MC14C89AB Ver la hoja de datos (PDF) - Motorola => Freescale
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MC14C89AB Datasheet PDF : 6 Pages
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MC14C89B, AB
Figure 1. Timing Diagram
3.0 V
S.G.
1.5 V
0V
VCC
tPHL
tPLH
S.G.
50 pF
Vout
RC
(Open)
90%
VOH
NOTES: S.G. set to: f = 20 kHz;
p Duty Cycle = 50%;
tr , tf 5.0 ns
Vout
50%
50%
10%
tT
tT
VOL
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
Max Data Rate
Max Cable Length
Transition Region
MARK (one, off)
SPACE (zero, on)
Fail Safe
Open Circuit Input Voltage
Slew Rate (at the driver)
Loaded Output Voltage (at the driver)
20 kBaud
EIA–232–E
50 feet
–3.0 V to +3.0 V
More negative than –3.0 V
More positive than +3.0 V
Output = Binary 1
t 2.0 V
p30 V/µs anywhere on the waveform
p p 5.0 V VO 15 V for loads between
3.0 kΩ and 7.0 kΩ
EIA–562
38.4 kBaud Asynchronous
64 kBaud Synchronous
Based on cable capacitance/data rate
–3.0 V to +3.0 V
More negative than –3.3 V
More positive than +3.3 V
Output = Binary 1
Not Specified
p30 V/µs anywhere on the waveform,
q4.0 V/µs between +3.0 V and –3.0 V
q VO 3.7 V for a load of 3.0 kΩ
Figure 2. Typical Output versus Supply Voltage
5.0
VOH(Iout = –20 µA)
4.0
MC14C89AB
VOH(Iout = –3.2 mA)
MC14C89B
TA = 25°C
3.0
2.0
Figure 3. Typical Output Voltage versus Temperature
5.0
VOH(Iout = –20 µA)
4.0
VOH(Iout = –3.2 mA)
MC14C89AB
MC14C89B
3.0
VCC = 5 V
2.0
1.0
1.0
VOL(Iout = 3.2 mA)
0
0
4.5
4.7
4.9
5.1
5.3
5.5
–40
VCC, SUPPLY VOLTAGE (V)
VOL(Iout = 3.2 mA)
–7.5
25
57.5
85
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
3
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