Order this document by MC14C89B/D
MC14C89B, AB
Quad Low Power
Line Receivers
The MC14C89B and MC14C89AB are low monolithic quad line receivers
using bipolar technology, which conform to the EIA–232–E, EIA–562 and
CCITT V.28 Recommendations. The outputs feature LSTTL and CMOS
compatibility for easy interface to +5.0 V digital systems. Internal
time–domain filtering eliminates the need for external filter capacitors in most
cases.
The MC14C89B has an input hysteresis of 0.35 V, while the MC14C89AB
hysteresis is 0.95 V. The response control pins allow adjustment of the
threshold level if desired. Additionally, an external capacitor may be added
for additional noise filtering.
The MC14C89B and MC14C89AB are available in both a 14 pin
dual–in–line plastic DIP and SOIC package.
Features:
•
Low Power Consumption
QUAD LOW POWER
LINE RECEIVERS
SEMICONDUCTOR
TECHNICAL DATA
•
•
•
•
•
•
•
•
•
Meets EIA–232–E, EIA–562, and CCITT V.28 Recommendations
TTL/CMOS Compatible Outputs
Standard Power Supply: + 5.0 V
±10%
Pin Equivalent to MC1489, MC1489A, TI’s SN75C189/A, SN75189/A
and National Semiconductor’s DS14C89/A
External Filtering Not Required in Most Cases
Threshold Level Externally Adjustable
Hysteresis: 0.35 V for MC14C89B, 0.95 V for MC14C89AB
Available in Plastic DIP, and Surface Mount Packaging
Operating Ambient Temperature: –40° to +85°C
Input A
Response
Control A
Output A
Input B
P SUFFIX
PLASTIC PACKAGE
CASE 646
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
1
2
3
4
5
6
7
(Top View)
14 VCC
13 Input D
12 Response
Control D
11 Output D
10 Input C
9
8
Response
Control C
Output C
Representative Block Diagram
(Each Receiver)
VCC
Response
Control B
Output B
Ground
Input
Response
Control
Output
ORDERING INFORMATION
Device
MC14C89BP
MC14C89ABP
MC14C89ABD
©
Motorola, Inc. 1996
Operating
Temperature Range
Package
Plastic DIP
TA = – 40° to +85°C
Plastic DIP
SO–14
Rev 0
MOTOROLA ANALOG IC DEVICE DATA
1
MC14C89B, AB
MAXIMUM RATINGS
Rating
Power Supply Voltage
VCC(max)
VCC(min)
Input Voltage
Output Load Current
Junction Temperature
Symbol
VCC
Vin
IO
TJ
Value
+ 7.0
– 0.5
±
30
Self–Limiting
–65, +150
Vdc
–
°C
Unit
Vdc
Devices should not be operated at these limits. The “Recommended Operating Conditions” table provides
for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Characteristic
Power Supply Voltage
Input Voltage
Output Current Capability
Operating Ambient Temperature
All limits are not necessarily functional concurrently.
Symbol
VCC
Vin
IO
TA
Min
4.5
–25
–7.5
–40
Typ
5.0
–
–
–
Max
5.5
25
6.0
85
Unit
Vdc
Vdc
mA
°C
ELECTRICAL CHARACTERISTICS
(–40°C
Characteristic
Supply Current (Iout = 0)
ICC @ +4.5 V
VCC
+5.5 V
p
TA
p
+85°C, unless otherwise noted.)*
Symbol
ICC
–
VOH
3.5
3.5
2.5
2.5
VOL
–
–
IOS
–35
–
VIL
VIH
VIL
VIH
0.75
1.6
0.75
1.0
3.0
–13.9
+10.3
0.95
1.90
0.95
1.3
5.5
–
35
1.25
2.25
1.25
1.5
7.0
Vdc
0.1
0.1
0.4
0.4
mA
3.8
4.8
3.7
4.7
–
–
–
–
330
700
Vdc
Min
Typ
Max
Unit
µA
p
p
Output Voltage – High, Vin
0.4 V (See Figures 2 and 3)
Iout = –20
µA
VCC = 4.5 V
VCC = 5.5 V
Iout = –3.2 mA
VCC = 4.5 V
VCC = 5.5 V
Output Voltage – Low, Vin
2.4 V
Iout = 3.2 mA
VCC = 4.5 V
VCC = 5.5 V
p
q
Output Short Circuit Current** (VCC = 5.5 V, see Figure 4)
Normally High Output shorted to ground
Normally Low Output shorted to VCC
Input Threshold Voltage (VCC = 5.0 V)
(MC14C89AB, see Figure 5)
Low Level
High Level
(MC14C89B, see Figure 6)
Low Level
High Level
Input Impedance (+4.5 V
t
VCC
t
+5.5 V –25 V
t
Vin
t
+25 V)
kΩ
*
* Typicals reflect performance @ TA = 25°C
**Only one output shorted at a time, for not more than 1.0 seconds.
TIMING CHARACTERISTICS
(TA = +25°C, unless otherwise noted.)
Characteristic
Output Transition Time (10% to 90%)
4.5 V
VCC
5.5 V
Symbol
tT
–
0.08
0.30
Min
Typ
Max
Unit
µs
p
p
p
p
Propagation Delay Time
4.5 V
VCC
5.5 V
Output Low–to–High
Output High–to–Low
Input Noise Rejection (see Figure 9)
tPLH
tPHL
–
–
1.0
3.35
2.55
1.5
6.0
6.0
–
µs
µs
2
MOTOROLA ANALOG IC DEVICE DATA
MC14C89B, AB
Figure 1. Timing Diagram
3.0 V
S.G.
0V
VCC
tPHL
50 pF
S.G.
RC
(Open)
NOTES:
S.G. set to: f = 20 kHz;
Duty Cycle = 50%;
tr , tf
5.0 ns
1.5 V
tPLH
90%
VOH
Vout
p
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
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
50 feet
–3.0 V to +3.0 V
More negative than –3.0 V
More positive than +3.0 V
Output = Binary 1
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.
EIA–232–E
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
t
2.0
V
p
30 V/µs anywhere on the waveform
5.0 V
VO
15 V for loads between
3.0 kΩ and 7.0 kΩ
p
p
p
30 V/µs anywhere on the waveform,
q
4.0 V/µs between +3.0 V and –3.0 V
VO
q
3.7 V for a load of 3.0 kΩ
Not Specified
Figure 2. Typical Output versus Supply Voltage
5.0
VOH(Iout = –20
µA)
VO , OUTPUT VOLTAGE (V)
4.0
VOH(Iout = –3.2 mA)
MC14C89AB
MC14C89B
TA = 25°C
Figure 3. Typical Output Voltage versus Temperature
5.0
4.0
VOH(Iout = –20
µA)
VOH(Iout = –3.2 mA)
MC14C89AB
MC14C89B
VCC = 5 V
3.0
2.0
1.0
0
4.5
VOL(Iout = 3.2 mA)
4.7
4.9
5.1
VCC, SUPPLY VOLTAGE (V)
5.3
5.5
VO , OUTPUT VOLTAGE (V)
3.0
2.0
1.0
VOL(Iout = 3.2 mA)
0
–40
25
–7.5
57.5
TA, AMBIENT TEMPERATURE (°C)
85
MOTOROLA ANALOG IC DEVICE DATA
3
MC14C89B, AB
Figure 4. Typical Short Circuit Current
versus Temperature
15
10
Normally Low Output Shorted to VCC
5.0
0
–5.0
–10
–15
–40
MC14C89AB
MC14C89B
VCC = 5.5 V
INPUT THRESHOLD VOLTAGE (Vdc)
SHORT CIRCUIT CURRENT (mA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
–40
VIL
57.5
25
–7.5
TA, AMBIENT TEMPERATURE (°C)
85
VIH
MC14C89AB
4.5 V VCC
Figure 5. Typical Threshold Voltage
versus Temperature
t
t
5.5 V
Normally High Output Shorted to Ground
–7.5
25
57.5
TA, AMBIENT TEMPERATURE (°C)
85
Figure 6. Typical Threshold Voltage
versus Temperature
2.0
INPUT THRESHOLD VOLTAGE (Vdc)
1.8
1.6
1.4
1.2
1.0
VIL
0.8
–40
–7.5
25
57.5
85
5.0
INPUT THRESHOLD VOLTAGE (Vdc)
MC14C89B
4.5 V VCC
Figure 7. Typical Effect of Response
Control Pin Bias
RC
RRC
VIL @ Vbat = –10 V
+
– Vbat
t
t
5.5 V
4.0
3.0
VIH
2.0
VIL @ Vbat = –3.0 V
1.0
Nominal VIL
0
0
10 kΩ
20 kΩ
30 kΩ
BIAS RESISTANCE (RRC)
4.5 V
t
VCC
t
5.5 V
40 kΩ
50 kΩ
TA, AMBIENT TEMPERATURE (°C)
Figure 8. Typical Noise Pulse Rejection
5.0
4.5
4.0
3.5
3.0
Noise Pulse Rejection
2.5
2.0
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
PW, INPUT PULSE WIDTH (µs)
MC14C89AB
MC14C89B
Pulse Rate = 300 kHz
RC Pin Open
4
Ein , PULSE AMPLITUDE (V)
MOTOROLA ANALOG IC DEVICE DATA
MC14C89B, AB
APPLICATIONS INFORMATION
Description
The MC14C89AB and MC14C89B are designed to be
direct replacements for the MC1489A and MC1489. Both
devices meet all EIA–232 specifications and also the faster
EIA–562 and CCITT V.28 specifications. Noise pulse
rejection circuitry eliminates the need for most response
control filter capacitors but does not exclude the possibility as
filtering is still possible at the Response Control (RC) pins.
Also, the Response Control pins allow for a user defined
selection of the threshold voltages. The MC14C89AB and
MC14C89B are manufactured with a bipolar technology
using low power techniques and consume at most 700
m
A,
plus load currents with a +5.0 V supply.
Outputs
The output low or high voltage depends on the state of the
inputs, the load current, the bias of the Response Control
pins, and the supply voltage. Table 1 applies to each receiver,
regardless of how many other receivers within the package
are supplying load current.
Table 1. Function Table
Receivers
Input*
H
L
Output*
L
H
MC14C89B or 0.95 V for the MC14C89AB). Figure 7 plots
equation (1) for two values of Vbat and a range of RRC.
If an RC pin is to be used for low pass filtering, the
capacitor chosen can be calculated by the equation,
C
RC
]
2.02 k
W
1
2
p
f
*
3dB
(2)
where f
–3 dB
represents the desired –3 dB role–off frequency
of the low pass filter.
Figure 9. Application to Adjust Thresholds
Input Pin
Response Control Pin
RRC
+
–
Vbat
*The asterisk denotes A, B, C, or D.
Another feature of the MC14C89AB and MC14C89B is
input noise rejection. The inputs have the ability to ignore
pulses which exceed the VIH and VIL thresholds but are less
than 1.0
m
s in duration. As the duration of the pulse exceeds
1.0
m
s, the noise pulse may still be ignored depending on its
amplitude. Figure 8 is a graph showing typical input noise
rejection as a function of pulse amplitude and pulse duration.
Figure 8 reflects data taken for an input with an unconnected
RC pin and applied to the MC14C89AB and MC14C89B.
Operating Temperature Range
The ambient operating temperature range is listed as
–40°C to +85°C, and the devices are designed to meet the
EIA–232–E, EIA–562 and CCITT V.28 specifications over
this temperature range. The timing characteristics are
guaranteed to meet the specifications at +25°C. The
maximum ambient operating temperature is listed as +85°C.
However, a lower ambient may be required depending on
system use (i.e., specifically how many receivers within a
package are used), and at what current levels they are
operating. The maximum power which may be dissipated
within the package is determined by:
PD
(max)
Receiver Inputs and Response Control
The receiver inputs determine the state of the outputs in
accordance with Table 1. The nominal VIL and VIH
thresholds are 0.95 V and 1.90 V respectively for the
MC14C89AB. For the MC14C89B, the nominal VIL and VIH
thresholds are 0.95 and 1.30, respectively. The inputs are
able to withstand
±30
V referenced to ground. Should the
input voltage exceed ground by more than
±
30 V, excessive
currents will flow at the input pin. Open input pins will
generate a logic high output, but good design practices
dictate that inputs should never be left open.
The Response Control (RC) pins are coupled to the inputs
through a resistor string. The RC pins provide for adjustment
of the threshold voltages of the IC while preserving the
amount of hysteresis. Figure 10 shows a typical application
to adjust the threshold voltages. The RC pins also provide
access to an internal resistor string which permits low pass
filtering of the input signal within the IC. Like the input pins,
the RC pins should not be taken above or below ground by
more than
±
30 V or excessive currents will flow at these pins.
The dependence of the low level threshold voltage (VIL) upon
RRC and Vbat can be described by the following equation:
V
+
T
– T
J(max)
A
R
q
JA
IL
]
V 0.09
5.32 k
W
*
Vbat
505
R
RC
505
(1.6)
)
2.02 k
W
W
(1)
where: R
θJA
= thermal resistance (typ., 100°C/W for the
DIP and 125°C/W for the SOIC packages);
TJ(max) = maximum operating junction temperature
(150°C); and
TA = ambient temperature.
PD = {[(VCC – VOH)
IOH
]
or
[(VOL)
I
OL
]}
each receiver + (VCC ICC)
)
6.67 R 106
W
2
W
RC
where: VCC = positive supply voltage;
VOH, VOL = measured or estimated from Figure 2
and 3;
ICC = measured quiescent supply current.
As indicated, the first term (in brackets) must be calculated
and summed for each of the four receivers, while the last
term is common to the entire package.
VIH can be found by calculating for VIL using equation (1)
then adding the hysteresis for each device (0.35 for the
MOTOROLA ANALOG IC DEVICE DATA
5
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