%V
CC
50%V
CC
2.7V
-2.7V
0.3V
0.3V
t
invalid
Supply
Voltages
NOTES: A.C includesprobeandjigcapacitance.
L
B. Thepulsegeneratorhasthefollowingcharacteristics:PRR=250kbit/s,Z =50 ,50%dutycycle,t 10ns,t 10ns.
O r f
W £ £
MAX3221-EP
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV ESD PROTECTION
SLLS751 – OCTOBER 2006
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 5. INVALID Propagation Delay Times and Driver Enabling Time
9
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