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74VHCT244A PDF даташит

Спецификация 74VHCT244A изготовлена ​​​​«STMicroelectronics» и имеет функцию, называемую «OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED».

Детали детали

Номер произв 74VHCT244A
Описание OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED
Производители STMicroelectronics
логотип STMicroelectronics логотип 

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74VHCT244A Даташит, Описание, Даташиты
® 74VHCT244A
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
s HIGH SPEED: tPD = 3.9 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 244
s IMPROVED LATCH-UP IMMUNITY
s LOW NOISE VOLP = 0.9V (Max.)
DESCRIPTION
The 74VHCT244A is an advanced high speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
G output enable governs four BUS BUFFERs.
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHCT244AM 74VHCT244AT
This device is designed to be used with 3 state
memory address drivers, etc.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 1999
1/8









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74VHCT244A Даташит, Описание, Даташиты
74VCHT244A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCT ION
1 1G Output Enable Input
2, 4,6, 8 1A1 to 1A4 Data Inputs
9, 7,5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15, 17 2A1 to 2A4 Data Inputs
18, 16, 14, 12 1Y1 to 1Y4 Data Outputs
19 2G Output Enable Input
10 GND Ground (0V)
20 VCC Positive Supply Voltage
TRUTH TABLE
X:”H” or ”L”
Z: High impedance
G
L
L
H
INPUT
An
L
H
X
OUTPUT
Yn
L
H
Z
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7.0
V
VI DC Input Voltage
-0.5 to +7.0
V
VO DC Output Voltage (see note 1)
-0.5 to +7.0
V
VO DC Output 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 orIGND DC VCC or Ground Current
± 50 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 OFF State
2) High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage
VO Output Voltage (see note 1)
VO Output 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 OFF State
2) High or Low State
3)VIN from0.8V to 2 V
2/8
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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74VHCT244A Даташит, Описание, Даташиты
74VHCT244A
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
ICC Additional Worst Case
Supply Current
IOPD Output Leakage
Current
Test Conditions
V CC
( V)
4.5 to 5.5
4.5 to 5.5
4.5
4.5
4.5
4.5
4.5 to 5.5
IO=-50 µA
IO=-8 mA
IO=50 µA
IO=8 mA
VI = VIH orVIL
VO = 0V to 5.5V
0 to 5.5
5.5
VI = 5.5V or GND
VI = VCC orGND
5.5 One Input at 3.4V,
other input at VCC or
GND
0 VOUT = 5.5V
Value
TA = 25 oC
Min. Typ. Max.
2
-40 to 85 oC
Min . Max.
2
0.8 0.8
4.4 4.5
4.4
3.94 3.8
0.0 0.1
0.1
0.36 0.44
±0.25
±2.5
±0.1 ±1.0
2 20
1.35 1.5
0.5 5.0
Un it
V
V
V
V
µA
µA
µA
mA
µA
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symb ol
Parameter
tPLH Propagation Delay
tPHL Time
tPLZ Output Disable Time
tPHZ
tPZL Output Enable Time
tPZH
(*) Voltage range is 5.0V ± 0.5V
Test Condition
V CC
( V)
CL
(pF)
5.0(*)
5.0(*)
15
50
5.0(*)
5.0(*)
5.0(*)
15 RL = 1K
50
50 RL = 1K
Value
TA = 25 oC
Min. Typ. Max.
5.4 7.4
5.9 8.4
7.7 10.4
8.2 11.4
8.8 11.4
-40 to 85 oC
Min . Max.
1.0 8.5
1.0 9.5
1.0 12.0
1.0 13.0
1.0 13.0
Unit
ns
ns
ns
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