DS14C239 datasheet(5/8 Pages) NSC

5 / 8 page

Parameter Measurement Information (Continued)

TLF11283 – 8

FIGURE 5 Receiver Disable Load Circuit

TLF11283 – 9

FIGURE 6 Receiver TRI-STATE Timing (tPHZ tPZH)

TLF11283 – 10

FIGURE 7 Receiver TRI-STATE Timing (tPLZ tPZL)

Pin Descriptions

VCC (pin 4) Power supply pin for the device a5V

(g10%)

(pin 5)

Positive supply for TIAEIA-232-E drivers

Specified at 75V minimum and 132V maximum

(pin 8)

Negative supply for TIAEIA-232-E drivers

Recommended external capacitor C2 e 10 mF (16V) This

supply is not intended to be loaded externally

b (pins 6 7)

External capacitor connection pins

Recommended capacitor10 mF (16V)

EN (pin 14)

Controls the Receiver output TRI-STATE Cir-

cuit A High level on this pin will disable the Receiver Out-

put

DIN 1–3 (pins 24 23 16) Driver input pins are TTLCMOS

compatible Inputs of unused drivers may be left open an

internal pull-up resistor (500 kX minimum typically 5 MX)

pulls input to VCC Output will be LOW for open inputs

DOUT 1–3 (pins 19 20 13) Driver output pins conform to

TIAEIA-232-E levels

RIN 1–5 (pins 2 21 18 12 9) Receiver input pins accept

TIAEIA-232-E input voltages (g15V) Receivers feature a

noise filter and guaranteed hysteresis of 100 mV Unused

receiver input pins may be left open Internal input resistor

(5 kX) pulls input LOW providing a failsafe HIGH output

ROUT 1–5 (pins 1 22 17 11 10) Receiver output pins

are TTLCMOS compatible Receiver output HIGH voltage

is specified for both CMOS and TTL load conditions

GND (pin 3)

Ground pin

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