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74AHC123A; 74AHCT123A
General description
The 74AHC123A; 74AHCT123A are high-speed Si-gate CMOS devices and are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The 74AHC123A; 74AHCT123A are dual retriggerable monostable multivibrators with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). The external resistor and capacitor are normally connected as shown in Figure 11.
Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering.
An internal connection from nRD to the input gate makes it possible to trigger the circuit by a positive-going signal at input nRD as shown in Table 3. Figure 8 and Figure 9 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the value of the external timing components REXT and CEXT. When CEXT ≥ 10 nF, the typical output pulse width is defined as: tW = REXT x CEXT where tW = pulse width in ns; REXT = external resistor in kOhm; CEXT = external capacitor in pF. Schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and fall times. The 74AHC123A; 74AHCT123A is identical to the 74AHC423; 74AHCT423 but can be triggered via the reset input.
Features
- All inputs have a Schmitt-trigger action
- Inputs accept voltages higher than VCC
- DC triggered from active HIGH or active LOW inputs
- Retriggerable for very long pulses up to 100 pct duty factor
- Direct reset terminates output pulse
- For 74AHC123A only: operates with CMOS input levels
- For 74AHCT123A only: operates with TTL input levels
- ESD protection:
- HBM JESD22-A114E exceeds 2000 V
- MM JESD22-A115-A exceeds 200 V
- CDM JESD22-C101C exceeds 1000 V
- Multiple package options
- Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74AHC123ABQ | 74AHC123ABQ-G | 9352 854 24115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74AHC123ABQ
| |
| 74AHC123AD | 74AHC123AD | 9352 655 63112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHC123AD
| week 35, 2004 |
| 74AHC123AD | 74AHC123AD-T | 9352 655 63118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC123AD
| week 35, 2004 |
| 74AHC123APW | 74AHC123APW | 9352 655 64112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHC123APW
| week 10, 2005 |
| 74AHC123APW | 74AHC123APW-T | 9352 655 64118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC123APW
| week 10, 2005 |
| 74AHCT123ABQ | 74AHCT123ABQ-G | 9352 854 25115 | Volume production | SOT763-1
(DHVQFN16) | Reel Pack, SMD, 7" | Standard Marking | 74AHCT123ABQ
| |
| 74AHCT123AD | 74AHCT123AD | 9352 655 61112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHCT123AD
| week 5, 2005 |
| 74AHCT123AD | 74AHCT123AD-T | 9352 655 61118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT123AD
| week 5, 2005 |
| 74AHCT123APW | 74AHCT123APW | 9352 655 62112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHCT123APW
| week 10, 2005 |
| 74AHCT123APW | 74AHCT123APW-T | 9352 655 62118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT123APW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74AHC123ABQ | 9352 854 24115 | Order samples | ||||||
| 74AHC123AD | 9352 655 63112 | 0.2600 | Order samples | |||||
| 74AHC123AD | 9352 655 63118 | 0.2600 | Order samples | |||||
| 74AHC123APW | 9352 655 64112 | 0.2600 | Order samples | |||||
| 74AHC123APW | 9352 655 64118 | 0.2600 | NA | AVNET ELECTRONICS MARKETING | 27,500 | 7/3/2008 | Buy online | Order samples |
| NA | ARROW ELECTRONICS | 15,000 | 7/3/2008 | Buy online | ||||
| NA | FUTURE ELECTRONICS | 1,500 | 7/3/2008 | Buy online | ||||
| 74AHCT123ABQ | 9352 854 25115 | Order samples | ||||||
| 74AHCT123AD | 9352 655 61112 | NA | AVNET ELECTRONICS MARKETING | 3,900 | 7/3/2008 | Buy online | not available | |
| 74AHCT123AD | 9352 655 61118 | 0.3000 | Order samples | |||||
| 74AHCT123APW | 9352 655 62112 | 0.3200 | not available | |||||
| 74AHCT123APW | 9352 655 62118 | 0.3200 | NA | AVNET ELECTRONICS MARKETING | 7,500 | 7/3/2008 | Buy online | Order samples |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74AHC123AD | SOT109-1
(SO16) | Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input | 5.1@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHC123APW | SOT403-1
(TSSOP16) | Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input | 5.1@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHCT123AD | SOT109-1
(SO16) | Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input; TTL Enabled | 5 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
| 74AHCT123APW | SOT403-1
(TSSOP16) | Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input; TTL Enabled | 5 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
Similar products
74AHC123A; 74AHCT123A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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