74VHC257T datasheet(1/14 Pages) STMICROELECTRONICS

Il numero della parte	74VHC257T

Spiegazioni elettronici	QUAD 2 CHANNEL MULTIPLEXER 3-STATE

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November 2004

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HIGH SPEED: tPD = 3.7ns (TYP.) at VCC = 5V

s

LOW POWER DISSIPATION:

ICC = 4 µA (MAX.) at TA=25°C

s

HIGH NOISE IMMUNITY:

VNIH = VNIL = 28% VCC (MIN.)

s

POWER DOWN PROTECTION ON INPUTS

s

SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8mA (MIN)

s

BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s

OPERATING VOLTAGE RANGE:

VCC(OPR) = 2V to 5.5V

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PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

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IMPROVED LATCH-UP IMMUNITY

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LOW NOISE: VOLP = 0.8V (MAX.)

DESCRIPTION

The 74VHC257 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

(OE) INPUT. The VHC257 is a non-inverting

multiplexer. When the ENABLE INPUT is held

"High", all outputs become in 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 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.

All

inputs

and

outputs

are

equipped

with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

74VHC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

Figure 1: Pin Connection And IEC Logic Symbols

Table 1: Order Codes

PACKAGE

T & R

SOP

74VHC257MTR

TSSOP

74VHC257TTR

TSSOP

SOP

Rev. 4

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