TOSHIBA TC74AC257P, TC74AC257F, TC74AC257FN, TC74AC258P, TC74AC258F Technical data

TC74AC257,258P/F/FN

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

TC74AC257P,TC74AC257F,TC74AC257FN

TC74AC258P,TC74AC258F,TC74AC258FN

TC74AC257P/F/FN 2-Channel Multiplexer (3-state)

TC74AC258P/F/FN 2-Channel Multiplexer (3-state,

inverting)

The TC74AC257 and TC74AC258 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 TC74AC258 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 inputs are equipped with protection circuits against static discharge or transient excess voltage.

Features

•High speed: tpd = 3.6 ns (typ.) at VCC = 5 V

•Low power dissipation: ICC = 8 μA (max) at Ta = 25°C

•High noise immunity: VNIH = VNIL = 28% VCC (min)

•Symmetrical output impedance: |IOH| = IOL = 24 mA (min)

Capability of driving 50 Ω transmission lines.

•Balanced propagation delays: tpLH − tpHL

•Wide operating voltage range: VCC (opr) = 2~5.5 V

•Pin and function compatible with 74F257/258

Note: xxxFN (JEDEC SOP) is not available in Japan.

TC74AC257P, TC74AC258P

TC74AC257F, TC74AC258F

TC74AC257FN, TC74AC258FN

Weight
DIP16-P-300-2.54A	: 1.00 g (typ.)
SOP16-P-300-1.27A	: 0.18 g (typ.)
SOL16-P-150-1.27	: 0.13 g (typ.)

1	2007-10-01

TC74AC257,258P/F/FN

Pin Assignment

TC74AC257

TC74AC258

IEC Logic Symbol

TC74AC257

TC74AC258

Truth Table

			Inputs				Outputs
	OE		SELECT		A	B	Y (257)		Y		(258)
	H		X		X	X	Z				Z
	L		L		L	X	L				H
	L		L		H	X	H				L
	L		H		X	L	L				H
	L		H		X	H	H				L

X: Don’t care

Z: High impedance

2	2007-10-01

TC74AC257,258P/F/FN

System Diagram

TC74AC257

TC74AC258

Absolute Maximum Ratings (Note 1)

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	°C

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°C. From Ta = 65 to 85°C a derating factor of −10 mW/°C should be applied up to 300 mW.

3	2007-10-01