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PDF ( 数据手册 , 数据表 ) 74LV123

零件编号 74LV123
描述 Dual retriggerable monostable multivibrator with reset
制造商 Philips
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74LV123 数据手册, 描述, 功能
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







74LV123 pdf, 数据表
Philips Semiconductors
Dual retriggerable monostable multivibrator
with reset
Product specification
74LV123
AC CHARACTERISTICS (Continued)
GND = 0V; tr = tf 2.5ns; CL = 50pF; RL =1 K
SYMBOL
PARAMETER
WAVEFORM
CONDITION
LIMITS
–40 to +85°C
VCC(V)
1.2
MIN TYP MAX
10 1000
REXT
External timing
resistor
Figure 5
2.0
2.7
3.0 to 3.6
5
3
2
1000
1000
1000
4.5 to 5.5
2
1000
1.2
CEXT
External timing
capacitor
Figure 53
2.0
2.7
3.0 to 3.6
No limits
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 K; 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.)
where, trt = retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in K.
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.
–40 to +125°C
MIN MAX
AC WAVEFORMS
VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V; VOL and
VOH are the typical output voltage drop that occur with the output
load.
UNIT
ΚΩ
pF
nB INPUT
nA INPUT
tW
trt tW
nQ OUTPUT
tW
tW
tW
SV00139
Figure 1.Output pulse control using retrigger pulse;
nRD = HIGH.
nB INPUT
nRD INPUT
nQ OUTPUT
tW
tW
tW
SV00140
Figure 2.Output pulse control using reset input nRD;
nA = LOW.
1998 Apr 28
8







74LV123 equivalent, schematic
Philips Semiconductors
Dual retriggerable monostable multivibrator
with reset
Product specification
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.
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.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
© Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code
Document order number:
Date of release: 05-96
9397-750-04418
Philips
Semiconductors
1998 Apr 28
16










页数 16 页
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