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74ACT245T 반도체 회로 부품 판매점

OCTAL BUS TRANSCEIVER 3-STATE



STMicroelectronics 로고
STMicroelectronics
74ACT245T 데이터시트, 핀배열, 회로
® 74ACT245
OCTAL BUS TRANSCEIVER (3-STATE)
s HIGH SPEED: tPD = 5.5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN) VIL = 0.8V (MAX)
s 50TRANSMISSION LINE OUTPUT DRIVE
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 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
DESCRIPTION
The ACT245 is an advanced CMOS OCTAL BUS
TRANSCEIVER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C2MOS technology. It is ideal for low
power applications mantaining high speed
operation similar to equivalent Bipolar Schottky
TTL.
This IC is intended for two-way asynchronous
communication between data buses and the
PIN CONNECTION AND IEC LOGIC SYMBOLS
B
(Plastic Package)
ORDER CODES :
74ACT245B
74ACT245M
74ACT245T
M
(Micro Package)
T
(TSSOP Package)
direction of data trasmission is determined by
DIR input. The enable input G can be used to
disable the device so that the buses 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 THERMINAL IS FLOATING
(HIGH IMPEDANCE STATE) IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.
May 1999
1/9


74ACT245T 데이터시트, 핀배열, 회로
74ACT245
INPUT AND OUTPUT 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 Enabel 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
V
VI DC Input 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
± 50 mA
ICC orIGND DC VCC or Ground Current
± 400
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
Pa ram et er
VCC Supply Voltage
VI Input Voltage
VO Output Voltage
Top Operating Temperature:
dt/dv Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1)
1) VIN from 0.8 V to 2.0 V
Value
4.5 to 5.5
0 to VCC
0 to VCC
-40 to +85
8
Unit
V
V
V
oC
ns/V
2/9




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74ACT245T transceiver

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