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PDF MC14C89B Data sheet ( Hoja de datos )
| Número de pieza | MC14C89B | |
| Descripción | Quad Low Power Line Receivers | |
| Fabricantes | SYC | |
| Logotipo |  |
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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
• 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
Representative Block Diagram
(Each Receiver)
VCC
Input
QUAD LOW POWER
LINE RECEIVERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 646
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
Input A 1
Response
Control A
2
Output A 3
Input B 4
Response
Control B
5
Output B 6
Ground 7
14 VCC
13 Input D
12
Response
Control D
11 Output D
10 Input C
9
Response
Control C
8 Output C
(Top View)
Response
Control
MOTOROLA ANALOG IC DEVICE DATA
Output
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC14C89BP
Plastic DIP
MC14C89ABP TA = – 40° to +85°C Plastic DIP
MC14C89ABD
SO–14
© Motorola, Inc. 1996
Rev 0
1
1 page  
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
musing low power techniques and consume at most 700 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*
Output*
HL
LH
*The asterisk denotes A, B, C, or D.
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:
]NJ * ƪ ) ƫNjW WVIL
V0.09
Vbat
505
RRC (1.6)
2.02 k
ȡ ) ȣ5.32 kW
6.67 106 W2
RRC
ȧȢ ȧȤ505 W
(1)
VIH can be found by calculating for VIL using equation (1)
then adding the hysteresis for each device (0.35 for the
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,
] *CRC
2.02 kW 12p 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
Another feature of the MC14C89AB and MC14C89B is
input noise rejection. The inputs have the ability to ignore
mpulses which exceed the VIH and VIL thresholds but are less
than 1.0 s in duration. As the duration of the pulse exceeds
m1.0 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)
TJ(max) – TA
RqJA
where: RθJA = 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) IOL]}each receiver + (VCC ICC)
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.
MOTOROLA ANALOG IC DEVICE DATA
5
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