MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS350B – APRIL 1999 – REVISED JANUARY 2000
PARAMETER MEASUREMENT INFORMATION
3 V
2.7 V
2.7 V
0 V
0 V
Receiver
Input
–2.7 V
–2.7 V
t
ROUT
–3 V
Generator
(see Note B)
50 Ω
t
invalid
valid
V
CC
50% V
50% V
CC
CC
0 V
INVALID
Output
t
Auto-
powerdown
en
INVALID
= 30 pF
≈V+
V+
C
L
(see Note A)
0.3 V
Supply
Voltages
V
CC
0 V
0.3 V
FORCEOFF
FORCEON
DIN
DOUT
≈V–
V–
TEST CIRCUIT
VOLTAGE WAVEFORMS
Valid RS-232 Level, INVALID High
2.7 V
0.3 V
Indeterminate
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-powerdown disables 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 Supply Enabling Time
9
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TI [ TEXAS INSTRUMENTS ]
