3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4碌A(chǔ) AutoShutdown Plus and Power-On Reset
MAX3320A/B/L/T
TIMING CHARACTERISTICS
(V
CC
= 3V to 5.5V, C1鈥揅4 = 0.1碌F, C1鈥揅4 = 0.1碌F (for 3.3V 鹵10%), C1 = 0.047碌F, C2鈥揅4 = 0.33碌F (tested at 5V 鹵10%),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25擄C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Transmitter Skew
Receiver Skew
CONDITIONS
R
L
= 3k鈩? C
L
= 1000pF, one transmitter switching
R_IN to R_OUT, C
L
= 150pF
t
PHL
t
PLH
MIN
250
0.3
0.3
100
200
6
4
40
100
280
30
V/碌s
30
碌s
ms
TYP
MAX
UNITS
kbps
碌s
ns
ns
|
t
PHL
- t
PLH
|
|
t
PHL
- t
PLH
|
C
L
= 150pF to
V
CC
= 3.3V, R
L
= 3k鈩?to 7k鈩?
1000pf
measured from +3V to -3V or -3V to
C
L
= 150pF to
+3V, T
A
= +25擄C
2500pf
100mV overdrive from reset threshold
V
CC
= reset threshold
Transition-Region Slew Rate
V
CC
to
RESET
Delay
RESET
Active Timeout Period
__________________________________________Typical Operating Characteristics
(V
CC
= 3.3V, 250kbps data rate, C1鈥揅4 = 0.1碌F, all transmitters loaded with 3k鈩? Typical values are at T
A
= +25擄C, unless
otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3320 TOC01
SLEW RATE
vs. LOAD CAPACITANCE
MAX3320 TOC02
SUPPLY CURRENT
vs. LOAD CAPACITANCE WHEN
TRANSMITTING DATA
40
SUPPLY CURRENT (mA)
35
30
25
20
15
10
5
0
20kbps
120kbps
ONE TRANSMITTER AT
FULL DATA RATE INDICATED
ONE TRANSMITTER AT
1/16 DATA RATE INDICATED
250kbps
MAX3320 TOC03
7.5
V
T_OUT+
5.0
OUTPUT VOLTAGE (V)
2.5
0
-2.5
-5.0
V
T_OUT-
-7.5
0
1000
2000
3000
4000
ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3k鈩?+ C
L
12
10
SLEW RATE (V/us)
8
6
4
2
0
ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3k鈩?+ C
L
0
1000
2000
3000
4000
POSITIVE
SLEW
NEGATIVE
SLEW
45
5000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
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