 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
SP3221ECA/TR датащи(PDF) 7 Page - Sipex Corporation |
|
|
|||||||||||||||||||||||||||||
SP3221ECA/TR датащи(HTML) 7 Page - Sipex Corporation |
|
|
7 / 18 page  7 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation DESCRIPTION The SP3221E transceiver meets the EIA/ TIA-232 and ITU-T V.28/V.24 communication protocols and can be implemented in battery- powered, portable, or hand-held applications such as notebook or hand held computers. The SP3221E device features Sipex's proprietary and patented (U.S.-- 5,306,954) on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3221E device can operate at a typical data rate of 240Kbps fully loaded. The SP3221E is a 1-driver/1-receiver device is ideal for portable or hand-held applications and power sensitive designs. The device features Auto-Online circuitry which reduces the power supply drain to a 1 µA supply current. In many portable or hand-held applications, an RS-232 cable can be disconnected when not in use. Under these conditions, the internal charge pump and the driver will be shut down. Otherwise, the device automatically comes online. This feature allows design engineers to address power saving concerns without major design changes. THEORY OF OPERATION The SP3221E device is made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. Auto-Online circuitry. Drivers The driver is inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA/ TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is +5.4V with no load and +5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. This driver complies with the EIA-TIA-232F and all previous RS-232 versions. The driver typically can operate at a data rate of 250Kbps. The driver can guarantee a data rate of 250Kbps fully loaded with 3K Ω in parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. The slew rate of the driver output is internally limited to a maximum of 30V/ µs in order to meet the EIA standards (EIA RS-232D 2.1.7, Paragraph 5). The transition of the loaded output from HIGH to LOW also meets the monotonicity requirements of the standard. The SP3221E driver can maintain high data rates up to 240Kbps fully loaded. Figure 6 shows a loopback test circuit used to test the RS-232 drivers. Figure 7 shows the test results of the loopback circuit with the driver active at 250Kbps with typical RS-232 loads in parallel with 1000pF capacitors. Figure 8 shows the test results where the loaded driver was active at 235Kbps with an RS-232 receiver in parallel with a 1000pF capacitor. A solid RS-232 data transmission rate of 250Kbps provides compatibility with many designs in personal computer peripherals and LAN applications. |
|
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
