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HC123 の電気的特性と機能

HC123のメーカーはSTMicroelectronicsです、この部品の機能は「DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR」です。


製品の詳細 ( Datasheet PDF )

部品番号 HC123
部品説明 DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
メーカ STMicroelectronics
ロゴ STMicroelectronics ロゴ 




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HC123 Datasheet, HC123 PDF,ピン配置, 機能
M54HC123/123A
M74HC123/123A
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 = 200 µA (TYP.) 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
54/74LS123
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
DESCRIPTION
The M54/74HC123 is a high speed CMOS MONO-
STABLE multivibrator fabricated with silicon gate
C2MOS technology. It achieves the high speed
operation similar to equivalent LSTTL while main-
taining the CMOS low power dissipation. There are
two trigger inputs, A INPUT (negative edge) and 8
INPUT (positive edge). These inputs are valid for
slow rising/falling signals, (tr = tf = I sec). The device
may also be triggered by using the CLR input (posi-
tive-edge) because of the Schmitt-trigger input ;
after triggering the output maintains the MONO-
STABLE state for the time period determined by the
external resistor Rx and capacitor Cx. When Cx
10nF and Rx 10K, the output pulse width value
is approssimatively given by the formula: tw(out) = K
Cx Rx.
Two different pulse width constant are available:
K 0.45 for HC123 K 1 for HC123A.
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 to 1 M
VCC 3.0 V 1 K to 1 M
All inputs are equipped with protection circuits
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
October 1993
1/14

1 Page





HC123 pdf, ピン配列
BLOCK DIAGRAM
M54/M74HC123/123A
Note :
(1) Cx, Rx, Dx are external components.
(2) Dx is a clamping diode.
The external capacitor is charged to VCC inthe stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly
through an internal parasitic diode (see figures). If Cx is sufficiently large and VCC decreases rapidy, there will be some possibility of da-
maging the I.C. with a surge current or latch-up. If the voltage supply filter capacitor is large enough and VCC decrease slowly, the surge
current is automatically limited and damage the I.C. is avoided. The maximum forward current of the parasitic diode is approximately 20
mA. In cases where Cx is large the time taken for the supply voltage to fall to 0.4 VCC can be calculated as follows :
tf (VCC – 0.7) Cx/20mA
In cases where tf is too short an external clamping diode is required to protect the I.C. from the surge current.
FUNCTIONAL DESCRIPTION
STAND-BY STATE
The external capacitor, Cx, is fully charged to VCC
in the stand-by state. Hence, before triggering, tran-
sistor Qp and Qn (connected to the Rx/Cx node) are
both turned-off. The two comparators that control
the timing and the two reference voltage sources
stop operating. The total supply current is therefore
only leakage current.
TRIGGER OPERATION
Triggering occurs when :
1 st) A is ”low” and B has a falling edge ;
2 nd) B is ”high” and A has a rising edge ;
3 rd) A is low and B is high and C1 has a rising edge.
After the multivibrator has been retriggered com-
parator C1 and C2 start operating and Qn is turned
on. Cx then discharges through Qn. The voltage at
the node R/C external falls.
When it reaches VREFL the output of comparator C1
becomes low. This in turn resets the flip-flop and Qn
is turned off.
At this point C1 stops functioning but C2 continues
to operate.
The voltage at R/C external begins to rise with a time
constant set by the external components Rx, Cx.
Triggering the multivibrator causes Q to go high after
internal delay due to the flip-flop and the gate. Q re-
mains high until the voltage at R/C external rises
again to VREFH. At this point C2 output goes low and
O goes low. C2 stop operating. That means that
after triggering when the voltage R/C external re-
turns to VREFH the multivibrator has returned to its
MONOSTABLE STATE. In the case where Rx Cx
are large enough and the discharge time of the ca-
pacitor and the delay time in the I.C. can be ignored,
the width of the output pulse tw (out) is as follows :
tW(OUT) = 0.46 Cx Rx (HC123)
tW(OUT) = Cx Rx (HC123A)
3/14


3Pages


HC123 電子部品, 半導体
M54/M74HC123/123A
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
2 to 6
V
VI Input Voltage
0 to VCC
V
VO Output Voltage
Top Operating Temperature: M54HC Series
M74HC Series
0 to VCC
-55 to +125
-40 to +85
V
oC
oC
tr, tf Input Rise and Fall Time
0 to 1000
ns
0 to 500
CX External Capacitor
0 to 400
NO LIMITATION
pF
RX External Resistor
VCC < 3 V
5K to 1M
VCC 3 V
1K to 1M
(*) The maximum allowable values of Cx and Rx are a function of leakage of capacitor Cx, the leakage of device and leakage due to the board
layout and surface resistance. Susceptibility to externally induced noise may occur for Rx > 1M
DC SPECIFICATIONS
Symbol
Parameter
VIH High Level Input
Voltage
VIL Low Level Input
Voltage
VOH High Level
Output Voltage
VOL Low Level Output
Voltage
II Input Leakage
Current
II R/C Terminal Off
State Current
ICC Quiescent Supply
Current
ICC’ Active State
Supply Current (1)
(1): Per Circuit
Test Conditions
VCC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
VI =
VIH
IO=-20 µA
6.0 or
4.5 VIL IO=-4.0 mA
6.0 IO=-5.2 mA
2.0
4.5
VI =
VIH
IO= 20 µA
6.0 or
4.5 VIL IO= 4.0 mA
6.0 IO= 5.2 mA
6.0 VI = VCC or GND
6.0 VI = VCC or GND
6.0 VI = VCC or GND
2.0 VI = VCC or GND
4.5 Pin 7 or 15
6.0 VIN = VCC/2
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
1.5
3.15
4.2
0.5
1.35
1.8
1.9 2.0
4.4 4.5
5.9 6.0
4.18 4.31
5.68 5.8
0.0 0.1
0.0 0.1
0.0 0.1
0.17 0.26
0.18 0.26
±0.1
±0.1
4
45 200
500 600
0.7 1
Value
-40 to 85 oC
74HC
Min. Max.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
4.13
5.63
0.1
0.1
0.1
0.33
0.33
±1
±1
40
260
780
1.3
-55 to 125 oC
54HC
Min. Max.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
4.10
5.60
0.1
0.1
0.1
0.40
0.40
±1
±1
80
320
960
1.6
Unit
V
V
V
V
µA
µA
µA
µA
µA
mA
6/14

6 Page



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