전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

74HC4538 데이터시트(PDF) 8 Page - Hitachi Semiconductor

부품명 74HC4538
상세설명  Dual Precision Retriggerable/Resettable Monostable Multivibrators
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  HITACHI [Hitachi Semiconductor]
홈페이지  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

74HC4538 데이터시트(HTML) 8 Page - Hitachi Semiconductor

Back Button 74HC4538 Datasheet HTML 4Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 5Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 6Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 7Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 8Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 9Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 10Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 11Page - Hitachi Semiconductor 74HC4538 Datasheet HTML 12Page - Hitachi Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 16 page
background image
HD74HC4538
8
Reset Operation
A low voltage applied to the Reset pin always forces the Q output of the HC4538 to a low state.
The timing diagram illustrates the case in which reset occurs (20) while C
X is charging up toward the
reference voltage of the upper reference circuit (21). When a reset occurs, the output of the reset latch goes
low (22), turning on transistor M1. Thus C
X is allowed to quickly charge up to VCC (23) to await the next
trigger signal.
Retrigger Operation
When used in the retriggerable mode (Fig. 3), the HC4538 may be retriggered during timing out of the
output pulse at any time after the trigger-control circuit flip-flopw has been reset (24). Because the trigger-
control circuit flip-flop resets shortly after C
X has discharged to the reference voltage of the lower reference
circuit (25), the minimum retrigger time, t
rr (Switching Waveform 1) is a function of internal propagation
delays and the discharge time of C
X:
Fig. 4 shows the device configured in the non-retriggerable mode.
Power-Down Considerations
Large values of C
X may cause problems when powering down the HC4538 because of the amount of
energy stored in the capacitor. When a system containing this device is powered down, the capacitor may
discharge from V
CC through the input protection diodes at pin 2 or pin 14.
Current through the protection
diodes must be limited to 30 mA; therefore, the turn-off time of the V
CC power supply must not be faster
than t = V
CC•CX/(30 mA).
For example, if V
CC = 5 V and CX = 15 µF, the VCC supply must turn off no
faster than t = (5 V)•(15 µF)/30 mA = 2.5 ms. This is usually not a problem because power supplies are
heavily filtered and cannot discharge at this rate.
When a more rapid decrease of V
CC to zero voltage occurs, the HC4538 may sustain damage. To avoid this
possibility, use an external clamping diode.


유사한 부품 번호 - 74HC4538

제조업체부품명데이터시트상세설명
logo
ON Semiconductor
74HC4538 ONSEMI-74HC4538 Datasheet
291Kb / 16P
   Dual Precision Monostable Multivibrator(Retriggerable, Resettable)
April, 2001 ??Rev. 8
logo
NXP Semiconductors
74HC4538 PHILIPS-74HC4538 Datasheet
149Kb / 13P
   Dual retriggerable precision monostable multivibrator
September 1993
logo
STMicroelectronics
74HC4538 STMICROELECTRONICS-74HC4538 Datasheet
288Kb / 14P
   DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
logo
Texas Instruments
74HC4538 TI-74HC4538 Datasheet
64Kb / 11P
[Old version datasheet]   High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator
logo
Toshiba Semiconductor
74HC4538 TOSHIBA-74HC4538 Datasheet
477Kb / 10P
   DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
More results

유사한 설명 - 74HC4538

제조업체부품명데이터시트상세설명
logo
Renesas Technology Corp
HD74HC4538 RENESAS-HD74HC4538 Datasheet
204Kb / 14P
   Dual Precision Retriggerable/Resettable Monostable Multivibrators
logo
Hitachi Semiconductor
HD74LV123A HITACHI-HD74LV123A Datasheet
91Kb / 20P
   Dual Retriggerable Monostable Multivibrators
logo
Texas Instruments
SN54AHCT123A TI-SN54AHCT123A_07 Datasheet
726Kb / 24P
[Old version datasheet]   DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
logo
Renesas Technology Corp
HD74LV123A RENESAS-HD74LV123A Datasheet
119Kb / 16P
   Dual Retriggerable Monostable Multivibrators
logo
Texas Instruments
SN54AHC123A TI-SN54AHC123A Datasheet
637Kb / 23P
[Old version datasheet]   DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
logo
Toshiba Semiconductor
TC4538BP TOSHIBA-TC4538BP Datasheet
252Kb / 6P
   DUAL PRECISION RETRIGGERABLE/RESETTABLE MONOSTABLE MULTIVIBRATOR
logo
Texas Instruments
SN54AHC123A TI1-SN54AHC123A_15 Datasheet
1Mb / 28P
[Old version datasheet]   DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
logo
ON Semiconductor
MC74HC4538A ONSEMI-MC74HC4538A Datasheet
291Kb / 16P
   Dual Precision Monostable Multivibrator(Retriggerable, Resettable)
April, 2001 ??Rev. 8
logo
Texas Instruments
SN54LS422 TI-SN54LS422 Datasheet
323Kb / 9P
[Old version datasheet]   RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SN54LS422 TI1-SN54LS422_12 Datasheet
612Kb / 9P
[Old version datasheet]   RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com