74VHC245M PDF даташит
Спецификация 74VHC245M изготовлена «STMicroelectronics» и имеет функцию, называемую «OCTAL BUS TRANSCEIVER 3-STATE». |
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Детали детали
Номер произв | 74VHC245M |
Описание | OCTAL BUS TRANSCEIVER 3-STATE |
Производители | STMicroelectronics |
логотип |
8 Pages
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®
s HIGH SPEED: tPD = 4.0 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON CONTROL
INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V 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 74VHC245 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
level of the DIR input. The enable input G can be
PIN CONNECTION AND IEC LOGIC SYMBOLS
74VHC245
OCTAL BUS
TRANSCEIVER (3-STATE)
PRELIMINARY DATA
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC245M
74VHC245T
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.
June 1999
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74VHC245
INPUT EQUIVALENT CIRCUIT
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
TRUTH TABLE
G
L
L
H
X:”H” or ”L”
Z: High impedance
INPUT
DIR
L
H
X
F UN CTI ON
A BUS
B BUS
OUTPUT
INPUT
INPUT
OUTPUT
ZZ
OUT PUT
A=B
B=A
Z
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 Bus I/O 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
± 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.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage (DIR, G)
VI/O Bus I/O Voltage
VO Output Voltage
Top Operating Temperature
dt/dv Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V)
(V CC = 5.0 ± 0.5V)
1) VIN from 30% to70%of VCC
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Valu e
2.0 to 5.5
0 to 5.5
0 to VCC
0 to VCC
-40 to +85
0 to 100
0 to 20
Unit
V
V
V
V
oC
ns/V
ns/V
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74VHC245
DC SPECIFICATIONS
Symb ol
Parameter
VIH High Level Input
Voltage
VIL Low Level Input
Voltage
VOH High Level Output
Voltage
VOL Low Level Output
Voltage
IOZ High Impedance
Output Leakage
Current
II Input Leakage Current
ICC Quiescent Supply
Current
Test Conditions
V CC
( V)
2 .0
3.0 to 5.5
2.0
3.0 to 5.5
2.0
3.0
4.5
3.0
4.5
2.0
3.0
4 .5
3.0
4.5
5 .5
IO=-50 µA
IO=-50 µA
IO=-50 µA
IO=-4 mA
IO=-8 mA
IO=50 µA
IO=50 µA
IO=50 µA
IO=4 mA
IO=8 mA
VI = VIH or VIL
VO = VCC or GND
0 to 5.5
5.5
VI = 5.5V or GND
VI = VCC or GND
Value
TA = 25 oC
-40 to 85 oC
Min. Typ . Max. Min . Max.
1.5 1.5
0.7VCC
0.7VCC
0.5 0.5
0.3VCC
0.3VCC
1.9 2.0
1.9
2.9 3.0
2.9
4.4 4.5
4.4
2.58 2.48
3.94 3.8
0.0 0.1
0.1
0.0 0.1
0.1
0.0 0.1
0.1
0.36 0.44
0.36 0.44
±0.25
±2.5
±0.1
4
±1.0
40
Un it
V
V
V
V
µA
µA
µA
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symb ol
Parameter
Test Condition
V CC
( V)
CL
(pF)
tPLH Propagation Delay
tPHL Time
3.3(*)
3.3(*)
15
50
5.0(**)
15
5.0(**)
50
tPLZ Output Disable Time
tPHZ
3.3(*)
3.3(*)
5.0(**)
15 RL = 1KΩ
50 RL = 1KΩ
15 RL = 1KΩ
tPZL Output Enable Time
5.0(**)
3.3(*)
50 RL = 1KΩ
50 RL = 1KΩ
tPZH
tOSLH Output to Output Skew
5.0(**)
3.3(*)
50 RL = 1KΩ
50
tOSHL Time (note 1)
5.0(**)
50
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5V ± 0.5V
Note 1: Parameter guaranteed by design. tsoLH = |tpLHm- tpLHn|, tsoHL = |tpHLm - tpHLn|
Value
TA = 25 oC
Min. Typ. Max.
5.8 8.4
8.3 11.9
4.0 5.5
5.5 7.5
8.5 13.2
11.0 16.7
5.8 8.5
7.3 10.6
11.5 15.8
7.0 9.7
1.5
1.0
-40 to 85 oC
Min . Max.
1.0 10.0
1.0 13.5
1.0 6.5
1.0 8.5
1.0 15.5
1.0 19.0
1.0 10.0
1.0 12.0
1.0 18.0
1.0 11.0
1.5
1.0
Unit
ns
ns
ns
ns
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