74VHCT257A_04 datasheet(1/13 Pages) STMICROELECTRONICS

No de pièce	74VHCT257A

Description	QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

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December 2004

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HIGH SPEED: tPD = 4.8 ns (TYP.) at VCC = 5V

s

LOW POWER DISSIPATION:

ICC = 4 µA (MAX.) at TA=25°C

s

COMPATIBLE WITH TTL OUTPUTS:

VIH = 2V (MIN.), VIL = 0.8V (MAX)

s

POWER DOWN PROTECTION ON INPUTS

& OUTPUTS

s

SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8 mA (MIN)

s

BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s

OPERATING VOLTAGE RANGE:

VCC(OPR) = 4.5V to 5.5V

s

PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

s

IMPROVED LATCH-UP IMMUNITY

s

LOW NOISE: VOLP = 0.8V (MAX.)

DESCRIPTION

The 74VHCT257A is an advanced high-speed

CMOS

QUAD

2-CHANNEL

MULTIPLEXER

(3-STATE) fabricated with sub-micron silicon gate

and double-layer metal wiring C2MOS technology.

It is composed of four independent 2-channel

multiplexers with common SELECT and ENABLE

INPUT(OE). The VHCT257A is a non-inverting

multiplexer. When the ENABLE INPUT is held

"High", all outputs become high impedance state.

If SELECT INPUT is held "Low", "A" data is

selected, when SELECT INPUT is "High", "B" data

is chosen.

Power down protection is provided on all inputs

and outputs and 0 to 7V can be accepted on

inputs with no regard to the supply voltage. This

device can be used to interface 5V to 3V since all

inputs are equipped with TTL threshold.

All

inputs

and

outputs

are

equipped

with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

74VHCT257A

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

Figure 1: Pin Connection And IEC Logic Symbols

Table 1: Order Codes

PACKAGE

T & R

SOP

74VHCT257AMTR

TSSOP

74VHCT257ATTR

TSSOP

SOP

Rev. 3

Numéro de pièce similaire - 74VHCT257A_04

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STMicroelectronics	74VHCT257AM	70Kb / 10P	QUAD 2 CHANNEL MULTIPLEXER 3-STATE
	74VHCT257AMTR	70Kb / 10P	QUAD 2 CHANNEL MULTIPLEXER 3-STATE
	74VHCT257ATTR	70Kb / 10P	QUAD 2 CHANNEL MULTIPLEXER 3-STATE

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Description similaire - 74VHCT257A_04

Fabricant	No de pièce	Fiches technique	Description
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Toshiba Semiconductor	TC7MH257FK	189Kb / 7P	Quad 2-Channel Multiplexer (3-State)
Toshiba Semiconductor	TC74HC257AP	264Kb / 8P	Quad 2-Channel Multiplexer (3-state)
STMicroelectronics	74ACT257	286Kb / 11P	QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
	M54HCT257	255Kb / 12P	HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE, INVERTING
	74VHC257	315Kb / 14P	QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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74VHCT257A Fiches technique(PDF) 1 Page - STMicroelectronics

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