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부품번호 | M74HC423 기능 |
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기능 | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR | ||
제조업체 | ST Microelectronics | ||
로고 | |||
전체 14 페이지수
M54HC423/423A
M74HC423/423A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
. HIGH SPEED
tPD = 25 ns (TYP) at VCC = 5V
. LOW POWER DISSIPATION
STANDBY STATE ICC=4 µA (MAX.) AT TA=25°C
ACTIVE STATE ICC = 700 µA (MAX.) AT VCC=5V
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH = IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. WIDE OUTPUT PULSE WIDTH RANGE
tWOUT = 120 ns ∼ 60 s OVER AT VCC = 4.5 V
. PIN AND FUNCTION COMPATIBLE WITH
54/74LS423
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
DESCRIPTION
PIN CONNECTIONS (top view)
The M54/74HC423/423A are high speed CMOS
MONOSTABLE multivibrators fabricated with
silicon gate C2MOS technology.
They achieve the high speed operation similar to
equivalent LSTTL while maintaining the CMOS low
power dissipation. There are two trigger inputs, A
INPUT (negative edge) and B INPUT (positive
edge). These inputs are valid for rising/falling
signals, (tr – tf – 1 sec). After triggering the output
maintains the MONOSTABLE state for the time
period determined by the external resistor Rx and
capacitor Cx.
Two different pulse width constant are available:
K ≅ 0.46 for HC423 K ≅ 1 for HC423A.
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLEperiod it makes the MONOSTABLE
period longer. Limit for values of Cx and Rx :
Cx : NO LIMIT
Rx : VCC < 3.0 V 5 K Ω to 1 M Ω
VCC ≥ 3.0 V 1 K Ω to 1 M Ω
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
NC =
No Internal
Connection
October 1993
1/14
M54/M74HC423/423A
FUNCTIONAL DESCRIPTION (continued)
RE-TRIGGERED OPERATION
When a second trigger pulse follows the first its
effect will depend on the state of the multivibrator. If
the capacitor Cx is being charged the voltage level
of R/C external falls to Vrefl again and Q remains
high i.e. the retrigger pulse arrives in a time shorter
than the period Rx ⋅ Cx seconds, the capacitor
charging time constant. If the second trigger pulse
is very close to the initial trigger pulse it is ineffective
; i.e. the second trigger must arrive in the capacitor
discharge cycle to be ineffective; Hence the
minimum time for a second trigger to be effective
depends on VCC and Cx.
RESET OPERATION
CL is normally high. If CL is low, the trigger is not
effective because Q output goes low and trigger
control flip-flop is reset.
Also transistor Op is turned on and Cx is charged
quicky to VCC. This means if CL input goes low, the
IC becomes waiting state both in operating and non
operating state.
TRUTH TABLE
INPUTS
AB
H
XL
HX
L
XX
X: Don’t Care Z: High Impedance
CL
H
H
H
H
L
OUTPUTS
QQ
LH
LH
LH
NOTE
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
INHIBIT
INPUT AND OUTPUT EQUIVALENT CIRCUIT
4/14
4페이지 M54/M74HC423/423A
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC
(V)
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
Value
-40 to 85 oC
74HC
Min. Max.
-55 to 125 oC
54HC
Min. Max.
Unit
tTLH Output Transition 2.0
tTHL Time
4.5
30 75
8 15
95
19
ns
6.0
7 13
16
tPLH Propagation
tPHL Delay Time
(A, B - Q, Q)
2.0
4.5
6.0
102 210
29 42
22 36
265
53
45
ns
tPLH Propagation
tPHL Delay Time
(CLR - Q, Q)
2.0
4.5
6.0
68 160
20 32
16 27
200
40
34
ns
tWOUT
Output Pulse
Width
(for HC423)
2.0 CX = 100 pF
4.5 RX = 10 KΩ
6.0
1.3
1.1
1
µs
2.0 CX = 0.1 µF
4.5 RX = 100 KΩ
4.8
4.6
ms
6.0 4.5
tWOUT
Output Pulse
Width
(for HC423A)
2.0 CX = 100 pF
4.5 RX = 10 KΩ
6.0
1.7
1.4
1.3
µs
2.0 CX = 0.1 µF
4.5 RX = 100 KΩ
10
9.5
ms
6.0 9.5
∆tWOUT
Output Pulse
Width Error
Between Circuits
in Same Package
±1
%
tW(H)
tW(L)
Minimum Pulse
Width
2.0
4.5
75 95
15 19
ns
6.0 13 16
tW(L) Minimum Pulse
Width
2.0
4.5
75 95
15 19
ns
6.0 13 16
trr Minimum
2.0 CX = 100 pF
Retrigger Time 4.5 RX = 1 KΩ
325
108
ns
6.0 78
2.0 CX = 0.1 µF
4.5 RX = 100 KΩ
5
1.4
µs
6.0 1.2
CIN Input Capacitance
5 10 10 10 pF
CPD (*) Power Dissipation
Capacitance
160
pF
(*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(RefertoTestCircuit). Average operting current canbeobtained by the following equation. ICC(opr) =CPD •VCC •fIN +ICC’ Duty/100 + IC/2 (per monostable)
(ICC’: Active Supply Current) (Duty:%)
7/14
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부품번호 | 상세설명 및 기능 | 제조사 |
M74HC42 | BCD TO DECIMAL DECODER | ST Microelectronics |
M74HC423 | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR | ST Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |