DS78C20 Datasheet, PDF(3/6 Page) National Semiconductor (TI) – Dual CMOS Compatible Differential Line Receiver

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DS78C20 Datasheet, PDF (3/6 Pages) National Semiconductor (TI) – Dual CMOS Compatible Differential Line Receiver

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Switching Characteristics

VCC = 5V, TA = 25ËC

Symbol

Parameter

Conditions

Min

Typ

Max

Units

tpd0(D)

tpd1(D)

tpd0(S)

tpd1(S)

Differential Input to â0â Output

Differential Input to â1â Output

Strobe Input to â0â Output

Strobe Input to â1â Output

CL = 50 pF

100

150

100

150

Note 2: âAbsolute Maximum Ratingsâ are those values beyond which the safety of the device cannot be guaranteed. Except for âOperating Temperature Rangeâ they

are not meant to imply that the devices should be operated at these limits. The table of âElectrical Characteristicsâ provides conditions for actual device operation.

Note 3: Unless otherwise specified min/max limits apply across the â55ËC to +125ËC temperature range for the DS78C20 and across the 0ËC to +70ËC range for the

DS88C20. All typical values are for TA = 25ËC, VCC = 5V and VCM = 0V.

Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown

as max or min on absolute value basis.

Note 5: Only one output at a time should be shorted.

Note 6: Refer to EIA-RS-422 for exact conditions.

Typical Applications

RS-422/RS-423 Application

DS005798-2

Note 7: (Optional internal termination resistor.)

a) Capacitor in series with internal line termination resistor, terminates the line and saves termination power. Exact value depends on line length.

b) Pin 1 connected to pin 2; terminates the line.

c) Pin 2 open; no internal line termination.

d) Transmission line may be terminated elsewhere or not at all.

Note 8: Optional to control response time.

Note 9: VCC 4.5V to 15V for the DS78C20. For further information on line drivers and line receivers, refer to applicaton notes AN-22, AN-83 and AN-108.

RS-232-C Application with Hysteresis

DS005798-3

For signals which require fail-safe or have slow rise and fall times, use R1

and D1 as shown above. Otherwise, the positive input (pin 3 or 11) may be

connected to ground.

DS005798-4

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