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参数资料
| 型号： | MAX13223EEUP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 2TX/2RX 20-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
MAX13223E
AutoShutdown
The MAX13223E achieves 1A supply current with
Maxim’s AutoShutdown feature, which operates when
FORCEON is low and FORCEOFF is high. When the
device senses no valid signal levels on both receiver
inputs for > 30s (typ), the onboard charge pump and
drivers are shut off, reducing supply current to 1A.
This occurs if the RS-232 cable is disconnected or the
connected peripheral transmitters are turned off. The
device turns on again when a valid level is applied to
either RS-232 receiver input. As a result, the system
saves power. Table 2 summarizes the MAX13223E’s
operating modes. FORCEON and FORCEOFF override
AutoShutdown. When neither control is asserted, the IC
selects between these states automatically, based on
receiver input levels. Figure 6a shows the input levels
and Figure 6b shows the timing diagram for
AutoShutdown operation.
Software-Controlled Shutdown
If direct software control is desired, INVALID can be
used to indicate a DTR or Ring indicator signal.
Connect FORCEOFF and FORCEON together to bypass
AutoShutdown; therefore, the line acts as a SHDN input.
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
8
_______________________________________________________________________________________
MAX13223E
UART
FORCEON
FORCEOFF
POWER-
MANAGEMENT
UNIT OR CPU
INVALID
RS-232
Figure 5. Interface Under Control of PMU
Table 1. Receiver Control Truth Table
EN
OPERATION MODE
R_OUT
0
Active (FORCEON), or
Active (AutoShutdown)
Active
0
Shutdown (
FORCEOFF), or
Shutdown (AutoShutdown)
Active and
asserted low
1
Shutdown status is don’t care
High impedance
RECEIVER
INPUT
AutoShutdown, TRANSMITTER DISABLED,
1
μA SUPPLY CURRENT
-2.7V
b)
a)
-0.3V
+2.7V
+0.3V
0
INDETERMINATE
TRANSMITTER ENABLED, INVALID HIGH
tINVL
tINVH
tWU
V+
V-
0
+2.7V
+0.3V
-0.3V
-2.7V
0
VCC
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
INVALID
REGION
Figures 6a and 6b. Trip Levels for Entering and Exiting
AutoShutdown
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