M74HC123AB1R [STMICROELECTRONICS]
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR; 双可重触发单稳多谐振荡器
| 型号： | M74HC123AB1R |
| 厂家： | 
ST |
| 描述： | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| 文件： | 总14页 (文件大小：293K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M54HC123/123A
M74HC123/123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
.
.
HIGH SPEED
tPD = 25 ns (TYP) at VCC = 5V
LOW POWER DISSIPATION
STANDBYSTATE ICC=4 µA (MAX.) AT TA=25°C
ACTIVESTATE ICC =200 µA (TYP.) AT VCC=5V
HIGH NOISE IMMUNITY
.
.
.
.
.
.
.
V
NIH = VNIL = 28 % VCC (MIN.)
B1R
F1R
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
(Plastic Package)
(Ceramic Package)
M1R
C1R
(Micro Package)
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R
M74HCXXXM1R
M74HCXXXB1R
M74HCXXXC1R
PIN CONNECTIONS (top view)
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 ≥ 10KΩ, 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 Ω to 1 M Ω
NC =
No Internal
Connection
VCC ≥ 3.0 V 1 K Ω to 1 M Ω
All inputs are equipped with protection circuits
October 1993
1/14
M54/M74HC123/123A
SYSTEM DIAGRAM
TIMING CHART
2/14
M54/M74HC123/123A
BLOCK DIAGRAM
Note :
(1) Cx, Rx, Dx are external components.
(2) Dx is a clamping diode.
Theexternal capacitor ischarged toVCC inthestand-by state, i.e. no trigger. When thesupply 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 somepossibility 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 canbe 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
When it reaches VREFL the output of comparator C1
becomes low.This in turn resets the flip-flop and Qn
is turned off.
STAND-BY STATE
The external capacitor, Cx, is fully charged to VCC
in the stand-by state. Hence, before triggering, tran-
sistorQp 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.
At this point C1 stops functioning but C2 continues
to operate.
Thevoltage atR/C external begins to rise witha time
constant set by the external components Rx, Cx.
Triggering the multivibrator causes Qto 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. Atthis 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-
pacitorand 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)
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 ishigh and C1 has a risingedge.
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.
tW(OUT) = Cx Rx (HC123A)
3/14
M54/M74HC123/123A
FUNCTIONAL DESCRIPTION (continued)
mum time for a second trigger to be effective de-
pends on VCC and Cx.
RE-TRIGGERED OPERATION
When a second trigger pulse follows the first its ef-
fect 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 itis ineffective
; i.e. the second trigger must arrive in the capacitor
discharge cycle to be ineffective; Hence the mini-
RESET OPERATION
CL is normally high. If CL is low, the trigger is not ef-
fective because Q output goes low and trigger con-
trol 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
OUTPUTS
NOTE
A
B
H
L
CL
H
Q
Q
OUTPUT ENABLE
X
H
L
H
L
L
H
H
INHIBIT
INHIBIT
X
H
H
OUTPUT ENABLE
OUTPUT ENABLE
INHIBIT
L
H
X
X
L
L
H
X: Don’t Care Z: High Impedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
4/14
M54/M74HC123/123A
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN No
SYMBOL
NAME AND FUNCTION
1, 9
1A, 2A
Trigger Inputs (Negative
Edge Triggered)
2, 10
3, 11
1B, 2B
Trigger Inputs (Positive
Edge Triggered)
1CLR,
2CLR
Direct Reset LOW and
Trigger Action at Positive
Edge
4, 12
7
1Q, 2Q
Outputs (Active LOW)
2REXT/CEXT External Resistor
Capacitor Connection
13, 5
14, 6
1Q, 2Q
Outputs (Active HIGH)
1CEXT
2CEXT
External Capacitor
Connection
15
1REXT/CEXT External Resistor
Capacitor Connection
8
GND
VCC
Ground (0V)
16
Positive Supply Voltage
ABSOLUTE MAXIMUM RATING
Symbol
VCC
VI
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
± 20
DC Input Voltage
V
VO
DC Output Voltage
V
IIK
DC Input Diode Current
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
mA
mA
mA
mA
mW
oC
IOK
± 20
IO
± 25
ICC or IGND DC VCC or Ground Current
± 50
PD
Tstg
TL
Power Dissipation
500 (*)
Storage Temperature
-65 to +150
Lead Temperature (10 sec)
300
oC
Absolute MaximumRatingsare those values beyond whichdamage tothe device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
5/14
M54/M74HC123/123A
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
2 to 6
Unit
V
Supply Voltage
Input Voltage
Output Voltage
0 to VCC
0 to VCC
V
VO
V
Top
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
oC
oC
tr, tf
Input Rise and Fall Time
0 to 1000
0 to 500
ns
0 to 400
pF
CX
RX
External Capacitor
External Resistor
NO LIMITATION
5K to 1M
VCC < 3 V
Ω
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 leakagedue to the board
layout and surface resistance. Susceptibility to externally induced noise may occur for Rx > 1MΩ
DC SPECIFICATIONS
Test Conditions
VCC
Value
TA = 25 oC
54HC and 74HC
-40 to 85 oC -55 to 125 oC
Symbol
Parameter
Unit
74HC
54HC
(V)
Min. Typ. Max. Min. Max. Min. Max.
VIH
High Level Input
Voltage
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
V
V
VIL
Low Level Input
Voltage
0.5
1.35
1.8
0.5
1.35
1.8
0.5
1.35
1.8
VOH
High Level
Output Voltage
1.9
4.4
5.9
2.0
4.5
6.0
1.9
4.4
1.9
4.4
VI =
VIH
or
IO=-20 µA
V
V
5.9
5.9
VIL
IO=-4.0 mA 4.18 4.31
4.13
5.63
4.10
5.60
IO=-5.2 mA 5.68
5.8
0.0
0.0
0.0
VOL
Low Level Output 2.0
Voltage
0.1
0.1
0.1
0.1
0.1
0.1
0.1
VI =
VIH
or
IO= 20 µA
4.5
6.0
4.5
6.0
0.1
0.1
VIL
IO= 4.0 mA
IO= 5.2 mA
0.17 0.26
0.18 0.26
±0.1
0.33
0.33
±1
0.40
0.40
±1
II
II
Input Leakage
6.0
VI = VCC or GND
µA
µA
µA
Current
R/C Terminal Off
6.0
VI = VCC or GND
±0.1
±1
±1
State Current
ICC
Quiescent Supply 6.0 VI = VCC or GND
Current
4
40
80
ICC
’
Active State
Supply Current (1)
2.0 VI = VCC or GND
45
500
0.7
200
600
1
260
780
1.3
320
960
1.6
µA
µA
Pin 7 or 15
4.5
VIN = VCC/2
6.0
mA
(1):Per Circuit
6/14
M54/M74HC123/123A
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Test Conditions
Value
-40 to 85 oC -55 to 125 oC
74HC 54HC
TA = 25 oC
54HC and 74HC
Symbol
Parameter
Unit
VCC
(V)
Min. Typ. Max. Min. Max. Min. Max.
tTLH
tTHL
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
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
ns
ns
ns
ns
µs
ms
µs
ms
7
13
16
19
tPLH
tPHL
Propagation
Delay Time
(A, B - Q, Q)
102
29
210
42
265
53
315
63
22
36
45
54
tPLH
tPHL
Propagation
Delay Time
(CLR TRIGGER - Q, Q)
102
31
235
47
295
59
355
71
23
40
50
60
tPLH
tPHL
Propagation
Delay Time
(CLR - Q, Q)
68
160
32
200
40
240
48
20
16
27
34
41
tWOUT
Output Pulse
Width
(for HC123)
CX = 100 pF
RX = 10 KΩ
1.4
1.2
1.1
4.6
4.4
4.3
1.9
1.6
1.5
9.8
9.5
9.4
±1
CX = 0.1 µF
RX = 100 KΩ
tWOUT
Output Pulse
Width
(for HC123A)
CX = 100 pF
RX = 10 KΩ
CX = 0.1 µF
RX = 100 KΩ
∆tWOUT Output Pulse
Width Error
%
ns
ns
ns
µs
Between Circuits
in Same Package
tW(H)
tW(L)
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
19
tW(L)
Minimum Pulse
Width (CLR)
110
22
19
trr
Minimum
Retrigger Time
CX = 100 pF
RX = 1 KΩ
325
108
78
CX = 0.1 µF
RX = 100 KΩ
5
1.4
1.2
5
CIN
Input Capacitance
10
10
10
pF
pF
CPD (*) Power Dissipation
Capacitance
162
(*) CPD isdefined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(RefertoTestCircuit).Average opertingcurrent canbeobtained bythefollowing equation. ICC(opr)=CPD •VCC •fIN +ICC’ Duty/100 +IC/2(per monostable)
(ICC’: Active Supply Current) (Duty:%)
7/14
M54/M74HC123/123A
Output Pulse Width Constant Characteristics
(for HC123)
Output Pulse Width Constant Characteristics
(for HC123A)
Output Pulse Width Characteristics (for HC123)
Output Pulse Width Characteristics (for HC123A)
8/14
M54/M74HC123/123A
TEST CIRCUIT ICC (Opr)
* TRANSITION TIME OF INPUT WAVEFORM IS THE SAME AS
THAT IN SASE OF SWITCHINGCHARACTERISTICSTESTS.
SWITCHING CHARACTERISTICS TEST WAVEFORM
9/14
M54/M74HC123/123A
Plastic DIP16 (0.25) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.51
0.77
TYP.
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
10/14
M54/M74HC123/123A
Ceramic DIP16/1 MECHANICAL DATA
mm
inch
DIM.
MIN.
TYP.
MAX.
20
MIN.
TYP.
MAX.
0.787
0.276
A
B
7
D
E
3.3
0.130
0.700
0.38
0.015
e3
F
17.78
2.29
0.4
2.79
0.55
1.52
0.31
1.27
10.3
8.05
5.08
0.090
0.016
0.046
0.009
0.020
0.110
0.022
0.060
0.012
0.050
0.406
0.317
0.200
G
H
L
1.17
0.22
0.51
M
N
P
7.8
0.307
Q
P053D
11/14
M54/M74HC123/123A
SO16 (Narrow) 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
0.004
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.)
P013H
12/14
M54/M74HC123/123A
PLCC20 MECHANICAL DATA
mm
inch
DIM.
MIN.
9.78
8.89
4.2
TYP.
MAX.
10.03
9.04
MIN.
0.385
0.350
0.165
TYP.
MAX.
0.395
0.356
0.180
A
B
D
4.57
d1
d2
E
2.54
0.56
0.100
0.022
7.37
8.38
0.290
0.330
0.004
e
1.27
5.08
0.38
0.050
0.200
0.015
e3
F
G
0.101
M
M1
1.27
1.14
0.050
0.045
P027A
13/14
M54/M74HC123/123A
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsare notauthorized foruse ascritical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
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14/14
相关型号：
M74HC123M1
HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, MICRO, PLASTIC, SOP-16
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