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參數(shù)資料
| 型號(hào)： | MAX3189EUT-T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TX RS232 1MBPS 1UA SOT23-6 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 發(fā)射器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/0 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-6 |
| 包裝： | 帶卷 (TR) |
Detailed Description
The transmitter is an inverting level translator that
converts CMOS-logic levels to 5V EIA/TIA-232 levels.
The MAX3188 guarantees a 250kbps data rate, and the
MAX3189 guarantees a 1Mbps data rate with worst-case
loads of 3k
in parallel with 1000pF. The transmitter
input does not have a pull-up resistor and should be
connected to GND if unused.
Shutdown
The MAX3188/MAX3189 feature a shutdown input.
Drive SHDN low to reduce the supply current to 1A
(max). Shutdown also forces TOUT into a high-
impedance state that allows the signal line to be safely
controlled by other transmitters. Drive SHDN high for
normal operation.
Power-Supply Decoupling
In most circumstances, 0.1F bypass capacitors are
adequate for power-supply decoupling. Connect the
bypass capacitors as close to the IC as possible.
Applications Information
Power-Supply Sources
The MAX3188/MAX3189 require ±4.5V to ±6V dual
supplies. For applications where these supply voltages
are not present, a DC-DC converter must be added.
Due to the devices’ low current consumption, a charge
pump can provide the proper supply voltages and
requires a minimal amount of board space and cost.
When using another RS-232 device containing an internal
regulated charge pump (Table 1), the MAX3188/
MAX3189 may be powered from the internal charge
pump (Figure 2). This eliminates the need for additional
external DC-DC converters to generate the required
±4.5V to ±6V dual supplies.
MAX3188/MAX3189
1Mbps, 1A RS-232 Transmitters in SOT23-6
4
_______________________________________________________________________________________
Pin Description
Negative Supply Voltage
VEE
5
Positive Supply Voltage
VCC
6
RS-232 Transmitter Output
TOUT
4
TTL/CMOS Transmitter Input
TIN
3
PIN
Ground
GND
2
Active-Low Shutdown. Pull low to reduce the supply current and to force TOUT into a high-impedance state.
SHDN
1
FUNCTION
NAME
50%
tPLH
tPHL
+5V
-5V
TOUT
TIN
VIH
VIL
Figure 1. Transmitter Propagation-Delay Timing
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