74ACT245B

Number of Channels per Chip : 8
Output Type : 3-State
Packaging : Tube
Logic Type : CMOS
Supply Voltage - Max : 5.5 V
Maximum Operating Temperature : + 125 C
High Level Output Current : - 24 mA
Low Level Output Current : 24 mA
Supply Voltage - Min : 4.5 V
Output Level : CMOS
Input Level : TTL
Propagation Delay Time : 8 ns
Logic Family : ACT
Package / Case : DIP-20


Features:

HIGH SPEED: t_PD = 5.4ns (TYP.) at V_CC = 5V
LOW POWER DISSIPATION: I_CC = 4 µA(MAX.) at T_A=25°C
COMPATIBLE WITH TTL OUTPUTS V_IH = 2V (MIN.), V_IL = 0.8V (MAX.)
50Ω TRANSMISSION LINE DRIVING CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE: |I_OH| = I_OL = 24mA (MIN)
BALANCED PROPAGATION DELAYS: t_PLH ≅ t_PHL
OPERATING VOLTAGE RANGE: V_CC (OPR) = 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245
IMPROVED LATCH-UP IMMUNITY


Specifications

Symbol	Parameter	Value	Unit
VCC	Supply Voltage	-0.5 to +7	V
VI	DC Input Voltage	-0.5 to VCC + 0.5	V
VO	DC Output Voltage	-0.5 to VCC + 0.5	V
IIK	DC Input Diode Current	± 20	mA
IOK	DC Output Diode Current	± 20	mA
IO	DC Output Current	± 50	mA
ICC or IGND	DC VCC or Ground Current	± 400	mA
Tstg	Storage Temperature	-65 to +150	°C
TL	Lead Temperature (10 sec)	300	°C

Description

The 74ACT245B is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C²MOS tecnology.

This IC of the 74ACT245B  is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.

The 74ACT245B is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels.

All inputs and outputs of the 74ACT245B 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 REQUIRED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR.