U74AHC245 [UTC]
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS;
| 型号： | U74AHC245 |
| 厂家： | 
Unisonic Technologies |
| 描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS 输出元件 |
| 文件： | 总5页 (文件大小：211K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
U74AHC245
CMOS IC
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
DESCRIPTION
The U74AHC245 octal bus transceivers is designed for
asynchronous two-way communication between data buses. The
control-function implementation minimizes external timing
requirements.
The device allows data transmission from the A bus to the B
bus or from the B bus to the A bus, depending on the logic level at
the direction-control (DIR) input. The output-enable ( OE ) input can
be used to disable the device so that the buses are effectively
isolated.
To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pullup resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
FEATURES
* Operating range 2V to 5.5V VCC
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
U74AHC245L-R20-T
U74AHC245L-R20-R
U74AHC245G-R20-T
U74AHC245G-R20-R
SSOP-20
SSOP-20
Tube
Tape Reel
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Copyright © 2013 Unisonic Technologies Co., Ltd
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U74AHC245
CMOS IC
PIN CONFIGURATION
FUNCTION TABLE
INPUT
FUNCTION
DIR
OE
H
X
H
L
Isolation
L
Transmit data from A bus to B bus
Transmit data from B bus to A bus
L
Note: H: HIGH voltage level; L: LOW voltage level; X:Don’t care
LOGIC DIAGRAM
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VCC
VI
RATINGS
-0.5~7.0
-0.5~7.0
-0.5~VCC+0.5
-20
UNIT
V
Supply Voltage
Input Voltage Range
V
Output Voltage Range
Input Clamp Current (ViN<0)
Output Clamp Current (VO<0 or VO>VCC
Output Current
VO
V
IIK
mA
mA
mA
mA
°C
)
IOK
±20
IOUT
ICC
±25
VCC or GND Current
±75
Storage Temperature
TSTG
-65 ~ +150
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are
observed.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
VCC
MIN
2
TYP
MAX
5.5
5.5
VCC
85
UNIT
V
Supply Voltage
Input Voltage
Output Voltage
VIN
0
V
VOUT
TOPR
0
V
Operating Temperature
-40
°C
V
CC =3.3V±0.3V
100
20
Input Transition Rise or Fall Rate
Operating Free-air Temperature
∆t/∆v
ns/V
°C
VCC =5V±0.5V
TA
-40
85
ELECTRICAL CHARACTERISTICS (Ta=25°С, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
1.5
VCC=2V
VCC=3V
HIGH-level input voltage
LOW-lever output voltage
VIH
2.1
V
VCC=5.5V
3.85
VCC=2V
0.5
0.9
VIL
VCC=3V
V
VCC=5.5V
1.65
VCC=2V, IOH=-50μA
VCC=3V, IOH=-50μA
VCC=4.5V, IOH=-50μA
VCC=3V, IOH=-4mA
VCC=4.5V, IOH=-8mA
VCC=2V, IOL=50μA
VCC=3V, IOL=50μA
VCC=4.5V, IOL=50μA
VCC=3V, IOL=4mA
VCC=4.5V, IOL=8mA
VCC=5.5V, VIN=VCC or GND
1.9
2.9
2
3
High-Level Output Voltage
Low-Level Output Voltage
VOH
4.4
4.5
V
2.58
3.94
0.1
0.1
0.1
VOL
V
0.36
0.36
A or B inputs
Input Leakage Current
II(LEAK)
±0.1
μA
VCC=0 to 5.5V, VIN=VCC or GND
OE or DIR
Output OFF-state current
Quiescent Supply Current
IOZ
IQ
VCC=5.5V, VOUT=VCC or GND
±0.25 μA
VCC=5.5V, VIN=VCC or GND, IOUT=0
4
μA
pF
pF
CI
VCC=5V, VIN=VCC or GND
VCC=5V, VIN=VCC or GND
2.5
4
10
Input Capacitance( OE or DIR)
Input Capacitance(A or B inputs)
CIO
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U74AHC245
CMOS IC
SWITCHING CHARACTERISTICS (TA=25°С, RL=1kΩ,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
MIN TYP MAX UNIT
5.8 8.4
8.3 11.9
Propagation delay from input
(A or B) to output (B or A)
tpd
ns
ns
ns
(tPLH/tPHL
)
)
)
4
5.5
7.5
5.5
8.5 13.2
11 16.7
3-state output enable time from input
( OE ) to output (A or B)
ten
(tPZL/tPZH
5.8
8.5
7.3 10.6
8.9 12.5
11.5 15.8
3-state output disable time from
input ( OE ) to output (A or B)
tdis
(tPLZ/tPHZ
5.6
7
7.8
9.7
OPERATING CHARACTERISTICS(VCC=5V, TA=25°С)
PARAMETER
Power Dissipation Capacitance
SYMBOL
CPD
TEST CONDITIONS
No load, f=1MHz
MIN TYP MAX UNIT
14
pF
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U74AHC245
CMOS IC
TEST CIRCUIT AND WAVEFORMS
VCC
K1
From Output
RL
CL
(Note 1)
K2
Notes: 1. CL includes probe and jig capacitance.
2. All input pulses are supplied by generators having the following characteristics:
PRR≤1MHZ, ZO=50Ω, tr ≤ 3ns, tf ≤ 3ns.
3. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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UTC
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