PHILIPS 74LV423N

INTEGRATED CIRCUITS
74LV423
Dual retriggerable monostable
multivibrator with reset
Product specification
IC24 Data Handbook
1997 Feb 04
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
FEATURES
74LV423
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 74LV423 is a low-voltage Si-gate CMOS device and is pin and
function compatible with the 74HC/HCT423.
The 74LV423 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 2 and 3 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 6. 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
CL = 15pF
VCC = 3.3V
REXT = 5KΩ
CEXT = 0pF
Propagation delay
nA, nB to nQ, nQ
nRD to nQ, nQ
tPHL/tPLH
CONDITIONS
CI
Input capacitance
CPD
Power dissipation capacitance per flip-flop
VCC = 3.3V, VI = GND to VCC1
TYPICAL
UNIT
16
13
ns
ns
3.5
pF
17
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 capacity 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
74LV423 N
74LV423 N
SOT38-1
16-Pin Plastic SO
–40°C to +125°C
74LV423 D
74LV423 D
SOT109-1
16-Pin Plastic SSOP Type II
–40°C to +125°C
74LV423 DB
74LV423 DB
SOT338-1
16-Pin Plastic TSSOP Type I
–40°C to +125°C
74LV423 PW
74LV423PW DH
SOT403-1
1997 Feb 04
2
853–1913 17724
Philips Semiconductors
Preliminary 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
2A
SYMBOL
1,9
1A, 2A
Trigger inputs
(negative-edge triggered)
2,10
1B, 2B
Trigger inputs
(positive-edge triggered)
1Q, 2Q
7
2REXT/CEXT
8
GND
13, 5
1Q, 2Q
14, 6
1CEXT,
2CEXT
15
1REXT/CEXT
16
VCC
2REXT/CEXT
7
1Q
13
2Q
1
1A
5
9
2A
2
1B
10
2B
T
Q
12
3
1RD
11
2RD
SV00160
Direct reset LOW
FUNCTIONAL DIAGRAM
Outputs (active LOW)
External resistor/capacitor connection
1CEXT
14
2CEXT
6
1REXT/CEXT
15
2REXT/CEXT
7
1Q
13
2Q
5
Ground (0V)
Outputs (active HIGH)
External capacitor connection
External resistor/capacitor connection
S
Positive supply voltage
LOGIC SYMBOL (IEEE/IEC)
1
1A
9
2A
2
1B
10
2B
T
Q
15
4
2Q
FUNCTION
Q
14
1Q
RD
PIN
NUMBER
1RD, 2RD
15
Q
PIN DESCRIPTION
3,11
6
1REXT/CEXT
S
SV00096
4, 12
14
2CEXT
1REXT/CEXT
3
8
1CEXT
VCC
1RD
GND
74LV423
CX
1Q
4
2Q
12
RCX
13
1
RD
&
2
4
3
3
1RD
11
2RD
R
SV00162
6
7
CX
RCX
5
9
&
10
12
11
R
SV00161
1997 Feb 04
3
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
LOGIC DIAGRAM
nREXT/CEXT
VCC
Q
RD
Q
R
R
CL VCC
CL
VCC
R
CL
CL
CL
A
B
It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND)
SV00163
FUNCTION TABLE
INPUTS
nRD
OUTPUTS
nA
nB
nQ
VCC
nQ
L
X
X
L
H
X
H
X
L*
H*
X
X
L
L*
H*
H
L
↑
H
↓
H
REXT
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
CEXT
to nCEXT
(pin 14 or 6)
to nREXT/CEXT
(pin 15 or 7)
SV00101
Figure 1. Timing Component Connection
1997 Feb 04
4
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
PARAMETER
SYMBOL
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
– bus driver outputs
–0.5V < VO < VCC + 0.5V
25
35
mA
50
70
mA
–65 to +150
°C
IGND,
ICC
Tstg
PTOT
DC VCC or GND current for types with
– standard outputs
– bus driver outputs
Storage temperature range
Power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
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
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.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
VCC
PARAMETER
DC supply voltage
CONDITIONS
MIN
TYP
MAX
UNIT
See Note 1
1.2
3.3
5.5
V
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 per device
–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.
1997 Feb 04
5
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
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
VO
OL
VOL
O
II
IOZ
ICC
ICC
∆ICC
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
0.3
0.3
0.6
0.6
VCC = 2.7 to 3.6V
0.8
0.8
0.3VCC
0.3VCC
V
1.2
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
HIGH level output
g
voltage;
STANDARD
outputs
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
HIGH level output
voltage; BUS driver
outputs
VCC = 3.0V; VI = VIH or VIL; –IO = 8mA
2.40
2.82
2.20
VCC = 4.5V; VI = VIH or VIL; –IO = 16mA
3.60
4.20
3.50
l
l output
t t
LOW level
voltage
out uts
voltage; all outputs
V
VCC = 2.0V
VCC = 2.0V; VI = VIH or VIL; –IO = 100µA
HIGH level
l
l output
t t
voltage
out uts
voltage; all outputs
UNIT
MAX
VCC = 1.2V
V
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
V
LOW level output
voltage;
g
STANDARD
outputs
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
LOW level output
voltage; BUS driver
outputs
VCC = 3.0V; VI = VIH or VIL; IO = 8mA
0.20
0.40
0.50
VCC = 4.5V; VI = VIH or VIL; IO = 16mA
0.35
0.55
0.65
1.0
1.0
µA
5
10
µA
V
V
Input leakage
current
VCC = 5.5V; VI = VCC or GND
3-State output
OFF-state current
VCC = 5.5V; VI = VIH or VIL;
VO = VCC or GND
Quiescent supply
current; SSI
VCC = 5.5V; VI = VCC or GND; IO = 0
20.0
40
Quiescent supply
current; flip-flops
VCC = 5.5V; VI = VCC or GND; IO = 0
20.0
80
Quiescent supply
current; MSI
VCC = 5.5V; VI = VCC or GND; IO = 0
20.0
160
Quiescent supply
current; LSI
VCC = 5.5V; VI = VCC or GND; IO = 0
500
1000
Additional
quiescent supply
current
VCC = 2.7V to 3.6V; VI = VCC – 0.6V
500
850
µA
µA
NOTE:
1. All typical values are measured at Tamb = 25°C.
1997 Feb 04
MIN
0.9
VCC = 1.2V; VI = VIH or VIL; –IO = 100µA
VOH
O
MAX
VCC = 1.2V
VCC = 4.5 to 5.5
VOH
–40°C to +125°C
6
µA
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL = 1KΩ
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 4
CEXT = 0pF
REXT = 5kΩ
Figure 4
CEXT = 0pF
REXT = 5kΩ
Figure 4
CEXT = 0pF
REXT = 5kΩ
Figure 4
CEXT = 0pF
REXT = 5kΩ
Figure 4
Figure 4
Figure 3
LIMITS
CONDITION
–40 to +85 °C
MIN
TYP1
–40 to +125 °C
MAX
MIN
MAX
1.2
150
2.0
51
95
116
2.7
38
70
85
3.0 to 3.6
302
56
68
4.5 to 5.5
203
38
45
1.2
150
2.0
51
95
116
2.7
38
70
85
3.0 to 3.6
302
56
68
4.5 to 5.5
203
38
45
1.2
120
2.0
41
77
92
2.7
30
56
68
3.0 to 3.6
242
45
54
4.5 to 5.5
183
34
41
1.2
120
2.0
41
77
92
2.7
30
56
68
3.0 to 3.6
242
45
54
4.5 to 5.5
183
34
ns
ns
ns
ns
41
2.0
30
40
2.7
25
30
3.0 to 3.6
20
25
4.5 to 5.5
15
20
2.0
30
40
2.7
25
3.0 to 3.6
20
4.5 to 5.5
15
2.0
36
30
62
UNIT
25
ns
ns
20
2.7
30
40
3.0 to 3.6
25
30
4.5 to 5.5
20
25
ns
2.0
tW
Output pulse width
nQ = HIGH
nQ
Q = LOW
Figures 2
2, 3
2.7
3.0 to 3.6
4502
µs
4.5 to 5.5
2.0
tW
Output pulse width
nQ = HIGH
nQ
Q = LOW
Figures 2
2, 3
2.7
3.0 to 3.6
752
ns
4.5 to 5.5
2.0
trtt
Retrigger
gg time
nA, nB
Figure 2
2.7
3.0 to 3.6
4.5 to 5.5
NOTES ON FOLLOWING PAGE
1997 Feb 04
7
302
ns
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
AC CHARACTERISTICS (Continued)
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL = 1KΩ
SYMBOL
REXT
PARAMETER
External timing
resistor
LIMITS
CONDITION
WAVEFORM
–40 to +85 °C
TYP1
–40 to +125 °C
VCC(V)
MIN
1.2
20
1000
2.0
5
1000
2.7
5
1000
3.0 to 3.6
2
1000
4.5 to 5.5
2
1000
Figure 6
MAX
MIN
UNIT
MAX
kΩ
2.0
CEXT
External timing
g
capacitor
2.7
Figure 63
No limits
3.0 to 3.6
pF
F
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 6.
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:
= 30 + 0.19R x C-9 + 13 x R1.05 (typ.)
trt
= 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
SV00139
SV00164
Figure 2. Output pulse control using retrigger pulse;
nRD = HIGH.
1997 Feb 04
Figure 3. Output pulse control using reset input nRD;
nA = LOW.
8
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
nB INPUT
(nA LOW)
74LV423
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 4. Waveforms showing the input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times,
and the input and output pulse widths.
1997 Feb 04
9
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
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 7.
‘K’ factor
CX
RX
VCC
0.4
nCEXT
nREXT/CEXT
Q
“423”
A
B
Q
0
0
1
2
4
3
6
5
VCC (V)
SV00185
RESET
Figure 5. HCT typical “k” factor as a function of VCC;
CX = 10 nF; RX = 10 kW to 100 kW.
VCC
SV00166
106
Figure 7. Power-up output pulse elimination circuit
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 power-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, use a damping diode (DX) preferably a germanium or
Schottky type diode able to withstand large current surges and
connect as shown in Figure 8.
105
50kW
104
tW
ns
10kW
103
2kW
DX
102
0
1
10
102
103
104
VCC
CEXT (pF)
CX
RX
SV00141
Figure 6. Typical output pulse width as a function of the
external capacitor values at VCC = 3.3V and Tamb = 25°C.
nREXT/CEXT
SV00154
Figure 8. Power-down protection circuit
1997 Feb 04
10
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
TEST CIRCUIT
S1
VCC
2 VCC
Open
GND
RL
VO
VI
PULSE
GENERATOR
D.U.T.
RT
CL
RL
Test Circuit for switching times
DEFINITIONS
SWITCH POSITION
TEST
S1
tPLH/tPHL
Open
tPLZ/tPZL
2 VCC
tPHZ/tPZH
GND
VI
RL = Load resistor; see AC CHARACTERISTICS for value.
< 2.7V
VCC
CL = Load capacitance includes jig and probe capacitance:
See AC CHARACTERISTICS for value.
2.7–3.6V
2.7V
4.5V
VCC
VCC
RT = Termination resistance should be equal to ZOUT of
pulse generators.
SV00755
Figure 9. Load circuitry for switching times
1997 Feb 04
11
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
DIP16: plastic dual in-line package; 16 leads (300 mil); long body
1997 Feb 04
12
74LV423
SOT38-1
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
SO16: plastic small outline package; 16 leads; body width 3.9 mm
1997 Feb 04
13
74LV423
SOT109-1
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
1997 Feb 04
14
74LV423
SOT338-1
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
1997 Feb 04
15
74LV423
SOT403-1
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator
with reset
74LV423
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.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
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 1997
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
1997 Feb 04
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