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74VHCT245A_04 [STMICROELECTRONICS]

OCTAL BUS TRANSCEIVER (3-STATE); 八路总线收发器（三态）
74VHCT245A_04
型号： 74VHCT245A_04
厂家： ST    ST
描述：

OCTAL BUS TRANSCEIVER (3-STATE)
八路总线收发器（三态）

总线收发器
文件： 总13页 (文件大小：303K)
中文：  中文翻译
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74VHCT245A  
OCTAL BUS  
TRANSCEIVER (3-STATE)  
■
■
HIGH SPEED: t = 4.5 ns (TYP.) at V = 5V  
PD CC  
LOW POWER DISSIPATION:  
I
= 4 µA (MAX.) at T =25°C  
CC  
A
■
■
■
■
■
■
COMPATIBLE WITH TTL OUTPUTS:  
= 2V (MIN.), V = 0.8V (MAX)  
POWER DOWN PROTECTION ON INPUTS  
& OUTPUTS  
V
IH  
IL  
SOP  
TSSOP  
T & R  
SYMMETRICAL OUTPUT IMPEDANCE:  
|I | = I = 8 mA (MIN)  
OH  
OL  
Table 1: Order Codes  
PACKAGE  
BALANCED PROPAGATION DELAYS:  
t
t
PLH  
PHL  
OPERATING VOLTAGE RANGE:  
(OPR) = 4.5V to 5.5V  
SOP  
74VHCT245AMTR  
74VHCT245ATTR  
V
CC  
TSSOP  
PIN AND FUNCTION COMPATIBLE WITH  
74 SERIES 245  
■
■
IMPROVED LATCH-UP IMMUNITY  
direction of data transmission is determined by  
DIR input. The enable input G can be used to  
disable the device so that the busses are  
effectively isolated.  
LOW NOISE: V  
= 0.9V (MAX.)  
OLP  
DESCRIPTION  
All inputs and outputs are equipped with  
protection circuits against static discharge, giving  
them 2KV ESD immunity and transient excess  
voltage.  
All floating bus terminals during High Z State must  
be held HIGH or LOW.  
The 74VHCT245A is an advanced high-speed  
CMOS OCTAL BUS TRANSCEIVER (3-STATE)  
fabricated with sub-micron silicon gate and  
double-layer metal wiring C MOS technology.  
This IC is intended for two-way asynchronous  
communication between data busses; the  
2
Figure 1: Pin Connection And IEC Logic Symbols  
Rev. 4  
1/13  
December 2004  
74VHCT245A  
Figure 2: Input/ Output Equivalent Circuit  
Figure 3: Input Equivalent Circuit  
Table 2: Pin Description  
PIN N°  
SYMBOL  
NAME AND FUNCTION  
1
DIR  
Directional Control  
Data Inputs/Outputs  
2, 3, 4, 5, 6,  
7, 8, 9  
A1 to A8  
18, 17, 16,  
15, 14, 13,  
12, 11  
B1 to B8  
Data Inputs/Outputs  
19  
10  
20  
G
Enable Input  
GND  
Ground (0V)  
V
Positive Supply Voltage  
CC  
Table 3: Truth Table  
INPUTS  
FUNCTION  
OUTPUT  
G
DIR  
A BUS  
B BUS  
L
L
L
H
X
OUTPUT  
INPUT  
Z
INPUT  
OUTPUT  
Z
A = B  
B = A  
Z
H
X : Don‘t Care  
Z : High Impedance  
2/13  
74VHCT245A  
Table 4: Absolute Maximum Ratings  
Symbol  
Parameter  
Value  
Unit  
V
Supply Voltage  
-0.5 to +7.0  
-0.5 to +7.0  
-0.5 to +7.0  
V
V
V
CC  
V
DC Input Voltage (DIR, G)  
DC BUS I/O Voltage (see note 1)  
DC BUS I/O Voltage (see note 2)  
DC Input Diode Current  
DC Output Diode Current  
DC Output Current  
I
V
I/O  
V
-0.5 to V + 0.5  
V
I/O  
CC  
I
- 20  
± 20  
mA  
mA  
mA  
mA  
°C  
IK  
I
OK  
I
± 25  
O
I
or I  
DC V or Ground Current  
± 75  
CC  
GND  
CC  
T
Storage Temperature  
-65 to +150  
300  
stg  
T
Lead Temperature (10 sec)  
°C  
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is  
not implied  
1) Output in OFF State  
2) High or Low State. I absolute maximum rating must be observed  
O
Table 5: Recommended Operating Conditions  
Symbol  
Parameter  
Value  
Unit  
V
Supply Voltage  
Input Voltage  
4.5 to 5.5  
0 to 5.5  
0 to 5.5  
V
V
CC  
V
I
V
BUS I/O Voltage (see note 1)  
BUS I/O Voltage (see note 2)  
Operating Temperature  
V
I/O  
V
0 to V  
V
I/O  
CC  
T
-55 to 125  
0 to 20  
°C  
ns/V  
op  
Input Rise and Fall Time (see note 3) (V = 5.0 ± 0.5V)  
dt/dv  
CC  
1) Output in OFF State  
2) High or Low State. I absolute maximum rating must be observed  
O
3) V from 0.8V to 2V  
IN  
3/13  
74VHCT245A  
Table 6: DC Specifications  
Test Condition  
Value  
T = 25°C  
Symbol  
Parameter  
-40 to 85°C -55 to 125°C Unit  
A
V
CC  
(V)  
Min. Typ. Max. Min. Max. Min. Max.  
V
High Level Input  
Voltage  
4.5 to  
5.5  
IH  
2
2
2
V
V
V
Low Level Input  
Voltage  
4.5 to  
5.5  
IL  
0.8  
0.8  
0.8  
V
High Level Output  
Voltage  
I =-50 µA  
4.5  
4.5  
4.5  
4.5  
4.4  
4.5  
0.0  
4.4  
3.8  
4.4  
3.7  
OH  
O
V
V
I =-8 mA  
3.94  
O
V
Low Level Output  
Voltage  
I =50 µA  
0.1  
0.1  
0.1  
OL  
OZ  
O
I =8 mA  
0.36  
0.44  
0.55  
O
I
High Impedance  
Output Leakage  
Current  
V = V or V  
I
IH  
IL  
5.5  
±0.25  
± 2.5  
± 2.5  
µA  
V
= 0V to 5.5V  
O
I
Input Leakage  
Current  
0 to  
5.5  
I
V = 5.5V or GND  
± 0.1  
± 1.0  
± 1.0  
µA  
µA  
I
I
Quiescent Supply  
Current  
CC  
V = V or GND  
5.5  
5.5  
0
4
40  
40  
I
CC  
+I  
Additional Worst  
Case Supply  
Current  
One Input at 3.4V,  
CC  
other input at V  
1.35  
0.5  
1.5  
5.0  
1.5  
5.0  
mA  
CC  
or GND  
I
Output Leakage  
Current  
OPD  
V
= 5.5V  
µA  
OUT  
Table 7: AC Electrical Characteristics (Input t = t = 3ns)  
r
f
Test Condition  
(*)  
Value  
T = 25°C  
Symbol  
Parameter  
-40 to 85°C -55 to 125°C Unit  
Min. Typ. Max. Min. Max. Min. Max.  
A
V
C
L
CC  
(V)  
(pF)  
t
t
Propagation Delay  
Time  
5.0  
5.0  
5.0  
5.0  
15  
50  
15  
50  
4.5  
5.3  
9.0  
9.7  
7.5  
8.7  
1.0  
1.0  
1.0  
1.0  
8.5  
9.5  
1.0  
1.0  
1.0  
1.0  
10.0  
11.0  
16.0  
17.0  
PLH  
PHL  
ns  
ns  
ns  
ns  
t
t
Output Enable  
Time  
13.8  
14.8  
15.0  
16.0  
PZL  
RL = 1KΩ  
RL = 1KΩ  
PZH  
t
t
Output Disable  
Time  
PLZ  
PHZ  
5.0  
5.0  
50  
50  
10.0 15.4  
1.0  
1.0  
16.5  
1.0  
1.0  
17.5  
1.0  
t
t
Output to Output  
Skew Time (note 1)  
OSLH  
OSHL  
(*) Voltage range is 5.0V ± 0.5V  
Note 1: Parameter guaranteed by design. t  
= |t  
- t  
|, t  
= |t  
- t  
|
soLH  
pLHm pLHn soHL  
pHLm pHLn  
4/13  
74VHCT245A  
Table 8: Capacitive Characteristics  
Test Condition  
Value  
-40 to 85°C -55 to 125°C Unit  
Min. Typ. Max. Min. Max. Min. Max.  
T = 25°C  
Symbol  
Parameter  
A
C
Input Capacitance  
6
8
10  
10  
10  
pF  
pF  
IN  
Bus Input  
Capacitance  
C
I/O  
C
Power Dissipation  
Capacitance  
(note 1)  
PD  
18  
pF  
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without  
PD  
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I  
Table 4: DYNAMIC SWITCHING CHARACTERISTICS  
Test Condition  
= C x V x f + I /8 (per circuit)  
CC(opr)  
PD CC IN CC  
Value  
T = 25°C  
Symbol  
Parameter  
-40 to 85°C -55 to 125°C Unit  
Min. Typ. Max. Min. Max. Min. Max.  
A
V
(V)  
CC  
V
Dynamic Low  
0.6  
0.9  
OLP  
Voltage Quiet  
Output (note 1, 2)  
5.0  
V
-0.9  
2.0  
-0.6  
OLV  
Dynamic High  
Voltage Input  
(note 1, 3)  
V
C = 50 pF  
L
5.0  
5.0  
V
IHD  
Dynamic Low  
Voltage Input  
(note 1, 3)  
V
0.8  
ILD  
1) Worst case package.  
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n-1) outputs switching and one output at GND.  
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.0V. Inputs under test switching: 3.0V to threshold (V ), 0V to threshold  
ILD  
(V ), f=1MHz.  
IHD  
5/13  
74VHCT245A  
Figure 5: Test Circuit  
TEST  
SWITCH  
t
t
t
, t  
Open  
PLH PHL  
, t  
V
CC  
PZL PLZ  
, t  
GND  
PZH PHZ  
C
R
R
=15/ 50pF or equivalent (includes jig and probe capacitance)  
L
L
T
= R = 1KΩ or equivalent  
1
= Z  
of pulse generator (typically 50Ω)  
OUT  
Figure 6: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)  
6/13  
74VHCT245A  
Figure 7: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)  
7/13  
74VHCT245A  
SO-20 MECHANICAL DATA  
mm.  
inch  
TYP.  
DIM.  
MIN.  
TYP  
MAX.  
MIN.  
MAX.  
A
A1  
B
2.35  
2.65  
0.093  
0.104  
0.1  
0.33  
0.23  
12.60  
7.4  
0.30  
0.51  
0.32  
13.00  
7.6  
0.004  
0.013  
0.009  
0.496  
0.291  
0.012  
0.020  
0.013  
0.512  
0.299  
C
D
E
e
1.27  
0.050  
H
10.00  
0.25  
0.4  
10.65  
0.75  
1.27  
8°  
0.394  
0.010  
0.016  
0°  
0.419  
0.030  
0.050  
8°  
h
L
k
0°  
ddd  
0.100  
0.004  
0016022D  
8/13  
74VHCT245A  
TSSOP20 MECHANICAL DATA  
mm.  
inch  
TYP.  
DIM.  
MIN.  
TYP  
MAX.  
1.2  
MIN.  
MAX.  
0.047  
0.006  
0.041  
0.012  
0.0079  
0.260  
0.260  
0.176  
A
A1  
A2  
b
0.05  
0.8  
0.15  
1.05  
0.30  
0.20  
6.6  
0.002  
0.031  
0.007  
0.004  
0.252  
0.244  
0.169  
0.004  
0.039  
1
0.19  
0.09  
6.4  
c
D
6.5  
6.4  
0.256  
0.252  
E
6.2  
6.6  
E1  
e
4.3  
4.4  
4.48  
0.173  
0.65 BSC  
0.0256 BSC  
K
0˚  
8˚  
0˚  
8˚  
L
0.45  
0.60  
0.75  
0.018  
0.024  
0.030  
A2  
A
K
L
b
e
A1  
E
c
D
E1  
PIN 1 IDENTIFICATION  
1
0087225C  
9/13  
74VHCT245A  
Tape & Reel SO-20 MECHANICAL DATA  
mm.  
TYP  
inch  
TYP.  
DIM.  
MIN.  
MAX.  
330  
MIN.  
MAX.  
12.992  
0.519  
A
C
12.8  
20.2  
60  
13.2  
0.504  
0.795  
2.362  
D
N
T
30.4  
11  
1.197  
0.433  
0.528  
0.130  
0.161  
0.476  
Ao  
Bo  
Ko  
Po  
P
10.8  
13.2  
3.1  
0.425  
0.520  
0.122  
0.153  
0.468  
13.4  
3.3  
3.9  
4.1  
11.9  
12.1  
10/13  
74VHCT245A  
Tape & Reel TSSOP20 MECHANICAL DATA  
mm.  
TYP  
inch  
TYP.  
DIM.  
MIN.  
MAX.  
330  
MIN.  
MAX.  
12.992  
0.519  
A
C
12.8  
20.2  
60  
13.2  
0.504  
0.795  
2.362  
D
N
T
22.4  
7
0.882  
0.276  
0.280  
0.075  
0.161  
0.476  
Ao  
Bo  
Ko  
Po  
P
6.8  
6.9  
0.268  
0.272  
0.067  
0.153  
0.468  
7.1  
1.9  
4.1  
12.1  
1.7  
3.9  
11.9  
11/13  
74VHCT245A  
Table 9: Revision History  
Date  
Revision  
Description of Changes  
Order Codes Revision - pag. 1.  
16-Dec-2004  
4
12/13  
74VHCT245A  
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences  
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted  
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject  
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not  
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.  
The ST logo is a registered trademark of STMicroelectronics  
All other names are the property of their respective owners  
© 2004 STMicroelectronics - All Rights Reserved  
STMicroelectronics group of companies  
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Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America  
www.st.com  
13/13  

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