HD74LS251 1 of 8 Data Selector / Multiplexer (with strobe and three-state outputs) REJ03D0467–0300 Rev.3.00 Jul.15.2005 This data selector / multiplexer contains full on-chip binary decoding to select one-of-eight data sources and features a strobe-controlled 3-state output. The strobe must be at a low logic level to enable this device. The 3-state outputs permit a number of outputs to be connected to a common bus. When the strobe input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low, the outputs are activated and operate as standard TTL totem-pole outputs. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable time is shorter than the average output enable time. Features • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation Taping Abbreviation (Quantity) HD74LS251P DILP-16 pin PRDP0016AE-B (DP-16FV) P — HD74LS251FPEL SOP-16 pin (JEITA) PRSP0016DH-B (FP-16DAV) FP EL (2,000 pcs/reel) Note: Please consult the sales office for the above package availability. Pin Arrangement 3 1 16 VCC D3 2 2 D2 D4 15 4 1 3 D1 D5 14 5 0 4 D0 D6 13 6 Y 5 Y D7 12 7 W 6 W A 11 A Strobe 7 S B 10 B GND 8 9 C Data Inputs Data Inputs Outputs C (Top view) Rev.3.00, Jul.15.2005, page 1 of 5 Data Select HD74LS251 Function Table Inputs Select B X L L H H L L H H C X L L L L H H H H Outputs Strobe S H L L L L L L L L A X L H L H L H L H Y W Z D0 D1 D2 D3 D4 D5 D6 D7 Z D0 D1 D2 D3 D4 D5 D6 D7 Notes: 1. H; high level, L; low level, X; irrelevant 2. Z; high impedance (off-state) 3. D0 through D7; the level of the respective D input. Block Diagram Strobe (Enable) D0 D1 D2 Data Inputs Output Y D3 Output W D4 D5 D6 D7 A A Data Select (Binary) A B B C C B C Absolute Maximum Ratings Item Supply voltage Input voltage Symbol Ratings Unit VCC 7 V VIN 7 V Output voltage (off-state) VO (off) 5.5 V Operating temperature Topr –20 to +75 °C 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. Rev.3.00, Jul.15.2005, page 2 of 5 HD74LS251 Recommended Operating Conditions Item Supply voltage Output current Operating temperature Symbol Min Typ Max Unit VCC 4.75 5.00 5.25 V IOH — — –2.6 mA 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 2.4 — — V VOL — — — — 0.4 0.5 V — — — — — — 20 –0.4 0.1 µA mA mA VCC = 5.25 V, VI = 2.7 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V, VI = 7 V Output voltage Input current IIH IIL II Condition VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = –2.6 mA IOL = 4 mA VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V IOL = 8 mA Output current IOZ — — — — 20 –20 µA VO = 2.7 V VO = 0.4 V Short-circuit output current IOS –30 — –130 mA VCC = 5.25 V Supply current** ICC — — — 6.1 7.1 — 10 12 –1.5 VCC = 5.25 V, VIH = 2 V Condition A VCC = 5.25 V Condition B VCC = 4.75 V, IIN = –18 mA mA Input clamp voltage VIK V Notes: * VCC = 5 V, Ta = 25°C ** ICC is measured with the outputs open and all data and select inputs at 4.5 V under the following conditions. A; Strobe grounded, B; Strove at 4.5 V Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Propagation delay time Output enable time Output disable time Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tZH tZL tZH tZL tHZ tLZ tHZ tLZ Rev.3.00, Jul.15.2005, page 3 of 5 Inputs Outputs A, B, C (4 level) Y A, B, C (3 level) W Data Y Data W Strobe Y Strobe W Strobe Y Strobe W min. — — — — — — — — — — — — — — typ. 29 28 20 21 17 18 10 9 30 26 17 24 30 15 max. 45 45 33 33 28 28 15 15 45 40 27 40 45 25 — — 37 15 55 25 Unit Condition ns CL = 15 pF, RL = 2 kΩ ns ns CL = 5 pF, RL = 2 kΩ HD74LS251 Testing Method Test Circuit VCC 4.5V Load circuit 1 RL S See Function Table Input P.G. Zout = 50Ω Notes: Output D0 D1 D2 D3 D4 D5 D6 D7 A B C S1 W 5kΩ CL S2 Output Same as Load Circuit 1. Y 1. CL includes probe and jig capacitance. 2. All diodes are 1S2074(H). Waveform tTHL 90% 1.3V Enable tTLH 3V 10% 0V 10% 3V 90% 1.3V 0V tZL 4.5V Waveform 1 S1 closed, S2 open tLZ S1 and, S2 closed 1.3V VOL tZH VOL tHZ 0.5V VOH Waveform 2 S1 open, S2 closed Notes: 1.5V VOH 1.5V 1.3V 0V 0.5V S1 and, S2 closed 1. Input pulse; tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz, duty cycle = 50% 2. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. 3. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. Rev.3.00, Jul.15.2005, page 4 of 5 HD74LS251 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 Nom θ c e1 D 19.2 E 6.3 JEITA Package Code P-SOP16-5.5x10.06-1.27 RENESAS Code PRSP0016DH-B *1 Previous Code FP-16DAV 7.4 A1 0.51 b p 0.40 b 3 0.48 0.56 1.30 c 0.19 θ 0° e 2.29 0.25 0.31 2.54 2.79 15° 1.12 L 2.54 MASS[Typ.] 0.24g NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET. D F 16 20.32 5.06 Z ( Ni/Pd/Au plating ) Max 7.62 1 A bp e Dimension in Millimeters Min 9 c HE *2 E bp Index mark Reference Symbol Terminal cross section ( Ni/Pd/Au plating ) 1 Z *3 bp Nom D 10.06 E 5.50 Max 10.5 A2 8 e Dimension in Millimeters Min x A1 M 0.00 0.10 0.34 0.40 0.46 0.15 0.20 0.25 7.80 8.00 A L1 0.20 2.20 bp b1 c A c A1 θ y L Detail F 1 θ 0° HE 7.50 e 1.27 x 0.12 y 0.15 0.80 Z L L Rev.3.00, Jul.15.2005, page 5 of 5 8° 0.50 1 0.70 1.15 0.90 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. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. 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