STMicroelectronics M74HC123AF1R Dual retriggerable monostable multivibrator Datasheet

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
DESCRIPTION
The M54/74HC123 is a high speed CMOS MONOSTABLE multivibrator fabricated with silicon gate
C2MOS technology. It achieves 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 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 (positive-edge) because of the Schmitt-trigger input ;
after triggering the output maintains the MONOSTABLE 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
VCC ≥ 3.0 V 1 K Ω to 1 M Ω
All inputs are equipped with protection circuits
October 1993
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R
M74HCXXXM1R
M74HCXXXB1R
M74HCXXXC1R
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
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.
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 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 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, 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
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 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.
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 remains 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 returns 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 capacitor 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
M54/M74HC123/123A
FUNCTIONAL DESCRIPTION (continued)
mum time for a second trigger to be effective depends on VCC and Cx.
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 mini-
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
OUTPUTS
B
CL
X
H
L
H
H
L
H
H
X
H
L
H
L
L
H
X
X
Q
H
L
X: Don’t Care Z: High Impedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
4/14
Q
NOTE
A
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
OUTPUT ENABLE
L
H
INHIBIT
M54/M74HC123/123A
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN No
SYMBOL
NAME AND FUNCTION
1, 9
1A, 2A
2, 10
1B, 2B
3, 11
1CLR,
2CLR
4, 12
1Q, 2Q
Trigger Inputs (Negative
Edge Triggered)
Trigger Inputs (Positive
Edge Triggered)
Direct Reset LOW and
Trigger Action at Positive
Edge
Outputs (Active LOW)
7
2REXT/CEXT
External Resistor
Capacitor Connection
13, 5
14, 6
1Q, 2Q
1CEXT
2CEXT
Outputs (Active HIGH)
External Capacitor
Connection
15
1REXT/CEXT
External Resistor
Capacitor Connection
8
GND
Ground (0V)
16
V CC
Positive Supply Voltage
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Unit
-0.5 to +7
V
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
V
V
DC Input Diode Current
DC Output Diode Current
± 20
± 20
mA
mA
DC Output Source Sink Current Per Output Pin
± 25
mA
± 50
500 (*)
mA
mW
VCC
Supply Voltage
VI
VO
DC Input Voltage
DC Output Voltage
IIK
IOK
IO
ICC or IGND
PD
Tstg
TL
DC VCC or Ground Current
Power Dissipation
Storage Temperature
Lead Temperature (10 sec)
-65 to +150
o
C
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the 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
Parameter
VCC
VI
Supply Voltage
Input Voltage
VO
Output Voltage
Top
Operating Temperature: M54HC Series
M74HC Series
Input Rise and Fall Time
tr, tf
Value
Unit
2 to 6
0 to VCC
V
V
0 to VCC
V
o
-55 to +125
-40 to +85
0 to 1000
C
C
ns
o
0 to 500
0 to 400
CX
External Capacitor
RX
External Resistor
NO LIMITATION
pF
VCC < 3 V
5K to 1M
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 leakage due to the board
layout and surface resistance. Susceptibility to externally induced noise may occur for Rx > 1MΩ
DC SPECIFICATIONS
Test Conditions
Symbol
VIH
V IL
V OH
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level
Output Voltage
VCC
(V)
Low Level Output
Voltage
2.0
1.5
1.5
1.5
3.15
4.2
3.15
4.2
3.15
4.2
0.5
0.5
0.5
4.5
6.0
1.35
1.8
1.35
1.8
1.35
1.8
2.0
4.5
6.0
6.0
2.0
4.5
4.5
6.0
II
Input Leakage
Current
R/C Terminal Off
State Current
6.0
6.0
2.0
1.9
1.9
4.4
5.9
4.5
6.0
4.4
5.9
4.4
5.9
4.18
4.31
4.13
4.10
5.68
5.8
0.0
0.1
0.1
0.1
0.0
0.1
0.1
0.1
0.0
0.1
0.1
0.1
0.17
0.26
0.33
0.40
0.18
0.26
±0.1
0.33
±1
0.40
±1
µA
VI = VCC or GND
±0.1
±1
±1
µA
4
40
80
µA
45
200
260
320
µA
500
0.7
600
1
780
1.3
960
1.6
µA
mA
IO=-5.2 mA
VI =
IO= 20 µA
VIH
or
V IL IO= 4.0 mA
IO= 5.2 mA
VI = VCC or GND
Quiescent Supply
Current
6.0
VI = VCC or GND
ICC’
Active State
Supply Current (1)
2.0
VI = VCC or GND
Pin 7 or 15
VIN = VCC/2
(1): Per Circuit
6/14
V
1.9
VI =
IO=-20 µA
VIH
or
V IL IO=-4.0 mA
ICC
4.5
6.0
Unit
V
2.0
6.0
II
Value
-40 to 85 oC -55 to 125 oC
74HC
54HC
Min. Max. Min. Max.
4.5
6.0
4.5
VOL
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
5.63
V
5.60
V
M54/M74HC123/123A
AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns)
Test Conditions
Symbol
Parameter
tTLH
tTHL
Output Transition
Time
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tWOUT
tWOUT
∆tWOUT
tW(H)
tW(L)
tW(L)
trr
CIN
CPD (*)
VCC
(V)
2.0
4.5
6.0
Propagation
2.0
Delay Time
4.5
(A, B - Q, Q)
6.0
Propagation
2.0
Delay Time
4.5
(CLRTRIGGER- Q,Q) 6.0
Propagation
2.0
Delay Time
4.5
(CLR - Q, Q)
6.0
Output Pulse
2.0
Width
4.5
(for HC123)
6.0
2.0
4.5
6.0
Output Pulse
2.0
Width
4.5
(for HC123A)
6.0
2.0
4.5
6.0
Output Pulse
Width Error
Between Circuits
in Same Package
Minimum Pulse
2.0
Width
4.5
6.0
Minimum Pulse
2.0
Width (CLR)
4.5
6.0
Minimum
2.0
Retrigger Time
4.5
6.0
2.0
4.5
6.0
Input Capacitance
Power Dissipation
Capacitance
CX = 100 pF
RX = 10 KΩ
CX = 0.1 µF
RX = 100 KΩ
CX = 100 pF
RX = 10 KΩ
CX = 0.1 µF
RX = 100 KΩ
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
30
75
8
15
7
13
102
210
29
42
22
36
102
235
31
47
23
40
68
160
20
32
16
27
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
Value
-40 to 85 oC -55 to 125 oC
74HC
54HC
Min. Max. Min. Max.
95
110
19
22
16
19
265
315
53
63
45
54
295
355
59
71
50
60
200
240
40
48
34
41
Unit
ns
ns
ns
ns
µs
ms
µs
ms
%
75
15
13
75
15
13
CX = 100 pF
RX = 1 KΩ
CX = 0.1 µF
RX = 100 KΩ
325
108
78
5
1.4
1.2
5
162
95
19
16
95
19
16
110
22
19
110
22
19
ns
ns
ns
µs
10
10
10
pF
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 thefollowing 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 SWITCHINGCHARACTERISTICS TESTS.
SWITCHING CHARACTERISTICS TEST WAVEFORM
9/14
M54/M74HC123/123A
Plastic DIP16 (0.25) MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
0.77
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
P001C
10/14
M54/M74HC123/123A
Ceramic DIP16/1 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
20
0.787
B
7
0.276
D
E
3.3
0.130
0.38
e3
0.015
17.78
0.700
F
2.29
2.79
0.090
0.110
G
0.4
0.55
0.016
0.022
H
1.17
1.52
0.046
0.060
L
0.22
0.31
0.009
0.012
M
0.51
1.27
0.020
0.050
N
P
Q
10.3
7.8
8.05
5.08
0.406
0.307
0.317
0.200
P053D
11/14
M54/M74HC123/123A
SO16 (Narrow) MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.004
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45° (typ.)
D
9.8
E
5.8
10
0.385
6.2
0.228
0.393
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8° (max.)
P013H
12/14
M54/M74HC123/123A
PLCC20 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
9.78
10.03
0.385
0.395
B
8.89
9.04
0.350
0.356
D
4.2
4.57
0.165
0.180
d1
2.54
0.100
d2
0.56
0.022
E
7.37
8.38
0.290
0.330
e
1.27
0.050
e3
5.08
0.200
F
0.38
0.015
G
0.101
0.004
M
1.27
0.050
M1
1.14
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. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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14/14
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