mc14c89b ON Semiconductor, mc14c89b Datasheet - Page 7

• Manufacturer Part Number: mc14c89b
• Description: Quad Low Power Line Receivers
• Manufacturer: ON Semiconductor

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
V
can be calculated by the equation,
where f
of the low pass filter.
rejection. The inputs have the ability to ignore pulses which exceed the
V
duration of the pulse exceeds 1.0 ms, 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
+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:
summed for each of the four receivers, while the last term is common
to the entire package.
where: R
where: V
bat
IH
V
If an RC pin is to be used for low pass filtering, the capacitor chosen
Another feature of the MC14C89AB and MC14C89B is input noise
The ambient operating temperature range is listed as −40°C to
As indicated, the first term (in brackets) must be calculated and
V
IH
and V
and a range of R
OH
T
can be found by calculating for V
−3 dB
J(max)
, V
C
I
θJA
P
CC
CC
T
OL
IL
RC
A
D
represents the desired −3 dB role−off frequency
=
=
=
=
=
=
=
thresholds but are less than 1.0 ms in duration. As the
P D
thermal resistance (typ., 100°C/W for the
DIP and 125°C/W for the SOIC packages);
maximum operating junction temperature
(150°C); and
ambient temperature.
{[(V
[(V
positive supply voltage;
measured or estimated from Figure 2
and 3;
measured quiescent supply current.
]
(max)
OL
CC
2.02 kW 2p f
)⎪I
RC
− V
+
.
OL
OH
⎪]}
T
)⎥ I
1
J(max)
each receiver +
*3dB
R
OH
qJA
⎪] or
– T
A
(V
IL
CC
using equation (1) then
I
CC
(2)
http://onsemi.com
)
7
Figure 9. Application to Adjust Thresholds
Input Pin
+
−
R
V
Response Control Pin
RC
bat