Datasheet

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May 1995

Revised February 2001

74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs

74LCX157

Low Voltage Quad 2-Input Multiplexer

with 5V Tolerant Inputs

General Description

The LCX157 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 LCX157 can also be used as a function generator.

The 74LCX157 is fabricated with advanced CMOS technol-

ogy to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

■ 5V tolerant inputs

■ 2.3V–3.6V V

specifications provided

■ 5.8 ns t

max (V

= 3.3V), 10 µA I

max

■ Power down high impedance inputs and outputs

■

±24 mA output drive (V

= 3.0V)

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 500 mA

■ ESD performance:

Human body model

> 2000V

Machine model

> 200V

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number Package Number Package Description

74LCX157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

74LCX157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX157MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

–I

Source 0 Data Inputs

–I

Source 1 Data Inputs

Enable Input

S Select Input

–Z

Outputs

Summary of content (9 pages)

PAGE 1
Revised February 2001 74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs General Description Features The LCX157 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 LCX157 can also be used as a function generator.
PAGE 2
74LCX157 Functional Description Truth Table The LCX157 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 LCX157 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.
PAGE 3
Symbol Parameter Value Conditions VCC Supply Voltage −0.5 to +7.0 VI DC Input Voltage −0.5 to +7.0 VO DC Output Voltage IIK DC Input Diode Current −50 VI < GND IOK DC Output Diode Current −50 VO < GND +50 VO > VCC Units V V −0.5 to VCC + 0.
PAGE 4
74LCX157 AC Electrical Characteristics TA = −40°C to +85°C, RL = 500Ω Symbol Parameter VCC = 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V CL = 50 pF CL = 50 pF CL = 30 pF Min Max Min Max Min Max tPHL Propagation Delay 1.5 7.0 1.5 8.0 1.5 8.4 tPLH S→Zn 1.5 7.0 1.5 8.0 1.5 8.4 tPHL Propagation Delay 1.5 7.0 1.5 8.0 1.5 8.4 tPLH E→Zn 1.5 7.0 1.5 8.0 1.5 8.4 tPHL Propagation Delay 1.5 5.8 1.5 6.3 1.5 7.0 tPLH In→Zn 1.5 5.8 1.5 6.3 1.5 7.
PAGE 5
74LCX157 AC LOADING and WAVEFORMS Generic for LCX Family FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) Test Switch tPLH, tPHL Open tPZL, tPLZ 6V at VCC = 3.3 ± 0.3V VCC x 2 at VCC = 2.5 ± 0.2V tPZH, tPHZ GND Waveform for Inverting and Non-Inverting Functions 3-STATE Output Low Enable and Disable Times for Logic Propagation Delay.
PAGE 6
74LCX157 Schematic Diagram Generic for LCX Family www.fairchildsemi.
PAGE 7
4LCX157 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 7 www.fairchildsemi.
PAGE 8
74LCX157 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D www.fairchildsemi.
PAGE 9
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.