74ACT245T STMICROELECTRONICS [STMicroelectronics], 74ACT245T Datasheet

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74ACT245T

Manufacturer Part Number
74ACT245T
Description
OCTAL BUS TRANSCEIVER 3-STATE
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
DESCRIPTION
The 74ACT245 is an advanced high-speed CMOS
OCTAL
fabricated with sub-micron silicon gate and
double-layer metal wiring C
This IC 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
HIGH SPEED: t
LOW POWER DISSIPATION:
I
COMPATIBLE WITH TTL OUTPUTS
V
50 TRANSMISSION LINE DRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I
BALANCED PROPAGATION DELAYS:
t
OPERATING VOLTAGE RANGE:
V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
IMPROVED LATCH-UP IMMUNITY
CC
PLH
OH
IH
CC
= 4 A(MAX.) at T
= 2V (MIN.), V
| = I
(OPR) = 4.5V to 5.5V
t
PHL
OL
BUS
= 24mA (MIN)
PD
TRANSCEIVER
IL
= 5.4ns (TYP.) at V
= 0.8V (MAX.)
A
=25°C
2
MOS tecnology.
WITH 3 STATE OUTPUTS (NON INVERTED)
(3-STATE)
CC
= 5V
ORDER CODES
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
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 REQUIRED TO FIX
THE INPUT LEVEL BY MEANS OF EXTERNAL
PULL DOWN OR PULL UP RESISTOR.
OCTAL BUS TRANSCEIVER
PACKAGE
TSSOP
SOP
DIP
DIP
74ACT245M
74ACT245B
TUBE
SOP
74ACT245
74ACT245MTR
74ACT245TTR
TSSOP
T & R
1/9

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74ACT245T Summary of contents

Page 1

... ESD immunity and transient excess voltage PROHIBITED TO APPLY A SIGNAL TO A TERMINAL WHEN OUTPUT MODE AND WHEN A BUS THERMINAL IS FLOATING (HIGH IMPEDANCE STATE REQUIRED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR. 74ACT245 SOP TSSOP TUBE T & R 74ACT245B 74ACT245M 74ACT245MTR 74ACT245TTR 1/9 ...

Page 2

INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUTS G DIR Don’t Care Z : High Impedance ABSOLUTE MAXIMUM RATINGS Symbol V Supply Voltage Input Voltage Output Voltage O ...

Page 3

DC SPECIFICATIONS Symbol Parameter V V High Level Input IH Voltage V Low Level Input IL Voltage V High Level Output OH Voltage V Low Level Output OL Voltage I Input Leakage Cur- I rent I High Impedance OZ Output ...

Page 4

CAPACITIVE CHARACTERISTICS Symbol Parameter V C Input Capacitance IN C I/O Capacitance I/O C Power Dissipation PD Capacitance (note defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating ...

Page 5

WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 74ACT245 5/9 ...

Page 6

Plastic DIP-20 (0.25) MECHANICAL DATA DIM. MIN. a1 0.254 B 1. 6/9 mm TYP. MAX. MIN. 0.010 1.65 0.055 0.45 0.25 25.4 8.5 2.54 22.86 7.1 3.93 3.3 1.34 ...

Page 7

SO-20 MECHANICAL DATA mm DIM. MIN. TYP 0. 0.35 b1 0. 12.60 E 10.00 e 1.27 e3 11.43 F 7. inch MAX. MIN. TYP. 2.65 0.20 0.004 2.45 ...

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DIM. MIN 0.05 A2 0.85 b 0.19 c 0.09 D 6.4 E 6. PIN 1 IDENTIFICATION 1 8/9 TSSOP20 MECHANICAL DATA mm TYP. MAX. 1.1 ...

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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. ...

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