74AC257| Datasheet

74AC257, 74AC257MTR, 74AC257TTR

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74AC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s s

HIGH SPEED: tPD = 4.5ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4uA(MAX.) at TA=25 C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) 50 TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY

DIP

SOP

TSSOP

ORDER CODES
PACKAGE DIP SOP TSSOP TUBE 74AC257B 74AC257M T&R 74AC257MTR 74AC257TTR

DESCRIPTION The 74AC257 is an advanced high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. It is composed of four independent 2-channel multiplexer with common SELECT and ENABLE (OE) inputs. It is a non-inverting multiplexer. When the OE input is held HIGH,all the output become in

high impedance state. If SELECT input is held LOW, "A" data is selected, when SELECT input is held HIGH, "B" data is chosen. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

April 2001

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