MAX3221E
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH 15-kV IEC ESD PROTECTION
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SLLS686A–OCTOBER 2005–REVISED MAY 2006
PARAMETER MEASUREMENT INFORMATION
3 V
2.7 V
2.7 V
0 V
0 V
EN = GND
Receiver
Input
ROUT
−2.7 V
−2.7 V
−3 V
Generator
(see Note B)
50 Ω
t
t
valid
invalid
V
CC
50% V
t
50% V
CC
CC
INVALID
Output
0 V
Auto-
powerdown
INVALID
en
C = 30 pF
L
(see Note A)
≈V+
V+
0.3 V
V
CC
Supply
FORCEOFF
FORCEON
0 V
0.3 V
Voltages
DIN
DOUT
≈V−
V−
TEST CIRCUIT
VOLTAGE WAVEFORMS
Valid RS-232 Level, INVALID High
Indeterminate
2.7 V
0.3 V
If Signal Remains Within This Region
For More Than 30 µs, INVALID Is Low
0 V
†
−0.3 V
Indeterminate
−2.7 V
Valid RS-232 Level, INVALID High
†
Auto-powerdowndisables drivers and reduces supply
current to 1 µA.
NOTES: A. C includes probe and jig capacitance.
L
B. The pulse generator has the following characteristics: PRR = 5 kbit/s, Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 5. INVALID Propagation Delay Times and Driver Enabling Time
9
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