74VHC244 データシートの表示（PDF） - STMicroelectronics

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74VHC244

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED)

STMicroelectronics 

74VHC244

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (NON INVERTED)

s HIGH SPEED: tPD = 3.9 ns (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 = 8 mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC(OPR) = 2V to 5.5V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 244

s IMPROVED LATCH-UP IMMUNITY

s LOW NOISE: VOLP = 0.9V (MAX.)

DESCRIPTION

The 74VHC244 is an advanced high-speed

CMOS OCTAL BUS BUFFER (3-STATE)

fabricated with sub-micron silicon gate and

double-layer metal wiring C2MOS technology.

G output enable governs four BUS BUFFERs.

This device is designed to be used with 3 state

memory address drivers, etc.

SOP

TSSOP

Table 1: Order Codes

PACKAGE

SOP

TSSOP

T&R

74VHC244MTR

74VHC244TTR

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.

Figure 1: Pin Connection And IEC Logic Symbols

November 2004

Rev. 3

1/12

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