数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

SN74LS221DBR 数据表(PDF) 2 Page - Texas Instruments

Click here to check the latest version.
部件名 SN74LS221DBR
功能描述  DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUT
Download  27 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74LS221DBR 数据表(HTML) 2 Page - Texas Instruments

  SN74LS221DBR Datasheet HTML 1Page - Texas Instruments SN74LS221DBR Datasheet HTML 2Page - Texas Instruments SN74LS221DBR Datasheet HTML 3Page - Texas Instruments SN74LS221DBR Datasheet HTML 4Page - Texas Instruments SN74LS221DBR Datasheet HTML 5Page - Texas Instruments SN74LS221DBR Datasheet HTML 6Page - Texas Instruments SN74LS221DBR Datasheet HTML 7Page - Texas Instruments SN74LS221DBR Datasheet HTML 8Page - Texas Instruments SN74LS221DBR Datasheet HTML 9Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 2 / 27 page
background image
SN54221, SN54LS221, SN74221, SN74LS221
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITT TRIGGER INPUTS
SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input
pulse. Schmitt-trigger input circuitry (TTL hysteresis) for B input allows jitter-free triggering from inputs with
transition at rates as slow as 1 V/s, providing the circuit with excellent noise immunity, typically of 1.2 V. A high
immunity to VCC noise, typically of 1.5 V, also is provided by internal latching circuitry.
Once fired, the outputs are independent of further transitions of the A and B inputs and are a function of the timing
components, or the output pulses can be terminated by the overriding clear. Input pulses can be of any duration
relative to the output pulse. Output pulse length can be varied from 35 ns to the maximum by choosing
appropriate timing components. With Rext = 2 kΩ and Cext = 0, an output pulse typically of 30 ns is achieved
that can be used as a dc-triggered reset signal. Output rise and fall times are TTL compatible and independent
of pulse length. Typical triggering and clearing sequences are shown as a part of the switching characteristics
waveforms.
Pulse-width stability is achieved through internal compensation and is virtually independent of VCC and
temperature. In most applications, pulse stability is limited only by the accuracy of external timing components.
Jitter-free operation is maintained over the full temperature and VCC ranges for more than six decades of timing
capacitance (10 pF to 10
µF) and more than one decade of timing resistance (2 kΩ to 30 kΩ for the SN54221,
2 k
Ω to 40 kΩ for the SN74221, 2 kΩ to 70 kΩ for the SN54LS221, and 2 kΩ to 100 kΩ for the SN74LS221).
Throughout these ranges, pulse width is defined by the relationship: tw(out) = CextRext In2 ≈ 0.7 CextRext. In
circuits where pulse cutoff is not critical, timing capacitance up to 1000
µF and timing resistance as low as 1.4 kΩ
can be used. Also, the range of jitter-free output pulse widths is extended if VCC is held to 5 V and free-air
temperature is 25
°C. Duty cycles as high as 90% are achieved when using maximum recommended RT. Higher
duty cycles are available if a certain amount of pulse-width jitter is allowed.
The variance in output pulse width from device to device typically is less than
±0.5% for given external timing
components. An example of this distribution for the ’221 is shown in Figure 3. Variations in output pulse width
versus supply voltage and temperature for the ’221 are shown in Figures 4 and 5, respectively.
Pin assignments for these devices are identical to those of the SN54123/SN74123 or SN54LS123/SN74LS123
so that the ’221 or ’LS221 devices can be substituted for those products in systems not using the retrigger by
merely changing the value of Rext and/or Cext; however, the polarity of the capacitor must be changed.
FUNCTION TABLE
(each monostable multivibrator)
INPUTS
OUTPUTS
CLR
A
B
Q
Q
L
X
X
L
H
X
HX
L
H
X
XL
L
H
H
L
H
H
↑‡
L
H
† Pulsed-output patterns are tested during
AC switching at 25
°C with Rext = 2 kΩ, and
Cext = 80 pF.
‡ This condition is true only if the output of
the latch formed by the two NAND gates
has been conditioned to the logic 1 state
prior to CLR going high. This latch is
conditioned by taking either A high or
B low while CLR is inactive (high).


类似零件编号 - SN74LS221DBR

制造商部件名数据表功能描述
logo
Texas Instruments
SN74LS221DBR TI-SN74LS221DBR Datasheet
208Kb / 23P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN74LS221DBR TI-SN74LS221DBR Datasheet
761Kb / 25P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN74LS221DBR TI-SN74LS221DBR Datasheet
902Kb / 26P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATPORS WITH SCHMITT-TRIGGER INPUTS
SN74LS221DBR TI-SN74LS221DBR Datasheet
963Kb / 27P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN74LS221DBRE4 TI-SN74LS221DBRE4 Datasheet
208Kb / 23P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
More results

类似说明 - SN74LS221DBR

制造商部件名数据表功能描述
logo
Hitachi Semiconductor
HD74HC221 HITACHI-HD74HC221 Datasheet
53Kb / 8P
   Dual Monostable Multivibrators (with Schmitt Trigger Input)
logo
Renesas Technology Corp
HD74HC221 RENESAS-HD74HC221 Datasheet
103Kb / 8P
   Dual Monostable Multivibrators (with Schmitt Trigger Input)
logo
Texas Instruments
SN54LV221A TI-SN54LV221A_08 Datasheet
718Kb / 23P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
logo
Motorola, Inc
SN54LS221 MOTOROLA-SN54LS221 Datasheet
193Kb / 7P
   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
logo
Texas Instruments
SN74221J TI-SN74221J Datasheet
963Kb / 27P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54221 TI-SN54221 Datasheet
208Kb / 23P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LV221A TI-SN54LV221A Datasheet
443Kb / 19P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LV221A TI-SN54LV221A_07 Datasheet
577Kb / 22P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN74LV221A TI-SN74LV221A Datasheet
436Kb / 19P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT TRIGGER INPUTS
SN54221 TI-SN54221_07 Datasheet
761Kb / 25P
[Old version datasheet]   DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com