Motorola MC74AC258 MC74ACT258 Data Handbook
Summary
The MC74AC258/74ACT258 is a quad 2-input multiplexer featuring 3-state outputs, designed to select four bits of data from two distinct sources using a single select input. This comprehensive manual serves electronics designers and engineers by detailing the device's functional operation, including logic equations for signal selection. It provides critical technical specifications such as maximum ratings, electrical characteristics (DC/AC), pin definitions, and performance graphs necessary for reliable circuit integration into bus-oriented systems.
Page 1 Text Content
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QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
The MC74AC258/74ACT258 is a quad 2-input multiplexer with 3-state outputs. Four bits of data from two sources can be selected using a common data select input. The four outputs present the selected data in the complement (inverted) form. The outputs may be switched to a high impedance state with a HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. Multiplexer Expansion by Tying Outputs Together Inverting 3-State Outputs Outputs Source/Sink 24 m A
N SUFFIX
′ACT258 Has TTL Compatible Inputs
CASE 648-08 PLASTIC
VCC OE I0c I1c Zc I0d I1d Zd
PIN NAMES
Common Data Select Input D SUFFIX CASE 751B-05
OE 3-State Output Enable Input
PLASTIC
I0a–I0d Data Inputs from Source 0 I1a–I1d Data Inputs from Source 1 I0a I1a Za I0b I1b Zb GND Za–Zd 3-State Multiplexer Outputs
TRUTH TABLE LOGIC SYMBOL
Output Select Data
Outputs
Enable Input Inputs
OE I0a I1a I0b I1b I0c I1c I0d I1d
OE I0 I1
Za Zb Zc Zd
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance
FACT DATA 5-1
Page Summary Contents For Motorola MC74AC258 MC74ACT258 Data Handbook
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 8 |
| File Size | 180.38 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
How are the outputs switched to high impedance?
The outputs can switch to a high impedance state with a HIGH voltage on the common Output Enable (OE) input.
What must be considered when tying outputs together?
When tying devices, all but one device must be in a low select input to avoid high currents and potential damage.
Does the MC74AC258/74ACT258 provide inverted data?
Yes, the four outputs present the selected data in an inverted form.
What is the maximum DC output current for the AC type?
The DC Output Sink/Source Current per Pin for 3.0V is ±12 mA; for 5.5V it is ±24 mA.