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MC14C88B bảng dữ liệu(PDF) 4 Page - Motorola, Inc

tên linh kiện MC14C88B
Giải thích chi tiết về linh kiện  QUAD LOW POWER LINE DRIVER
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nhà sản xuất  MOTOROLA [Motorola, Inc]
Trang chủ  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC14C88B bảng dữ liệu(HTML) 4 Page - Motorola, Inc

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MC14C88B
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Timing Diagram
tR3
VOH
tF3
tF1
tF2
tPHL
1.5 V
0 V
S.G.
3.0 V
VOUT
CL
3.0 k
VCC
VEE
S.G.
–3.3 V
tPLH
90%
3.3 V
3.0 V
–3.0 V
10%
tR2
tR1
0 V
VOL
NOTES: S.G. set to: f = 20 kHz for Propogation Delay A
and f = 64 kHz for Propagation Delay B; Duty
Cycle = 50%; tR, tFp 5.0 ns
Vout
STANDARDS COMPLIANCE
The MC14C88 is designed to comply with EIA–232–D
(formerly RS–232), the newer EIA–562 (which is a higher
speed version of the EIA–232), and CCITT’s V.28. EIA–562
was written around modern integrated circuit technology,
whereas EIA–232 retains many of the specs 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 drivers.
Parameter
EIA–232–D
EIA–562
Maximum Data Rate
20 kbaud
38.4 kbaud Asynchronous
64 kbaud Synchronous
Maximum Cable Length
50 feet
Based on cable capacitance/data rate
Maximum Slew Rate
p 30 V/µs anywhere on the waveform
p 30 V/µs anywhere on the waveform
q 4.0 V/µs between +3.0 and –3.0 V
Transition Region
–3.0 to +3.0 V
–3.3 to +3.3 V
Transition Time
For UI
q 25 ms, tR p1.0 ms
For 25 ms > UI > 125
µs, tR p 4% UI
For UI
t 125 µs, tR p 5.0 µs
For UI
q 50 µs, 220 ns t tR p 3.1 µs
For UI
t 50 µs, 220 ns t tR p 2.1 µs
(within the transition region)
MARK (one, off)
More negative than –3.0 V
More negative than –3.3 V
Space (zero, on)
More positive than +3.0 V
More positive than +3.3 V
Short Circuit Proof ?
Yes, to any system voltage
Yes, to ground
Short Circuit Current
p 500 mA to any system voltage
p 60 mA to ground
Open Circuit Voltage
VOC p 25 V
VOC t 13.2 V
Loaded Output Voltage
5.0 V
p VO p15 V for loads between
3.0 k
Ω and 7.0 kΩ
VO q 3.7 V for a load of 3.0 kΩ
Power Off Input Source Impedance
q 300 Ω for  VO p 2.0 V
q 300 Ω for  VO p 2.0 V
NOTE:
UI = Unit Interval, or bit time.
V.28 standard has the same specifications as EIA–232, with the exception of transition time which is listed as “less than 1.0 ms, or 3% of the UI,
whichever is less”.


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