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參數(shù)資料
| 型號(hào)： | MAX3386EEUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3.0V, 【15kV ESD-Protected RS-232 Transceiver for PDAs and Cell Phones |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO20 |
| 封裝： | 4.40 MM, 0.65 MM PITCH, TSSOP-20 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 156K |
| 代理商： | MAX3386EEUP |
M
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
6
_______________________________________________________________________________________
Detailed Description
Dual Charge-Pump
Voltage Converter
The MAX3386E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), regardless of the input voltage
(V
CC
) over a +3.0V to +5.5V range. 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. Each charge pump requires a flying capacitor
(C1, C2) and a reservoir capacitor (C3, C4) to generate
the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3386E’s transmitters guarantee a 250kbps data
rate with worst-case loads of 3k
in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink). Transmitters can be paral-
leled to drive multiple receivers or mice. Figure 1 shows a
complete system connection.
These RS-232 output stages are turned off (high
impedance) when the device is in shutdown mode.
When the power is off, the MAX3386E permits the outputs
to be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or V
L
.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3386E’s receivers have inverting
three-state outputs, which depend on the shutdown
state of the device.
Shutdown Mode
Supply current falls to less than 1μA when the MAX3386E
is 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, and the transmitter
outputs are disabled (high impedance). The time
required to exit shutdown is typically 100μs, as shown in
Figure 2. Connect
SHDN
to V
CC
if the shutdown mode
is not used. In shutdown mode, the receiver outputs are
high impedance (Table 1).
MAX3386E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
SHDN
V
L
V
CC
I/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
LapLink is a trademark of Traveling Software.
50
μ
s/div
T2
T1
5V/div
2V/div
V
CC
= 3.3V
C1–C4 = 0.1
μ
F
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
TRANSMITTER
OUTPUTS
Inactive
L
High-Z
CHARGE
PUMP
Active
H
Active
Active
High-Z
SHDN
RECEIVER
OUTPUTS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3386EEUP+ | 功能描述:RS-232接口集成電路 3V 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3386EEUP+T | 功能描述:RS-232接口集成電路 3V 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3386EEUP-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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3386EIDW | 功能描述:RS-232接口集成電路 RS-232 Line Driver/Receiver 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3386EIDWG4 | 功能描述:RS-232接口集成電路 RS-232 Line Driver/Receiver 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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