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參數(shù)資料
| 型號： | MAX3381ECUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO20 |
| 封裝： | 4.40 MM, 0.65 MM PITCH, TSSOP-20 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 257K |
| 代理商： | MAX3381ECUP |
M
+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
2
3
4
5
6
C1+
V+
C1-
C2+
C2-
V-
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V/+4.0V Generated by the Charge Pump
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-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
TTL/CMOS Transmitter Inputs Referenced to V
L
(T1IN, T2IN)
TTL/CMOS Receiver Outputs Referenced to V
L
(R2OUT, R1OUT)
Force-On Input. Drive high to override automatic circuitry keeping transmitters on
(
FORCEOFF
must be high) (Table 1).
—
8, 9
10, 11
T_IN
R_OUT
12
FORCEON
13
V
L
Logic Level Supply. +1.65V to +5.5V, sets CMOS logic thresholds and CMOS
outputs.
—
14, 15
16, 17
18
R_IN
T_OUT
GND
RS-232 Receiver Inputs (R2IN, R1IN)
RS-232 Transmitter Outputs (T2OUT, T1OUT)
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3381EEUP | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
| MAX3380EEUP | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
| MAX3380E | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
| MAX3380E-MAX3381E | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
| MAX3380ECUP | +2.35V to +5.5V, 1レA, 2Tx/2Rx RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3381ECUP+ | 功能描述:RS-232接口集成電路 2.35-5.5V 1uA 2Tx/Rx 460Kbps Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3381ECUP+T | 功能描述:RS-232接口集成電路 2.35-5.5V 1uA 2Tx/Rx 460Kbps Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3381ECUP-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3381EEUP | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3381EEUP+ | 功能描述:RS-232接口集成電路 2.35-5.5V 1uA 2Tx/Rx 460Kbps Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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