規格
| 屬性 | 價值 |
| Supplier | onsemi |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | 74VHC |
| Part Status | Active |
| Logic Type | Monostable |
| Independent Circuits | 2 |
| Schmitt Trigger Input | Yes |
| Propagation Delay | 8.1 ns |
| Current - Output High Low | 8mA, 8mA |
| Voltage - Supply | 2 V ~ 5.5 V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
概述
Description
74VHC123AMX is a dual retriggerable monostable multivibrator (two one-shot circuits) in the 74VHC CMOS family. Each channel is triggered by its A/B inputs and produces a single output pulse whose width is set by an external resistor and capacitor (RC timing network). It includes an asynchronous reset (MR) to cancel a pulse. The device is used for precise timing pulses, pulse stretching/debouncing, and edge-detection in digital circuits. AMX denotes TI’s packaging/grade variant for this 14-pin device (e.g., a SOIC/TSSOP package with a specific temperature range). Typical supply is around 4.5–5.5 V, with CMOS input compatibility. Check the datasheet for exact pinout, timing formulas, and package details.
Equivalent
Equivalent parts (dual retriggerable monostable, 74VHC family):
- SN74VHC123 (Texas Instruments)
- 74VHC123 (Nexperia, formerly NXP)
- MC74VHC123 (ON Semiconductor)
Other vendors may offer similar dual retriggerable monostable parts under their 74VHC/74VHC1G lines.
- SN74VHC123 (Texas Instruments)
- 74VHC123 (Nexperia, formerly NXP)
- MC74VHC123 (ON Semiconductor)
Other vendors may offer similar dual retriggerable monostable parts under their 74VHC/74VHC1G lines.
Features
- Dual retriggerable monostable (two one-shot circuits)
- Pulse width set by external resistor and capacitor (RC timing)
- Retriggerable: additional triggers extend the output pulse
- Asynchronous clear input per channel to force output low
- Independent channels with individual outputs
- Wide operating voltage: typically 2.0 V to 6.0 V (CMOS)
- CMOS/TTL-compatible input thresholds at standard logic levels
- High-speed CMOS with low static/dynamic power
- Available in AMX package (14-pin small-outline style)
Note: Exact trigger edge and output pin details are specified in the datasheet for the 74VHC123AMX.
- Pulse width set by external resistor and capacitor (RC timing)
- Retriggerable: additional triggers extend the output pulse
- Asynchronous clear input per channel to force output low
- Independent channels with individual outputs
- Wide operating voltage: typically 2.0 V to 6.0 V (CMOS)
- CMOS/TTL-compatible input thresholds at standard logic levels
- High-speed CMOS with low static/dynamic power
- Available in AMX package (14-pin small-outline style)
Note: Exact trigger edge and output pin details are specified in the datasheet for the 74VHC123AMX.
Pinout
- Pin count: 14 pins (DIP/SOIC 14, package variant AMX)
- Function: Dual retriggerable monostable multivibrator (two one-shot timing circuits) with asynchronous clear. Each half has trigger inputs and outputs Q and Q̅; pulse width is set by external RC network.
Used to generate precise timed pulses (two independent channels) with reset capability.
- Function: Dual retriggerable monostable multivibrator (two one-shot timing circuits) with asynchronous clear. Each half has trigger inputs and outputs Q and Q̅; pulse width is set by external RC network.
Used to generate precise timed pulses (two independent channels) with reset capability.
Manufacturer
- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and analog/digital integrated circuits used in a wide range of electronic products.
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and analog/digital integrated circuits used in a wide range of electronic products.
Application
74VHC123AMX is a dual retriggerable monostable multivibrator. Applications include:
- Flexible pulse generation with externally settable width (RC network).
- Pulse stretching and debouncing of mechanical switches.
- Timing/control circuits: fixed delays, gating, and blanking pulses for counters, latches, and clock/dividers.
- Event timing in microcontroller interfaces; synchronizing asynchronous events to a clock.
- Glitch suppression and one-shot gating for digital systems; generating defined enable pulses.
- Retriggerable operation to extend pulse length on subsequent triggers, useful for debounce and pulse shaping.
- Flexible pulse generation with externally settable width (RC network).
- Pulse stretching and debouncing of mechanical switches.
- Timing/control circuits: fixed delays, gating, and blanking pulses for counters, latches, and clock/dividers.
- Event timing in microcontroller interfaces; synchronizing asynchronous events to a clock.
- Glitch suppression and one-shot gating for digital systems; generating defined enable pulses.
- Retriggerable operation to extend pulse length on subsequent triggers, useful for debounce and pulse shaping.
Package
It’s a 14‑pin Small Outline IC (SOIC) package. The AMX suffix specifies the particular SOIC variant for the 74VHC123.
