HD74AC158 HITACHI
Document overview
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Technical content
Description
The HD74AC158 is a high-speed quad 2-input multiplexer. It selects four bits of data from two source using the common Select and Enable inputs. The four buffered outputs present the selected data in the inverted form. The HD74AC158 can also be used as a function generator. Feature
- Outputs Source/Sink 24 mA Pin Arrangement S I I1a Za I0b Zb I1b GND VCC E I0c I1c Zc I0d I1d Zd (Top view)
S EI 0a Za Zb Zc Zd I1a I0b I0c I1c Iod I1dI1b Pin Names I0a to I0d Source 0 Data Inputs I1a to I1d Source 1 Data Inputs E Enable Input S Select Input Z a to Zd Outputs Functional Description The HD74AC158 quad 2-input multiplexer selects four bits of data from two sources under the control of a common Select input (S) and presents the data in inverted form at the four outputs. The Enable Input (E) is active-LOW. When E is HIGH, all of the outputs (Z) are forced HIGH regardless of all other inputs. The HD74AC158 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. A common use of the HD74AC158 is the moving of data from two groups of registers 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 HD74AC158 can generate four functions of two variables with one variable common. This is useful for implementing gating functions.
H : High Voltage Level L : Low Voltage Level X : Immaterial Logic Diagram Za Zb Zc Zd I0a I1a I0b I1b I0c I1c I0d I1d SE Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current ICC 80 mAV IN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current ICC 8.0 mAV IN = VCC or ground, VCC = 5.5 V, Ta = 25°C AC Characteristics: HD74AC158 Ta = +25°C C L = 50 pF Ta = –40°C to +85°C C L = 50 pF Item Symbol V CC (V)*1 Min Typ Max Min Max Unit 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 C IN 4.5 pF V CC = 5.5 V Power dissipation capacitance C PD 45.0 pF V CC = 5.0 V
(reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 6.30 19.20 16 9 1.3
20.00 Max
7.40 Max
7.62 0.25 + 0.13
0.51 Min
2.54 Min5.06 Max 0° – 15°
1.11 Max
(reference value) FP-16DA Conforms 0.24 g Unit: mm *Dimension including the plating thickness Base material dimension *0.22 – 0.05 *0.42 – 0.08 0.12 0.15 M
2.20 Max
5.5 10.06
0.80 Max
10.5 Max
+ 0.20 – 0.307.80 0.70 – 0.20 0° – 8° 0.10 – 0.10 1.15 1.27 0.40 – 0.06 0.20 – 0.04
(reference value) FP-16DN Conforms Conforms 0.15 g Unit: mm *Dimension including the plating thickness Base material dimension 1.27 16 9 1 8 0.15 0.25 M 1.75 Max 3.95 *0.22 – 0.03 9.9 0° – 8°
10.3 Max
+ 0.10 – 0.306.10 + 0.67 – 0.20 0.60 + 0.11 – 0.04 0.14 *0.42 – 0.08
0.635 Max
0.40 – 0.06 0.20 – 0.03 1.08
(reference value) TTP-16DA 0.05 g Unit: mm *Dimension including the plating thickness Base material dimension 0.50 – 0.100° – 8° *0.17 – 0.05 6.40 – 0.20 0.10
1.10 Max
0.13 M 0.65 16 9 4.40 5.00
5.30 Max
0.07+0.03 –0.04
0.65 Max
1.0 0.20 – 0.06 + 0.08 – 0.07*0.22 0.15 – 0.04
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