TC74AC258F

Features:

• High speed: t_pd = 3.6 ns (typ.) at V_CC = 5 V
• Low power dissipation: I_CC = 8 A (max) at Ta = 25
• High noise immunity: V_NIH = V_NIL = 28% V_CC (min)
• Symmetrical output impedance: |I_OH| = I_OL = 24 mA (min) Capability of driving 50 transmission lines.
• Balanced propagation delays: t_pLH ∼ − t_pHL
• Wide operating voltage range: V_CC (opr) = 2~5.5 V
• Pin and function compatible with 74F257/258


Pinout




Specifications

Characteristics	Symbol	Rating	Unit
Supply voltage range	VCC	−0.5~7.0	V
DC input voltage	VIN	−0.5~VCC + 0.5	V
DC output voltage	VOUT	−0.5~VCC + 0.5	V
Input diode current	IIK	±20	mA
Output diode current	IOK	±50	mA
DC output current	IOUT	±50	mA
DC VCC/ground current	ICC	±100	mA
Power dissipation	PD	500 (DIP) (Note 2)/180 (SOP)	mW
Storage temperature	Tstg	−65~150

Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance 
            or even destruction.

           Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
           significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
           even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
           maximum ratings and the operating ranges.

          Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
          ("Handling Precautions"/Derating Concept and Methods) and individual reliability data (i.e. reliability test
          report and estimated failure rate, etc).

Note 2: 500 mW in the range of Ta = −40~65. From Ta = 65 to 85 a derating factor of −10 mW/should be
             applied up to 300 mW.


Description

The TC74AC257 and TC74AC258F are advanced high speed CMOS MULTIPLEXERs fabricated with silicon gate and double-layer metal wiring C2MOS technology.

They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.

Each is composed of four independent 2-channel multiplexers with common SELECT and  OUTPUT ENABLE(OE ).

The TC74AC257 is a non-inverting multiplexer, while the TC74AC258F is an inverting.

If OE is set low, the outputs are held in a high-impedance state. When SELECT is set low, "A" data inputs are enabled. Conversely, when SELECT is high, "B" data inputs are enabled.

All TC74AC258F inputs are equipped with protection circuits against static discharge or transient excess voltage.