CD74HC244

Features:

• HC/HCT240 Inverting
• HC/HCT241 Non-Inverting
• HC/HCT244 Non-Inverting
• Typical Propagation Delay = 8ns at V_CC = 5V, C_L = 15pF, T_A = 25oC for HC240
• Three-State Outputs
• Buffered Inputs
• High-Current Bus Driver Outputs
• Fanout (Over Temperature Range)
  - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
  - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55 to 125
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
  - 2V to 6V Operation
  - High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
• HCT Types
  - 4.5V to 5.5V Operation
  - Direct LSTTL Input Logic Compatibility, V_IL= 0.8V (Max), V_IH = 2V (Min)
  - CMOS Input Compatibility, I_l 1A at V_OL, V_OH


Pinout




Specifications

DC Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
DC Input Diode Current, I_IK
    For VI < -0.5V or VI > V_CC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, I_OK
    For V_O < -0.5V or V_O > V_CC + 0.5V . . . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, per Output, I_O
    For -0.5V < V_O < V_CC + 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . . ±35mA
DC Output Source or Sink Current per Output Pin, I_O
    For V_O > -0.5V or V_O < V_CC + 0.5V . . . . . . . . . . . . . . . . . . . . .±25mA
DC V_CC or Ground Current, I_CC . . . . . . . . . . . . . . . . . . . . . . . . . .±70mA


Description

The 'HC240 and 'HCT240 are inverting three-state buffers having two active-low output enables. The CD74HC241, 'HCT241, 'HC244 and 'HCT244 are non-inverting threestate buffers that differ only in that the 241 has one activehigh and one active-low output enable, and the 244 has two active-low output enables. All three types have identical pinouts.