74VHC245 STMicroelectronics, 74VHC245 Datasheet

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74VHC245

Manufacturer Part Number
74VHC245
Description
OCTAL BUS TRANSCEIVER 3-STATE
Manufacturer
STMicroelectronics
Datasheet

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DESCRIPTION
The 74VHC245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C
This IC is intended for two-way asynchronous
communication
direction of data trasmission is determined by the
level of the DIR input. The enable input G can be
PIN CONNECTION AND IEC LOGIC SYMBOLS
June 1999
HIGH SPEED: t
LOW POWER DISSIPATION:
I
HIGH NOISE IMMUNITY:
V
POWER DOWN PROTECTION ON CONTROL
INPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
BALANCED PROPAGATION DELAYS:
t
OPERATING VOLTAGE RANGE:
V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
IMPROVED LATCH-UP IMMUNITY
LOW NOISE V
CC
PLH
OH
NIH
CC
= 4 A (MAX.) at T
| = I
(OPR) = 2V to 5.5V
= V
t
PHL
OL
NIL
= 8 mA (MIN)
= 28% V
OLP
PD
between
= 4.0 ns (TYP.) at V
= 0.9V (Max.)
CC
A
(MIN.)
= 25
2
MOS technology.
data
o
C
busses;
CC
= 5V
the
used to disable the device so that the busses 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 TERMINAL IS FLOATING
(HIGH IMPEDANCE STATE) IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL
RESISTOR.
TRANSCEIVER (3-STATE)
(Micro Package)
74VHC245M
M
ORDER CODES :
DOWN
OCTAL BUS
74VHC245
(TSSOP Package)
74VHC245T
PRELIMINARY DATA
OR
T
PULL
UP
1/8

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74VHC245 Summary of contents

Page 1

... PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 IMPROVED LATCH-UP IMMUNITY LOW NOISE V = 0.9V (Max.) OLP DESCRIPTION The 74VHC245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and 2 double-layer metal wiring C MOS technology. This IC is intended for two-way asynchronous ...

Page 2

... INPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUT G DIR X:”H” or ”L” Z: High impedance ABSOLUTE MAXIMUM RATINGS Symbol Parameter V Supply Voltage Input Voltage (DIR Bus I/O Voltage I Output Voltage Input Diode Current Output Diode Current ...

Page 3

... 8.5 L (*) 11.0 L (**) 5.8 L (**) 7.3 L (*) 11.5 L (**) 7.0 L (*) 50 (**) pLHn soHL pHLm pHLn 74VHC245 Value - Max. Min . Max. 1.5 V 0.7V CC 0.5 0.5 V 0.3V 0. 1.9 2.9 V 4.4 2.48 3.8 0.1 0.1 0.1 0.1 V 0.1 0.1 0.36 0.44 0.36 0.44 0.25 2.5 A 0.1 1 Value - Max ...

Page 4

... CAPACITIVE CHARACTERISTICS Symb ol Parameter C Input Capacitance IN C Bus Input Capacitance I/O C Power Dissipation PD Capacitance (note isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto PD Test Circuit).Average operting current can be obtained by the following equation. I ...

Page 5

... WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 74VHC245 5/8 ...

Page 6

... SO-20 MECHANICAL DATA DIM. MIN. TYP 0. 0.35 b1 0. 12.60 E 10.00 e 1.27 e3 11.43 F 7. 6/8 mm MAX. MIN. 2.65 0.20 0.004 2.45 0.49 0.013 0.32 0.009 45 (typ.) 13.00 0.496 10.65 0.393 7.60 0.291 1.27 0.19 0.75 8 (max.) inch TYP. MAX. 0.104 0.007 0.096 0.019 0.012 0.020 0.512 0.419 0.050 0.450 0.299 0.050 0.029 P013L ...

Page 7

... PIN 1 IDENTIFICATION 1 MAX. MIN. 1.1 0.15 0.002 0.95 0.335 0.30 0.0075 0.2 0.0035 6.6 0.252 6.5 0.246 4.48 0.169 0.70 0.020 74VHC245 inch TYP. MAX. 0.433 0.004 0.006 0.354 0.374 0.0118 0.0079 0.256 0.260 0.252 0.256 0.173 0.176 0.0256 BSC 0.024 0.028 L E 7/8 ...

Page 8

... 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. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice ...

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