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MAX3380EEUP+T

P1-P3P4-P6P7-P9P10-P12P13-P14
-6
-2
-4
2
0
6
4
8
0 1000 1500500 2000 2500 3000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3380E toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
V
CC
= +4.2V
-6
-2
-4
2
0
6
4
8
0 1000 1500500 2000 2500 3000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3380E toc02
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
V
CC
= +2.5V
0
5
10
15
20
25
30
35
40
0 1000500 1500 2000 2500 3000
MAX3380E
SLEW RATE vs. LOAD CAPACITANCE
MAX3380E toc03
LOAD CAPACITANCE (pF)
SLEW RATE (V/μs)
V
CC
= +4.2V
V
CC
= +2.5V
Typical Operating Characteristics
(V
CC
= V
L
= +4.2V, C1 = 0.22µF, C2 = C3 = C4 = 1µF, C5 = 0.1µF parallel with 47µF, R
L
= 3kΩ, C
L
= 1000pF, data rate is 250kbps,
T
A
= +25°C, unless otherwise noted.)
MAX3380E/MAX3381E
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS
(V
CC
= +2.35V to +5.5V, V
L
= +1.65V to +5.5V. When V
CC
< +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when V
CC
≥ +4.5V, C1 = 0.047µF,
C2 = C3 = C4 = 0.33µF; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS MIN
TYP MAX
UNITS
MAX3381E 250
Maximum Data Rate
R
L
= 3kΩ, C
L
= 1000pF, one
transmitter switching
MAX3380E 460
kbps
t
PLH
0.15
Receiver Propagation Delay
t
PHL
Receiver input to receiver output, C
L
= 100pF
0.15
µs
Transmitter Skew
⏐t
PHL
- t
PLH
⏐
(Note 2)
200
ns
Receiver Skew
⏐t
PHL
- t
PLH
⏐
50 ns
Transition Region Slew Rate
(MAX3380E)
V
CC
= +4.2V, -3.0V < T_OUT< +3.0V,
R
L
= 3kΩ, C
L
= 250pF to 1000pF, T
A
= +25°C
20
100
V/µs
Transition Region Slew Rate
(MAX3381E)
V
CC
= +4.2V, -3.0V < T_OUT< +3.0V,
R
L
= 3kΩ, C
L
= 150pF to 1000pF, T
A
= +25°C
630
V/µs
Transition Region Slew Rate
(MAX3380E)
V
CC
= +2.35V, -3.0V < T_OUT< +3.0V,
R
L
= 3kΩ, C
L
= 250pF to 1000pF, T
A
= +25°C
30
V/µs
Transition Region Slew Rate
(MAX3381E)
V
CC
= +2.35V, -3.0V < T_OUT< +3.0V,
R
L
= 3kΩ, C
L
= 250pF to 1000pF, T
A
= +25°C
10
V/µs
Note 2: Transmitter skew is measured at the transmitter zero crosspoint.
MAX3380E/MAX3381E
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
_______________________________________________________________________________________ 5
6
7
8
9
10
11
12
13
14
0 1000500 1500 2000 2500 3000
MAX3381E
SLEW RATE vs. LOAD CAPACITANCE
MAX3380E toc04
LOAD CAPACITANCE (pF)
SLEW RATE (V/μs)
V
CC
= +4.2V
V
CC
= +2.5V
0
10
20
30
40
50
60
70
80
0 1000500 1500 2000 2500 3000
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
MAX3381E toc05
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
460kbps
250kbps
20kbps
1 TRANSMITTER SWITCHING
-6
-2
-4
2
0
6
4
8
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (V
CC
FALLING)
MAX3380E toc06
SUPPLY VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE (V)
2.5 3.5 4.5 5.5
V
OUT+
V
OUT-
-6
-2
-4
2
0
6
4
8
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (V
CC
RISING)
MAX3380E toc07
SUPPLY VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE (V)
2.5 3.5 4.5 5.5
V
OUT+
V
OUT-
0
5
10
15
20
25
2.5 3.5 4.5 5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (V
CC
FALLING)
MAX3380E toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
1 TRANSMITTER SWITCHING
1μs/div
T_IN
5V/div
T_OUT
5V/div
MAX3380E toc09
MAX3380E
DATASTREAM V
CC
= +4.2V
5V
0
5V
0
-5V
V
CC
= V
L
=
+2.5V
1μs/div
T_IN
5V/div
T_OUT
5V/div
MAX3380E toc10
MAX3380E
DATASTREAM V
CC
= +2.5V
5V
0
5V
0
-5V
Typical Operating Characteristics (continued)
(V
CC
= V
L
= +4.2V, C1 = 0.22µF, C2 = C3 = C4 = 1µF, C5 = 0.1µF parallel with 47µF, R
L
= 3kΩ, C
L
= 1000pF, data rate is 250kbps,
T
A
= +25°C, unless otherwise noted.)
MAX3380E/MAX3381E
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
6 _______________________________________________________________________________________
Detailed Description
The MAX3380E/MAX3381E are RS-232 transceivers that
maximize battery life by reducing current consumption
at low battery levels. When the supply voltage is above
+3.7V, the RS-232 outputs are at ±5.5V, which is com-
pliant with the RS-232 standard. As the supply voltage
drops below the +3.1V set point, the RS-232 outputs
change to ±3.7V, which is compatible with the RS-232
standard. The outputs will remain at the compatible lev-
els until the supply voltage rises above +3.5V, where
they return to compliant levels. 400mV of hysteresis pro-
tects against power-supply bounce that may cause
numerous mode changes.
Most devices that use charge pumps to double and
invert voltages consume higher current when the supply
voltage is less than half of the required output voltage.
This is due to the fact that the charge pump is constant-
ly operating because the output voltage is below the
regulation voltage. This requires more supply current
because the output will never reach the regulation volt-
age and switch off. The MAX3380E/MAX3381E reduce
the output voltage requirement allowing the charge
pump to operate with supply voltages down to +2.35V.
Dual-Mode Regulated Charge-Pump
Voltage Converter
The MAX3380E/MAX3381Es’ internal power supply is a
dual-mode regulated charge pump. The output regula-
tion point depends on V
CC
and the direction in which
V
CC
moves through the switchover region of +2.95V <
V
CC
< +3.7V.
For supply voltages above +3.7V, the charge pump will
generate +5.5V at V+ and -5.5V at V-. The charge
pumps operate in a discontinuous mode. If the output
voltages are less than ±5.5V, the charge pumps are
enabled; if the output voltages exceed ±5.5V, the
charge pumps are disabled.
For supply voltages below +2.95V, the charge pump
will generate +4.0V at V+ and -4.0V at V-. The charge
pumps operate in a discontinuous mode.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies (see Typical Operating Circuit).
Pin Description
PIN NAME FUNCTION
ESD
PROTECTED
1 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor —
2 V+ +5.5V/+4.0V Generated by the Charge Pump —
3 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor —
4 C2+ Positive Terminal of Inverting Charge-Pump Capacitor —
5 C2- Negative Terminal of Inverting Charge-Pump Capacitor —
6 V- -5.5V/-4.0V Generated by the Charge Pump —
7
INVALID
INVALID is asserted if any inputs of the receivers are in an invalid state;
-0.3V < V
R
_
IN
< +0.3V
—
8, 9 T_IN TTL/CMOS Transmitter Inputs Referenced to V
L
(T1IN, T2IN) ✔
10, 11
R_OUT
TTL/CMOS Receiver Outputs Referenced to V
L
(R2OUT, R1OUT) ✔
12
FORCEON
Force-On Input. Drive high to override automatic circuitry keeping transmitters on
(FORCEOFF must be high) (Table 1).
✔
13 V
L
Logic Level Supply. +1.65V to +5.5V, sets CMOS logic thresholds and CMOS
outputs.
—
14, 15
R_IN RS-232 Receiver Inputs (R2IN, R1IN) ✔
16, 17
T_OUT RS-232 Transmitter Outputs (T2OUT, T1OUT) ✔
18 GND Ground —
19
FORCEOFF
Force-Off Input. Drive low to shut down transmitters and on-board power supply.
This overrides all automatic circuitry and FORCEON (Table 1).
✔
—
20 V
CC
+2.35V to +5.5V Supply Voltage
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX3380EEUP+T

Mfr. #:
Buy MAX3380EEUP+T
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 2.35-5.5V 1uA 2Tx/Rx 460Kbps Transceiver
Lifecycle:
New from this manufacturer.
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