M74HC123 [STMICROELECTRONICS]
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR; 双可重触发单稳多谐振荡器
| 型号： | M74HC123 |
| 厂家： | 
ST |
| 描述： | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| 文件： | 总12页 (文件大小：506K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M74HC123
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
■
■
HIGH SPEED :
t
= 23 ns (TYP.) at V = 6V
PD
CC
LOW POWER DISSIPATION:
STAND BY STATE :
I
=4µA (MAX.) at T =25°C
CC
A
ACTIVE STATE :
=200µA (MAX.) at V = 5V
I
DIP
SOP
TSSOP
T & R
CC
CC
■
■
■
■
■
■
HIGH NOISE IMMUNITY:
= V = 28 % V (MIN.)
V
NIH
NIL
CC
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 4mA (MIN)
ORDER CODES
PACKAGE
OH
OL
TUBE
BALANCED PROPAGATION DELAYS:
DIP
SOP
M74HC123B1R
M74HC123M1R
t
t
PLH
PHL
M74HC123RM13TR
M74HC123TTR
WIDE OPERATING VOLTAGE RANGE:
(OPR) = 2V to 6V
TSSOP
V
CC
WIDE OUTPUT PULSE WIDTH RANGE :
= 120 ns ~ 60 s OVER AT V = 4.5 V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 123
t
WOUT
CC
period determined by the external resistor Rx and
capacitor Cx. When Cx > 10nF and Rx > 10KΩ,
the output pulse width value is approsimatively
given by the formula : tW(OUT) = K · Cx · Rx.
(K 0.45).
DESCRIPTION
The M74HC123 is an high speed CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C MOS technology.
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
2
MONOSTABLE
period
it
makes
the
MONOSTABLE period longer. Limit for values of
Cx and Rx : Cx : NO LIMIT
There are two trigger inputs, A INPUT (negative
edge) and B INPUT (positive edge). These inputs
are valid for slow rising/falling signals, (tr=tf=l sec).
The device may also be triggered by using the
CLR input (positive-edge) because of the
Schmitt-trigger input; after triggering the output
maintains the MONOSTABLE state for the time
Rx : V < 3.0V 5KΩ to 1MΩ
cc
V
> 3.0V 1KΩ to 1MΩ
cc
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
1/12
M74HC123
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
Trigger Inputs (Negative
Edge Triggered)
1,9
1A, 2A
1B, 2B
Trigger Inputs (Positive
Edge Triggered)
2, 10
3, 11
Direct Reset LOW and
trigger Action at Positive
Edge
1 CLR
2 CLR
4, 12
7
1Q, 2Q
2R /C
Outputs (Active Low)
External Resistor
Capacitor Connection
X
X
13, 5
1Q, 2Q
Outputs (Active High)
1C
2C
External Capacitor
Connection
X
14, 6
15
X
External Resistor
Capacitor Connection
1R /C
X
X
8
GND
Vcc
Ground (0V)
16
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUTS
NOTE
A
B
CLR
Q
Q
H
H
OUTPUT ENABLE
X
H
L
H
H
L
L
H
H
INHIBIT
INHIBIT
X
L
L
H
OUTPUT ENABLE
H
X
OUTPUT ENABLE
INHIBIT
X
L
L
H
X : Don’t Care
2/12
M74HC123
SYSTEM DIAGRAM
This logic diagram has not be used to estimate propagation delays
TIMING CHART
3/12
M74HC123
BLOCK DIAGRAM
(1) Cx, Rx, Dx are external components.
(2) Dx is a clamping diode.
The external capacitor is charged to Vcc in the stand-by-state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly
trough an internal parasitic diode(see figures). If Cx is sufficiently large and Vcc decreases rapidly, there will be some possibility of damaging
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 to 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 :
t > (Vcc - 0.7) x Cx/20mA
f
In cases where t is too short an external clamping diode is required to protect the I.C. from the surge current.
f
FUNCTIONAL DESCRIPTION
STAND-BY STATE
output goes low and O goes low. C2 stop
operating. That means that after triggering when
the voltage R/C external returns to V the
multivibrator has returned to its MONOSTABLE
STATE. In the case where Rx · Cx are large
enough and the discharge time of the capacitor
and the delay time in the I.C. can be ignored, the
width of the output pulse tw (out) is as follows :
The external capacitor,Cx, is fully charged to Vcc
in the stand-by state. Hence, before triggering,
transistor 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
REFH
tW(OUT) = 0.45 Cx · Rx
RE - TRIGGERED OPERATION
Triggering occurs when :
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
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
comparator C1 and C2 start operating and Qn is
turned on. Cx then discharges through Qn. The
voltage at the node R/C external falls.
level of R/C external falls to V
again and Q
REFL
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
When it reaches V
the output of comparator
REFL
C1 becomes low. This in turn reset 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.
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.
Triggering the multivibrator causes Q to go high
after internal delay due to the flip-flop and the
gate. Q remains high until the voltage at R/C
Also transistor Op is turned on and Cx is charged
quickly to Vcc. This means if CL input goes low the
IC becomes waiting state both in operating and
non operating state.
external rises again to V
. At this point C2
REFH
4/12
M74HC123
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7
V
V
CC
V
DC Input Voltage
-0.5 to V + 0.5
I
CC
V
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5 to V + 0.5
V
O
CC
I
± 20
± 20
mA
mA
mA
mA
mW
°C
IK
I
OK
I
± 25
O
I
or I
DC V
or Ground Current
CC
± 50
CC
GND
P
Power Dissipation
500(*)
-65 to +150
300
D
T
Storage Temperature
Lead Temperature (10 sec)
stg
T
°C
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
Supply Voltage
2 to 6
0 to V
V
V
CC
V
Input Voltage
I
CC
V
Output Voltage
0 to V
CC
V
O
T
Operating Temperature
Input Rise and Fall Time
-55 to 125
0 to 1000
0 to 500
°C
ns
ns
ns
pF
op
V
V
V
= 2.0V
= 4.5V
= 6.0V
CC
CC
CC
t , t
r
f
0 to 400
NO LIMITATION
5K to 1M
Cx
Rx
External Capacitor
External Resistor
Vcc < 3V
Vcc > 3V
Ω
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 > 1MΩ
5/12
M74HC123
DC SPECIFICATIONS
Test Condition
Value
T
= 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
High Level Input
Voltage
2.0
4.5
6.0
2.0
4.5
6.0
2.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
IH
V
V
V
Low Level Input
Voltage
0.5
1.35
1.8
0.5
1.35
1.8
0.5
1.35
1.8
IL
V
High Level Output
Voltage
I =-20 µA
1.9
4.4
5.9
2.0
4.5
6.0
1.9
4.4
1.9
4.4
OH
O
I =-20 µA
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
O
I =-20 µA
5.9
5.9
V
V
O
I =-4.0 mA
4.18 4.31
4.13
5.63
4.10
5.60
O
I =-5.2 mA
5.68
5.8
0.0
0.0
0.0
O
V
Low Level Output
Voltage
I =20 µA
0.1
0.1
0.1
0.1
0.1
0.1
0.1
OL
O
I =20 µA
O
I =20 µA
0.1
0.1
O
I =4.0 mA
0.17 0.26
0.18 0.26
0.33
0.33
0.40
0.40
O
I =5.2 mA
O
I
Input Leakage
Current
I
V = V
or GND
6.0
6.0
± 0.1
± 1
± 1
µA
µA
I
CC
I
Quiescent Supply
Current
CC
V = V
or GND
or GND
4
40
80
I
CC
I
Active State
Supply Current (1)
2.0
4.5
6.0
45
500
0.7
200
600
1
260
780
1.3
320
960
1.6
µA
µA
V = V
CC’
I
CC
Pin 7 or 15
= V /2
V
IN
CC
mA
(1) : Per Circuit
6/12
M74HC123
AC ELECTRICAL CHARACTERISTICS (C = 50 pF, Input t = t = 6ns)
L
r
f
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
t
t
Output Transition
Time
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
30
8
75
15
95
19
110
22
TLH THL
ns
ns
ns
ns
µs
ms
7
13
16
19
t
t
t
t
Propagation Delay
Time
102
29
22
102
31
23
68
20
16
1.4
1.2
1.1
4.6
4.4
4.3
±1
210
42
265
53
315
63
PLH PHL
(A, B - Q, Q)
36
45
54
t
Propagation Delay
Time(CLR
TRIGGER - Q, Q)
235
47
295
59
355
71
PLH PHL
40
50
60
t
Propagation Delay
Time
160
32
200
40
240
48
PLH PHL
(CLR - Q, Q)
27
34
41
t
Output Pulse Width 2.0
WOUT
Cx = 100 pF
Rx = 10KΩ
4.5
6.0
2.0
4.5
6.0
Cx = 0.1µF
Rx = 100KΩ
∆t
Output Pulse Width
Error Between
Circuits in Same
Package
WOUT
%
t
t
Minimum Pulse
Width
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
75
15
13
75
15
13
95
19
16
95
19
16
110
22
W(H)
ns
ns
ns
µs
W(L)
W(L)
19
t
Minimum Pulse
Width (CLR)
110
22
19
t
Minimum Retrigger
Time
325
108
78
rr
Cx = 100 pF
Rx = 10KΩ
5
Cx = 0.1µF
Rx = 100KΩ
1.4
1.2
CAPACITIVE CHARACTERISTICS
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
C
Input Capacitance
5.0
5
10
10
10
pF
pF
IN
C
Power Dissipation
Capacitance (note
1)
PD
5.0
162
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= C x V x f + I ’ Duty/100
CC(opr)
PD CC IN CC
+ Ic/2(per monostable) (I ’ : Active Supply current) (Duty : %)
cc
7/12
M74HC123
TEST CIRCUIT
C
R
= 50pF or equivalent (includes jig and probe capacitance)
L
T
= Z
of pulse generator (typically 50Ω)
OUT
WAVEFORM : SWITCIHNG CHARACTERISTICS TEST WAVEFORM (f=1MHz; 50% duty cycle)
8/12
M74HC123
Plastic DIP-16 (0.25) MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
0.51
0.77
MAX.
MIN.
0.020
0.030
MAX.
a1
B
b
1.65
0.065
0.5
0.020
0.010
b1
D
E
e
0.25
20
0.787
8.5
2.54
17.78
0.335
0.100
0.700
e3
F
7.1
5.1
0.280
0.201
I
L
3.3
0.130
Z
1.27
0.050
P001C
9/12
M74HC123
SO-16 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.75
0.2
MIN.
MAX.
0.068
0.007
0.064
0.018
0.010
A
a1
a2
b
0.1
0.003
1.65
0.46
0.25
0.35
0.19
0.013
0.007
b1
C
0.5
0.019
c1
D
45° (typ.)
9.8
5.8
10
0.385
0.228
0.393
0.244
E
6.2
e
1.27
8.89
0.050
0.350
e3
F
3.8
4.6
0.5
4.0
5.3
0.149
0.181
0.019
0.157
0.208
0.050
0.024
G
L
1.27
0.62
M
S
8° (max.)
PO13H
10/12
M74HC123
TSSOP16 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
MAX.
0.047
0.006
0.041
0.012
0.0089
0.201
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
5.1
0.002
0.031
0.007
0.004
0.193
0.244
0.169
0.004
0.039
1
0.19
0.09
4.9
c
D
5
6.4
0.197
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0°
8°
0°
8°
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
c
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
11/12
M74HC123
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
© The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
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12/12
相关型号：
M74HC123M1
HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, MICRO, PLASTIC, SOP-16
STMICROELECTR
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