HEF4047B Просмотр технического описания (PDF) - NXP Semiconductors.
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HEF4047B Datasheet PDF : 20 Pages
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NXP Semiconductors
HEF4047B
Monostable/astable multivibrator
Table 9. Functional connections …continued[1]
Function
Monostable multivibrator
Pins connected to
Output pulse from
VDD
VSS
input pulse pins
Positive edge-triggering
4, 14
5, 6, 7, 9, 12
8
10, 11
Negative edge-triggering
4, 8, 14
5, 7, 9, 12
6
10, 11
Retriggerable
4, 14
5, 6, 7, 9
8, 12
10, 11
External countdown[2]
14
5, 6, 7, 8, 9, 12
-
10, 11
Output period or
pulse width
at pins 10, 11;
tM = 2.48 RtCt
[1] In all cases, external resistor between pins 2 and 3, external capacitor between pins 1 and 3.
[2] Input pulse to RESET of external counting chip: external counting chip output to pin 4.
11.1 Astable mode design information
11.1.1 Unit-to-unit transfer voltage variations
The following analysis presents worst case variations from unit-to-unit as a function of
transfer voltage (VTR) shift for free running (astable) operation.
HEF4047B
Product data sheet
26&,//$725
287387 SLQ
2287387
SLQ
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Fig 6. Astable mode waveforms
DDD
t1
=
–RtCt
In ---------V----T---R----------
VDD + VTR
(1)
t2
=
–RtCt
In --V----D----D----–-----V----T---R---
2VDD – VTR
(2)
tA
=
2t1 + t2
=
–2RtCt
In -------------V----T---R--------V----D----D----–-----V----T---R--------------
VDD + VTR2VDD – VTR
(3)
, where tA = astable mode pulse width; see Table 10.
Table 10. Values for astable mode pulse width (tA)
VTR
Min
Typ
Max
VDD = 5 V or 10 V 0.3 VDD 0.5 VDD 0.7 VDD
VDD = 15 V
4V
0.5 VDD
11 V
Min
4.71 RtCt
4.84 RtCt
tA
Typ[1]
4.40 RtCt
4.40 RtCt
[1] Therefore if tA = 4.40 RtCt is used, the maximum variation is (+7.0%; 0.0%) at 10 V.
Max
4.71 RtCt
4.84 RtCt
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 16 December 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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