STMicroelectronics M54HC4538K Rad hard dual retriggerable monostable multivibrator Datasheet

M54HC4538
RAD HARD DUAL RETRIGGERABLE
MONOSTABLE MULTIVIBRATOR
■
■
■
■
■
■
■
■
■
HIGH SPEED:
tPD = 25 ns (TYP.) at VCC = 6V
LOW POWER DISSIPATION:
STAND BY STATE:
ICC=4µA (MAX.) at TA=25°C
ACTIVE STATE:
ICC=200µA (TYP.) at VCC = 6V
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
WIDE OUTPUT PULSE WIDTH RANGE:
tWOUT = 120 ns ~ 60 s OVER AT VCC = 4.5 V
PIN AND FUNCTION COMPATIBLE WITH
54 SERIES 4538
DEVICE FULLY COMPLIANT WITH
SCC-9207-008
DESCRIPTION
The M54HC4538 is an high speed CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C2MOS technology.
Each multivibrator features both a negative A, and
a positive B, edge triggered input, either of which
can be used as an inhibit input. Also included is a
DILC-16
FPC-16
ORDER CODES
PACKAGE
FM
EM
DILC
FPC
M54HC4538D
M54HC4538K
M54HC4538D1
M54HC4538K1
clear input that when taken low resets the one
shot.
The
monostable
multivibrator
are
retriggerable. That is, they may be triggered
repeatedly while their outputs are generating a
pulse and the pulse will be extended. Pulse width
stability over a wide range of temperature and
supply is achieved using linear CMOS techniques.
The output pulse equation is simply:
PW = 0.7 (R)(C) where PW is in seconds, R in
Ohms and C is in Farads.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION
June 2004
Rev. 1
1/13
M54HC4538
Figure 1: IEC Logic Symbols
Figure 2: Input And Output Equivalent Circuit
Table 1: Pin Description
PIN N°
SYMBOL
1, 15
1T1, 2T1
2, 14
1T2, 2T2
3, 13
1CD, 2CD
4, 12
1A, 2A
5, 11
1B, 2B
6, 10
Q1, Q2
7, 9
Q1, Q2
8
GND
VCC
16
NAME AND FUNCTION
External Capacitor Connections
External Resistor/
Capacitor Connections
Direct Reset Inputs
(Active Low)
Trigger Inputs (LOW to
HIGH, Edge-Triggered)
Trigger Inputs (HIGH to
LOW, Edge Triggered)
Pulse Outputs
Complementary Pulse
Outputs
Ground (0V)
Positive Supply Voltage
Table 2: TRUTH TABLE
INPUTS
OUTPUTS
NOTE
A
X
H
B
CD
H
H
L
X
H
H
L
X
X : Don’t Care
2/13
Q
Q
OUTPUT ENABLE
L
L
H
H
L
H
H
X
L
INHIBIT
INHIBIT
OUTPUT ENABLE
INHIBIT
M54HC4538
Figure 3: System Diagram
This logic diagram has not be used to estimate propagation delays
Figure 4: Timing Chart
3/13
M54HC4538
Figure 5: 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:
tf > (VCC - 0.7) x 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;
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 Rx/Cx external falls.
When it reaches VREFL the output of comparator
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.
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 G goes low. C2 stop
4/13
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) = 0.72 Cx · Rx
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 Rx/Cx 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, trr (MIN.) depends on VCC and Cx
RESET OPERATION
CD is normally high. If CD 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
quickly to VCC. This means if CD input goes low
the IC becomes waiting state both in operating
and non operating state.
M54HC4538
Table 3: Absolute Maximum Ratings
Symbol
VCC
Parameter
Supply Voltage
Value
Unit
-0.5 to +7
V
VI
DC Input Voltage
-0.5 to VCC + 0.5
V
VO
DC Output Voltage
-0.5 to VCC + 0.5
± 20
V
mA
± 20
mA
IIK
DC Input Diode Current
IOK
DC Output Diode Current
IO
DC Output Current
ICC or IGND DC VCC or Ground Current
Power Dissipation
PD
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
± 25
mA
± 50
mA
300
mW
-65 to +150
°C
265
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
Table 4: Recommended Operating Conditions
Symbol
VCC
Parameter
Supply Voltage
Value
Unit
2 to 6
V
VI
Input Voltage
0 to VCC
V
VO
Output Voltage
0 to VCC
V
Top
Operating Temperature
Input Rise and Fall Time (CD only)
tr, tf
-55 to 125
°C
VCC = 2.0V
0 to 1000
ns
VCC = 4.5V
0 to 500
ns
VCC = 6.0V
Cx
Rx
External Capacitor
External Resistor
0 to 400
ns
NO LIMITATION
pF
VCC < 3V
5K to 1M
VCC > 3V
1K to 1M
Ω
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
5/13
M54HC4538
Table 5: DC Specifications
Test Condition
Symbol
VIH
VIL
VOH
VOL
II
II
ICC
ICC
6/13
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
Input Leakage
Current
Quiescent Supply
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
Typ.
Max.
1.5
3.15
4.2
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Unit
V
0.5
1.35
1.8
2.0
IO=-20 µA
1.9
2.0
1.9
1.9
4.5
IO=-20 µA
4.4
4.5
4.4
4.4
6.0
IO=-20 µA
5.9
6.0
5.9
5.9
4.5
IO=-4.0 mA
4.18
4.31
4.13
4.10
6.0
IO=-5.2 mA
5.68
5.8
5.63
5.60
2.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=20 µA
0.0
0.1
0.1
0.1
V
V
6.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=4.0 mA
0.17
0.26
0.33
0.40
6.0
IO=5.2 mA
0.18
0.26
0.33
0.40
6.0
VI = VCC or GND
± 0.1
±1
±1
µA
6.0
VI = VCC or GND
Rext/Cext
± 0.1
±1
±1
µA
6.0
VI = VCC or GND
4
40
80
µA
2.0
4.5
6.0
VI = VCC or GND
Pin 2 or 14
VIN = VCC/2
120
0.3
0.6
160
0.4
0.8
200
0.6
1.0
µA
mA
mA
40
0.2
0.3
V
M54HC4538
Table 6: AC Electrical Characteristics (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Symbol
Parameter
tTLH tTHL Output Transition
Time
tPLH tPHL Propagation Delay
Time
(A, B - Q, Q)
tPLH tPHL Propagation Delay
Time
(CD - Q, Q)
tWOUT
∆tWOUT
tW(H)
tW(L)
tW(L)
tREM
trr
Output Pulse Width
Output Pulse Width
Error Between
Circuits in Same
Package
Minimum Pulse
Width
(A,B)
Minimum Pulse
Width
(CD)
Minimum Clear
Removal Time
Minimum Retrigger
Time
TA = 25°C
VCC
(V)
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
Value
Cx=0
Min.
Typ.
Max.
70
69
69
0.67
0.67
0.67
30
8
7
120
30
25
100
25
20
540
180
150
83
77
77
0.75
0.73
0.73
75
15
13
250
50
43
195
39
33
1200
250
200
96
85
85
0.83
0.77
0.77
Rx = 5KΩ
Rx = 1KΩ
Rx= 1KΩ
Cx = 0.01µF
Rx = 10KΩ
Cx = 0.1µF
Rx = 10KΩ
-40 to 85°C
-55 to 125°C
Min.
Max.
Min.
Max.
70
69
69
0.67
0.67
0.67
95
19
16
315
63
54
245
49
42
1500
320
260
96
85
85
0.83
0.77
0.77
70
69
69
0.67
0.67
0.67
110
22
19
375
75
64
295
59
50
1800
375
320
96
85
85
0.9
0.8
0.8
±1
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
Cx = 0.1 µF
Rx = 1KΩ
Cx = 0.01µF
Rx = 1KΩ
30
8
7
30
8
7
0
0
0
380
92
72
6
1.4
1.2
Unit
ns
ns
ns
ns
µs
ms
%
75
15
13
75
15
13
15
5
5
95
19
16
95
19
16
15
5
5
110
22
19
110
22
19
20
7
ns
ns
ns
ns
µs
7/13
M54HC4538
Table 7: Capacitive Characteristics
Test Condition
Symbol
Parameter
VCC
(V)
Value
TA = 25°C
Min.
Typ.
Max.
10
CIN
Input Capacitance
5.0
5
CPD
Power Dissipation
Capacitance (note
1)
5.0
70
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
10
Unit
Max.
10
pF
pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC ’ Duty/100
+ IC/2(per monostable) (Icc’: Active Supply current) (Duty:%)
Figure 6: Test Circuit
CL = 50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
8/13
M54HC4538
Figure 7: Switching Characteristics Test Waveform (f=1MHz; 50% duty cycle)
9/13
M54HC4538
DILC-16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
2.1
2.71
0.083
0.107
a1
3.00
3.70
0.118
0.146
a2
0.63
1.14
0.025
B
1.82
2.39
0.072
b
0.40
0.45
0.50
0.016
0.018
0.020
b1
0.20
0.254
0.30
0.008
0.010
0.012
D
20.06
20.32
20.58
0.790
0.800
0.810
E
7.36
7.62
7.87
0.290
0.300
0.310
e
0.88
2.54
0.035
0.045
0.094
0.100
e1
17.65
17.78
17.90
0.695
0.700
0.705
e2
7.62
7.87
8.12
0.300
0.310
0.320
F
7.29
7.49
7.70
0.287
0.295
0.303
I
3.83
0.151
K
10.90
12.1
0.429
0.476
L
1.14
1.5
0.045
0.059
0056437F
10/13
M54HC4538
FPC-16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
6.75
6.91
7.06
0.266
0.272
0.278
B
9.76
9.94
10.14
0.384
0.392
0.399
C
1.49
1.95
0.059
D
0.102
0.127
0.152
0.004
0.005
0.006
E
8.76
8.89
9.01
0.345
0.350
0.355
F
0.077
1.27
G
0.38
H
6.0
L
18.75
M
0.33
0.050
0.43
0.48
0.015
0.017
0.019
0.237
0.38
N
22.0
0.738
0.43
0.013
0.867
0.015
4.31
0.017
0.170
G
F
D
H
9
16
A
N
L
8
1
H
E
B
M
C
0016030E
11/13
M54HC4538
Table 8: Revision History
Date
Revision
16-Jun-2004
1
12/13
Description of Changes
First Release
M54HC4538
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13/13
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