參數資料
型號： MAX3388ECUG+
廠商： Maxim Integrated Products
文件頁數： 8/11頁
文件大?。?/td> 0K
描述： IC TXRX RS232 250KBPS 24-TSSOP
產品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 62
類型： 收發(fā)器
驅動器/接收器數： 3/3
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 24-TSSOP
包裝： 管件
產品目錄頁面： 1407 (CN2011-ZH PDF)
MAX3388E/MAX3389E
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 (VCC) 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 VL.
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 1A 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 VCC, 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
VL
I/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
10
s/div
5V/div
2V/div
T1
T2
VCC = +2.5V
C1–C4 = 0.1
F
CL = 1000pF, RL = 3k
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
LOUT
SHDN
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
CHARGE
PUMP
SWITCH
MAX3388E
MAX3389E
L
High-Z
Inactive
Open
High-Z
LIN
H
Active
Closed
LIN
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相關代理商/技術參數
參數描述
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 數據速率: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 數據速率: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 數據速率: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 數據速率: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 2.5V Transceiver for PDAs & Cells RoHS:否 制造商:Exar 數據速率: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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