 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
The question interval is too short.
Please try again in a few seconds.
Hello, Please ask a question about SP385EEA-L-TR Datasheet
# Example questions:
➢ How does the shutdown feature (on/off pin) of the sp385e conserve power, and what effect does it have on the transmitter outputs?
➢ Describe the four phases of the sp385e's charge pump and how they contribute to generating the necessary voltage levels.
➢ What are the key benefits of the sp385e compared to older 3v eia-232 transceivers, specifically regarding its charge pump design?
| Part No. | SP385EEA-L-TR |
| Manufacturer | EXAR |
| Size | 754 Kbytes |
| Pages | 16 pages |
| Description | Enhanced +3V or +5V RS-232 Line Driver/Receiver |
1. Device Overview: SP385E
️· What it is: An enhanced EIA-232/EIA-562 transceiver. It's designed as a drop-in replacement for the SP310A.
️· Purpose: Converts TTL/CMOS signals to RS-232 signals and vice versa for serial communication.
️· Key Features:
- Low Power Consumption (ideal for battery applications)
- Operates with a single +3.3V or +5V supply.
- Includes a charge pump to generate the required voltage levels.
- Shutdown feature to disable drivers/receivers and the charge pump (saving power).
- Robust protection against overvoltage and short circuits.
- Guaranteed transmission rates and monotonic output signals that adhere to RS-232 and EIA-562 standards.
️· Packages: Available in 18-pin SOIC and 20-pin SSOP packages.
2. Electrical Specifications & Performance
️· Supply Voltage: +3.3V or +5V
️· Output Voltage Swing:
- ±9V at 5V supply
- ±4.2V at 3.3V supply
- Guaranteed ±5V at 5V supply, and ±3.7V at 3.3V supply
️· Data Rate: Guaranteed 120kbps transmission rate.
️· Hysteresis Margin (Receivers): 500mV.
️· Input Thresholds (Receivers): 0.8V minimum, 2.4V maximum.
️· Slew Rate:
- Instantaneous Limited to 30V/µs (meets RS-232 standard).
- Typical Transition Region Slew Rate: 10V/µs.
️· Shutdown Control: Logic "0" on the ON/OFF pin disables drivers, receivers, and the charge pump.
3. Charge Pump Details
️· Design: Patented Exar design. Uses a four-phase voltage shifting technique.
️· Function: Generates the necessary voltage levels (+10V and -10V) from the supply voltage (+3.3V or +5V).
️· Components: Requires four external capacitors (0.1µF minimum, 16V breakdown rating).
️· Clock Rate: Typically 15kHz.
4. Protection Features
️· Driver Protection: Protected against short circuits to ground.
️· Receiver Protection: Input protection up to ±15V.
5. Theory of Operation (Simplified)
️· Drivers: Inverting transmitters that convert TTL/CMOS to RS-232.
️· Receivers: Convert RS-232 to TTL/CMOS.
️· Charge Pump: Generates the necessary voltage levels for RS-232 signals.
6. Important Notes
️· The SP385E is designed to work with existing capacitor setups (0.1µF to 10µF).
️· It is an improvement over previous designs in terms of noise and efficiency.
️· The shutdown feature is critical for power conservation in battery-powered systems.
1. Device Overview: SP385E
️· What it is: An enhanced EIA-232/EIA-562 transceiver. It's designed as a drop-in replacement for the SP310A.
️· Purpose: Converts TTL/CMOS signals to RS-232 signals and vice versa for serial communication.
️· Key Features:
- Low Power Consumption (ideal for battery applications)
- Operates with a single +3.3V or +5V supply.
- Includes a charge pump to generate the required voltage levels.
- Shutdown feature to disable drivers/receivers and the charge pump (saving power).
- Robust protection against overvoltage and short circuits.
- Guaranteed transmission rates and monotonic output signals that adhere to RS-232 and EIA-562 standards.
️· Packages: Available in 18-pin SOIC and 20-pin SSOP packages.
2. Electrical Specifications & Performance
️· Supply Voltage: +3.3V or +5V
️· Output Voltage Swing:
- ±9V at 5V supply
- ±4.2V at 3.3V supply
- Guaranteed ±5V at 5V supply, and ±3.7V at 3.3V supply
️· Data Rate: Guaranteed 120kbps transmission rate.
️· Hysteresis Margin (Receivers): 500mV.
️· Input Thresholds (Receivers): 0.8V minimum, 2.4V maximum.
️· Slew Rate:
- Instantaneous Limited to 30V/µs (meets RS-232 standard).
- Typical Transition Region Slew Rate: 10V/µs.
️· Shutdown Control: Logic "0" on the ON/OFF pin disables drivers, receivers, and the charge pump.
3. Charge Pump Details
️· Design: Patented Exar design. Uses a four-phase voltage shifting technique.
️· Function: Generates the necessary voltage levels (+10V and -10V) from the supply voltage (+3.3V or +5V).
️· Components: Requires four external capacitors (0.1µF minimum, 16V breakdown rating).
️· Clock Rate: Typically 15kHz.
4. Protection Features
️· Driver Protection: Protected against short circuits to ground.
️· Receiver Protection: Input protection up to ±15V.
5. Theory of Operation (Simplified)
️· Drivers: Inverting transmitters that convert TTL/CMOS to RS-232.
️· Receivers: Convert RS-232 to TTL/CMOS.
️· Charge Pump: Generates the necessary voltage levels for RS-232 signals.
6. Important Notes
️· The SP385E is designed to work with existing capacitor setups (0.1µF to 10µF).
️· It is an improvement over previous designs in terms of noise and efficiency.
️· The shutdown feature is critical for power conservation in battery-powered systems.
| Part No. | SP385EEA-L-TR |
| Manufacturer | EXAR |
| Size | 754 Kbytes |
| Pages | 16 pages |
| Description | Enhanced +3V or +5V RS-232 Line Driver/Receiver |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크 투 데이터시트 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Korean ▼ 
English
Chinese
German
Japanese
Russian
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand