MC14C89B, AB

3

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Timing Diagram

tT

tPLH

50%

Vout

3.0 V

0 V

S.G.

1.5 V

tPHL

Vout

VOL

VOH

RC

(Open)

90%

S.G.

50%

10%

VCC

50 pF

tT

NOTES: S.G. set to: f = 20 kHz;

Duty Cycle = 50%;

tr , tf p 5.0 ns

STANDARDS COMPLIANCE

The MC14C89B and MC14C89AB are designed to comply

with EIA–232–E (formerly RS–232), the newer EIA–562

(which is a higher speed version of the EIA–232), and CCITT

V.28 Recommendations. EIA–562 was written around

modern integrated circuit technology, whereas EIA–232

retains many of the specifications 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 receivers.

Parameter

EIA–232–E

EIA–562

Max Data Rate

20 kBaud

38.4 kBaud Asynchronous

64 kBaud Synchronous

Max Cable Length

50 feet

Based on cable capacitance/data rate

Transition Region

–3.0 V to +3.0 V

–3.0 V to +3.0 V

MARK (one, off)

More negative than –3.0 V

More negative than –3.3 V

SPACE (zero, on)

More positive than +3.0 V

More positive than +3.3 V

Fail Safe

Output = Binary 1

Output = Binary 1

Open Circuit Input Voltage

t2.0V

Not Specified

Slew Rate (at the driver)

p30 V/µs anywhere on the waveform

p30 V/µs anywhere on the waveform,

q4.0 V/µs between +3.0 V and –3.0 V

Loaded Output Voltage (at the driver)

5.0 V

p VOp 15 V for loads between

3.0 k

Ω and 7.0 kΩ

VO q 3.7 V for a load of 3.0 kΩ

Figure 2. Typical Output versus Supply Voltage

Figure 3. Typical Output Voltage versus Temperature

MC14C89AB

MC14C89B

TA = 25°C

–40

VOH(Iout = –20 µA)

VCC, SUPPLY VOLTAGE (V)

VOL(Iout = 3.2 mA)

VOH(Iout = –3.2 mA)

4.5

0

1.0

2.0

3.0

4.0

5.0

25

TA, AMBIENT TEMPERATURE (°C)

57.5

–7.5

85

5.5

5.3

5.1

4.9

4.7

0

1.0

2.0

3.0

4.0

5.0

VOH(Iout = –20 µA)

VOH(Iout = –3.2 mA)

VOL(Iout = 3.2 mA)

MC14C89AB

MC14C89B

VCC = 5 V