Datasheet > SN74AHC123AMDREPG4

SN74AHC123AMDREPG4

更新时间： 2024-11-04 12:22:47

品牌	Logo	应用领域
德州仪器 - TI		振荡器
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17页	426K
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DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

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SN74AHC123A-EP

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

www.ti.com

SCLS703A–JULY 2006–REVISED MARCH 2007

FEATURES

•

Controlled Baseline

•

Overriding Clear Terminates Output Pulse

Glitch-Free Power-Up Reset On Outputs

–

One Assembly Site

One Test Site

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

One Fabrication Site

•

ESD Protection Exceeds JESD 22

•

Extended Temperature Performance of –55°C

to 125°C

–

xxx

2000-V Human-Body Model (A114-A)

200-V Machine Model (A115-A)

Enhanced Diminishing Manufacturing Sources

(DMS) Support

1000-V Charged-Device Model (C101)

•

Enhanced Product-Change Notification

(1)

Qualification Pedigree

D PACKAGE

(TOP VIEW)

Operating Range 2-V to 5.5-V V_CC

Schmitt-Trigger Circuitry On A, B, and CLR

Inputs for Slow Input Transition Rates

V_CC

1R_ext/C_ext

•

Edge Triggered From Active-High or

Active-Low Gated Logic Inputs

1CLR

14 1C_ext

Retriggerable for Long Output Pulses

12 2Q

(1) Component qualification in accordance with JEDEC and

industry standards to ensure reliable operation over an

extended temperature range. This includes, but is not limited

to, Highly Accelerated Stress Test (HAST) or biased 85/85,

temperature cycle, autoclave or unbiased HAST,

2C_ext

2R_ext/C_ext

GND

2CLR

electromigration, bond intermetallic life, and mold compound

life. Such qualification testing should not be viewed as

justifying use of this component beyond specified

performance and environmental limits.

xxx

DESCRIPTION/ORDERING INFORMATION

The SN74AHC123A device is a dual retriggerable monostable multivibrator designed for 2-V to 5.5-V V_CC

operation.

This edge-triggered multivibrator features 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 programmed by selecting external resistance and capacitance values. The external

timing capacitor must be connected between C_extand R_ext/C_ext(positive) and an external resistor connected

between R_ext/C_extand V_CC. To obtain variable pulse durations, connect an external variable resistance between

R_ext/C_extand V_CC. The output pulse duration can be reduced by taking CLR low.

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. CLR can be used to override A or

B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early clearing.

The variance in output pulse duration from device to device is less than ±0.5% (typ) for given external timing

components. An example of this distribution for the SN74AHC123A is shown in Figure 10. Variations in output

pulse duration versus supply voltage and temperature are shown in Figure 6.

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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...17

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SN74AHC123AMDREPG4 替代型号

型号	品牌	替代类型	描述	数据表
SN74AHC123AMDREP	TI	完全替代	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

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