Electronic Components Datasheet Search |
|
SP3232EBCA-L Datasheet(PDF) 8 Page - Exar Corporation |
|
SP3232EBCA-L Datasheet(HTML) 8 Page - Exar Corporation |
8 / 24 page The SP3222EB/SP3232EB transceivers meet the EIA/TIA-232 and ITU-T V.28/V.24 communication protocols and can be imple- mented in battery-powered, portable, or hand-held applications such as notebook or palmtop computers. The SP3222EB/ SP3232EB devices feature Exar's propri- etary on-board charge pump circuitry that generates ±5.5V for RS-232 voltage levels from a single +3.0V to +5.5V power supply. This series is ideal for +3.3V-only systems, mixed +3.3V to +5.5V systems, or +5.0V-only systems that require true RS-232 perfor- mance. The SP3222EB/SP3232EB devices can operate at a data rate of 250kbps when fully loaded. The SP3222EB and SP3232EB are 2- driver/2- receiver devices ideal for portable or hand-held applications. The SP3222EB features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply current. THEORY OF OPERATION The SP3222EB/SP3232EB series is made up of three basic circuit blocks: 1. Drivers 2. Receivers 3. The Exar proprietary charge pump Drivers The drivers are 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 with- out degradation in reliability. Driver outputs will meet EIA/TIA-562 levels of +/-3.7V with supply voltages as low as 2.7V. The drivers can guarantee a data rate of 250kbps fully loaded with 3kΩ in parallel with 1000pF, ensuring compatability with PC-to-PC communication software. The slew rate of the driver is internally limited to a maximum of 30V/µs in order to meet the EIA standards (EIA RS-232D 2.1.7, Para- graph 5). The transition of the loaded output from HIGH to LOW also meet the monotonic- ity requirements of the standard. Figure 10 shows a loopback test circuit used to test the RS-232 Drivers. Figure 11 shows the test results of the loopback circuit with all drivers active at 120kbps with RS-232 loads in parallel with a 1000pF capacitor. Figure 12 shows the test results where one driver was active at 250kbps and all drivers loaded with an RS-232 receiver in parallel with 1000pF capacitors. A solid RS-232 data transmis- sion rate of 250kbps provides compatibility with many designs in personal computer peripherals and LAN applications. The SP3222EB driver's output stages are turned off (tri-state) when the device is in shutdown mode. When the power is off, the SP3222EB device permits the outputs to be driven up to +/-12V. The driver's inputs do not have pull-up resistors. Designers should connect unused inputs to Vcc or GND. In the shutdown mode, the supply current falls to less than 1µA, where SHDN = LOW. When the SP3222EB device is shut down, the device's driver outputs are disabled (tri- stated) and the charge pumps are turned off with V+ pulled down to Vcc and V- pulled to GND. The time required to exit shutdown is typically 100µs. Connect SHDN to Vcc if the shutdown mode is not used. DESCRIPTION 8 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000 • www.exar.com SP3222EB/SP3232EB_106_022316 |
Similar Part No. - SP3232EBCA-L |
|
Similar Description - SP3232EBCA-L |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |