CD74ACT258| Datasheet

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CD54/74AC257, CD54/74ACT257, CD74ACT258
Data sheet acquired from Harris Semiconductor SCHS248A

August 1998 - Revised May 2000

Quad 2-Input Multiplexer with Three-State Outputs
Description
The 'AC257, 'ACT257 and CD74ACT258 are quad 2-input multiplexers with three-state outputs that utilize Advanced CMOS Logic technology. Each of these devices selects four bits of data from two sources under the control of a common Select input (S). The Output Enable (OE) is active LOW. When OE is HIGH, all of the outputs (Y or Y) are in the highimpedance state regardless of all other input conditions. Moving data from two groups of registers to four common output buses is a common use of the 'AC257, 'ACT257, and CD74ACT258. The state of the Select input determines the particular register from which the data comes. The 'AC257, 'ACT257 and CD74ACT258 can also be used as function generators.

Features
'AC257, 'ACT257. . . . . . . . . . . . . Non-Inverting Outputs CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs Buffered Inputs Typical Propagation Delay - 4.4ns at VCC = 5V, TA = 25oC, CL = 50pF Exceeds 2kV ESD Protection MIL-STD-883, Method 3015 SCR-Latchup-Resistant CMOS Process and Circuit Design Speed of Bipolar FASTTM/AS/S with Significantly Reduced Power Consumption Balanced Propagation Delays AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply 24mA Output Drive Current - Fanout to 15 FASTTM ICs Drives 50 Transmission Lines

Ordering Information
PART NUMBER CD54AC257F3A CD74AC257E CD74AC257M TEMP. RANGE (oC) -55 to 125 PACKAGE 16 Ld CERDIP

0 to 70oC, -40 to 85, 16 Ld PDIP -55 to 125 0 to 70oC, -40 to 85, 16 Ld SOIC -55 to 125 -55 to 125 0 to 70oC, -40 to 85, -55 to 125 16 Ld CERDIP 16 Ld PDIP

Pinout
CD54AC257, CD54ACT257 (CERDIP) CD74AC257, CD74ACT257, CD74ACT258 (PDIP, SOIC) TOP VIEW
ACT258 S 1I0 1I1 1Y 2I0 2I1 2Y GND AC/ACT257 S 1 1I0 2 1I1 3 1Y 4 2I0 5 2I1 6 2Y 7 GND 8 AC/ACT257 16 VCC 15 OE 14 4I0 13 4I1 12 4Y 11 3I0 10 3I1 9 3Y ACT258 VCC OE 4I0 4I1 4Y 3I0 3I1 3Y

CD54ACT257F3A CD74ACT257E CD74ACT257M CD74ACT258E CD74ACT258M NOTES:

0 to 70oC, -40 to 85, 16 Ld SOIC -55 to 125 0 to 70oC, -40 to 85, 16 Ld PDIP -55 to 125 0 to 70oC, -40 to 85, 16 Ld SOIC -55 to 125

1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer and die for this part number is available which meets all electrical specifications. Please contact your local TI sales office or customer service for ordering information.

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. FASTTM is a Trademark of Fairchild Semiconductor. Copyright 2000, Texas Instruments Incorporated