Datasheet

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May 1995

Revised September 2000

74LCX257 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs

74LCX257

Low Voltage Quad 2-Input Multiplexer

with 5V Tolerant Inputs and Outputs

General Description

The LCX257 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 true (non inverted) form. The

outputs may be switched to a high impedance state by

placing a logic HIGH on the common Output Enable (OE

)

input, allowing the outputs to interface directly with bus-ori-

ented systems.

The 74LCX257 is fabricated with advanced CMOS technol-

ogy to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

specifications provided

■ 6.0 ns t

max (V

= 3.3V, I

→ Z

), 10 µA I

max

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 500 mA

■ ESD performance:

Human body model

> 2000V

Machine model

> 200V

Note 1: To ensure the high-impedance state during power up or down, OE

should be tied to V

through a pull-up resistor: the minimum value or the

resistor is determined by the current-sourcing capability of the driver.

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

74LCX257M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

74LCX257SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX257MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

S Common Data Select Input

OE 3-STATE Output Enable Input

–I

Data Inputs from Source 0

–I

Data Inputs from Source 1

–Z

3-STATE Multiplexer Outputs

Summary of content (9 pages)

PAGE 1
Revised September 2000 74LCX257 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs General Description Features The LCX257 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 true (non inverted) form.
PAGE 2
74LCX257 Functional Description Truth Table The LCX257 is a quad 2-input multiplexer with 3-STATE outputs. It selects four bits of data from two sources under control of a Common Data Select input. When the Select input is LOW, the I0x inputs are selected and when Select is HIGH, the I1x inputs are selected. The data on the selected inputs appears at the outputs in true (non inverted) form.
PAGE 3
Symbol Parameter Value VCC Supply Voltage −0.5 to +7.0 VI DC Input Voltage −0.5 to +7.0 VO DC Output Voltage −0.5 to +7.0 Conditions Units V V Output in 3-STATE −0.5 to VCC + 0.
PAGE 4
74LCX257 DC Electrical Characteristics Symbol (Continued) Parameter VCC Conditions TA = −40°C to +85°C (V) ICC ∆ICC Quiescent Supply Current Increase in ICC per Input Min Units Max VI = VCC or GND 2.3 − 3.6 10 3.6V ≤ VI, VO ≤ 5.5V (Note 5) 2.3 − 3.6 ±10 VIH = VCC −0.6V 2.3 − 3.6 500 µA µA Note 5: Outputs disabled or 3-STATE only. AC Electrical Characteristics TA = −40°C to +85°C, RL = 500 Ω Symbol Parameter VCC = 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.
PAGE 5
74LCX257 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 High Enable and Disable Times for Logic Propagation Delay.
PAGE 6
74LCX257 Schematic Diagram Generic for LCX Family www.fairchildsemi.
PAGE 7
4LCX257 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
74LCX257 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.