@Interface IC Data :Units ^Units of Measurement I Current, measured in Amperes or Amps, abbreviated A. 1 Amp is equal to the current flowing through 1 ohm of resistance when 1 volt is applied across that resistance mA Milliamp, equal to 0.001A uA Microamp, equal to 0.0000001A V Voltage, measured in Volts, abbreviated V. mV Millivolt, equal to 0.001V us Microsecond, equal to one millionth of a second ns Nanosecond, equal to one billionth (10 exponent -9) second :1488:RS232 Driver, Quad ^1488 Quad RS232 Line Driver ___________ 1________ V- |o \_/ | V+ _____| \ []1 14[] inA1 | 1488 \ 3 | | | DRIVER )O----- inA1 []2 13[] inB4 _____| / outY1 | | | | inB1 |_______/ <---outY1 []3 12[] inA4 2 | 1488 | | inA2 []4 11[] outY4---> _________________ | | | | inputs | out | inB2 []5 10[] inB3 |---------|-----| | | | | | A | B | Y | <---outY2 []6 9[] inA3 |----|----|-----| | | | | L | L | +9v | []7 8[] outY3---> | L | H | +9v | (typ. no load Gnd|___________| | H | L | +9v | output @V+=12v | H | H | -9v | and V- = -12v) |---------------| The 1488 is a quad line driver which converts TTL input logic levels through one level of inversion to output levels meeting EIA-232 and CCITT Recommendation V.24. ABSOLUTE MAXIMUM RATINGS V+ +/-15v V- -15v Vin Input Voltage -15v < Vin < 7.0v Output voltage +/-15v Operating Temp range 0 - 75 degrees celsius Storage Temp range -65 - 150 degrees celsius Max Power Diss @25C 1364 mW (Cavity package) Max Power Diss @25C 1280 mW (Moulded DIP package) Max Power Diss @25C 974 mW (SO package) Derate above 25C 9.1 mw (Cavity package) Derate above 25C 10.2 mw (Moulded DIP package) Derate above 25C 7.8 mw (SO package) ELECTRICAL CHARACTERISTICS Conditions Min Typ Max Iil Lo level in Vin=0v -1.0 -1.3 mA Iih Hi level in Vin=5v 0.0005 10.0 uA Voh Hi level output @V+= 9.0v,V- = - 9.0v 6.0 7.0 V Voh Hi level output @V+=13.2v,V- = - 13.2v 9.0 10.5 V Vol Hi level output @V+= 9.0v,V- = - 9.0v -6.0 -6.8 V Vol Hi level output @V+=13.2v,V- = - 13.2v -9.0 -10.5 V Ios+ Hi level short cct Vout=0v -6.0 -10.0 -12.0 mA Ios- Lo level short cct Vout=0v 6.0 10.0 12.0 mA Rout Output resistance V+ = V- = 0v, Vout=+/-2v 300 ohms Iccl Positive supply @V+= 9.0v,V- = - 9.0v 15.0 20.0 mA Iccl Positive supply @V+=12.0v,V- = - 12.0v 19.0 25.0 mA Iccl Positive supply @V+=15.0v,V- = - 15.0v 25.0 34.0 mA Icch Positive supply @V+= 9.0v,V- = - 9.0v 4.5 6.0 mA Icch Positive supply @V+=12.0v,V- = - 12.0v 5.5 7.0 mA Icch Positive supply @V+=15.0v,V- = - 15.0v 8.0 12.0 mA Iccl Negative supply @V+= 9.0v,V- = - 9.0v -13.0 -17.0 mA Iccl Negative supply @V+=12.0v,V- = - 12.0v -18.0 -23.0 mA Iccl Negative supply @V+=15.0v,V- = - 15.0v -25.0 -34.0 mA Icch Negative supply @V+= 9.0v,V- = - 9.0v -0.001 -0.015 mA Icch Negative supply @V+=12.0v,V- = - 12.0v -0.001 -0.015 mA Icch Negative supply @V+=15.0v,V- = - 15.0v -0.01 -2.5 mA SWITCHING CHARACTERISTICS Conditions Min Typ Max tpd1 Prop delay to 1 Rl=3k, Cl=15pf, Ta=25C 230 350 ns tpd0 Prop delay to 0 Rl=3k, Cl=15pf, Ta=25C 70 175 ns tr Rise time Rl=3k, Cl=15pf, Ta=25C 75 100 ns tf Fall time Rl=3k, Cl=15pf, Ta=25C 40 75 ns :1489:RS232 Receiver, Quad ^1489 Quad RS232 Line Receiver ___________ |o \_/ |Vcc |\ 1489 in1 []1 14[] inA1 | \ | | | -----| >O----- Resp1 []2 13[] in4 | / outY1 | | | | |/ | <----out1 []3 12[] Resp4 | | 1489/ | | ResponseControl in2 []4 1489A 11[] out4---> _______________ | | | | input | out | Resp2 []5 10[] in3 |-------|-----| | | | | | inX | Y | <----out2 []6 9[] Resp3 |-------|-----| | | | | +9v | L | []7 8[] out3---> | -9v | H | Gnd|___________| | +3v | L | | 0v | H | |-------------| The 1489 is a quad line receiver which converts RS232 input level signals through one level of inversion to TTL output levels. The 1489 devices have a 'fail safe' operating mode, in that a disconnected input should give a mark output - the correct idle level for a NRZ UART TTL input. The response control pin is the base of the first input transistor in the device, and is made available so that a capacitor may be added for noise filtering (typical values of perhaps 100-220pf). The 1489 has a small level of input hysterisys. The 1489A has an increased level of input hysterisys. Unterminated cables connected to a 1489 will often cause spurious device output, even with the 'fail safe' mode and the response control capacitors. The pickup from an unterminated cable is such that any reasonably high impedance receiver (such as a 1489) can never be entirely 'clean'. With a powered driver on the cable, spurious output generally reduces dramatically. Spurious spikes can also be induced in 1489 outputs when unterminated input tracks are run close to RS232 output tracks, and response control capacitors are not used. This can be troublesome on some UARTs which interrupt the microprocessor each time a change in modem line status is seen. ABSOLUTE MAXIMUM RATINGS Power Supply voltage 10v Input voltage range +/-30v Output Load current 20ma Operating Temp range 0 - 75 degrees celsius Storage Temp range -65 - 150 degrees celsius ELECTRICAL CHARACTERISTICS Conditions Min Typ Max Vth Input high threshold Iout=10ma, 1489, 25C 1.0 1.25 1.5 V Vth Input high threshold Iout=10ma, 1489 0.9 1.6 V Vth Input high threshold Iout=10ma, 1489A, 25C 1.75 2.00 2.25 V Vth Input high threshold Iout=10ma, 1489A 1.55 2.40 V Vtl Input low threshold Iout=-0.5ma, 25C 0.75 1.00 1.25 V Vtl Input low threshold Iout=-0.5ma, 0.65 1.35 V Iin Input current Vin=+25v +3.6 +5.6 +8.3 ma Iin Input current Vin=-25v -3.6 -5.6 ma Iin Input current Vin=+3v +0.43 +0.53 +8.3 ma Iin Input current Vin=-3v -0.43 -0.53 ma Voh Hi level output Iout=-0.5ma,Vin=0.75v 2.6 3.8 5.0 V Voh Hi level output Iout=-0.5ma, In open 2.6 3.8 5.0 V Vol Low level output Iout=10ma, Vin=3.0v 0.33 0.45 V Icc Supply current Vin=5v 14 26 ma SWITCHING CHARACTERISTICS (Ta=25 degrees C, Vcc=5v) Conditions Min Typ Max tpd1 Prop delay to 1 Rl=3.9k, Cl=15pf 28 85 ns tpd0 Prop delay to 0 Rl=390 ohms, Cl=15pf 20 50 ns tr Rise time Rl=3.9k, Cl=15pf 110 175 ns tf Fall time Rl=390ohms, Cl=15pf 9 20 ns :75176:RS485/RS422 Transceiver ^75176 RS485/RS422 Transceiver ___________ ________ 6 |o \_/ | V+ | \__________ <--- RxD []1 8[] TxD 4 | RS485 \ | com+ | | | ------| Driver ) | RxEn []2 7[] COM- | /O___|____ | | 75176 | 3 |_______/ | | com- TxEn []3 6[] COM+ __________| | | | | | TxEn ________ | | TxD []4 5[] / |____| | |___________|Gnd RxD 1 / RS485 | | -----( Receiver| | ...
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