SN74HC244PWT

SN54HC244, SN74HC244 SCLS130F – DECEMBER 1982 – REVISED MAY 2022 SNx4HC244 Octal Buffers and Line Drivers With 3-State Outputs 1 Features 3 Description • • • The SNx4HC244 octal buffers and line drivers are designed specifically to improve both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The SNx4HC244 devices are organized as two 4bit buffers and drivers with separate output-enable (OE) inputs. When OE is low, the device passes noninverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the highimpedance state. • • • • • Wide Operating Voltage Range of 2 V to 6 V High-Current Outputs Drive Up to 15 LSTTL Loads 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers Low Power Consumption: ICC, 80-µA (Maximum) Typical tpd = 11 ns ±6-mA Output Drive at 5 V Low Input Current of 1 µA (Maximum) On Products Compliant to MIL-PRF-38535, All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters. 2 Applications • • • • • • Device Information PART NUMBER SN54HC244 Servers LED Displays Network Switches Telecom Infrastructure Motor Drivers I/O Expanders 1A3 1A4 CDIP (20) 6.92 mm × 24.38 mm CFP (20) 6.92 mm × 13.72 mm LCCC (20) 8.89 mm × 8.89 mm SSOP (20) 5.30 mm × 7.25 mm SN74HC244DW SOIC (20) 7.50 mm × 12.80 mm SN74HC244N PDIP (20) 6.30 mm × 25.40 mm SN74HC244NS SOP (20) 5.30 mm × 12.60 mm SN74HC244PW TSSOP (20) 4.40 mm × 6.50 mm For all available packages, see the orderable addendum at the end of the data sheet. 2OE 19 1OE 1 1A2 BODY SIZE (NOM) SN74HC244DB (1) 2 18 1Y1 2A1 4 16 1Y1 2A2 6 14 1Y1 2A3 8 12 1Y4 2A4 1A1 PACKAGE (PINS)(1) 11 9 1Y1 13 7 1Y1 15 5 1Y1 17 3 1Y4 Copyright © 2016, Texas Instruments Incorporated Logic Diagram (Positive Logic) An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 Table of Contents 1 Features............................................................................1 2 Applications..................................................................... 1 3 Description.......................................................................1 4 Revision History.............................................................. 2 5 Pin Configuration and Functions...................................3 Pin Functions.................................................................... 3 6 Specifications.................................................................. 4 6.1 Absolute Maximum Ratings........................................ 4 6.2 ESD Ratings............................................................... 4 6.3 Recommended Operating Conditions.........................4 6.4 Thermal Information....................................................5 6.5 Electrical Characteristics.............................................5 6.6 Electrical Characteristics – SN54HC244.................... 5 6.7 Electrical Characteristics – SN74HC244.................... 6 6.8 Switching Characteristics............................................6 6.9 Switching Characteristics – CL = 50 pF...................... 8 6.10 Switching Characteristics – CL = 150 pF.................. 8 6.11 Typical Characteristic................................................ 9 7 Parameter Measurement Information.......................... 10 8 Detailed Description......................................................12 8.1 Overview................................................................... 12 8.2 Functional Block Diagram......................................... 12 8.3 Feature Description...................................................12 8.4 Device Functional Modes..........................................12 9 Application and Implementation.................................. 13 9.1 Application Information............................................. 13 9.2 Typical Application.................................................... 13 10 Power Supply Recommendations..............................14 11 Layout........................................................................... 14 11.1 Layout Guidelines................................................... 14 11.2 Layout Example...................................................... 14 12 Device and Documentation Support..........................15 12.1 Documentation Support.......................................... 15 12.2 Receiving Notification of Documentation Updates..15 12.3 Support Resources................................................. 15 12.4 Trademarks............................................................. 15 12.5 Electrostatic Discharge Caution..............................15 12.6 Glossary..................................................................15 13 Mechanical, Packaging, and Orderable Information.................................................................... 15 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (May 2016) to Revision F (May 2022) Page • Junction-to-ambient thermal resistance values increased to match current function......................................... 5 Changes from Revision D (August 2003) to Revision E (May 2016) Page • 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................... 1 • Added Military Disclaimer to Features section....................................................................................................1 • Added Applications section.................................................................................................................................1 • Removed Ordering Information table..................................................................................................................1 • Added Device Information table..........................................................................................................................1 2 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 1Y2 1A3 6 15 2A3 2Y2 7 14 1Y3 1A4 8 13 2A2 2Y1 9 12 1Y4 GND 10 11 2A1 Figure 5-1. DB, DW, J, N, NS, PW, W Package 20Pin SSOP, SOIC, CDIP, PDIP, SOP, TSSOP, or CFP Top View 2OE 16 19 5 4 18 1Y1 2Y3 5 17 2A4 1A3 6 16 1Y2 2Y2 7 15 2A3 1A4 8 14 1Y3 13 2Y3 1A2 2A2 2A4 VCC 17 20 4 12 1A2 1Y4 1Y1 1OE 18 1 3 11 2Y4 2A1 2OE 1A1 19 2 2 10 1A1 GND VCC 2Y4 20 9 1 2Y1 1OE 3 5 Pin Configuration and Functions Figure 5-2. FK Package 20-Pin LCCC Top View Pin Functions PIN NO. NAME I/O(1) DESCRIPTION 1 1 OE I Output Enable 2 1A1 I Input 3 2Y4 O Output 4 1A2 I Input 5 2Y3 O Output 6 1A3 I Input 7 2Y2 O Output 8 1A4 I Input 9 2Y1 O Output 10 GND — Ground 11 2A1 I Input 12 1Y4 O Output 13 2A2 I Input 14 1Y3 O Output 15 2A3 I Input 16 1Y2 O Output 17 2A4 I Input 18 1Y1 O Output 19 2 OE I Output Enable 20 VCC — (1) Power Pin Signal Types: I = Input, O = Output, I/O = Input or Output. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 3 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)(1) Supply voltage range, VCC MIN MAX UNIT –0.5 7 V (2) Input clamp current, IIK VI < 0 or VI > VCC ±20 mA Output clamp current, IOK VO < 0 or VO > VCC (2) ±20 mA Continuous output current, IO VO = 0 or VCC ±35 mA ±70 mA 150 °C 150 °C Continuous current through VCC or GND Junction Temperature, TJ Storage temperature, Tstg (1) (2) –65 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. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 6.2 ESD Ratings SN74HC244 V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC VALUE JS-001(1) UNIT ±2000 Charged-device model (CDM), per JEDEC specification JESD22-C101(2) V ±1000 JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. 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)(1) VCC Supply voltage VIH High-level input voltage VCC = 2 V VCC = 4.5 V VCC = 6 V MIN NOM MAX 2 5 6 Low-level input voltage V 4.2 0.5 VCC = 4.5 V 1.35 VCC = 6 V V 1.8 VI Input voltage 0 VCC V VO Output voltage 0 VCC V VCC = 2 V Δt/Δv Cpd TA (1) 4 V 1.5 3.15 VCC = 2 V VIL UNIT Input transition rise and fall time 1000 VCC = 4.5 V 500 VCC = 6 V 400 Power dissipation capacitance per buffer or driver (no load) Operating free-air temperature 35 ns/V pF SN54HC244 –55 125 SN74HC244 –40 85 °C All unused inputs of the device must be held at VCC or GND to ensure proper device operation. See the Texas Instruments application report, Implications of Slow or Floating CMOS Inputs, SCBA004. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 6.4 Thermal Information SN74HC244 THERMAL METRIC DW (SOIC) DB (SSOP) N (PDIP) NS (SO) PW (TSSOP) 20 PINS 20 PINS 20 PINS 20 PINS 20 PINS UNIT 109.1 122.7 84.6 113.4 131.8 °C/W 76 81.6 72.5 78.6 72.2 °C/W RθJA Junction-to-ambient thermal (1) resistance RθJC (top) Junction-to-case (top) thermal resistance RθJB Junction-to-board thermal resistance 77.6 77.5 65.3 78.4 82.8 °C/W ΨJT Junction-to-top characterization parameter 51.5 46.1 55.3 47.1 21.5 °C/W ΨJB Junction-to-board characterization parameter 77.1 77.1 65.2 78.1 82.4 °C/W RθJC (bot) Junction-to-case (bottom) thermal resistance N/A N/A N/A N/A N/A °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = –20 µA VOH VI = VIH or VIL MIN TYP VCC = 2 V 1.9 1.998 VCC = 4.5 V 4.4 4.499 5.9 5.999 3.98 4.3 VCC = 6 V IOH = –6 mA, VCC = 4.5 V IOH = –7.8 mA, VCC = 6 V 5.8 0.002 0.1 VCC = 4.5 V 0.001 0.1 VCC = 6 V 0.001 0.1 IOL = 6 mA, VCC = 4.5 V 0.17 0.26 IOL = 7.8 mA, VCC = 6 V 0.15 0.26 VI = VIH or VIL II VI = VCC or 0, VCC = 6 V IOZ VO = VCC or 0, VI = VIH or VIL, VCC = 6 V ICC VI = VCC or 0, IO = 0, VCC = 6 V Ci VCC = 2 V to 6 V UNIT V VCC = 2 V IOL = 20 µA VOL 5.48 MAX V ±0.1 ±100 nA ±0.01 ±0.5 µA 8 µA 3 10 pF 6.6 Electrical Characteristics – SN54HC244 over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = –20 µA VOH VI = VIH or VIL MIN VCC = 2 V 1.9 VCC = 4.5 V 4.4 VCC = 6 V 5.9 IOH = –6 mA, VCC = 4.5 V 3.7 IOH = –7.8 mA, VCC = 6 V 5.2 TYP MAX UNIT V Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 5 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOL = 20 µA VOL VI = VIH or VIL MIN TYP 0.1 VCC = 4.5 V 0.1 VCC = 6 V 0.1 IOL = 6 mA, VCC = 4.5 V VI = VCC or 0, VCC = 6 V IOZ ICC Ci VCC = 2 V to 6 V UNIT V 0.4 IOL = 7.8 mA, VCC = 6 V II MAX VCC = 2 V 0.4 ±1000 nA VO = VCC or 0, VI = VIH or VIL, VCC = 6 V ±10 µA VI = VCC or 0, IO = 0, VCC = 6 V 160 µA 10 pF 6.7 Electrical Characteristics – SN74HC244 over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = –20 µA VOH VI = VIH or VIL 1.9 VCC = 4.5 V 4.4 VCC = 6 V 5.9 IOH = –6 mA, VCC = 4.5 V 3.84 IOH = –7.8 mA, VCC = 6 V 5.34 IOL = 20 µA VOL MIN VCC = 2 V VI = VIH or VIL TYP VCC = 2 V 0.1 VCC = 4.5 V 0.1 VCC = 6 V 0.1 IOZ ICC Ci V 0.33 IOL = 7.8 mA, VCC = 6 V VI = VCC or 0, VCC = 6 V UNIT V IOL = 6 mA, VCC = 4.5 V II MAX 0.33 ±1000 nA VO = VCC or 0, VI = VIH or VIL, VCC = 6 V ±5 µA VI = VCC or 0, IO = 0, VCC = 6 V 80 µA VCC = 2 V to 6 V 10 pF UNIT 6.8 Switching Characteristics TA = 25°C (unless otherwise noted; see Figure 7-1) PARAMETER TEST CONDITIONS VCC = 2 V tpd From A (input) to Y (output) VCC = 4.5 V VCC = 6 V VCC = 2 V ten From OE (input) to Y (output) VCC = 4.5 V VCC = 6 V 6 TYP MAX CL = 50 pF MIN 40 115 CL = 150 pF 56 165 CL = 50 pF 13 23 CL = 150 pF 18 33 CL = 50 pF 11 20 CL = 150 pF 15 28 CL = 50 pF 75 150 CL = 150 pF 100 200 CL = 50 pF 15 30 CL = 150 pF 20 40 CL = 50 pF 13 26 CL = 150 pF 17 34 Submit Document Feedback ns ns Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 TA = 25°C (unless otherwise noted; see Figure 7-1) PARAMETER tdis TEST CONDITIONS From OE (input) to Y (output) TYP MAX VCC = 2 V CL = 50 pF 75 150 VCC = 4.5 V CL = 50 pF 15 30 VCC = 6 V CL = 50 pF 13 26 CL = 50 pF 28 60 CL = 150 pF 45 210 CL = 50 pF 8 12 CL = 150 pF 17 42 CL = 50 pF 6 10 CL = 150 pF 13 36 VCC = 2 V tt To Y (output) VCC = 4.5 V VCC = 6 V MIN UNIT ns ns Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 7 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 6.9 Switching Characteristics – CL = 50 pF over recommended operating free-air temperature range (unless otherwise noted; see Figure 7-1) PARAMETER TEST CONDITIONS VCC = 2 V tpd From A (input) to Y (output) VCC = 4.5 V VCC = 6 V VCC = 2 V ten From OE (input) to Y (output) VCC = 4.5 V VCC = 6 V VCC = 2 V tdis From OE (input) to Y (output) VCC = 4.5 V VCC = 6 V VCC = 2 V tt VCC = 4.5 V To Y (output) VCC = 6 V MIN TYP MAX SN54HC244 170 SN74HC244 145 SN54HC244 34 SN74HC244 29 SN54HC244 29 SN74HC244 25 SN54HC244 225 SN74HC244 190 SN54HC244 45 SN74HC244 38 SN54HC244 38 SN74HC244 32 SN54HC244 225 SN74HC244 190 SN54HC244 45 SN74HC244 38 SN54HC244 38 SN74HC244 32 SN54HC244 90 SN74HC244 75 SN54HC244 18 SN74HC244 15 SN54HC244 15 SN74HC244 13 UNIT ns ns ns ns 6.10 Switching Characteristics – CL = 150 pF over recommended operating free-air temperature range (unless otherwise noted; see Figure 7-1) PARAMETER TEST CONDITIONS VCC = 2 V tpd From A (input) to Y (output) VCC = 4.5 V VCC = 6 V VCC = 2 V ten From OE (input) to Y (output) VCC = 4.5 V VCC = 6 V 8 MIN TYP MAX SN54HC244 245 SN74HC244 210 SN54HC244 49 SN74HC244 42 SN54HC244 42 SN74HC244 35 SN54HC244 300 SN74HC244 250 SN54HC244 60 SN74HC244 50 SN54HC244 51 SN74HC244 43 Submit Document Feedback UNIT ns ns Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 over recommended operating free-air temperature range (unless otherwise noted; see Figure 7-1) PARAMETER TEST CONDITIONS MIN VCC = 2 V tt To Y (output) VCC = 4.5 V VCC = 6 V TYP MAX SN54HC244 315 SN74HC244 265 SN54HC244 63 SN74HC244 53 SN54HC244 53 SN74HC244 45 UNIT ns 6.11 Typical Characteristic 60 50 tpd (ns) 40 30 20 10 CL 50pF CL 150pF 0 2 3 4 5 VCC (V) 6 C001 Figure 6-1. Propagation Delay Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 9 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 7 Parameter Measurement Information VCC Test Point From Output Under Test S1 RL CL (see Note A) S2 Figure 7-1. Load Circuit VCC Input 50% 50% 0V tPLH In-Phase Output tPHL 50% 10% 90% VOH 50% 10% V OL tf 90% tr tPHL tPLH 90% Out-of-Phase Output 50% 10% 90% 50% 10% VOH VOL tf tr Figure 7-2. Propagation Delay and Output Transition Times Input 50% 10% 90% 90% VCC 50% 10% 0 V tr tf Figure 7-3. Input Rise and Fall Times Output Control (Low-Level Enabling) VCC 50% 50% 0V tPZL Output Waveform 1 (See Note B) tPLZ 10% tPZH Output Waveform 2 (See Note B) ≈VCC ≈VCC 50% VOL tPHZ 50% 90% VOH ≈0 V Figure 7-4. Enable and Disable Times for 3-State Outputs 10 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 Note NOTE: A. CL includes probe and test-fixture capacitance. B. 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. C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns. D. The outputs are measured one at a time with one input transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. Table 7-1. Switching Information Table PARAMETER ten tdis RL CL tPZH 1 kΩ tPZL 1 kΩ tPHZ 1 kΩ tPLZ 1 kΩ — tpd or tt S1 S2 50 pF or 150 pF Open Closed 50 pF or 150 pF Closed Open 50 pF Open Closed 50 pF Closed Open 50 pF or 150 pF Open Open Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 11 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 8 Detailed Description 8.1 Overview The SNx4HC244 device is organized as two 4-bit buffers and line drivers with separate output-enable ( OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. 8.2 Functional Block Diagram 2OE 19 1OE 1 2 18 1Y1 2A1 4 16 1Y1 2A2 6 14 1Y1 2A3 8 12 1Y4 2A4 1A1 1A2 1A3 1A4 11 9 1Y1 13 7 1Y1 15 5 1Y1 17 3 1Y4 Copyright © 2016, Texas Instruments Incorporated 8.3 Feature Description The SNx4HC244 has a wide operating voltage of 2 V to 6 V. Inputs accept voltage levels up to VCC. This device has a low power consumption of ICC 80 µA (maximum). The SNx4HC244 device can drive ±6 mA at VCC of 5 V. 8.4 Device Functional Modes Table 8-1 lists the functions of the SNx4HC244. Table 8-1. Function Table (Each Buffer or Driver) INPUTS 12 OUTPUT OE A Y L H H L L L H X Z Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 9 Application and Implementation Note Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes, as well as validating and testing their design implementation to confirm system functionality. 9.1 Application Information SN74HC244 is a high-drive CMOS device that can be used for a multitude of bus interface type applications where output drive or PCB trace length is a concern. 9.2 Typical Application Regulated 3V SN74HC244 1OE x x x MCU or System Logic A1 x x x A4 VCC Y1 x x x Y4 x x x MCU System Logic LEDS GND Copyright © 2016, Texas Instruments Incorporated Figure 9-1. SN74HC244 Application Schematic 9.2.1 Design Requirements This device uses CMOS technology and has balanced output drive. Take care to avoid bus contention because it can drive currents that would exceed maximum limits. The high drive also creates fast edges into light loads so routing and load conditions should be considered to prevent ringing. 9.2.2 Detailed Design Procedure 1. Recommended input conditions: • For rise time and fall time specifications, see Δt/ΔV in Section 6.3. • For specified high and low levels, see VIH and VIL in Section 6.3. 2. Recommend output conditions: • Load currents should not exceed IO max per output and should not exceed the continuous current through VCC or GND total current for the part. These limits are located in Section 6.1. • Outputs should not be pulled above VCC. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 13 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 9.2.3 Application Curve 100 90 80 ten (ns) 70 60 50 40 30 20 10 CL 50pF CL 150pF 0 2 3 4 5 VCC (V) 6 C002 Figure 9-2. Enable Time 10 Power Supply Recommendations The power supply can be any voltage between the MIN and MAX supply voltage rating located in the Section 6.3. Each VCC terminal should have a good bypass capacitor to prevent power disturbance. For devices with a single supply, TI recomments a 0.1-μF capacitor. If there are multiple VCC terminals, then TI recommends 0.01-μF or 0.022-μF capacitors for each power terminal. It is ok to parallel multiple bypass capacitors to reject different frequencies of noise. Multiple bypass capacitors may be paralleled to reject different frequencies of noise. The bypass capacitor should be installed as close to the power terminal as possible for the best results. 11 Layout 11.1 Layout Guidelines When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of digital logic devices are unused. Some examples are when only two inputs of a triple-input and gate are used, or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. Specified in Figure 11-1 are rules that must be observed under all circumstances. All unused inputs of digital logic devices must be connected to a high or low bias to prevent them from floating. The logic level that should be applied to any particular unused input depends on the function of the device. Generally they will be tied to GND or VCC, whichever makes more sense or is more convenient. 11.2 Layout Example VCC Unused Input Input Output Unused Input Output Input Figure 11-1. Layout Diagram 14 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 SN54HC244, SN74HC244 www.ti.com SCLS130F – DECEMBER 1982 – REVISED MAY 2022 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Links Table 12-1 lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 12-1. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY SN54HC244 Click here Click here Click here Click here Click here SN74HC244 Click here Click here Click here Click here Click here 12.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on Subscribe to updates to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 12.3 Support Resources TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. 12.4 Trademarks TI E2E™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 12.5 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 12.6 Glossary TI Glossary This glossary lists and explains terms, acronyms, and definitions. 13 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN54HC244 SN74HC244 15 PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) 5962-8409601VRA ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8409601VR A SNV54HC244J 5962-8409601VSA ACTIVE CFP W 20 25 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8409601VS A SNV54HC244W 84096012A ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 84096012A SNJ54HC 244FK 8409601RA ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8409601RA SNJ54HC244J Samples 8409601SA ACTIVE CFP W 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8409601SA SNJ54HC244W Samples JM38510/65705B2A ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705B2A Samples JM38510/65705BRA ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705BRA Samples JM38510/65705BSA ACTIVE CFP W 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705BSA Samples M38510/65705B2A ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705B2A Samples M38510/65705BRA ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705BRA Samples M38510/65705BSA ACTIVE CFP W 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 JM38510/ 65705BSA Samples SN54HC244J ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 SN54HC244J Samples SN74HC244APWR ACTIVE TSSOP PW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244A Samples SN74HC244DBR ACTIVE SSOP DB 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244DW ACTIVE SOIC DW 20 25 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244DWE4 ACTIVE SOIC DW 20 25 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples Addendum-Page 1 Samples Samples Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 10-Jun-2022 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) SN74HC244DWR ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244DWRE4 ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244DWRG4 ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244N ACTIVE PDIP N 20 20 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 SN74HC244N Samples SN74HC244NE4 ACTIVE PDIP N 20 20 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 SN74HC244N Samples SN74HC244NSR ACTIVE SO NS 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244NSRG4 ACTIVE SO NS 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PW ACTIVE TSSOP PW 20 70 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWE4 ACTIVE TSSOP PW 20 70 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWG4 ACTIVE TSSOP PW 20 70 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWR ACTIVE TSSOP PW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWRE4 ACTIVE TSSOP PW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWRG4 ACTIVE TSSOP PW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244PWT ACTIVE TSSOP PW 20 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HC244 Samples SN74HC244QDWRG4Q1 ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM HC244Q Samples SNJ54HC244FK ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 84096012A SNJ54HC 244FK SNJ54HC244J ACTIVE CDIP J 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8409601RA SNJ54HC244J Samples SNJ54HC244W ACTIVE CFP W 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8409601SA SNJ54HC244W Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2022 NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of