m74hct245 STMicroelectronics, m74hct245 Datasheet

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m74hct245

Manufacturer Part Number
m74hct245
Description
Octal Bus Transceiver3-state Hct245 Non Inverting Hct640 Inverting, Hct643 Inverting/non Inverting
Manufacturer
STMicroelectronics
Datasheet

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DESCRIPTION
The M74HCT245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with silicon gate 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
August 2001
HIGH SPEED:
t
LOW POWER DISSIPATION:
I
COMPATIBLE WITH TTL OUTPUTS :
V
SYMMETRICAL OUTPUT IMPEDANCE:
|I
BALANCED PROPAGATION DELAYS:
t
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
PD
CC
PLH
OH
IH
= 13ns (TYP.) at V
= 4 A(MAX.) at T
= 2V (MIN.) V
| = I
t
PHL
OL
= 6mA (MIN)
IL
= 0.8V (MAX)
A
CC
=25°C
= 4.5V
2
WITH 3 STATE OUTPUTS (NON INVERTED)
MOS technology.
ORDER CODES
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
PACKAGE
OCTAL BUS TRANSCEIVER
TSSOP
SOP
DIP
DIP
M74HCT245M1R M74HCT245RM13TR
M74HCT245B1R
TUBE
M74HCT245
SOP
M74HCT245TTR
T & R
TSSOP
1/9

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m74hct245 Summary of contents

Page 1

... PLH PHL PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 DESCRIPTION The M74HCT245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) 2 fabricated with silicon gate C MOS technology. This IC is intended for two-way asynchronous communication between data buses, and the direction of data transmission is determined by DIR input ...

Page 2

... M74HCT245 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 Input Diode Current Output Diode Current Output Current ...

Page 3

... Input 6ns Test Condition T = 25° (pF) Min. Typ 150 150 M74HCT245 Value -40 to 85°C -55 to 125° C Unit Max. Min. Max. Min. Max. 2.0 2.0 0.8 0.8 0.8 4.4 4.4 4.13 4.10 0.1 0.1 0.1 0.26 0.33 0. 2.0 2.9 3 ...

Page 4

... M74HCT245 CAPACITIVE CHARACTERISTICS Symbol Parameter V CC (V) C Input Capacitance IN Output C I/OUT Capacitance C Power Dissipation PD Capacitance (note defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without PD load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I ...

Page 5

... WAVEFORM 1 : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle) WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) M74HCT245 5/9 ...

Page 6

... M74HCT245 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 inch TYP. MAX. 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053 P001J ...

Page 7

... DIM. MIN. TYP 0.35 b1 0. 12.60 E 10.00 e 1.27 e3 11.43 F 7. inch MAX. MIN. TYP. 2.65 0.2 0.004 2.45 0.49 0.014 0.32 0.009 0.020 45° ( typ.) 13.00 0.496 10.65 0.393 0.050 0.450 7.60 0.291 1.27 0.020 0.75 8° (max.) M74HCT245 MAX. 0.104 0.008 0.096 0.019 0.012 0.512 0.419 0.300 0.050 0.029 PO13L 7/9 ...

Page 8

... M74HCT245 TSSOP20 MECHANICAL DATA DIM. MIN 0.05 A2 0.8 b 0.19 c 0.09 D 6.4 E 6 0° PIN 1 IDENTIFICATION 1 8/9 mm. TYP MAX. MIN. 1.2 0.15 0.002 1 1.05 0.031 0.30 0.007 0.20 0.004 6.5 6.6 0.252 6.4 6.6 0.244 4.4 4.48 0.169 0.65 BSC 8° 0.60 0.75 0.018 inch TYP. MAX. 0.047 0.004 0.006 0.039 0.041 0.012 0.0089 ...

Page 9

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