SN74HC21N

XBLW SN74HC/HCT21 4-Input AND iunction General Description The SN74HC/HCT21 provide the 4-input AND function. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC. Features       Input levels: For SN74HC21: CMOS level For SN74HCT21: TTL level Low-power dissipation Specified from -40℃ to +125℃ Packaging information: DIP14/SOP14/TSSOP14 Ordering Information Product Model XBLW SN74HC21N XBLW SN74HC21DTR XBLW SN74HC21TDTR XBLW SN74HCT21N XBLW SN74HCT21DTR XBLW SN74HCT21TDTR Package Type DIP-14 SOP-14 TSSOP-14 DIP-14 SOP-14 TSSOP-14 Marking 74HC21N 74HC21 74HC21 74HCT21N 74HCT21 74HCT21 Packing Tube Tape Tape Tube Tape Tape Packing Qty 1000Pcs/Box 2500Pcs/Reel 3000Pcs/Reel 1000Pcs/Box 2500Pcs/Reel 3000Pcs/Reel Block Diagram And Pin Description 2.1 Block Diagram Figure 1. Logic symbol Figure 2. IEC logic symbol XBLWversion1.0 www.xinboleic.com Technical Support:4009682003 Support:4009682003 1 / 11 XBLW SN74HC/HCT21 4-Input AND iunction Figure 3. Logic diagram Figure 4. Functional diagram Pin Configurations Pin Description Pin No. 1 Pin Name Description 1A data input 2 1B data input 3 4 n.c. 1C not connected data input 5 1D data input 6 1Y data output 7 GND ground (0V) 8 2Y data output 9 2A data input 10 2B data input 11 12 n.c. 2C not connected data input 13 2D data input 14 VCC supply voltage XBLWversion1.0 www.xinboleic.com Technical Support:4009682003 Support:4009682003 2 / 11 XBLW SN74HC/HCT21 4-Input AND iunction Function Table Input Output nA nB nC nD nY L X X X L X L X X L X X L X L X X X L L H H H H H Note: H=HIGH voltage level; L=LOW voltage level; X = don’t care. Electrical Parameter Absolute Maximum Ratings (Voltages are referenced to GND (ground=0V), unless otherwise specified.) Parameter Symbol supply voltage VCC Conditions Min. -0.5 Max. Unit V mA input clamping current IIK VIVCC+0.5V output clamping current IOK - +7 ±20 VOVCC+0.5V mA output current IO - ±20 -0.5V