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74VHCT 245 D
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Datasheet 74VHCT 245 D Datasheet

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Page 1
October 1995
74VHC245
Octal Bidirectional Transceiver with TRI-STATE Outputs
74VHC245#74VHCT245 Octal Bidirectional Transceiver with TRI-STATE
General Description
The VHC/VHCT245 is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technolo­gy. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low pow­er dissipation. The ’VHC245 is intended for bidirectional asynchronous communication between data busses. The di­rection of data transmission is determined by the level of the T/R
input. The enable input can be used to disable the de­vice so that the busses are effectively isolated. All inputs are equipped with protection circuits against static dis­charge.
Commercial
74VHC245M M20B 20 Lead Molded JEDEC SOIC
74VHC245SJ M20D 20 Lead Molded EIAJ SOIC
74VHC245MSC MSC20 20 Lead Molded EIAJ Type 1 SSOP
74VHC245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP
74VHC245N N20A 20 Lead Molded DIP
74VHCT245M M20B 20 Lead Molded JEDEC SOIC
74VHCT245SJ M20D 20 Lead Molded EIAJ SOIC
74VHCT245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP
74VHCT245N N20A 20 Lead Molded DIP
Note: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ‘‘X’’ to the ordering code.
EIAJ Type 1 SSOP available on Tape and Reel only, order MSCX.
Package
Number
Features
Y
High Noise Immunity:
VHC V VHCT V
Y
Power Down Protection:
VHC Inputs Only VHCT Inputs and Outputs
Y
Low Noise:
VHC V VHCT V
Y
Low Power Dissipation:
I
CC
Y
Balanced Propagation Delays: t
Y
Pin and Function Compatible with 74HC/HCT245
e
NIH
e
2.0V, V
IH
e
OLP
e
OLP
e
4 mA (Max)@T
Package Description
e
V
NIL
IL
0.9V (typ)
1.1V (typ)
28% VCC(Min)
e
0.8V
e
25§C
a
pLH
Outputs
É
j
t
pHL
#
74VHCT245
Logic Symbol Connection Diagram
Pin Assignment for DIP,
IEEE/IEC
SSOP, TSSOP and SOIC
Pin Description
Pin
Names
OE Output Enable Input T/R A
0–A7
B
0–B7
Description
Transmit/Receive Input Side A Inputs or
TRI-STATE Outputs Side B Inputs or
TRI-STATE Outputs
Truth Table
Inputs
OE T/R
TL/F/11520– 2
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M125/Printed in U. S. A.
TL/F/11520
TL/F/11520– 3
L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State
HeHIGH Voltage Level XeImmaterial
e
LOW Voltage Level
L
Outputs
Page 2
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
CC
)
DC Input Voltage (VIN) (T/R,OE)
DC Output Voltage (V
VHC
OUT
)
VHCT*
Input Diode Current (I
) (T/R,OE)
IK
Output Diode Current (IOK)
(VHC) (VHCT)
DC Output Current (I
OUT
)
DC VCC/GND Current (ICC)
Storage Temperature (T
STG
)
Lead Temperature (TL)
(Soldering, 10 seconds) 260
l
*V
VCConly if output is in H or Z state.
OUT
b
0.5V toa7.0V
b
b
0.5V to V
b
b
65§Ctoa150§C
0.5V to 7.0V
a
0.5V
CC
0.5V to 7.0V
b
20 mA
g
20 mA
b
20 mA
g
25 mA
g
75 mA
C
§
DC Characteristics for ’VHC Family Devices
74VHC 74VHC
V
Symbol Parameter
V
IH
V
IL
V
OH
V
OL
I
OZ
I
IN
(T/R
I
CC
High Level Input Voltage 2.0 1.50 1.50
Low Level Input Voltage 2.0 0.50 0.50
High Level Output 2.0 1.9 2.0 1.9 V Voltage
Low Level Output 2.0 0.0 0.1 0.1 V Voltage
TRI-STATE Output Off- V State Current
Input Leakage Current
,OE)
Quiescent Supply Current
CC
(V)
3.0–5.5 0.7 V
3.0–5.5 0.3 V
3.0 2.9 3.0 2.9 V or V
4.5 4.4 4.5 4.4
4.5 2.58 2.48
4.5 3.94 3.80 I
3.0 0.0 0.1 0.1 V or V
4.5 0.0 0.1 0.1
3.0 0.36 0.44
4.5 0.36 0.44 I
5.5
0–5.5
5.5 4.0 40.0 mA
e
T
25§C
A
Min Typ Max Min Max
CC
g
0.25
g
Note 1:
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. National does not recommend operation out­side databook specifications.
Recommended Operating Conditions
Supply Voltage (VCC)
VHC 2.0V to 5.5V VHCT* 4.5V to 5.5V
Input Voltage (V
Output Voltage (V
Operating Temperature (T
74 VHC/VHCT
Input Rise and Fall Time (tr,tf)
e
V
CC
e
V
CC
0.7 V
CC
0.1
)(T/R,OE) 0V to 5.5V
IN
) 0VtoV
OUT
OPR
)
b
40§Ctoa85§C
3.3Vg0.3V (VHC only) 0E100 ns/V
5.0Vg0.5V 0E20 ns/V
eb
40§C
T
A
a
to
85§C
CC
0.3 V
Units Conditions
V
V
CC
V
V
g
2.5 mAV V
g
1.0 mA
V
V
e
VIHI
IN
IL
e
VIHI
IN
IL
e
VCCor GND
IN
e
VCCor GND
OUT
OEeVIHor V
IN
e
5.5V or GND
IN
e
VCCor GND
IN
eb
OH
eb
I
OH
eb
OH
e
50 mA
OL
e
I
4mA
OL
e
8mA
OL
IL
50 mA
4mA 8mA
CC
2
Page 3
DC Characteristics for ’VHC Family Devices:
Symbol Parameter
*V
OLP
*V
OLV
*V
IHD
*V
ILD
*Parameter guaranteed by design.
Quiet Output Maximum Dynamic V
OL
Quiet Output Minimum Dynamic V
OL
Minimum High Level Dynamic Input Voltage
Maximum Low Level Dynamic Input Voltage
DC Characteristics for ’VHCT Family Devices
74VHCT 74VHCT
V
Symbol Parameter
V
IH
V
IL
V
OH
V
OL
I
OZ
I
IN
(T/R
I
CC
I
CCT
I
OPD
High Level 4.5 2.0 2.0 Input Voltage 5.5 2.0 2.0
Low Level 4.5 0.8 0.8 Input Voltage 5.5 0.8 0.8
High Level 4.5 3.15 3.65 3.15 V V Output Voltage or V
Low Level 4.5 0.0 0.1 0.1 V V Output Voltage or V
TRI-STATE Output V Off-State Current 5.5
Input Leakage
,OE) Current
Quiescent Supply Current
Maximum ICC/Input V
Output Leakage Current (Power 0.0 Down State)
CC
(V) to
4.5 2.5 2.4 V I
4.5 0.36 0.44 V I
0–5.5
5.5 4.0 40.0 mA
5.5 1.35 1.50 mA Other Inputs
e
T
25§C
A
Min Typ Max Min Max
g
0.25
g
0.1
a
0.5
74VHC
V
(V)
CC
e
T
A
Typ Limits
5.0 0.9 1.2 V
b
5.0
0.9
5.0 3.5 V
5.0 1.5 V
eb
40§C
T
A
a
85§C
Units Conditions
V
V
g
2.5 mAV
g
1.0 mA
a
5.0 mAV
25§C Units Conditions
e
C
50 pF
L
e
50 pF
C
b
1.2 V
IN
IN
IN
OUT
V
IN
V
IN
V
IN
IN
or GND
OUT
e
VIHI
IL
e
VIHI
IL
e
VCCor GND
e
OEeVIHor V
e
5.5V or GND
e
VCCor GND
e
3.4V
e
L
C
L
C
L
eb
OH
eb
OH
e
OL
e
OL
VCCor GND
IL
e
V
CC
5.5V
e
50 pF
e
50 pF
50 mA
8mA
50 mA
8mA
3
Page 4
DC Characteristics for ’VHCT Family Devices:
74VHCT
Symbol Parameter
(V)
CC
e
T
25§C Units Conditions
A
V
Typ Limits
V
* Quiet Output Maximum
OLP
V
* Quiet Output Minimum
OLV
V
* Minimum High Level 2.0
IHD
V
* Maximum Low Level
ILD
*Parameter guaranteed by design.
Dynamic V
Dynamic V
OL
OL
Dynamic Input Voltage
Dynamic Input Voltage
1.1 1.6 V
b
1.1
b
1.6 V
0.8 V
V
e
C
50 pF
L
e
50 pF
C
L
e
C
50 pF
L
e
C
50 pF
L
AC Electrical Characteristics for ’VHC Family Devices
74VHC 74VHC
eb
Symbol Parameter
CC
(V) to
e
T
25§C
A
V
Min Typ Max Min Max
t t
PLH
PHL
Propagation Delay Time 3.3g0.3 5.8 8.4 1.0 10.0
8.3 11.9 1.0 13.5 C
5.0g0.5 4.0 5.5 1.0 6.5
5.5 7.5 1.0 8.5 C
t
PZL
PZH
TRI-STATE Output Enable 3.3g0.3 8.5 13.2 1.0 15.5 Timet
11.0 16.7 1.0 19.0 C
5.0g0.5 5.8 8.5 1.0 10.0
7.3 10.6 1.0 12.0 C
t
PLZ
t
PHZ
t
OSLH
t
OSHL
C
IN
(T/R,OE)
C
I/O
C
PD
Note 1: Parameter guaranteed by design. t
Note 2: CPDis defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: I
TRI-STATE Output 3.3g0.3 11.5 15.8 1.0 18.0 Disable Time
5.0g0.5 7.0 9.7 1.0 11.0 C
Output to Output Skew 3.3g0.3 1.5 1.5
5.0g0.5 1.0 1.0 C
Input Capacitance
410 10 pF
Output Capacitance 8 pF V
Power Dissipation Capacitance
OSLH
e
b
t
l
PLH max
(opr.)eCPD* VCC* f
CC
t
PLH min
21 pF
e
;t
l
OSHL
a
IN
b
t
l
PHL max
ICC/8 (per Bit).
T
A
t
PHL min
40§C
a
85§C
Units Conditions
C
1kX C
1kX C
Open
5.0V
L
L
C
L
L
L
L
C
L
L
L
L
L
L
ns
ns
ns
ns
ns
ns
e
R
L
e
R
L
(Note 1) C
e
V
CC
e
CC
e
e
e
e
e
e
e
e
e
e
e
e
(Note 2)
l
15 pF
50 pF
15 pF
50 pF
15 pF
50 pF
15 pF
50 pF
50 pF
50 pF
50 pF
50 pF
4
Page 5
AC Electrical Characteristics for ’VHCT Family Devices
74VHCT 74VHCT
eb
Symbol Parameter
CC
(V) to
e
T
25§C
A
V
Min Typ Max Min Max
t
PLH
t
PHL
t
PZL
PZH
t
PLZ
t
PHZ
t
OSLH
t
OSHL
C
C
C
Propagation Delay Time 5.0g0.5 4.5 7.7 1.0 8.5
5.3 8.7 1.0 9.5 C
TRI-STATE Output Enable 5.0g0.5 8.9 13.8 1.0 15.0 Timet
TRI-STATE Output 5.0g0.5 Disable Time
Output to Output Skew 5.0g0.5
Input Capacitance 4 10 10 pF V
IN
Output Capacitance 9 pF V
I/O
Power Dissipation Capacitance
PD
Note 1: Parameter guaranteed by design. t
Note 2: CPDis defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: I
OSLH
e
b
t
l
CC
t
PLH max
PLH min
(opr.)eCPD* VCC* f
9.7 14.8 1.0 16.0 C
10.0 15.4 1.0 16.5 ns
1.0 1.0 ns
23 pF
e
;t
l
OSHL
a
IN
b
t
l
PHL max
ICC/8 (per Bit).
T
A
t
PHL min
a
85§C
l
40§C
Units Conditions
ns
ns
e
R
1kX C
L
e
R
1kX C
L
(Note 1) C
e
Open
CC
e
5.0V
CC
(Note 2)
e
C
L
e
L
e
L
e
L
e
L
e
L
15 pF
50 pF
15 pF
50 pF
50 pF
50 pF
5
Page 6
Ordering Information
The device number is used to form part of a simplified purchasing code, where the package type and temperature range are defined as follows:
TL/F/11520– 5
6
Page 7
Physical Dimensions inches (millimeters)
20-Lead Small Outline Integrated CircuitÐJEDEC SOIC (M)
Order Number 74VHC245M, 74VHC245MX, 74VHCT245M, or 74VHCT245MX
NS Package Number M20B
Order Number 74VHC245SJ, 74VHC245SJX, 74VHCT245SJ, or 74VHCT245SJX
20-Lead Small Outline Package EIAJ SOIC (SJ)
NS Package Number M20D
7
Page 8
Physical Dimensions millimeters (Continued)
20-Lead Plastic EIAJ SSOP Type I (MSC)
Order Number 74VHC245MSCX
NS Package Number MSC20
8
Page 9
Physical Dimensions millimeters (Continued)
Order Number 74VHC245MTC, 74VHC245MTCX, 74VHCT245MTC or 74VHCT245MTCX
20-Lead Plastic JEDEC TSSOP Type I (MTC)
NS Package Number MTC20
9
Page 10
Physical Dimensions inches (millimeters) (Continued)
74VHCT245
#
74VHC245
20-Lead (0.300×Wide) Molded Dual-In-Line Package
Order Number 74VHCT245N
NS Package Number N20A
Octal Bidirectional Transceiver with TRI-STATE Outputs
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user.
National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.
1111 West Bardin Road Fax: ( Arlington, TX 76017 Email: cnjwge@tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( Fax: 1(800) 737-7018 English Tel: (
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Fran3ais Tel: ( Italiano Tel: (
a
49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309
a
49) 0-180-530 85 85 Tsimshatsui, Kowloon
a
49) 0-180-532 78 32 Hong Kong
a
49) 0-180-532 93 58 Tel: (852) 2737-1600
a
49) 0-180-534 16 80 Fax: (852) 2736-9960
Page 11
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