74VHCT245N [FAIRCHILD]
Bus Transceiver, AHCT/VHCT Series, 1-Func, 8-Bit, True Output, CMOS, PDIP20, PLASTIC, DIP-20;
| 型号： | 74VHCT245N |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Bus Transceiver, AHCT/VHCT Series, 1-Func, 8-Bit, True Output, CMOS, PDIP20, PLASTIC, DIP-20 光电二极管 逻辑集成电路 |
| 文件： | 总10页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 1998
74VHC245 • 74VHCT245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
Features
n High Speed:
The VHC/VHCT245 is an advanced high speed CMOS octal
bus transceiver fabricated with silicon gate CMOS technol-
ogy. It achieves high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation. The VHC245 is intended for bidirectional asyn-
chronous communication between data busses. The direc-
tion of data transmission is determined by the level of the
T/R input. The enable input can be used to disable the de-
vice so that the busses are effectively isolated. All inputs are
equipped with protection circuits against static discharge.
=
=
=
=
VHC tpd 4.0 ns (typ) at VCC 5V
VHCT tpd 5.3 ns (typ) at VCC 5V
n High Noise Immunity:
=
=
VHC VNIH VNIL 28% VCC (Min)
=
=
VHCT VIH 2.0V, VIL 0.8V
n Power Down Protection:
VHC Inputs Only
VHCT Inputs and Outputs
n Low Noise:
=
VHC VOLP 0.9V (typ)
=
VHCT VOLP 1.1V (typ)
n Low Power Dissipation:
=
=
@
ICC 4 µA (Max) TA 25˚C
n Pin and Function Compatible with 74HC/HCT245
Ordering Code:
Commercial
74VHC245M
Package Number
M20B
Package Description
20 Lead Molded JEDEC SOIC
20 Lead Molded EIAJ SOIC
20 Lead Molded JEDEC Type 1 TSSOP
20 Lead Molded DIP
74VHC245SJ
74VHC245MTC
74VHC245N
M20D
MTC20
N20A
74VHCT245M
74VHCT245SJ
74VHCT245MTC
74VHCT245N
M20B
20 Lead Molded JEDEC SOIC
20 Lead Molded EIAJ SOIC
20 Lead Molded JEDEC Type 1 TSSOP
20 Lead Molded DIP
M20D
MTC20
N20A
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
IEEE/IEC
Pin Assignment for DIP,
TSSOP and SOIC
DS011520-2
DS011520-3
© 1998 Fairchild Semiconductor Corporation
DS011520
www.fairchildsemi.com
Pin Description
Truth Tables
Pin
Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
B0–B7
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Inputs
Outputs
OE
T/R
L
L
L
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
H
H
X
=
=
=
Immaterial
H
L
HIGH Voltage Level
LOW Voltage Level
X
Any unused bus terminals during HIGH-Z State must be held HIGH or LOW.
www.fairchildsemi.com
2
Absolute Maximum Ratings (Note 2)
Recommended Operating
Conditions (Note 3)
Supply Voltage (VCC
)
−0.5V to +7.0V
−0.5V to 7.0V
DC Input Voltage (VIN) (T/R , OE )
Supply Voltage (VCC
)
DC Output Voltage (VOUT
VHC
)
VHC
2.0V to 5.5V
4.5V to 5.5V
0V to 5.5V
−0.5V to VCC + 0.5V
−0.5V to 7.0V
−20 mA
VHCT (Note 1)
VHCT (Note 1)
Input Voltage (VIN)(T/R, OE )
Output Voltage (VOUT
Operating Temperature (TOPR
Input Rise and Fall Time (tr, tf)
Input Diode Current (IIK) (T/R , OE )
)
0V to VCC
Output Diode Current (IOK
)
)
−40˚C to +85˚C
±
VHC
20 mA
VHCT
−20 mA
=
±
±
z
100 ns/V
VCC 3.3V 0.3V (VHC only)
0
±
±
DC Output Current (IOUT
)
25 mA
75 mA
=
z
20 ns/V
VCC 5.0V 0.5V
0
DC VCC/GND Current (ICC
)
>
Note 1:
V
OUT
V
CC
only if output is in H or Z state.
Storage Temperature (TSTG
Lead Temperature (TL)
(Soldering, 10 seconds)
)
−65˚C to +150˚C
Note 2: Absolute Maximum Ratings are values beyond which the device
may be damaged or have its useful life impaired. The databook specifications
should be met, without exception, to ensure that the system design is reliable
over its power supply, temperature, and output/input loading variables. Fair-
child does not recommend operation outside databook specifications.
260˚C
Note 3: Unused inputs or I/O pins must be held HIGH or LOW. They may not
float.
DC Characteristics for VHC Family Devices
=
=
Symbol
Parameter
VCC
TA 25˚C
TA −40˚C
Units
Conditions
(V)
to +85˚C
Min
1.50
Typ
Max
Min
Max
VIH
VIL
High Level Input
Voltage
2.0
3.0–5.5
2.0
1.50
V
V
0.7 VCC
0.7 VCC
Low Level Input
Voltage
0.50
0.50
3.0–5.5
2.0
0.3 VCC
0.3 VCC
=
=
IOH −50 µA
VOH
VOL
IOZ
High Level Output
Voltage
1.9
2.9
2.0
3.0
4.5
1.9
2.9
VIN VIH
3.0
V
V
or VIL
4.5
4.4
4.4
=
IOH −4 mA
3.0
2.58
3.94
2.48
3.80
=
IOH −8 mA
4.5
=
=
IOL 50 µA
Low Level Output
Voltage
2.0
0.0
0.0
0.0
0.1
0.1
0.1
0.1
VIN VIH
3.0
V
V
or VIL
4.5
0.1
0.1
=
IOL 4 mA
3.0
0.36
0.36
0.44
0.44
=
IOL 8 mA
4.5
=
3-STATE Output
Off-State Current
VIN VCC or GND
=
±
±
±
5.5
0–5.5
5.5
0.25
2.5
1.0
µA
µA
µA
VOUT VCC or GND
=
VIN OE VIH or VIL
=
±
IIN
Input Leakage
Current
0.1
VIN 5.5V or GND
(T/R, OE )
ICC
=
VIN VCC or GND
Quiescent Supply
Current
4.0
40.0
3
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DC Characteristics for VHC Family Devices
=
Symbol
Parameter
VCC
(V)
TA 25˚C
Units
Conditions
Typ
Limits
=
CL 50 pF
VOLP (Note 4)
VOLV (Note 4)
VIHD (Note 4)
VILD (Note 4)
Quiet Output Maximum
Dynamic VOL
5.0
5.0
5.0
5.0
0.9
1.2
V
V
V
V
=
CL 50 pF
Quiet Output Minimum
Dynamic VOL
−0.9
−1.2
3.5
=
CL 50 pF
Minimum High Level
Dynamic Input Voltage
Maximum Low Level
Dynamic Input Voltage
=
CL 50 pF
1.5
Note 4: Parameter guaranteed by design.
DC Characteristics for VHCT Family Devices
=
=
Symbol
Parameter
VCC
TA 25˚C
TA −40˚C
Units
Conditions
(V)
to +85˚C
Min
2.0
2.0
Typ
Max
Min
Max
VIH
VIL
High Level
4.5
5.5
4.5
5.5
4.5
4.5
4.5
4.5
2.0
2.0
V
V
Input Voltage
Low Level
0.8
0.8
0.8
0.8
Input Voltage
High Level
=
=
IOH −50 µA
VOH
VOL
IOZ
3.15
2.5
3.65
0.0
3.15
2.4
V
V
V
V
VIN VIH
=
IOH −8 mA
Output Voltage
Low Level
or VIL
=
=
IOL 50 µA
0.1
0.1
VIN VIH
=
IOL 8 mA
Output Voltage
3-STATE Output
Off-State Current
0.36
0.44
or VIL
=
VIN VCC or GND
=
±
±
±
5.5
0–5.5
5.5
0.25
2.5
1.0
µA
µA
µA
VOUT VCC or GND
=
VIN OE VIH or VIL
=
±
IIN
Input Leakage
Current
0.1
VIN 5.5V or GND
(T/R, OE )
ICC
=
VIN VCC or GND
Quiescent Supply
Current
4.0
40.0
1.50
+5.0
=
VIN 3.4V
ICCT
Maximum ICC/Input
=
5.5
0.0
1.35
+0.5
mA
µA
Other Inputs VCC
or GND
IOFF
Output Leakage
Current (Power
Down State)
=
VOUT 5.5V
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4
DC Characteristics for VHCT Family Devices
=
Symbol
Parameter
VCC
(V)
TA 25˚C
Units
Conditions
Typ
Limits
=
CL 50 pF
VOLP (Note 5)
VOLV (Note 5)
VIHD (Note 5)
VILD (Note 5)
Quiet Output Maximum
Dynamic VOL
1.1
1.6
V
V
V
V
=
CL 50 pF
Quiet Output Minimum
Dynamic VOL
−1.1
−1.6
2.0
=
CL 50 pF
Minimum High Level
Dynamic Input Voltage
Maximum Low Level
Dynamic Input Voltage
=
CL 50 pF
0.8
Note 5: Parameter guaranteed by design.
AC Electrical Characteristics for VHC Family Devices
=
=
Symbol
Parameter
VCC
(V)
TA 25˚C
TA −40˚C
Units
Conditions
to +85˚C
Min
Typ
5.8
Max
8.4
Min
Max
10.0
13.5
6.5
=
CL 15 pF
±
tPLH
Propagation Delay
Time
3.3 0.3
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
ns
ns
ns
ns
ns
ns
pF
=
tPHL
8.3
11.9
5.5
CL 50 pF
=
±
5.0 0.5
4.0
CL 15 pF
=
5.5
7.5
8.5
CL 50 pF
=
=
±
tPZL
tPZH
3-STATE Output
Enable Time
3.3 0.3
8.5
13.2
16.7
8.5
15.5
19.0
10.0
12.0
18.0
11.0
1.5
RL 1 kΩ
CL 15 pF
=
11.0
5.8
CL 50 pF
=
±
5.0 0.5
CL 15 pF
=
7.3
10.6
15.8
9.7
CL 50 pF
=
=
±
tPLZ
3-STATE Output
Disable Time
Output to Output
Skew
3.3 0.3
11.5
7.0
RL 1 kΩ
CL 50 pF
=
±
tPHZ
5.0 0.5
CL 50 pF
=
±
tOSLH
tOSHL
CIN
3.3 0.3
1.5
(Note 6)
CL 50 pF
=
±
5.0 0.5
1.0
1.0
CL 50 pF
=
VCC Open
Input Capacitance
4
10
10
(T/R, OE )
CI/O
=
Output Capacitance
8
pF
pF
VCC 5.0V
CPD
Power Dissipation
Capacitance
21
(Note 7)
=
=
|t
PHL max
Note 6: Parameter guaranteed by design. t
|t
PLH max
− t
|; t
PLH min OSHL
− t
|
PHL min
OSLH
Note 7:
C
is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average oper-
PD
=
*
*
f
IN
ating current can be obtained by the equation: I
(opr.)
C
V
+ I /8 (per Bit).
CC
CC
PD
CC
5
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AC Electrical Characteristics for VHCT Family Devices
=
=
Symbol
Parameter
VCC
(V)
TA 25˚C
TA −40˚C
Units
Conditions
to +85˚C
Min
Typ
4.5
Max
7.7
Min
Max
8.5
=
±
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
tOSLH
tOSHL
CIN
Propagation Delay
Time
5.0 0.5
1.0
1.0
1.0
1.0
1.0
ns
ns
ns
ns
CL 15 pF
=
5.3
8.7
9.5
CL 50 pF
=
=
±
3-STATE Output
Enable Time
5.0 0.5
8.9
13.8
14.8
15.4
15.0
16.0
16.5
RL 1 kΩ
CL 15 pF
=
9.7
CL 50 pF
=
=
±
3-STATE Output
Disable Time
5.0 0.5
10.0
RL 1 kΩ
CL 50 pF
=
±
Output to Output Skew
5.0 0.5
1.0
10
1.0
10
(Note 8)
CL 50 pF
=
VCC Open
Input Capacitance
Output Capacitance
4
9
pF
pF
=
CI/O
CPD
VCC 5.0V
Power Dissipation
Capacitance
(Note 9)
23
pF
=
=
|t
PHL max
Note 8: Parameter guaranteed by design. t
OSLH
|t
PLH max
− t
|; t
PLH min OSHL
− t
|
PHL min
Note 9:
C
is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average oper-
PD
=
*
*
f
IN
ating current can be obtained by the equation: I
(opr.)
C
V
CC
+ I /8 (per Bit).
CC
CC
PD
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6
7
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Package —JEDEC SOIC (M)
Package Number M20B
20-Lead Small Outline Package EIAJ SOIC (SJ)
Package Number M20D
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8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic JEDEC TSSOP Type I (MTC)
Package Number MTC20
9
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead (0.300" Wide) Molded Dual-In-Line Package
Package Number N20A
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
Fairchild Semiconductor
Corporation
Fairchild Semiconductor
Europe
Fairchild Semiconductor
Hong Kong Ltd.
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Japan Ltd.
Americas
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Tel: 1-888-522-5372
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Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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