HD74LS155 Dual 2-line-to-4-line Decoders / Demultiplexers REJ03D0440–0200 Rev.2.00 Feb.18.2005 This circuit features dual 1-line-to-4-line demultiprexer with individual strobes and common binary-address input. When both sections are enabled by the strobes, the common binary-address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections as desired. Data applied to input 1C is inverted through its outputs. The inverter following the 1C data input permits use as a 3-to-8-line decoder or 1-to-8-line demultiplexer without external gating. Features • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation Taping Abbreviation (Quantity) HD74LS155P DILP-16 pin PRDP0016AE-B (DP-16FV) P — Note: Please consult the sales office for the above package availability. Pin Arrangement Data 1C 1 16 VCC Strobe 1G 2 15 Data 2C Select Input B 3 14 Strobe 2G 1Y3 4 1Y3 1G 1C 13 Select Input A 1Y2 5 1Y2 2G 2Y3 2C 12 2Y3 1Y1 6 1Y1 2Y2 11 2Y2 1Y0 7 1Y0 2Y1 10 2Y1 GND 8 2Y0 9 2Y0 Outputs B B A A B B A A (Top view) Rev.2.00, Feb.18.2005, page 1 of 6 Outputs HD74LS155 Function Table • 2-line-to-4-line Decoder / 1-line-to-4-line Demultiplexer Inputs Select B X L L H H X A X L H L H X Outputs Strobe 1G H L L L L X Data 1C X H H H H L Data 2C X L L L L H 1Y0 1Y1 1Y2 1Y3 H L H H H H H H L H H H H H H L H H H H H H L H Inputs Select Outputs B X L L H A X L H L Strobe 2G H L L L H X H X L X 2Y0 2Y1 2Y2 2Y3 H L H H H H L H H H H L H H H H H H H H H H L H • 3-line-to-8-line Decoder / 1-line-to-8-line Demultiplexer Inputs Strobe Select 0 Data C B A G 2Y0 X X X H H L L L L L L L H L H L H L L H L H H L H H L L L H H L H L H H H L L H H H H L H Notes: 1. C ; input 1C and 2C connected together 2. G ; inputs 1G and 2G connected together 3. H ; high level, L ; low level, X ; irrelevant Rev.2.00, Feb.18.2005, page 2 of 6 Outputs 1 2 3 4 5 6 7 2Y1 H H L H H H H H H 2Y2 H H H L H H H H H 2Y3 H H H H L H H H H 1Y0 H H H H H L H H H 1Y1 H H H H H H L H H 1Y2 H H H H H H H L H 1Y3 H H H H H H H H L HD74LS155 Block Diagram Strobe 1G 1Y0 Data 1C 1Y1 Select B 1Y2 1Y3 Outputs 2Y0 Select A Data 2C 2Y1 2Y2 Strobe 2G 2Y3 Absolute Maximum Ratings Item Symbol Ratings Unit Supply voltage VCC 7 V Input voltage VIN 7 V PT 400 mW Tstg –65 to +150 °C Power dissipation Storage temperature Note: Voltage value, unless otherwise noted, are with respect to network ground terminal. Recommended Operating Conditions Item Supply voltage Output current Operating temperature Symbol Min Typ Max Unit VCC 4.75 5.00 5.25 V IOH — — –400 µA IOL — — 8 mA Topr –20 25 75 °C Electrical Characteristics (Ta = –20 to +75 °C) Item Input voltage Symbol VIH VIL min. 2.0 — typ.* — — max. — 0.8 Unit V V VOH 2.7 — — V — — — — — — — — — — 0.4 0.5 20 –0.4 0.1 Output voltage VOL Input current IIH IIL II V µA mA mA Condition VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = –400 µA IOL = 4 mA VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V IOL = 8 mA VCC = 5.25 V, VI = 2.7 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V, VI = 7 V Short-circuit output IOS –5 — –42 mA VCC = 5.25 V current Supply current** ICC — 6.1 10 mA VCC = 5.25 V Input clamp voltage VIK — — –1.5 V VCC = 4.75 V, IIN = –18 mA Notes: * VCC = 5 V, Ta = 25°C ** ICC is measured with outputs open, A, B, and 1C inputs at 4.5 V, and 2C, 1G, and 2G inputs grounded. Rev.2.00, Feb.18.2005, page 3 of 6 HD74LS155 Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Propagation delay time Symbol Inputs Output Levels of logic tPLH tPHL tPLH tPHL tPLH A, B, 2C 1G or 2G Y 2 A or B Y 3 1C Y 3 tPHL min. typ. max. Unit Condition — — — — — — 10 19 17 19 18 18 15 30 26 30 27 27 ns ns ns ns ns ns CL = 15 pF, RL = 2 kΩ Testing Method Test Circuit VCC Output 4.5V RL Load circuit 1 1Y0 CL 1G P.G. Zout = 50Ω See Testing Table Input 1C Output 1Y1 B A 2C Same as Load Circuit 1. Output 1Y2 Same as Load Circuit 1. Output 1Y3 Same as Load Circuit 1. Output 2G 2Y0 Same as Load Circuit 1. Output 2Y1 Same as Load Circuit 1. Output 2Y2 Same as Load Circuit 1. Output 2Y3 Notes: 1. CL includes probe and jig capacitance. 2. All diodes are 1S2074(H). Rev.2.00, Feb.18.2005, page 4 of 6 Same as Load Circuit 1. HD74LS155 Waveform tTLH tTHL 90% 1.3 V Input 3V 90% 1.3 V 10% 10% 0V tPHL tPLH VOH In phase output 1.3 V 1.3 V VOL tPHL tPLH VOH Out of phase output 1.3 V 1.3 V VOL Note: Input pulse; tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz, duty cycle 50% Rev.2.00, Feb.18.2005, page 5 of 6 HD74LS155 Package Dimensions JEITA Package Code P-DIP16-6.3x19.2-2.54 RENESAS Code PRDP0016AE-B MASS[Typ.] 1.05g Previous Code DP-16FV D 9 E 16 1 8 b3 0.89 Z A1 A Reference Symbol L e e bp Dimension in Millimeters Min D 19.2 E 6.3 A θ c e1 A1 0.51 b p 0.40 b 3 20.32 7.4 0.48 0.56 1.30 c 0.19 θ 0° e 2.29 L Max 5.06 Z ( Ni/Pd/Au plating ) Rev.2.00, Feb.18.2005, page 6 of 6 Nom 7.62 1 0.25 0.31 2.54 2.79 15° 1.12 2.54 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. 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