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SP3220EBEA-L-TR Datasheet(PDF) 10 Page - Exar Corporation |
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SP3220EBEA-L-TR Datasheet(HTML) 10 Page - Exar Corporation |
10 / 20 page 10 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3220E_EB_EU_102_102016 (tri-stated) and the charge pump is turned off with V+ pulled down to Vcc and V- pulled to GND. The time required to exit shutdown is typically 100ms. Connect SHDN to Vcc if the shutdown mode is not used. SHDN has no effect on RxOUT. Note that the driver is enabled only when the magnitude of V- ex- ceeds approximately 3V. Receiver The receiver converts EIA/TIA-232 levels to TTL or CMOS logic output levels. The receiver has an inverting high-impedance output. This receiver output (RxOUT) is at high-impedance when the enable control EN = HIGH. In the shutdown mode, the receiver can be active or inactive. EN has no effect on TxOUT. The truth table logic of the SP3220E/EB/EU driver and receiver outputs can be found in Table 2. Table 2. SP3220E/EB/EU Truth Table Logic for Shutdown and Enable Control Figure 12. SP3220E/EB/EU Driver Loopback Test Circuit Since receiver input is usually from a trans- mission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mV. This ensures that the receiver is virtuallyimmunetonoisytransmissionlines. Should an input be left unconnected, an internal 5KΩ pull-down resistor to ground will commit the output of the receiver to a HIGH state. Figure 14. SP3220EU Loopback Test results at 1Mbps Figure 13. SP3220EB Loopback Test results at 250kbps SP3220 E/EB/EU GND TxIN TxOUT C1+ C1- C2+ C2- V+ V- VCC 0.1µF 0.1 0.1 + C2 C5 C1 + + C3 C4 + + 0.1 0.1 LOGIC INPUTS VCC 5kΩ RxIN RxOUT LOGIC OUTPUTS EN *SHDN (SP3220EU 250pF) (SP3220E/EB 1000pF) VCC µF µF µF µF SHDN EN TxOUT RxOUT 0 0 Tri-state Active 0 1 Tri-state Tri-state 1 0 Active Active 1 1 Active Tri-state DESCRIPTION |
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