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Número de pieza | 74HCT123-Q100 | |
Descripción | Dual retriggerable monostable multivibrator | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
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No Preview Available ! 74HC123-Q100; 74HCT123-Q100
Dual retriggerable monostable multivibrator with reset
Rev. 2 — 19 January 2015
Product data sheet
1. General description
The 74HC123-Q100; 74HCT123-Q100 are high-speed Si-gate CMOS devices and are pin
compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with
JEDEC standard no. 7A.
The 74HC123-Q100; 74HCT123-Q100 are dual retriggerable monostable multivibrators
with output pulse width control by three methods:
1. The basic pulse is defined by the selection of the external resistor (REXT) and
capacitor (CEXT).
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. Alternatively an output delay can be terminated at any time by a
LOW-going edge on input nRD, which also inhibits the triggering.
3. An internal connection from nRD to the input gates makes it possible to trigger the
circuit by a HIGH-going signal at input nRD as shown in Table 3.
Schmitt trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower
input rise and fall times.
This product has been qualified to the Automotive Electronics Council (AEC) standard
Q100 (Grade 1) and is suitable for use in automotive applications.
2. Features and benefits
Automotive product qualification in accordance with AEC-Q100 (Grade 1)
Specified from 40 C to +85 C and from 40 C to +125 C
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
ESD protection:
MIL-STD-883, method 3015 exceeds 2000 V
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V (C = 200 pf, R = 0 )
Specified from 40 C to +85 C and from 40 C to +125 C
1 page NXP Semiconductors
74HC123-Q100; 74HCT123-Q100
Dual retriggerable monostable multivibrator with reset
6. Functional description
Table 3.
Input
nRD
L
X
X
H
Function table[1]
nA
X
H
X
L
H
L
nB
X
X
L
H
H
Output
nQ
L
L[2]
L[2]
nQ
H
H[2]
H[2]
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; = LOW-to-HIGH transition; = HIGH-to-LOW transition;
= one HIGH level output pulse;
= one LOW level output pulse.
[2] If the monostable was triggered before this condition was established, the pulse continues as programmed.
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
Min Max Unit
VCC supply voltage
IIK input clamping current
VI < 0.5 V or VI > VCC + 0.5 V
0.5 +7
- 20
V
mA
IOK output clamping current
IO output current
VO < 0.5 V or VO > VCC + 0.5 V
except for pins nREXT/CEXT;
VO = 0.5 V to (VCC + 0.5 V)
- 20 mA
- 25 mA
ICC
IGND
Tstg
supply current
ground current
storage temperature
- 50 mA
- 50 mA
65 +150 C
Ptot total power dissipation
SO16 package
[1] -
500 mW
TSSOP16 package
[2] -
500 mW
DHVQFN16 package
[3] -
500 mW
[1] For SO16 packages: Ptot derates linearly with 8 mW/K above 70 C.
[2] For TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
[3] For DHVQFN16 packages: Ptot derates linearly with 4.5 mW/K above 60 C.
74HC_HCT123_Q100
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 January 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 23
5 Page NXP Semiconductors
74HC123-Q100; 74HCT123-Q100
Dual retriggerable monostable multivibrator with reset
W:
QV
DDD
.
IDFWRU
DDD
&(;7S)
9&&9
VCC = 5.0 V; Tamb = 25 C.
(1) REXT = 100 k
(2) REXT = 50 k
(3) REXT = 10 k
(4) REXT = 2 k
Fig 7. Typical output pulse width as a function of the
external capacitor value
CEXT = 10 nF; REXT = 10 k to 100 k.
Tamb = 25 C.
Fig 8. 74HC123-Q100 typical ‘K’ factor as function of
VCC
74HC_HCT123_Q100
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 January 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 23
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Páginas | Total 23 Páginas | |
PDF Descargar | [ Datasheet 74HCT123-Q100.PDF ] |
Número de pieza | Descripción | Fabricantes |
74HCT123-Q100 | Dual retriggerable monostable multivibrator | NXP Semiconductors |
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