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74HCT423 PDF даташит

Спецификация 74HCT423 изготовлена ​​​​«Philips» и имеет функцию, называемую «Dual retriggerable monostable multivibrator with reset».

Детали детали

Номер произв 74HCT423
Описание Dual retriggerable monostable multivibrator with reset
Производители Philips
логотип Philips логотип 

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74HCT423 Даташит, Описание, Даташиты
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Rev. 6 — 19 December 2011
Product data sheet
1. General description
74HC423; 74HCT423 are high-speed Si-gate CMOS devices that are pin compatible with
Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC423; 74HCT423 dual retriggerable monostable multivibrator with reset has two
methods of output pulse width control.
1. The minimum pulse width is essentially determined by the selection of an external
resistor (REXT) and capacitor (CEXT), see Section 12.1.
2. Once triggered, the basic output pulse width may be extended by retriggering the
gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By
repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made
as long as desired. When nRD is LOW, it forces the nQ output LOW, the nQ output
HIGH and also inhibits the triggering. Figure 10 and Figure 11 illustrate pulse control
by reset.
The nA and nB inputs’ Schmitt trigger action makes them highly tolerant to slower input
rise and fall times.
The 74HC423; 74HCT423 are identical to the 74HC123; 74HCT123 except that they
cannot be triggered via the reset input.
2. Features and benefits
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100 % duty factor
Direct reset terminates output pulse
Schmitt-trigger action on all inputs except for the reset input
Complies with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from 40 C to +85 C and from 40 C to +125 C









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74HCT423 Даташит, Описание, Даташиты
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
3. Ordering information
Table 1. Ordering information
Type number Package
Temperature range Name
Description
Version
74HC423N 40 C to +125 C DIP16
plastic dual in-line package; 16 leads (300 mil)
SOT38-4
74HCT423N
74HC423D 40 C to +125 C
74HCT423D
SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74HC423BQ 40 C to +125 C
74HCT423BQ
DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1
quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm
74HCT423DB 40 C to +125 C SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74HCT423PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
4. Functional diagram
1A 1
1B 2
1RD 3
2A 9
2B 10
2RD 11
Fig 1. Functional Diagram
S
Q
T
Q
RD
S
Q
T
Q
RD
14
1CEXT
15
1REXT/ CEXT
13
1Q
4 1Q
6
2CEXT
7 2REXT/CEXT
5 2Q
12 2Q
001aah796
74HC_HCT423
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 19 December 2011
© NXP B.V. 2011. All rights reserved.
2 of 24









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74HCT423 Даташит, Описание, Даташиты
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
1 1A
9 2A
2 1B
10 2B
3 1RD
11 2RD
Fig 2. Logic symbol
1CEXT 14
2CEXT 6
1REXT/CEXT 15
2REXT/CEXT 7
S
Q
T
Q
RD
1Q 13
2Q 5
1Q 4
2Q 12
001aah797
14
CX
15
RCX
1
&
2
3
R
13
4
6
CX
7
RCX
9
&
10
5
12
11 R
001aah798
Fig 3. IEC Logic symbol
REXT/CEXT
VCC
RD
R
CL
VCC
VCC
CL
CL
R
A
B
Fig 4. Logic diagram
74HC_HCT423
Product data sheet
CL CL
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 19 December 2011
Q
Q
001aah799
© NXP B.V. 2011. All rights reserved.
3 of 24










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