74HCT244D

74HC244; 74HCT244 Octal buffer/line driver; 3-state Product datasheet, Rev. 1.0 Aug 08, 2024 1.General Description The 74HC244; 74HCT244 are 8-bit buffer/line drivers with 3-state outputs. The device can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC. 2.Features and Benefits  Wide supply voltage range from 2.0 V to 6.0 V  High noise immunity  CMOS low power dissipation  Latch-up performance exceeds 250 mA  Octal bus interface  Non-inverting 3-state outputs  Complies with JEDEC standards: • JESD8C (2.7 V to 3.6 V) • JESD7A (2.0 V to 6.0 V)  Input levels: • For 74HC244: CMOS level • For 74HCT244: TTL level  ESD protection:  • HBM ANSI/ESDA/JEDEC JS-001 Class 3A exceeds 6000 V • CDM ANSI/ESDA/JEDEC JS-002 Class C3 exceeds 2000 V Multiple package options Rev. 1.0 – Aug 08, 2024 1 74HC244; 74HCT244 Octal buffer/line driver; 3-state 3.Ordering Information Table 1. Ordering information Type number 74HC244D 74HCT244D 74HC244PW 74HCT244PW Rev. 1.0 – Aug 08, 2024 Package Name Description Quantity SOP-20L plastic small outline package; 20 leads; body width 7.5 mm 2000 TSSOP-20L plastic thin shrink small outline package; 20 leads; body width 4.4 mm 2000 2 74HC244; 74HCT244 Octal buffer/line driver; 3-state 4.Function Diagram Fig. 1. Functional diagram Fig. 2. Logic symbol Rev. 1.0 – Aug 08, 2024 Fig. 3. IEC logic symbol 3 74HC244; 74HCT244 Octal buffer/line driver; 3-state 5.Pinning Information 5.1. Pinning Fig. 4. Top view pin configuration SOP and TSSOP 5.2. Pin description Table 2. Pin description Symbol Pin Description 1OE, 2OE 1, 19 Output enable input(active LOW) 1A0, 1A1, 1A2, 1A3 2, 4, 6, 8 Data input 2Y0, 2Y1, 2Y2, 2Y3 3, 5, 7, 9 Bus output GND 10 Ground (0V) 2A0, 2A1, 2A2, 2A3 17, 15, 13, 11 Data input 1Y0, 1Y1, 1Y2, 1Y3 18, 16, 14, 12 Bus output VCC 20 Supply voltage Rev. 1.0 – Aug 08, 2024 4 74HC244; 74HCT244 Octal buffer/line driver; 3-state 6.Functional Description Table 3. Function table H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state. Input Output nOE nAn nYn L L L L H H H X Z 7.Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Table 4. Absolute Maximum Ratings In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND. Symbol Parameter Conditions VCC supply voltage IIK input clamping current VI < -0.5 V or VI > VCC + 0.5 V IOK output clamping current VO < -0.5 V or VO > VCC + 0.5 V IO output current VO = -0.5 V to (VCC + 0.5 V) ICC supply current IGND ground current Ptot total power dissipation Tstg storage temperature Min Max Unit -0.5 7.0 V [1] ±20 mA [1] ±20 mA ±25 mA 50 mA -50 -65 mA 500 mW 150 °C [1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed. Rev. 1.0 – Aug 08, 2024 5 74HC244; 74HCT244 Octal buffer/line driver; 3-state 8.Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. MDD does not recommend exceeding them or designing to Absolute Maximum Ratings. Table 5. Recommended Operating Conditions Symbol Parameter VCC Conditions 74HC244 74HCT244 Unit Min Typ Max Min Typ Max supply voltage 2.0 5.0 6.0 2.7 5.0 5.5 V VI input voltage 0 VCC 0 VCC V VO output voltage 0 VCC 0 VCC V Tamb ambient temperature -40 125 -40 125 °C Δt/ΔV input transition rise and fall rate Rev. 1.0 – Aug 08, 2024 VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V 625 1.67 139 83 ns/V 1.67 139 ns/V ns/V 6 74HC244; 74HCT244 Octal buffer/line driver; 3-state 9.Static Characteristics Table 6. Static characteristics At recommended operating conditions. Voltages are referenced to GND (ground = 0 V). Typical values measured at Tamb = 25°C (unless otherwise noted). Symbol Parameter Conditions -40 °C to +85 °C Min Typ Max -40 °C to +125 °C Min Max Unit 74HC244 VIH VIL HIGH-level input voltage LOW-level input voltage VCC = 2.0 V 1.5 1.5 V VCC = 4.5 V 3.15 3.15 V VCC = 6.0 V 4.2 4.2 V VCC = 2.0 V 0.5 0.5 V VCC = 4.5 V 1.35 1.35 V VCC = 6.0 V 1.8 1.8 V VI = VIH or VIL VOH HIGH-level output voltage IO = -20 μA; VCC = 2.0 V 1.9 1.9 V IO = -20 μA; VCC = 4.5 V 4.4 4.4 V IO = -20 μA; VCC = 6.0 V 5.9 5.9 V IO = -6.0 mA; VCC = 4.5 V 3.84 3.7 V IO = -7.8 mA; VCC = 6.0 V 5.34 5.2 V VI = VIH or VIL VOL II IOZ ICC CI LOW-level output voltage input leakage current OFF-state output current supply current input capacitance Rev. 1.0 – Aug 08, 2024 IO = 20 μA; VCC = 2.0 V 0.1 0.1 V IO = 20 μA; VCC = 4.5 V 0.1 0.1 V IO = 20 μA; VCC = 6.0 V 0.1 0.1 V IO = 6.0 mA; VCC = 4.5 V 0.33 0.4 V IO = 7.8 mA; VCC = 6.0 V 0.33 0.4 V VI = VCC or GND ; VCC = 6.0 V ±1 ±1 μA VI = VIH or VIL ; VCC = 6.0 V ; VO = VCC or GND ±5 ±10 μA VI = VCC or GND ; IO = 0 A ; VCC = 6.0 V 20 40 μA Pin OE 4.0 pF Pin nAn 7.7 pF 7 74HC244; 74HCT244 Octal buffer/line driver; 3-state Symbol Parameter Conditions -40 °C to +85 °C Min Typ Max -40 °C to +125 °C Min Max Unit 74HCT244 VIH VIL HIGH-level input voltage LOW-level input voltage VCC = 3 V 2.0 2.0 V VCC = 4.5 V 2.0 2.0 V VCC = 5.5 V 2.1 2.1 V VCC = 3 V 0.7 0.7 V VCC = 4.5 V 0.8 0.8 V VCC = 5.5 V 0.8 0.8 V VI = VIH or VIL; VOH HIGH-level output voltage IO = -20 μA; VCC = 3 V 2.9 2.9 V IO = -20 μA; VCC = 4.5 V 4.4 4.4 V IO = -6.0 mA; VCC = 4.5 V 3.84 3.7 V VI = VIH or VIL; VOL II IOZ ICC ΔICC CI LOW-level output voltage input leakage current OFF-state output current supply current additional supply current input capacitance Rev. 1.0 – Aug 08, 2024 IO = 20 μA; VCC = 3 V 0.1 0.1 V IO = 20 μA; VCC = 4.5 V 0.1 0.1 V IO = 6.0 mA; VCC = 4.5 V 0.33 0.4 V VI = VCC or GND ; VCC = 5.5 V ±1 ±1 μA VI = VIH or VIL ; VCC = 5.5 V ; VO = VCC or GND ±5 ±10 μA 20 40 μA 400 490 μA VI = VCC or GND; IO = 0 A; VCC = 5.5 V per pin ; VI = VCC - 2.1 V; IO = 0 A; other inputs at VCC or GND; VCC = 4.5 V to 5.5 V Pin OE 4.0 pF Pin nAn 7.7 pF 8 74HC244; 74HCT244 Octal buffer/line driver; 3-state 10. Dynamic Characteristics Table 7. Dynamic characteristics Voltages are referenced to GND (ground = 0 V); for test circuit see Fig. 7. Typical values measured at Tamb = 25°C (unless otherwise noted). Symbol Parameter -40 °C to +85 °C Conditions Min Typ -40 °C to +125 °C Max Min Max Unit 74HC244 nAn to nYn; see Fig. 5 tpd propagation delay VCC = 2.0 V 35 40 ns VCC = 4.5 V 20 25 ns VCC = 6.0 V 15 20 ns VCC = 2.0 V 35 40 ns VCC = 4.5 V 20 25 ns VCC = 6.0 V 15 20 ns VCC = 2.0 V 35 40 ns VCC = 4.5 V 20 25 ns VCC = 6.0 V 15 20 ns VCC = 2.0 V 9 11 ns VCC = 4.5 V 6 8 ns VCC = 6.0 V 4 5 ns nOE to nYn; see Fig. 6 ten enable time nOE to nYn; see Fig. 6 tdis disable time see Fig. 5 tt CPD transition time power dissipation capacitance Rev. 1.0 – Aug 08, 2024 [1] Per buffer ; VI = GND [5] [2] [3] [4] to VCC 18 pF 9 74HC244; 74HCT244 Octal buffer/line driver; 3-state Symbol Parameter Conditions tpd propagation delay ten enable time tdis disable time nA to nY; VCC = 4.5 V; see Fig. 5 nOE to nYn; VCC = 4.5 V; see Fig. 6 nOE to nYn; VCC = 4.5 V; see Fig. 6 -40 °C to +85 °C Min Typ -40 °C to +125 °C Max Min Max Unit 74HCT244 tt CPD transition time power dissipation capacitance [1] [2] [3] VCC = 4.5 V; see Fig. 5 [4] per buffer ; VI = GND to (VCC -1.5 V) [5] 18 20 25 ns 20 25 ns 20 25 ns 6 8 ns pF [1] tpd is the same as tPHL and tPLH. [2] ten is the same as tPZH and tPZL. [3] tdis is the same as tPLZ and tPHZ. [4] tt is the same as tTHL and tTLH. [5] CPD is used to determine the dynamic power dissipation (PD in μW). PD = CPD × VCC2 × fi × N + Σ(CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in V; N = number of inputs switching; Σ(CL × VCC2 × fo) = sum of outputs. Rev. 1.0 – Aug 08, 2024 10 74HC244; 74HCT244 Octal buffer/line driver; 3-state 10.1. Waveforms and test circuit Measurement points are given in Table 8. VOL and VOH are typical output voltage levels that occur with the output load. Fig. 5. The input nAn to output nYn propagation delays Measurement points are given in Table 8. VOL and VOH are typical output voltage levels that occur with the output load. Fig. 6. 3-state enable and disable times Table 8. Measurement points Input Output VM VM VX VY 74HC244 0.5VCC 0.5VCC 0.1VCC 0.9VCC 74HCT244 1.3 V 1.3 V 0.1VCC 0.9VCC Type Rev. 1.0 – Aug 08, 2024 11 74HC244; 74HCT244 Octal buffer/line driver; 3-state Test data is given in Table 9. Definitions for test circuit: RL = Load resistance. CL = Load capacitance including jig and probe capacitance. RT = Termination resistance should be equal to the output impedance Zo of the pulse generator. VEXT = External voltage for measuring switching times. Fig. 7. Test circuit for measuring switching times Table 9. Test data Type Input Load VEXT VI tr = tf CL RL tPLH, tPHL tPZH, tPHZ tPZL, tPLZ 74HC244 VCC ≤ 2.5 ns 50 pF 500Ω open GND 2VCC 74HCT244 3V ≤ 2.5 ns 50 pF 500Ω open GND 2VCC Rev. 1.0 – Aug 08, 2024 12 74HC244; 74HCT244 Octal buffer/line driver; 3-state 11. Package Outline SOP-20L Symbol A A1 A2 A3 B B1 C C1 C2 C3 Dimensions In Millimeters Min. Max. 12.600 12.900 0.381 0.431 1.240 1.300 0.450 0.460 7.400 7.600 10.206 10.406 2.150 2.300 0.938 1.038 0.938 1.2038 0.145 0.205 Rev. 1.0 – Aug 08, 2024 Symbol C4 D D1 D2 R1 R2 θ1 θ2 θ3 Dimensions In Millimeters Min. Max. 0.246 0.262 1.353 1.453 0.764 0.964 0.18TYP 0.30TYP 0.20TYP 12° TYP 12° TYP 0° ~ 8° 13 74HC244; 74HCT244 Octal buffer/line driver; 3-state TSSOP-20L Symbol A A1 A2 A3 b b1 c c1 D E1 Dimensions In Millimeters Min. Max. 1.20 0.05 0.15 0.80 1.05 0.39 0.49 0.20 0.28 0.19 0.25 0.13 0.17 0.12 0.14 6.40 6.60 4.30 4.50 Rev. 1.0 – Aug 08, 2024 Symbol E e L L1 θ Dimensions In Millimeters Min. Max. 6.20 6.60 0.65BSC 0.45 0.75 1.00REF 0° 8° 14 74HC244; 74HCT244 Octal buffer/line driver; 3-state 12. Abbreviations Table 10. Abbreviations Acronym Description CMOS Complementary Metal-Oxide Semiconductor DUT Device Under Test ESD ElectroStatic Discharge HBM Human Body Model CDM Charged Device Model TTL Transistor-Transistor Logic 13. Revision History Table 11. Revision history Document ID Release Date Data sheet status 74HC_HCT244 Rev. 1.0 Nov 01, 2024 Product datasheet Rev. 1.0 – Aug 08, 2024 Change notice Supersedes 15