DATA SHEET
SNx414 and SNx4LS14 Hex Schmitt-Trigger Inverters
1 Features
- Operation From Very Slow Edges
- Improved Line-Receiving Characteristics
- High Noise Immunity
2 Applications
- HVAC Gateways
- Residential Ductless Air Conditioning Outdoor Units
- Robotic Controls
- Industrial Stepper Motors
- Power Meter and Power Analyzers
- Digital Input Modules for Factory Automation
3 Description
Each circuit in SNx414 and SNx4LS14 functions as an inverter. However, because of the Schmitt-Trigger action, they have different input threshold levels for positive-going (VT+) and negative-going (VT–) signals.
These circuits are temperature compensated and can be triggered from the slowest of input ramps and still give clean, jitter-free output signals.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| SN7414, SN74LS14 |
SOIC (14) | 4.90 mm × 3.91 mm |
| SSOP (14) | 6.20 mm × 5.30 mm | |
| PDIP (14) | 19.30 mm × 6.35 mm | |
| SO (14) | 10.30 mm × 5.30 mm | |
| SN5414, SN54LS14 |
CDIP (14) | 19.56 mm × 6.67 mm |
| CFP (14) | 9.21 mm × 5.97 mm | |
| LCCC (20) | 8.89 mm × 8.89 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Logic Diagram (Positive Logic)
4 Revision History
Changes from B Revision (February 2002) to C Revision
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go
- Deleted Ordering Information table; see the Package Option Addendum at the end of the data sheet Go
- Changed Package thermal impedance, RθJA, values in Thermal Information table From: 86°C/W To: 90.1°C/W (D), From: 96°C/W To: 105.4°C/W (DB), From: 80°C/W To: 54.9°C/W (N), and From: 76°C/W To: 88.8°C/W (NS)Go
5 Pin Configuration and Functions
D, DB, N, NS, J, or W Package
14-Pin SOIC, SSOP, PDIP, SO, CDIP, or CFP
Top View
FK Package
20-Pin LCCC
Top View
NC – No internal connection
Pin Functions
| PIN | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | SOIC, SSOP, TVSOP, CDIP, PDIP,TSSOP, CFP | LCCC | ||
| 1A | 1 | 2 | I | Channel 1 input |
| 1Y | 2 | 3 | O | Channel 1 output |
| 2A | 3 | 4 | I | Channel 2 input |
| 2Y | 4 | 6 | O | Channel 2 output |
| 3A | 5 | 8 | I | Channel 3 input |
| 3Y | 6 | 9 | O | Channel 3 output |
| 4A | 9 | 13 | I | Channel 4 input |
| 4Y | 8 | 12 | O | Channel 4 output |
| 5A | 11 | 16 | I | Channel 5 input |
| 5Y | 10 | 14 | O | Channel 5 output |
| 6A | 13 | 19 | I | Channel 6 input |
| 6Y | 12 | 18 | O | Channel 6 output |
| GND | 7 | 10 | — | Ground |
| NC | — | 1, 5, 7, 11, 15, 17 |
— | No internal connection |
| VCC | 14 | 20 | — | Power supply |
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Supply voltage, VCC(2) | 7 | V | ||
| Input voltage | SNx414 | 5.5 | V | |
| SNx4LS14 | 7 | |||
| Junction temperature, TJ | 150 | °C | ||
| Storage temperature, Tstg | –65 | 150 | °C | |
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Voltage values are with respect to network ground terminal.
6.2 ESD Ratings
| VALUE | UNIT | |||
|---|---|---|---|---|
| V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±1500 | V |
| Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±2000 | |||
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)| MIN | NOM | MAX | UNIT | |||
|---|---|---|---|---|---|---|
| VCC | Supply voltage | SN5414, SN54LS14 | 4.5 | 5 | 5.5 | V |
| SN7414, SN74LS14 | 4.75 | 5 | 5.25 | |||
| IOH | High-level output current | SN5414, SN7414 | –0.8 | mA | ||
| SN54LS14, SN74LS14 | –0.4 | |||||
| IOL | Low-level output current | SN5414, SN7414 | 16 | mA | ||
| SN54LS14 | 4 | |||||
| SN74LS14 | 8 | |||||
| TA | Operating free-air temperature | SN5414, SN54LS14 | –55 | 125 | °C | |
| SN7414, SN74LS14 | 0 | 70 | ||||
6.4 Thermal Information
| THERMAL METRIC(1) | SNx414, SNx4LS14 | UNIT | ||||
|---|---|---|---|---|---|---|
| D (SOIC) | DB (SSOP) | N (PDIP) | NS (SO) | |||
| 14 PINS | 14 PINS | 14 PINS | 14 PINS | |||
| RθJA | Junction-to-ambient thermal resistance(2) | 90.1 | 105.4 | 54.9 | 88.8 | °C/W |
| RθJC(top) | Junction-to-case (top) thermal resistance | 50.3 | 57.3 | 42.5 | 46.5 | °C/W |
| RθJB | Junction-to-board thermal resistance | 44.3 | 52.7 | 34.7 | 47.5 | °C/W |
| ψJT | Junction-to-top characterization parameter | 17.9 | 22.5 | 27.8 | 16.8 | °C/W |
| ψJB | Junction-to-board characterization parameter | 44.1 | 52.2 | 34.6 | 47.2 | °C/W |
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.
(2) The package termal impedance is calculated in accordance with JESD 51-7.
6.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)| PARAMETER | TEST CONDITIONS(1) | MIN | TYP(2) | MAX | UNIT | ||
|---|---|---|---|---|---|---|---|
| VT+ | VCC = 5 V | SNx414 | 1.5 | 1.7 | 2 | V | |
| SNx4LS14 | 1.4 | 1.6 | 1.9 | ||||
| VT– | VCC = 5 V | SNx414 | 0.6 | 0.9 | 1.1 | V | |
| SNx4LS14 | 0.5 | 0.8 | 1 | ||||
| Hysteresis (VT+ – VT–) |
VCC = 5 V | 0.4 | 0.8 | V | |||
| VIK | VCC = MIN, II = –12 mA, SNx414 | –1.5 | V | ||||
| VCC = MIN, II = –18 mA, SNx4LS14 | –1.5 | ||||||
| VOH | VCC = MIN, VI = 0.6 V, IOH = –0.8 mA, SNx414 | 2.4 | 3.4 | V | |||
| VCC = MIN, VI = 0.5 V, IOH = –0.4 mA, SNx4LS14 | 2.4 | 3.4 | |||||
| VOL | VCC = MIN, VI = 2 V, IOL = 16 mA, SNx414 | 0.2 | 0.4 | V | |||
| VCC = MIN, VI = 1.9 V | IOL = 4 mA, SNx4LS14 | 0.25 | 0.4 | ||||
| IOL = 8 mA, SN74LS14 | 0.35 | 0.5 | |||||
| IT+ | VCC = 5 V, VI = VT+ | SNx414 | –0.43 | mA | |||
| SNx4LS14 | –0.14 | ||||||
| IT– | VCC = 5 V, VI = VT– | SNx414 | –0.56 | mA | |||
| SNx4LS14 | –0.18 | ||||||
| II | VCC = MAX, VI = 5.5 V, SNx414 | 1 | mA | ||||
| VCC = MAX, VI = 7 V, SNx4LS14 | 0.1 | ||||||
| IIH | VCC = MAX, VIH = 2.4 V, SNx414 | 40 | µA | ||||
| VCC = MAX, VIH = 2.7 V, SNx4LS14 | 20 | ||||||
| IIL | VCC = MAX, VIL = 0.4 V | SNx414 | –0.8 | –1.2 | mA | ||
| SNx4LS14 | –0.4 | ||||||
| IOS(3) | VCC = MAX | SNx414 | –18 | –55 | mA | ||
| SNx4LS14 | –20 | –100 | |||||
| ICCH | VCC = MAX | SNx414 | 22 | 36 | mA | ||
| SNx4LS14 | 8.6 | 16 | |||||
| ICCL | VCC = MAX | SNx414 | 39 | 60 | mA | ||
| SNx4LS14 | 12 | 21 | |||||
(1) For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
(2) All typical values are at VCC = 5 V and TA = 25°C.
(3) Not more than one output should be shorted at a time.
6.6 Switching Characteristics
VCC = 5 V, TA = 25°C, and over operating free-air temperature range (unless otherwise noted; see Figure 20)| PARAMETER | FROM (INPUT) | TO (OUTPUT) | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|---|---|
| tPLH | A | Y | RL = 400 Ω and CL = 15 pF, or RL = 2 kΩ and CL = 15 pF | 15 | 22 | ns | ||
| tPHL | A | Y | RL = 400 Ω and CL = 15 pF, or RL = 2 kΩ and CL = 15 pF | 15 | 22 | ns | ||
6.7 Typical Characteristics
6.7.1 SNx414 Circuits
Data for temperatures below 0°C and above 70°C and supply voltage below 4.75 V and above 5.25 V are applicable for SN5414 only.
Figure 1. Positive-Going Threshold Voltagevs Free-Air Temperature
Figure 3. Hysteresis vs Free-Air Temperature
Figure 5. Threshold Voltages vs Supply Voltage
Figure 7. Output Voltage vs Input Voltage
Figure 2. Negative-Going Threshold Voltagevs Free-Air Temperature
Figure 4. Distribution of Units for Hysteresis
Figure 6. Hysteresis vs Supply Voltage
6.7.2 SNx4LS14 Circuits
Data for temperatures below 0°C and above 70°C and supply voltage below 4.75 V and above 5.25 V are applicable for SNx4LS14 only.
Figure 8. Positive-Going Threshold Voltagevs Free-Air Temperature
Figure 10. Hysteresis vs Free-Air Temperature
Figure 12. Threshold Voltages and Hysteresisvs Supply Voltage
Figure 9. Negative-Going Threshold Voltagevs Free-Air Temperature
Figure 11. Distribution of Units for Hysteresis
Figure 13. Output Voltage vs Input Voltage
7 Parameter Measurement Information
7.1 Series SN5414 and SN7414 Devices
Figure 14. Load Circuit For2-State Totem-Pole Outputs
Figure 16. Load Circuit For 3-State Outputs
Figure 18. Voltage WaveformsSetup and Hold Times
Figure 15. Load Circuit ForOpen-Collector Outputs
Figure 17. Voltage Waveforms Pulse Durations
Figure 19. Voltage WaveformsPropagation Delay Times
A. CL includes probe and jig capacitance.
B. All diodes are 1N3064 or equivalent.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
D. S1 and S2 are closed for tPLH, tPHL, tPHZ, and tPLZ; S1 is open and S2 is closed for tPZH; S1 is closed and S2 is open for tPZL.
E. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO ≈ 50 Ω ; tr and tf ≤ 7 ns for Series SN5414 and SN7414 devices and tr and tf ≤ 2.5 ns for Series SN54S14 and SN74S14 devices.
F. The outputs are measured one at a time with one input transition per measurement.
Figure 20. Voltage Waveforms Enable and Disable Times, 3-State Outputs
7.2 Series SN54LS14 and SN74LS14 Devices
Figure 21. Load Circuit For2-State Totem-Pole Outputs
Figure 23. Load Circuit For 3-State Outputs
Figure 25. Voltage WaveformsSetup and Hold Times
Figure 22. Load Circuit ForOpen-Collector Outputs
Figure 24. Voltage Waveforms Pulse Durations
Figure 26. Voltage WaveformsPropagation Delay Times
A. CL includes probe and jig capacitance.
B. All diodes are 1N3064 or equivalent.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
D. S1 and S2 are closed for tPLH, tPHL, tPHZ, and tPLZ; S1 is open and S2 is closed for tPZH; S1 is closed and S2 is open for tPZL.
E. Phase relationships between inputs and outputs have been chosen arbitrarily for these examples.
F. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO ≈ 50 Ω, tr ≤ 1.5 ns, tf ≤ 2.6 ns.
G. The outputs are measured one at a time with one input transition per measurement.
Figure 27. Voltage Waveforms Enable and Disable Times, 3-State Outputs
8 Detailed Description
8.1 Overview
The SNx414 and SNx4LS14 Schmitt-Trigger devices contain six independent inverters. They perform the Boolean function Y = A in positive logic.
Schmitt-Trigger inputs are designed to provide a minimum separation between positive and negative switching thresholds. This allows for noisy or slow inputs that would cause problems such as oscillation or excessive current draw with normal CMOS inputs.
8.2 Functional Block Diagram
8.3 Feature Description
The device can operate from very slow transition edge inputs. This device has high noise immunity.
8.4 Device Functional Modes
Table 1 lists the functional modes of the SNx414 and SNx4LS14.
Table 1. Function Table
| INPUT A | OUTPUT Y |
|---|---|
| H | L |
| L | H |
