ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ
ꢃ ꢆꢇ ꢈ ꢉ ꢊ ꢋꢊ ꢆꢇ ꢌꢍ ꢎꢏ ꢐ ꢑꢆꢒꢓꢁꢎ ꢎꢑꢐ ꢔꢌꢆ ꢄꢃ ꢄ ꢐ ꢍꢎꢑ ꢕꢔꢍ ꢇꢑ ꢔꢖꢔ ꢑꢒ ꢑ ꢍꢇ ꢑ ꢔ
ꢗ ꢍꢈ ꢓ ꢅ ꢊ ꢆꢘ ꢇ ꢑꢌ ꢕ ꢙꢔ ꢉ ꢈꢑ ꢒꢈ ꢍꢉ ꢎ
ꢚ
SLLS348M − JUNE 1999 − REVISED MARCH 2004
PARAMETER MEASUREMENT INFORMATION
3 V
0 V
Input
RS-232
Output
Generator
(see Note B)
50 Ω
t
t
TLH
THL
C
L
R
L
(see Note A)
V
OH
OL
3 V
3 V
−3 V
−3 V
VOLTAGE WAVEFORMS
3 V
Output
FORCEOFF
V
6 V
tTHL or tTLH
SR(tr) +
TEST CIRCUIT
NOTES: A.
C includes probe and jig capacitance.
L
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 1. Driver Slew Rate
3 V
0 V
Input
1.5 V
1.5 V
RS-232
Output
Generator
(see Note B)
50 Ω
C
t
t
PLH
L
PHL
R
L
(see Note A)
V
V
OH
3 V
FORCEOFF
50%
50%
VOLTAGE WAVEFORMS
Output
OL
TEST CIRCUIT
C includes probe and jig capacitance.
L
NOTES: A.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 2. Driver Pulse Skew
3 V or 0 V
FORCEON
3 V
−3 V
Input
1.5 V
1.5 V
Output
Generator
(see Note B)
t
t
PLH
PHL
50 Ω
C
L
(see Note A)
3 V
V
V
OH
FORCEOFF
50%
50%
Output
OL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A.
C includes probe and jig capacitance.
L
B. The pulse generator has the following characteristics: Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 3. Receiver Propagation Delay Times
7
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