Datasheet > SN54LV123A_10

SN54LV123A_10

更新时间： 2024-11-27 09:17:43

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德州仪器 - TI		触发器输入元件
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描述
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

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SN54LV123A_10 数据手册

SN54LV123A, SN74LV123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

WITH SCHMITT-TRIGGER INPUTS

SCLS393O − APRIL 1998 − REVISED OCTOBER 2005

2-V to 5.5-V V Operation

Supports Partial-Power-Down Mode

off

Operation

Max t of 11 ns at 5 V

Retriggerable for Very Long Output Pulses,

up to 100% Duty Cycle

Typical V

(Output Ground Bounce)

OLP

<0.8 V at V = 3.3 V, T = 25°C

Overriding Clear Terminates Output Pulse

Glitch-Free Power-Up Reset on Outputs

Typical V

(Output V Undershoot)

OHV

>2.3 V at V = 3.3 V, T = 25°C

Support Mixed-Mode Voltage Operation on

All Ports

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

Schmitt-Trigger Circuitry on A, B, and CLR

Inputs for Slow Input Transition Rates

ESD Protection Exceeds JESD 22

− 2000-V Human-Body Model (A114-A)

− 200-V Machine Model (A115-A)

Edge Triggered From Active-High or

Active-Low Gated Logic Inputs

− 1000-V Charged-Device Model (C101)

SN74LV123A . . . RGY PACKAGE

(TOP VIEW)

SN54LV123A . . . FK PACKAGE

(TOP VIEW)

SN54LV123A . . . J OR W PACKAGE

SN74LV123A . . . D, DB, DGV, NS,

OR PW PACKAGE

(TOP VIEW)

1CLR

V_CC

1CLR

2C_ext

1R_ext/C_ext

1C_ext

2CLR

1R_ext/C_ext

1C_ext

1 20 19

1C_ext

1CLR

2C_ext

12 2Q

2C_ext

2R_ext/C_ext

GND

2CLR

15 2Q

9 10 11 12 13

2R_ext/C_ext

2CLR

NC − No internal connection

description/ordering information

The ’LV123A devices are dual retriggerable monostable multivibrators designed for 2-V to 5.5-V V operation.

These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method,

the A input is low and the B input goes high. In the second method, the B input is high and the A input goes low.

In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.

The output pulse duration is programmable by selecting external resistance and capacitance values. The

external timing capacitor must be connected between C and R /C (positive) and an external resistor

ext

ext ext

connected between R /C

and V . To obtain variable pulse durations, connect an external variable

ext ext

resistance between R /C and V . The output pulse duration also can be reduced by taking CLR low.

ext ext

Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input

pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition

rates with jitter-free triggering at the outputs.

Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or

high-level-active (B) input. Pulse duration can be reduced by taking CLR low. The input/output timing diagram

illustrates pulse control by retriggering the inputs and early clearing.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information current as of publication date. Products conform to

specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all

parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...27

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SN54LV123AFK	TI	获取价格	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LV123AFKR	TI	获取价格	暂无描述
SN54LV123AJ	TI	获取价格	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LV123AW	TI	获取价格	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
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