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74ACT245T

OCTAL BUS TRANSCEIVER (3-STATE)

STMicroelectronics 

®

74ACT245

OCTAL BUS TRANSCEIVER (3-STATE)

s HIGH SPEED: tPD = 5.5 ns (TYP.) at VCC = 5V

s LOW POWER DISSIPATION:

ICC = 8 µA (MAX.) at TA = 25 oC

s COMPATIBLE WITH TTL OUTPUTS

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

s 50Ω TRANSMISSION LINE OUTPUT DRIVE

CAPABILITY

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 24 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 245

s IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The ACT245 is an advanced CMOS OCTAL BUS

TRANSCEIVER (3-STATE) fabricated with

sub-micron silicon gate and double-layer metal

wiring C2MOS technology. It is ideal for low

power applications mantaining high speed

operation similar to equivalent Bipolar Schottky

TTL.

This IC is intended for two-way asynchronous

communication between data buses and the

PIN CONNECTION AND IEC LOGIC SYMBOLS

B

(Plastic Package)

ORDER CODES :

74ACT245B

74ACT245M

74ACT245T

M

(Micro Package)

T

(TSSOP Package)

direction of data trasmission is determined by

DIR input. The enable input G can be used to

disable the device so that the buses are

effectively isolated.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

IT IS PROHIBITED TO APPLY A SIGNAL TO A

TERMINAL WHEN IT IS IN OUTPUT MODE

AND WHEN A BUS THERMINAL IS FLOATING

(HIGH IMPEDANCE STATE) IT IS REQUESTED

TO FIX THE INPUT LEVEL BY MEANS OF

EXTERNAL PULL DOWN OR PULL UP

RESISTOR.

May 1999

1/9

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