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74VHCT245A PDF даташит

Спецификация 74VHCT245A изготовлена ​​​​«STMicroelectronics» и имеет функцию, называемую «OCTAL BUS TRANSCEIVER 3-STATE».

Детали детали

Номер произв 74VHCT245A
Описание OCTAL BUS TRANSCEIVER 3-STATE
Производители STMicroelectronics
логотип STMicroelectronics логотип 

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74VHCT245A Даташит, Описание, Даташиты
®
s HIGH SPEED: tPD = 4.5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS:
VIH = 2V (MIN), VIL = 0.8V (MAX)
s POWER DOWN PROTECTION ON INPUTS &
OUTPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 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
s LOW NOISE: VOLP = 0.9V (Max.)
DESCRIPTION
The 74VHCT245A is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
This IC is intended for two-way asynchronous
communication between data busses; the
direction of data trasmission is determined by the
74VHCT245A
OCTAL BUS
TRANSCEIVER (3-STATE)
PRELIMINARY DATA
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHCT245AM 74VHCT245AT
level of the DIR input. The enable input G can be
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 DOWN OR PULL UP
RESISTOR.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 1999
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74VHCT245A Даташит, Описание, Даташиты
74VHCT245A
INPUT/OUTPUT EQUIVALENT CIRCUIT
INPUT EQUIVALENT CIRCUIT
TRUTH TABLE
G
L
L
H
X:”H” or ”L”
Z: High impedance
INPUT
DIR
L
H
X
PIN DESCRIPTION
PIN No
1
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
S YM BO L
DIR
A1 to A8
NAME AND FUNCTION
Directional Control
Data Inputs/Outputs
B1 to B8 Data Inputs/Outputs
G
GND
VCC
Output Enable Input
Ground (0V)
Positive Supply Voltage
F UN CTI ON
A BUS
B BUS
OUTPUT
INPUT
INPUT
OUTPUT
ZZ
OUT PUT
A=B
B=A
Z
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74VHCT245A Даташит, Описание, Даташиты
74VHCT245A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7.0
V
VI DC Input Voltage (DIR, G)
-0.5 to +7.0
V
VI/O DC Bus I/O Voltage (see note 1)
-0.5 to +7.0
V
VI/O DC Bus I/O Voltage (see note 2)
-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
± 25 mA
ICC or IGND DC VCC or Ground Current
± 75 mA
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
1) Output in OffState
2) High or Low State. IO absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage (DIR, G)
VI/O Bus I/O Voltage (see note 1)
VI/O Bus I/O Voltage (see note 2)
Top Operating Temperature
dt/dv Input Rise and Fall Time (see note 3) (VCC = 5.0 ± 0.5V)
1) Output in OffState
2) High or Low State. IO absolute maximum rating must be observed.
3) VIN from 0.8 to 2V
Valu e
4.5 to 5.5
0 to 5.5
0 to 5.5
0 to VCC
-40 to +85
0 to 20
Unit
V
V
V
V
oC
ns/V
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