MC14C88B 데이터 시트보기 (PDF) - Motorola => Freescale
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MC14C88B Datasheet PDF : 8 Pages
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MC14C88B
APPLICATIONS INFORMATION
Description
The MC14C88 was designed to be a direct replacement
for the MC1488 in that it meets all EIA–232 specifications.
However, use is extended as the MC14C88 also meets the
faster EIA–562 and CCITT V.28 specifications. Slew rate
limited outputs conform to the mentioned specifications and
eliminate the need for external output capacitors. Low
power consumption is made possible by BiMOS technology.
Power supply current is limited to less than 160 mA, plus
load currents over the supply voltage range of ±4.5 V to
±15 V (see Figure 2).
Outputs
The output low or high voltage depends on the state of the
inputs, the load current, and the supply voltage (see Table 1
and Figure 3). The graphs apply to each driver regardless of
how many other drivers within the package are supplying
load current.
Table 1. Function Tables
Driver 1
Input A
Output A
H
L
L
H
Input *1
Drivers 2 through 4
Input *2
H
H
L
X
X
L
H = High level, L = Low level, X = Don’t care.
Output*
L
H
H
Driver Inputs
The driver inputs determine the state of the outputs in
accordance with Table 1. The nominal threshold voltage for
the inputs is 1.4 Vdc, and for proper operation, the input
voltages should be restricted to the range Gnd to VCC.
Should the input voltage drop below VEE by more than 0.3 V
or rise above VEE by more than 39 V, excessive currents will
flow at the input pin. Open input pins are equivalent to logic
high, but good design practices dictate that inputs should
never be left open.
Operating Temperature Range
The ambient operating temperature range is listed at –40°
to +85°C and meets EIA–232–D, EIA–562 and CCITT V.28
specifications over this temperature range. The maximum
ambient temperature is listed as +85°C. However, a lower
ambient may be required depending on system use, i.e.
specifically how many drivers 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:
+ PDmax
TJmax – TA
Rq JA
where: RθJA = the package thermal resistance (typically,
where: 100°C/W for the DIP package, 125°C/W for the
where: SOIC package);
where: TJmax = the maximum operating junction
where: temperature (150°C); and
where: TA = the ambient temperature.
PD = { [ (VCC – VOH) IOH ] or [ (VOL – VEE)
PD = IOL ] } each driver + (VCC ICC) + (VEE IEE)
where: VCC and VEE are the positive and negative
where: supply voltages;
where: VOH and VOL are measured or estimated from
where: Figure 3;
where: ICC and IEE are the quiescent supply currents
where: measured or estimated from Figure 2.
As indicated, the first term (in brackets) must be calculated
and summed for each of the four drivers, while the last terms
are common to the entire package.
6
MOTOROLA ANALOG IC DEVICE DATA
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