Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74HC245
CMOS IC
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

DIP-20
DESCRIPTION
The U74HC245 is designed for the asynchronous
communication
between
data
buses.
While
the
direction-control(DIR) is high, data transmits from the A bus to
the B bus. Data transmits from the B bus to the A bus if DIR is
low. The output-enable( OE ) will isolate the device from the
buses when high voltage is applied on it.

SOP-20
SSOP-20
FEATURES
TSSOP-20
* Operate from 2V to 6V
* Max tPD is 18ns at 6V

ORDERING INFORMATION
Ordering Number
Lead Free
U74HC245L-D20-T
-

Halogen Free
U74HC245G-D20-T
U74HC245G-S20-R
U74HC245G-R20-R
U74HC245G-P20-R
Package
Packing
DIP-20
SOP-20
SSOP-20
TSSOP-20
Tube
Tape Reel
Tape Reel
Tape Reel
MARKING
DIP-20
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
SOP-20 / SSOP-20 / TSSOP-20
1 of 5
QW-R502-639.E
U74HC245


CMOS IC
PIN CONFIGURATION
DIR
1
20
VCC
A1
2
19
OE
A2
3
18
B1
A3
4
17
B2
A4
5
16
B3
A5
6
15
B4
A6
7
14
B5
A7
8
13
B6
A8
9
12
B7
GND
10
11
B8
FUNCTION TABLE
INPUT
OE
DIR
FUNCTION
X
H
Isolation
L
H
Transmit data from A bus to B bus
L
L
Transmit data from B bus to A bus
Note: H: HIGH voltage level; L: LOW voltage level.

LOGIC DIAGRAM
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QW-R502-639.E
U74HC245

CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.5~7.0
V
Input Clamp Current (ViN<0)
IIK
±20
mA
Output Clamp Current (VOUT<0)
IOK
±20
mA
Output Current
IOUT
±35
mA
VCC or GND Current
ICC
±70
mA
Storage Temperature
TSTG
-65 ~ +150
°C
Note: 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.

THERMAL DATA
PARAMETER
Junction to Ambient

θJA
RATINGS
52
80
96
103
UNIT
°C/W
°C/W
°C/W
°C/W
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Input Voltage
Output Voltage
Input Transition Rise or Fall Rate
Operating Temperature

SYMBOL
DIP-20
SOP-20
SSOP-20
TSSOP-20
SYMBOL
VCC
VIN
VOUT
tR
TEST CONDITIONS
MIN
2
0
0
VCC =2V
VCC =4.5V
VCC =6V
TOPR
-40
TYP MAX UNIT
5
6
V
VCC
V
VCC
V
1000 ns
500
ns
400
ns
85
°C
ELECTRICAL CHARACTERISTICS (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
High-level input voltage
VIH
Low-lever output voltage
VIL
High-Level Output Voltage
VOH
Low-Level Output Voltage
VOL
Input Current of DIR or OE
Output OFF-state current
Quiescent Supply Current
Input Capacitance of DIR or OE
II(LEAK)
IOZ
IQ
CIN
TEST CONDITIONS
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V, IOH=-20μA
VCC=4.5V, IOH=-20μA
VCC=6V, IOH=-20μA
VCC=4.5V, IOH=-6mA
VCC=6V, IOH=-7.8mA
VCC=2V, IOL=20μA
VCC=4.5V, IOL=20μA
VCC=6V, IOL=20μA
VCC=4.5V, IOH=6mA
VCC=6V, IOL=7.8mA
VCC=6V, VIN=VCC or GND
VCC=6V, VOUT=VCC or GND
VCC=6V, VIN=VCC or GND, IOUT=0
VCC=6V, VIN=VCC or GND
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1.5
3.15
4.2
TYP MAX UNIT
V
V
V
0.5
V
1.35
V
1.8
V
1.9 1.998
V
4.4 4.499
V
5.9 5.999
V
3.98 4.3
V
5.48 5.8
V
0.002 0.1
V
0.001 0.1
V
0.001 0.1
V
0.17 0.26
V
0.15 0.26
V
±0.1 ±100 nA
±0.01 ±0.5 μA
8
μA
3
10
pF
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QW-R502-639.E
U74HC245

CMOS IC
SWITCHING CHARACTERISTICS (TA=25°С, CL=50pF, RL=1kΩ, unless otherwise specified)
PARAMETER
SYMBOL
Propagation delay from input
(A or B) to output (B or A)
tPD
(tPLH/tPHL)
3-state output enable time from input
( OE ) to output (A or B)
tEN
(tPZL/tPZH)
3-state output disable time from
input ( OE ) to output (A or B)
tDIS
(tPLZ/tPHZ)
Output transition time, (A or B)
tT
(tR/tF)

TEST CONDITIONS
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V
VCC=4.5V
VCC=6V
MIN
TYP MAX UNIT
40
105
ns
15
21
ns
12
18
ns
125 230
ns
23
46
ns
20
39
ns
74
200
ns
25
40
ns
21
34
ns
20
60
ns
8
12
ns
6
10
ns
TEST CONDITIONS
MIN
TYP MAX UNIT
40
pF
OPERATING CHARACTERISTICS
PARAMETER
Power Dissipation Capacitance
SYMBOL
CPD
No load
UNISONIC TECHNOLOGIES CO., LTD
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QW-R502-639.E
U74HC245

CMOS IC
TEST CIRCUIT AND WAVEFORMS
Note: CL includes probe and jig capacitance.
PRR ≤1MHz, ZO = 50Ω, tR ≤6ns, tF ≤6ns
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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www.unisonic.com.tw
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