HD74AC157 Quad 2-Input Multiplexer Description The HD74AC157 is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four outputs present the selected data in the true (noninverted) form. The HD74AC157 can also be used as a function generator. Feature • Outputs Source/Sink 24 mA Pin Arrangement S 1 16 VCC I0a 2 15 E I1a 3 14 I0c Za 4 13 I1c I0b 5 12 Zc I1b 6 11 I0d Zb 7 10 I1d GND 8 9 Zd (Top view) HD74AC157 Logic Symbol E I0a I1a I0b I1b I0c I1c Iod I1d S Za Zb Zc Zd Pin Names I0a to I0d I1a to I1d E S Za to Zd Source 0 Data Inputs Source 1 Data Inputs Enable Input Select Input Outputs Functional Description The HD74AC157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active-Low. when E is High, all of the outputs (Z) are forced Low regardless of all other inputs. The HD74AC157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Za = E•(I1a•S + I0a •S) Zb = E•(I1b•S + I0b•S) Zc = E•(I1c•S + I0c •S) Zd = E•(I1d•S + I0d•S) A common use of the HD74AC157 is the moving of data from two groups of register to four common output busses. The particular register from which the data comes is determined by the state of the Select input. A less obvious use is as a function generator. The HD74AC157 can generate any four of the sixteen different functions of two variables with one variable common. This is useful for implementing gating functions. 2 HD74AC157 Truth Table Inputs Output E S I0 I1 Z H X X X L L H X L L L H X H H L L L X L L L H X H H : L : X : High Voltage Level Low Voltage Level Immaterial Logic Diagram I0a I1a Za I0b I1b Zb I0c I1c Zc I0d I1d E S Zd Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 HD74AC157 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C AC Characteristics: HD74AC157 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 7.0 11.5 1.0 13.0 ns 5.0 1.0 5.5 9.0 1.0 10.0 3.3 1.0 6.5 11.0 1.0 12.0 5.0 1.0 5.0 8.5 1.0 9.5 3.3 1.0 7.0 11.5 1.0 13.0 5.0 1.0 5.5 9.0 1.0 10.0 3.3 1.0 6.5 11.0 1.0 12.0 5.0 1.0 5.5 9.0 1.0 9.5 3.3 1.0 5.0 8.5 1.0 9.0 5.0 1.0 4.0 6.5 1.0 7.0 3.3 1.0 5.0 8.0 1.0 9.0 5.0 1.0 4.0 6.5 1.0 7.0 S to Zn Propagation delay t PHL S to Zn Propagation delay t PLH E to Zn Propagation delay t PHL E to Zn Propagation delay t PLH I n to Zn Propagation delay t PHL I n to Zn Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 50.0 pF VCC = 5.0 V 4 ns ns ns ns ns Unit: mm 19.20 20.00 Max 1 7.40 Max 9 6.30 16 8 1.3 0.48 ± 0.10 2.54 Min 5.06 Max 2.54 ± 0.25 0.51 Min 1.11 Max 7.62 + 0.13 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 9 1 8 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 16 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA — Conforms 0.24 g Unit: mm 9.9 10.3 Max 9 1 8 0.635 Max *0.42 ± 0.08 0.40 ± 0.06 0.15 *0.22 ± 0.03 0.20 ± 0.03 1.27 0.11 0.14 +– 0.04 1.75 Max 3.95 16 0.10 6.10 +– 0.30 1.08 0° – 8° 0.67 0.60 +– 0.20 0.25 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DN Conforms Conforms 0.15 g Unit: mm 4.40 5.00 5.30 Max 16 9 1 8 0.65 0.13 M 1.10 Max 0.65 Max 0.10 *Dimension including the plating thickness Base material dimension 6.40 ± 0.20 0.07 +0.03 –0.04 0.20 ± 0.06 1.0 *0.17 ± 0.05 0.15 ± 0.04 0.08 *0.22 +– 0.07 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-16DA — — 0.05 g Cautions 1. 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