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參數(shù)資料
| 型號： | MAX3388E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual LVDS Receiver 8-MSOP -40 to 85 |
| 中文描述： | 2.5V、±15kV ESD保護、RS-232收發(fā)器，用于PDA和蜂窩電話 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 276K |
| 代理商： | MAX3388E |
M
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
6
_______________________________________________________________________________________
Detailed Description
Dual Charge-Pump
Voltage Converter
The MAX3388E/MAX3389E
’
s internal power supply
consists of a regulated dual charge pump that provides
output voltages of +4.2V (doubling charge pump) and -
4.2V (inverting charge pump), regardless of the input
voltage (V
CC
) over a +2.5V to +3.0V range. The charge
pumps operate in a discontinuous mode: if the output
voltages are less than 4.2V, the charge pumps are
enabled; if the output voltages exceed 4.2V, the charge
pumps are disabled. Each charge pump requires flying
capacitors (C1, C2) and reservoir capacitors (C3, C4)
to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
CMOS-logic levels to ±3.7V EIA/TIA-232-compatible
levels.
The MAX3388E/MAX3389E
’
s transmitters guarantee a
250kbps data rate with loads of 3k
in parallel with
1000pF and 460kbps data rate with loads of 3k
in paral-
lel with 150pF. Figure 1 shows a complete system con-
nection.
These RS-232 output stages are turned off (high
impedance) when the devices are in shutdown mode.
When the power is off, the MAX3388E/MAX3389E permit
the outputs to be driven up to ±12V.
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or V
L
.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3388E/MAX3389E
’
s receivers
have inverting outputs. The outputs are high imped-
ance in shutdown.
Shutdown Mode
Supply current falls to less than 1μA when the
MAX3388E/MAX3389E are placed in shutdown mode
(
SHDN
logic low). When shut down, the device
’
s charge
pumps are turned off, V+ decays to V
CC
, V- is pulled to
ground, the switch is opened, and the transmitter outputs
are disabled (high impedance). The time required to exit
MAX3388E
MAX3389E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
SHDN
V
L
I/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
10
μ
s/div
5V/div
2V/div
T1
T2
V
CC
= +2.5V
C1–C4 = 0.1
μ
F
C
L
= 1000pF, R
L
= 3k
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
LOUT
SHDN
T R AN SM T T ER
O U TPU T S
High-Z
Active
RECEIVER
OUTPUTS
High-Z
Active
CH ARG E
PU M P
Inactive
Active
SWIT C H
MAX3388E
High-Z
MAX3389E
LIN
LIN
L
H
Open
Closed
LIN
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參數(shù)描述 |
|---|---|
| MAX3388ECUG | 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: |
| MAX3388ECUG+ | 功能描述:RS-232接口集成電路 2.5V Transceiver for PDAs & Cells 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: |
| MAX3388ECUG+T | 功能描述:RS-232接口集成電路 2.5V Transceiver for PDAs & Cells 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: |
| MAX3388ECUG-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: |
| MAX3388EEUG | 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: |
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