MC14C88B 查看數據表（PDF） - Motorola => Freescale

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MC14C88B

QUAD LOW POWER LINE DRIVER

Motorola => Freescale 

MC14C88B

Figure 1. Timing Diagram

3.0 V

S.G.

1.5 V

VCC

0V

tPHL

tPLH

S.G.

3.0 k

VEE

CL

VOUT

VOH

90%

NOTES: S.G. set to: f = 20 kHz for Propogation Delay A

3.3 V

p and f = 64 kHz for Propagation Delay B; Duty

Cycle = 50%; tR, tF 5.0 ns

3.0 V

Vout

0V

–3.0 V

–3.3 V

tF2

10%

tR2

VOL

tF1

tR1

tF3

tR3

STANDARDS COMPLIANCE

The MC14C88 is designed to comply with EIA–232–D

(formerly RS–232), the newer EIA–562 (which is a higher

speed version of the EIA–232), and CCITT’s V.28. EIA–562

was written around modern integrated circuit technology,

whereas EIA–232 retains many of the specs written around

the electro–mechanical circuitry in use at the time of its

creation. Yet the user will find enough similarities to allow a

certain amount of compatibility among equipment built to the

two standards. Following is a summary of the key

specifications relating to the systems and the drivers.

Parameter

EIA–232–D

EIA–562

Maximum Data Rate

20 kbaud

38.4 kbaud Asynchronous

64 kbaud Synchronous

Maximum Cable Length

Maximum Slew Rate

50 feet

p 30 V/µs anywhere on the waveform

Based on cable capacitance/data rate

p 30 V/µs anywhere on the waveform

q 4.0 V/µs between +3.0 and –3.0 V

Transition Region

Transition Time

MARK (one, off)

–3.0 to +3.0 V

q p For UI 25 ms, tR 1.0 ms

p For 25 ms > UI > 125 µs, tR 4% UI

t p For UI 125 µs, tR 5.0 µs

More negative than –3.0 V

–3.3 to +3.3 V

q t p For UI 50 µs, 220 ns tR 3.1 µs

t t p For UI 50 µs, 220 ns tR 2.1 µs

(within the transition region)

More negative than –3.3 V

Space (zero, on)

More positive than +3.0 V

More positive than +3.3 V

Short Circuit Proof ?

Short Circuit Current

Open Circuit Voltage

Loaded Output Voltage

Power Off Input Source Impedance

Yes, to any system voltage

p 500 mA to any system voltage

p  VOC  25 V

p p 5.0 V  VO  15 V for loads between

3.0 kΩ and 7.0 kΩ

q p 300 Ω for  VO  2.0 V

Yes, to ground

p 60 mA to ground

t  VOC  13.2 V

q  VO  3.7 V for a load of 3.0 kΩ

q p 300 Ω for  VO  2.0 V

NOTE: UI = Unit Interval, or bit time.

V.28 standard has the same specifications as EIA–232, with the exception of transition time which is listed as “less than 1.0 ms, or 3% of the UI,

whichever is less”.

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MOTOROLA ANALOG IC DEVICE DATA

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