Datasheet

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FEATURES

DPACKAGE

(TOP VIEW)

1CLR

ext

2R /C

ext ext

GND

1R /C

ext ext

ext

2CLR

DESCRIPTION/ORDERING INFORMATION

SN74AHC123A-EP

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

SCLS703A – JULY 2006 – REVISED MARCH 2007

• Controlled Baseline • Overriding Clear Terminates Output Pulse

– One Assembly Site • Glitch-Free Power-Up Reset On Outputs

– 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 – 2000-V Human-Body Model (A114-A)

• Enhanced Diminishing Manufacturing Sources – 200-V Machine Model (A115-A)

(DMS) Support

– 1000-V Charged-Device Model (C101)

• Enhanced Product-Change Notification

xxx

• Qualification Pedigree

(1)

• Operating Range 2-V to 5.5-V V

• Schmitt-Trigger Circuitry On A, B, and CLR

Inputs for Slow Input Transition Rates

• Edge Triggered From Active-High or

Active-Low Gated Logic Inputs

• Retriggerable for Long Output Pulses

(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,

electromigration, bond intermetallic life, and mold compound

life. Such qualification testing should not be viewed as

justifying use of this component beyond specified

xxx

performance and environmental limits.

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

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

ext

and R

ext

(positive) and an external resistor connected

between R

ext

and V

. To obtain variable pulse durations, connect an external variable resistance between

ext

and V

. 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.

Summary of content (17 pages)

PAGE 1
SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 FEATURES • • • • • • • • • (1) Controlled Baseline – One Assembly Site – One Test Site – One Fabrication Site Extended Temperature Performance of –55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) Operating Range 2-V to 5.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 DESCRIPTION/ORDERING INFORMATION (CONTINUED) During power up, Q outputs are in the low state and Q outputs are in the high state. The outputs are glitch free, without applying a reset pulse. For additional application information on multivibrators, see the application report Designing With the SN74AHC123A and SN74AHCT123A, literature number SCLA014.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 INPUT/OUTPUT TIMING DIAGRAM trr A B CLR Rext/Cext Q Q tw tw tw + trr Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage range (2) –0.5 7 V VI Input voltage range (3) –0.5 7 V –0.5 VCC + 0.5 V –0.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 Recommended Operating Conditions (1) VCC Supply voltage VIH High-level input voltage MIN MAX 2 5.5 VCC = 2 V 1.5 VCC = 3 V 2.1 VCC = 5.5 V UNIT V V 3.85 VCC = 2 V 0.5 VCC = 3 V 0.9 VIL Low-level input voltage VI Input voltage 0 5.5 VO Output voltage 0 VCC V –50 µA VCC = 5.5 V 1.
PAGE 5
SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 Timing Requirements over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER tw Pulse duration trr Pulse retirgger time (1) TEST CONDITIONS TA = 25°C MIN TYP MAX MIN CLR 5 5 A or B trigger 5 5 MAX UNIT ns Rext = 1 kΩ, Cext = 100 pF (1) 76 (1) ns Rext = 1 kΩ, Cext = 0.01 µF (1) 1.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 Switching Characteristics over recommended operating free-air temperature range, VCC = 5 V ± 0.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 APPLICATION INFORMATION Caution in Use To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the wiring between the external components and Cext and Rext/Cext terminals as short as possible.
PAGE 9
SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 APPLICATION INFORMATION (continued) Retriggering Data NOTE: Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. The minimum input retriggering time (tMIR) is the minimum time required after the initial signal before retriggering the input. After tMIR, the device retriggers the output.
PAGE 10
SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 APPLICATION INFORMATION (continued) NOTE: Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. 1.00E+09 VCC = 5 V TA = 25°C 1.00E+08 RT = 200k Ω t w − Output Pulse Duration − ns 1.00E+07 RT = 150k Ω 1.00E+06 RT = 80k Ω 1.00E+05 RT = 10k Ω 1.00E+04 RT = 5k Ω 1.00E+03 1.00E+02 RT = 1k Ω 1.00E+01 1.
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SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR www.ti.com SCLS703A – JULY 2006 – REVISED MARCH 2007 APPLICATION INFORMATION (continued) NOTE: Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. OUTPUT PULSE-DURATION CONSTANT vs SUPPLY VOLTAGE MINIMUM TRIGGER TIME vs VCC CHARACTERISTICS 10.00 1.20 Output Pulse-Duration Constant − K trr − Minimum Retrigger Time − µs RT = 1 kΩ TA = 25°C CT = 0.01 µF 1.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Nov-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN74AHC123AMDREP Package Package Pins Type Drawing SOIC D 16 SPQ Reel Reel Diameter Width (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) 6.5 10.3 2.1 8.0 W Pin1 (mm) Quadrant 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Nov-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN74AHC123AMDREP SOIC D 16 2500 333.2 345.9 28.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.