DS14C238_02 Datasheet, PDF (4/5 Pages) National Semiconductor (TI) – Single Supply TIA/EIA-232 4X4 Driver/Receiver

Parameter Measurement Information (Continued)
FIGURE 4. Receiver Propagation Delays and Noise Rejection
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Pin Descriptions
V_CC (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).
D_IN 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 V_CC. Output will be LOW for open inputs.
D_OUT 1–4 (pins 2, 1, 24, and 20) — Driver output pins conform to TIA/EIA-232-E levels.
R_IN1 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.
R_OUT 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.
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