参数资料
| 型号： | MAX212EAG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 LP 24-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
MAX212
+3V-Powered, Low-Power,
True RS-232 Transceiver
6
_______________________________________________________________________________________
Operating Modes
–
S
—
D and EN determine the operation of the MAX212
as follows:
Shutdown
V+ and V- are disabled and the transmitters are put into
a high-impedance state when
–
S
—
D is taken to logic low.
Receiver operation is not affected, but power consump-
tion is dramatically reduced while in shutdown mode.
Supply current is minimized when the receiver inputs are
static in any of three states: floating (ground), less than
GND, or greater than VCC. This will be true for all static
RS-232 conditions. The presence of AC signals on receiv-
er inputs will increase VCC current in shutdown.
From a low-power system perspective, powering-up with
non-critical or unused sections of circuitry shut down or
deselected is generally recommended. Activating these
sections only when required saves power and reduces
power-up current surges. Powering-up the MAX212 in
shutdown
mode
(holding
the
shutdown
pin,
–
S
—
D, low until VCC > 2.7V), helps to achieve this.
Driving the MAX212 from 5V Logic
The MAX212 can interface with 5V logic while it operates
from a 3V supply, however a 200k
series resistor between
–
S
—
D and the +5V logic signal is required (see Figure 2).
This protects the MAX212 by preventing
–
S
—
D from sinking
current while V+ is powering up. Also, the UART must not
be permitted to send a logic high to the MAX212’s EN or
transmitter input pins until
–
S
—
D is high (not shut down).
Mouse Driveability
The MAX212 has been specifically designed to power
serial mice while operating from low-voltage power
supplies. It has been tested with samples of ten major
mouse models from six manufacturers, including the
leading three, Logitech (5 models), Mouse Systems,
and Microsoft. The MAX212 successfully drove all seri-
al mice and met their respective current and voltage
requirements (Figure 1).
Figure 3 shows the transmitter output voltages under
increasing load current. The MAX212’s switching regu-
lator ensures the transmitters will supply at least ±5V
during worst-case load conditions.
EIA/TIA-232E and 562 Standards
Most of the power drawn by RS-232 circuits is con-
sumed because the EIA/TIA-232E standard demands
that at least ±5V be delivered by the transmitters to
impedances that can be as low as 3k
. For applica-
–
S
—
D
EN
RECEIVER
OUTPUTS
DRIVER
OUTPUTS
L
High-Z
Off
Minimum
L
H
Enabled
High-Z
Off
Minimum
H
L
High-Z
Enabled
On
Normal
H
Enabled
On
Normal
SUPPLY
CURRENT
PART
No. OF
TRANSMITTERS/
RECEIVERS
DATA RATE
(kbps)
FEATURES
MAX212
3.0 to 3.6
3/5
5
250
True RS-232 from +3V
MAX560
3.0 to 3.6
4/5
2
120
2 receivers active in shutdown
MAX561
3.0 to 3.6
4/5
0
120
Pin compatible with MAX241
MAX562
2.7 to 5.25
3/5
5
250
Wide supply range
POWER-SUPPLY
VOLTAGE
(V)
No. OF
RECEIVERS
ACTIVE IN
SHUTDOWN
____________________________+3V Powered RS-232 Transceivers from Maxim
DC-DC
CONVERTER
MAX212
T_IN
SD
+3.3V
DC-DC CONVERTER
R_OUT
R_IN
TX
X3
RX
X5
EN
T_OUT
LN
LP
V-
GND
+5V
LOGIC
SIGNALS
200k
V+
Figure 2. Connecting to +5V Logic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX212EVKIT-SO | 功能描述:RS-232接口集成电路 +3V-Powered Low-Power True RS-232 Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX212EVKIT-SS0P | 制造商:Maxim Integrated Products 功能描述:- Bulk |
| MAX212EWG | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX212EWG+T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX212EWG-T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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