PHILIPS 74LV123DB

INTEGRATED CIRCUITS
74LV123
Dual retriggerable monostable
multivibrator with reset
Product specification
Supersedes data of 1997 Feb 04
IC24 Data Handbook
1998 Apr 20
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
FEATURES
74LV123
DESCRIPTION
• Optimized for Low Voltage applications: 1.0 to 5.5V
• Accepts TTL input levels between VCC = 2.7V and VCC = 3.6V
• Typical VOLP (output ground bounce) 0.8V @ VCC = 3.3V,
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and
function compatible with the 74HC/HCT123.
The 74LV123 is a dual retriggerable monostable multivibrator with
output pulse width control by three methods. The basic pulse time is
programmed by selection of an external resistor (REXT) and
capacitor (CEXT). They are normally connected as shown in
Figure 1. Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge input
(nA) or the active HIGH-going edge input (nB). By repeating this
process, the output pulse period (nQ = HIGH, nQ = LOW) can be
made as long as desired. Alternatively, an output delay can be
terminated at any time by a LOW-going edge on input nRD, which
also inhibits the triggering. Figures 1 and 2 illustrate pulse control by
retriggering and early reset. The basic output pulse width is
essentially determined by the values of the external timing
components REXT and CEXT. For pulse width when CEXT <10000pF,
see Figure 5. When CEXT 10,000pF, the typical output pulse
width is defined as: tW = 0.45 REXT CEXT (typ.), where
tW = pulse width in ns; REXT = external resistor in KΩ; and
CEXT = external capacitor in pF. Schmitt-trigger action in the nA and
nB inputs makes the circuit highly tolerant of slower input rise and
fall times.
Tamb = 25°C
• Typical VOHV (output VOH undershoot) 2V @ VCC = 3.3V,
Tamb = 25°C
• DC triggered from active HIGH or active LOW inputs
• Retriggerable for very long pulses up to 100% duty factor
• Direct reset terminates output pulses
• Schmitt-trigger action on all inputs except for the reset input
• Output capability: standard (except for nREXT/CEXT)
• ICC category: MSI
QUICK REFERENCE DATA
GND = 0V; Tamb = 25°C; tr = tf 2.5 ns
SYMBOL
PARAMETER
CONDITIONS
CL = 15pF
VCC = 3.3V
REXT = 5KΩ
CEXT = 0pF
tPHL/tPLH
Propagation delay
nA, nB to nQ, nQ
nRD to nQ, nQ
CI
Input capacitance
CPD
Power dissipation capacitance per monostable
VCC = 3.3V, VI = GND to VCC1
TYPICAL
UNIT
25
20
ns
ns
3.5
pF
60
pF
NOTES:
1. CPD is used to determine the dynamic power dissipation (PD in µW)
PD = CPD VCC2 fi (CL VCC2 fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
(CL VCC2 fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
PKG. DWG. #
16-Pin Plastic DIL
–40°C to +125°C
74LV123 N
74LV123 N
SOT38-1
16-Pin Plastic SO
–40°C to +125°C
74LV123 D
74LV123 D
SOT109-1
16-Pin Plastic SSOP Type II
–40°C to +125°C
74LV123 DB
74LV123 DB
SOT338-1
16-Pin Plastic TSSOP Type I
–40°C to +125°C
74LV123 PW
74LV123PW DH
SOT403-1
1998 Apr 28
2
853–1911 19290
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
PIN CONFIGURATION
1A
1B
LOGIC SYMBOL
16
1
15
2
14
1CEXT
1Q
4
13
1Q
2Q
5
12
2Q
2CEXT
6
11
2RD
2REXT/CEXT
7
10
2B
9
1,9
1A, 2A
2,10
1B, 2B
3,11
1RD, 2RD
4, 12
1Q, 2Q
7
2REXT/CEXT
15
2REXT/CEXT
7
1Q
13
2Q
5
Q
2A
PIN DESCRIPTION
SYMBOL
6
1REXT/CEXT
S
SV00096
PIN
NUMBER
1
1A
9
2A
2
1B
10
2B
T
Q
Trigger inputs
(negative-edge triggered)
3
1RD
11
2RD
Trigger inputs
(positive-edge triggered)
4
2Q
12
SV00097
Direct reset LOW and trigger action at
positive edge
FUNCTIONAL DIAGRAM
Outputs (active LOW)
1CEXT
14
2CEXT
6
1REXT/CEXT
15
2REXT/CEXT
7
1Q
13
2Q
5
External resistor/capacitor connection
GND
13, 5
1Q, 2Q
Outputs (active HIGH)
14, 6
1CEXT,
2CEXT
External capacitor connection
15
1REXT/CEXT
16
VCC
Ground (0V)
S
External resistor/capacitor connection
Positive supply voltage
Q
LOGIC SYMBOL (IEEE/IEC)
15
1Q
RD
FUNCTION
8
14
14
2CEXT
1REXT/CEXT
3
8
1CEXT
VCC
1RD
GND
74LV123
CX
RCX
1
1A
9
2A
2
1B
10
2B
T
Q
1Q
4
2Q
12
13
1
&
RD
2
4
3
6
7
R
RCX
5
&
10
12
R
SV00098
1998 Apr 28
1RD
2RD
SV00099
CX
9
11
3
11
3
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
LOGIC DIAGRAM
nREXT/CEXT
VCC
Q
RD
Q
R
R
CL VCC
CL
VCC
R
CL
CL
CL
A
B
R
It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND)
SV00100
FUNCTION TABLE
INPUTS
nRD
VCC
OUTPUTS
nA
nB
nQ
nQ
L
X
X
L
H
X
H
X
L*
H*
L*
H*
X
X
L
H
L
↑
H
↓
H
↑
L
H
REXT
CEXT
NOTES:
* If the monostable was triggered before this condition was
established, the pulse will continue as programmed.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH transition
↓ = HIGH-to-LOW transition
= one HIGH level output pulse
= one LOW level output pulse
1998 Apr 28
to nCEXT
(pin 14 or 6)
to nREXT/CEXT
(pin 15 or 7)
SV00101
Figure 1.Timing component connection
4
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
RECOMMENDED OPERATING CONDITIONS
SYMBOL
VCC
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
See Note1
1.0
3.3
5.5
V
DC supply voltage
VI
Input voltage
0
–
VCC
V
VO
Output voltage
0
–
VCC
V
+85
+125
°C
500
200
100
50
ns/V
Tamb
Operating ambient temperature range in free
air
tr, tf
Input rise and fall times except for
Schmitt-trigger inputs
See DC and AC
characteristics
–40
–40
VCC = 1.0V to 2.0V
VCC = 2.0V to 2.7V
VCC = 2.7V to 3.6V
VCC = 3.6V to 5.5V
–
–
–
–
–
–
–
–
NOTE:
1. The LV is guaranteed to function down to VCC = 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
–0.5 to +7.0
V
VCC
DC supply voltage
IIK
DC input diode current
VI < –0.5 or VI > VCC + 0.5V
20
mA
IOK
DC output diode current
VO < –0.5 or VO > VCC + 0.5V
50
mA
IO
DC output source or sink current
– standard outputs
–0.5V < VO < VCC + 0.5V
25
IGND,
ICC
Tstg
PTOT
DC VCC or GND current for types with
– standard outputs
50
Storage temperature range
Power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
–65 to +150
for temperature range: –40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
750
500
500
mA
mA
°C
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 Apr 28
5
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0V).
LIMITS
SYMBOL
PARAMETER
-40°C to +85°C
TEST CONDITIONS
MIN
VIH
VIL
HIGH level Input
voltage
LOW level Input
voltage
TYP1
VOH
O
VOL
VOL
O
HIGH level output
voltage;
g
STANDARD
outputs
l
l output
t t
LOW level
voltage
out uts
voltage; all outputs
LOW level output
voltage;
g
STANDARD
outputs
MIN
0.9
0.9
VCC = 2.0V
1.4
1.4
VCC = 2.7 to 3.6V
2.0
2.0
VCC = 4.5 to 5.5V
0.7VCC
0.7VCC
UNIT
MAX
V
VCC = 1.2V
0.3
0.3
VCC = 2.0V
0.6
0.6
VCC = 2.7 to 3.6V
0.8
0.8
0.3VCC
0.3VCC
VCC = 1.2V; VI = VIH or VIL; –IO = 100µA
VOH
MAX
VCC = 1.2V
VCC = 4.5 to 5.5
HIGH level
l
l output
t t
voltage
out uts
voltage; all outputs
-40°C to +125°C
V
1.2
VCC = 2.0V; VI = VIH or VIL; –IO = 100µA
1.8
2.0
1.8
VCC = 2.7V; VI = VIH or VIL; –IO = 100µA
2.5
2.7
2.5
VCC = 3.0V; VI = VIH or VIL; –IO = 100µA
2.8
3.0
2.8
VCC = 4.5V; VI = VIH or VIL; –IO = 100µA
4.3
4.5
4.3
VCC = 3.0V; VI = VIH or VIL; –IO = 6mA
2.40
2.82
2.20
VCC = 4.5V; VI = VIH or VIL; –IO = 12mA
3.60
4.20
3.50
V
V
VCC = 1.2V; VI = VIH or VIL; IO = 100µA
0
VCC = 2.0V; VI = VIH or VIL; IO = 100µA
0
0.2
0.2
VCC = 2.7V; VI = VIH or VIL; IO = 100µA
0
0.2
0.2
VCC = 3.0V; VI = VIH or VIL; IO = 100µA
0
0.2
0.2
VCC = 4.5V; VI = VIH or VIL; IO = 100µA
0
0.2
0.2
VCC = 3.0V; VI = VIH or VIL; IO = 6mA
0.25
0.40
0.50
VCC = 4.5V; VI = VIH or VIL; IO = 12mA
0.35
0.55
0.65
V
V
Input leakage
current
VCC = 5.5V; VI = VCC or GND
1.0
1.0
µA
ICC
Quiescent supply
current; MSI
VCC = 5.5V; VI = VCC or GND; IO = 0
20.0
160
µA
∆ICC
Additional
quiescent supply
current
VCC = 2.7V to 3.6V; VI = VCC – 0.6V
500
850
µA
II
NOTES:
1. All typical values are measured at Tamb = 25°C.
1998 Apr 28
6
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL =1 KΩ
SYMBOL
PARAMETER
WAVEFORM
VCC(V)
tPHL
tPLH
tPHL
tPLH
tW
tW
tW
Propagation delay
nRD, nA, nB, to nQ
Propagation delay
nRD, nA, nB, to nQ
Propagation delay
nRD to nQ (reset)
Propagation delay
nRD to nQ (reset)
Trigger
gg pulse width
nA = LOW
Trigger
gg pulse width
nB = HIGH
Reset pulse width
nRD = LOW
Figure 3
CEXT = 0pF
REXT = 5KΩ
Figure 3
CEXT = 0pF
REXT = 5KΩ
Figure 3
CEXT = 0pF
REXT = 5KΩ
Figure 3
CEXT = 0pF
REXT = 5KΩ
Figure 3
Figure 3
Figure 2
tW
tW
trtt
1998 Apr 28
Output pulse width
nQ = HIGH
nQ
Q = LOW
Retrigger
gg time
nA, nB
Figures 1, 2
CEXT = 100nF
REXT = 10KΩ
Figures 1, 2
CEXT = 0
0pF
F
REXT = 5KΩ
Figure 1
CEXT = 0
0pF
F
REXT = 5KΩ
–40 to +85°C
MIN
TYP1
–40 to +125°C
MAX
MIN
120
2.0
40
76
92
2.7
30
56
68
3.0 to 3.6
252
48
57
4.5 to 5.5
182
40
46
1.2
120
2.0
40
76
92
2.7
30
56
68
3.0 to 3.6
252
48
57
4.5 to 5.5
182
40
46
1.2
100
2.0
30
57
68
2.7
23
43
51
3.0 to 3.6
202
38
45
4.5 to 5.5
142
31
36
1.2
100
2.0
30
57
68
2.7
23
43
51
3.0 to 3.6
202
38
45
4.5 to 5.5
142
31
2.0
30
ns
ns
ns
ns
36
5
40
2.7
25
3.5
30
3.0 to 3.6
20
3.02
25
4.5 to 5.5
15
2.52
20
2.0
30
13
40
2.7
25
8
30
3.0 to 3.6
20
72
25
4.5 to 5.5
15
52
20
2.0
35
6
45
2.7
30
5
40
3.0 to 3.6
25
42
30
4.5 to 5.5
20
32
25
ns
ns
ns
470
2.7
460
3.0 to 3.6
4502
4.5 to 5.5
4302
2.0
100
2.7
90
3.0 to 3.6
802
4.5 to 5.5
702
2.0
70
2.7
55
3.0 to 3.6
452
4.5 to 5.5
402
7
UNIT
MAX
1.2
2.0
Output pulse width
nQ = HIGH
nQ
Q = LOW
LIMITS
CONDITION
µs
ns
ns
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
AC CHARACTERISTICS (Continued)
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL =1 KΩ
SYMBOL
REXT
PARAMETER
External timing
resistor
LIMITS
CONDITION
WAVEFORM
–40 to +85°C
VCC(V)
MIN
1.2
10
1000
2.0
5
1000
2.7
3
1000
3.0 to 3.6
2
1000
4.5 to 5.5
2
1000
Figure 5
TYP
UNIT
–40 to +125°C
MAX
MIN
MAX
ΚΩ
1.2
2.0
CEXT
External timing
capacitor
ca
acitor
Figure
53
2.7
No limits
pF
3.0 to 3.6
4.5 to 5.5
NOTES:
1. Unless otherwise stated, all typical values are at Tamb = 25°C.
2. Typical value measured at VCC = 3.3V.
3. Typical value measured at VCC = 5.0V.
4. For other REXT and CEXT combinations see Figure 5.
if CEXT > 10 nF, the next formula is valid:
tW = K x REXT x CEXT (typ.)
where, tW = output pulse width in ns;
REXT = external resistor in KΩ; CEXT = external capacitor in pF;
K
= constant = 0.45 for VCC = 5.0V and 0.48 for VCC = 2.0V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT.
The output pulse width will only be extended when the time between the active-going edges of the
trigger pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0V) for the set-up time of a retrigger pulse is valid:
trt
= 30 + 0.19R x C-9 + 13 x R1.05 (typ.)
= retrigger time in ns;
where, trt
CEXT = external capacitor in pF;
REXT = external resistor in KΩ.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50pF.
AC WAVEFORMS
VM = 1.5V at VCC 2.7V; VM = 0.5 VCC at VCC 2.7V; VOL and
VOH are the typical output voltage drop that occur with the output
load.
nB INPUT
nB INPUT
tW
nA INPUT
nRD INPUT
trt
tW
tW
nQ OUTPUT
nQ OUTPUT
tW
tW
tW
tW
tW
SV00139
SV00140
Figure 1.Output pulse control using retrigger pulse;
nRD = HIGH.
1998 Apr 28
Figure 2.Output pulse control using reset input nRD;
nA = LOW.
8
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
nB INPUT
(nA LOW)
74LV123
VM
tW
nA INPUT
(nB HIGH)
tW
VM
nRD INPUT
tPLH
Q OUTPUT
tPLH
tW
VM
tTLH
tTHL
tPHL
tW
Q OUTPUT
tPLH
tW
VM
tTHL
tTLH
tPLH
tPHL
SV00197
Figure 3. Input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times,
and the input and output pulse widths.
1998 Apr 28
9
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
APPLICATION INFORMATION
0.8
Power-up considerations
When the monostable is powered-up it may produce an output
pulse, with a pulse width defined by the values of RX and CX. This
output pulse can be eliminated using the circuit shown in Figure 6.
‘K’ factor
CX
RX
VCC
0.4
nCEXT
nREXT/CEXT
Q
A
B
“123”
Q
0
0
2
1
4
3
6
5
VCC (V)
SV00185
RESET
VCC
Figure 4. HCT typical “k” factor as a function of VCC;
CX = 10 nF; RX = 10 KW to 100 KW.
SV00152
Figure 6. Power-up output pulse elimination circuit
106
REXT =
100kW
Power-down considerations
A large capacitor (CX) may cause problems when powering-down
the monostable due to the energy stored in this capacitor. When a
system containing this device is powered-down or a rapid decrease
of VCC to zero occurs, the monostable may sustain damage, due to
the capacitor discharging through the input protection diodes. To
avoid this possibility, connect a damping diode (DX) preferably a
germanium or Schottky type diode able to withstand large current
surges as shown in Figure 7.
105
50kW
104
tW
ns
10kW
103
2kW
DX
102
VCC
0
1
10
102
103
104
CX
CEXT (pF)
RX
SV00141
nREXT/CEXT
Figure 5.Typical output pulse width as a function of the
external capacitor values at VCC = 3.3V and Tamb = 25°C.
1998 Apr 28
SV00154
Figure 7. Power-down protection circuit
10
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
TEST CIRCUIT
Vcc
VO
Vl
PULSE
GENERATOR
D.U.T.
50pF
RT
RL= 1k
CL
Test Circuit for Outputs
DEFINITIONS
RL = Load resistor
CL = Load capacitance includes jig and probe capacitiance
RT = Termination resistance should be equal to ZOUT of pulse generators.
TEST
VCC
tPLH/tPHL
VI
< 2.7V
VCC
2.7–3.6V
2.7V
≥ 4.5 V
VCC
SV00902
Figure 8. Load circuitry for switching times
1998 Apr 28
11
74LV123
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
DIP16: plastic dual in-line package; 16 leads (300 mil); long body
1998 Apr 28
12
74LV123
SOT38-1
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
SO16: plastic small outline package; 16 leads; body width 3.9 mm
1998 Apr 28
13
74LV123
SOT109-1
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
1998 Apr 28
14
74LV123
SOT338-1
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
1998 Apr 28
15
74LV123
SOT403-1
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74LV123
DEFINITIONS
Data Sheet Identification
Product Status
Definition
Objective Specification
Formative or in Design
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
Preliminary Specification
Preproduction Product
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Product Specification
Full Production
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
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Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
 Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
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Document order number:
1998 Apr 28
16
Date of release: 05-96
9397-750-04418