DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver General Description Features The DS14C238 is a four driver, four receiver device which conforms to the TIA/EIA-232-E standard and CCITT V.28 recommendations. This device eliminates ± 12V supplies by employing an internal DC-DC converter to generate the necessary output levels from a single +5V supply. Driver slew rate control and receiver noise filtering have also been internalized to eliminate the need for external slew rate control and noise filtering capacitors. n n n n n n n n Connection Diagram Functional Diagram Conforms to TIA/EIA-232-E and CCITT V.28 Internal DC-DC converter Operates with single +5V supply Low power requirement — ICC 10 mA max Internal driver slew rate control Receiver noise filtering Operates above 120 kbits/sec Direct replacement for MAX238 01128201 Order Number DS14C238WM, DS14C238WMX See NS Package Number M24B 01128202 © 2002 National Semiconductor Corporation DS011282 www.national.com DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver July 2002 DS14C238 Absolute Maximum Ratings Storage Temp. Range (Note 1) Lead Temp. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) (VCC −0.3V) to +15V V− Pin +0.3V to −15V Driver Input Voltage Recommended Operating Conditions ± 30V Supply Voltage, VCC −0.3V to (VCC +0.3V) Junction Temperature Min Max Units 4.5 5.5 V +70 ˚C Operating Free Air Temp. (TA) +150˚C DS14C238 Maximum Package Power Dissipation @ +25˚C (Note 6) WM Package ≥ 2.0 kV (HBM, 1.5 kΩ, 100 pF) (V+ +0.3V) to (V− −0.3V) Receiver Input Voltage +260˚C Continuous ESD Rating −0.3V to (VCC +0.3V) Driver Output Voltage Receiver Output Voltage (Soldering, 4 Seconds) Short Circuit Duration (DOUT) −0.3V to +6V V+ Pin −65˚C to +150˚C 0 1400 mW Electrical Characteristics (Note 2) Over recommended operating conditions, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DEVICE CHARACTERISTICS V+ Positive Power Supply RL = 3 kΩ, C1–C4 = 1.0 µF, DIN = 0.8V 9.0 V− Negative Power Supply RL = 3 kΩ, C1–C4 = 1.0 µF, DIN = 2.0V −8.0 ICC Supply Current (VCC) No Load 7.0 V V 10 mA VCC V DRIVER CHARACTERISTICS VIH High Level Input Voltage VIL Low Level Input Voltage GND 0.8 V IIH High Level Input Current VIN ≥ 2.0V −10 +10 µA IIL Low Level Input Current VIN ≤ 0.8V −10 +10 µA VOH High Level Output Voltage RL = 3 kΩ 5.0 VOL Low Level Output Voltage −6.3 −5.0 V −30 −15 −5.0 mA VO = 0V, VIN = 2.0V 5.0 12 30 mA −2V ≤ VO ≤ +2V, VCC = GND = 0V 300 IOS+ Output High Short 2.0 VO = 0V, VIN = 0.8V (Note 3) 7.4 V Circuit Current IOS− Output Low Short Circuit Current RO Output Resistance Ω RECEIVER CHARACTERISTICS VTH Input High Threshold Voltage VTL Input Low Threshold Voltage 0.8 1.5 VHY Hysteresis 0.2 0.4 1.0 RIN Input Resistance IIN Input Current 1.9 V V V 3.0 4.5 7.0 kΩ VIN = +15V 2.14 3.8 5.0 mA VIN = +3V 0.43 0.6 +1.0 mA VIN = −3V −1.0 −0.6 −0.43 mA VIN = −15V −5.0 −3.8 −2.14 mA 4.5 VOH High Level Output Voltage VIN = −3V, IO = −3.2 mA 3.5 VIN = −3V, IO = −20 µA 4.0 VOL Low Level Output Voltage VIN = +3V, IO = +2.0 mA www.national.com 2.4 2 V 4.9 0.25 V 0.4 V Over recommended operating conditions, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DRIVER CHARACTERISTICS tPLH Propagation Delay LOW to HIGH RL = 3 kΩ 0.7 4.0 µs tPHL Propagation Delay HIGH to LOW CL = 50 pF 0.6 4.0 µs tsk Skew |tPLH–tPHL | (Figures 1, 2) 0.1 1.0 µs SR1 Output Slew Rate RL = 3kΩ to 7 kΩ, CL = 50 pF 4.0 15 30 V/µs SR2 Output Slew Rate RL = 3 kΩ, CL = 2500 pF 3.0 5.0 V/µs RECEIVER CHARACTERISTICS tPLH Propagation Delay LOW to HIGH Input Pulse Width > 10 µs 2.0 6.5 µs tPHL Propagation Delay HIGH to LOW CL = 50 pF 2.8 6.5 µs tSK Skew | tPLH–tPHL | (Figures 3, 4) 0.8 2.0 µs tNW Noise Pulse Width Rejected (Figures 3, 4) 2.5 1.0 µs Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 3: IOS+ and IOS− values are for one output at a time. If more than one output is shorted simultaneously, the device power dissipation may be exceeded. Note 4: Receiver AC input waveform for test purposes: tr = tf = 200 ns, VIH = 3V, VIL = −3V, f = 64 kHz (128 kbits/sec). Driver AC input waveform for test purposes: tr = tf ≤ 10 ns, VIH = 3V, VIL = 0V, f = 64 kHz (128 kbits/sec). Note 5: All typicals are given for VCC = 5.0V and TA = +25˚C. Note 6: Ratings apply to ambient temperature at +25˚C. Above this temperature derate: WM package 13.5 mW/˚C. Parameter Measurement Information 01128204 FIGURE 1. Driver Load Circuit 01128205 FIGURE 2. Driver Switching Waveform 01128206 FIGURE 3. Receiver Load Circuit 3 www.national.com DS14C238 Switching Characteristics (Note 4) DS14C238 Parameter Measurement Information (Continued) 01128207 FIGURE 4. Receiver Propagation Delays and Noise Rejection Pin Descriptions VCC (pin 9) — Power supply pin for the device, +5V ( ± 10%). V+ (pin 11) — Positive supply for TIA/EIA-232-E drivers. Recommended external capacitor: C4 = 1.0 µF (6.3V). This supply is not intended to be loaded externally. V− (pin 15) — Negative supply for TIA/EIA-232-E drivers. Recommended external capacitor: C3 = 1.0 µF (16V). This supply is not intended to be loaded externally. C1+, C1− (pins 10 and 12) — External capacitor connection pins. Recommended capacitor – 1.0 µF (6.3V). C2+, C2− (pins 13 and 14) — External Capacitor connection pins. Recommended capacitor – 1.0 µF (16V). DIN 1–4 (pins 5, 18, 19, and 21) — Driver input pins are TTL/CMOS compatible. Inputs of unused drivers may be left open, an internal pull-up resistor (500 kΩ minimum, typically 5 MΩ) pulls input to VCC. Output will be LOW for open inputs. DOUT 1–4 (pins 2, 1, 24, and 20) — Driver output pins conform to TIA/EIA-232-E levels. RIN1 1–4 (pins 3, 7, 23, and 16) — Receiver input pins accept TIA/EIA-232-E input voltages ( ± 15V). Receivers feature a noise filter and guaranteed hysteresis of 200 mV. Unused receiver input pins may be left open. Internal input resistor (5 kΩ) pulls input LOW, providing a failsafe HIGH output. ROUT 1–4 (pins 4, 6, 22, and 17) — Receiver output pins are TTL/CMOS compatible. Receiver output HIGH voltage is specified for both CMOS and TTL load conditions. GND (pin 8) — Ground Pin. www.national.com 4 DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS14C238WM, DS14C238WMX NS Package Number M24B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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