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National Semiconductor Electronic Components Datasheet

74ABT245 Datasheet

Octal Bidirectional Transceiver

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74ABT245 pdf
March 1996
54ABT 74ABT245
Octal Bidirectional Transceiver with TRI-STATE Outputs
General Description
The ’ABT245 contains eight non-inverting bidirectional buff-
ers with TRI-STATE outputs and is intended for bus-orient-
ed applications Current sinking capability is 64 mA on both
the A and B ports The Transmit Receive (T R) input deter-
mines the direction of data flow through the bidirectional
transceiver Transmit (active HIGH) enables data from A
ports to B ports Receive (active LOW) enables data from B
ports to A ports The Output Enable input when HIGH dis-
ables both A and B ports by placing them in a High Z condi-
tion
Features
Y Bidirectional non-inverting buffers
Y A and B output sink capability of 64 mA source capa-
bility of 32 mA
Y Guaranteed output skew
Y Guaranteed multiple output switching specifications
Y Output switching specified for both 50 pF and 250 pF
loads
Y Guaranteed simultaneous switching noise level and dy-
namic threshold performance
Y Guaranteed latchup protection
Y High impedance glitch-free bus loading during entire
power up and power down cycle
Y Non-destructive hot insertion capability
Y Disable time is less than enable time to avoid bus
contention
Y Standard Military Drawing (SMD) 5962-9214801
Commercial
Military
Package
Number
Package Description
74ABT245CSC (Note 1)
M20B 20-Lead (0 300 Wide) Molded Small Outline JEDEC
74ABT245CSJ (Note 1)
M20D 20-Lead (0 300 Wide) Molded Small Outline EIAJ
74ABT245CPC
N20B 20-Lead (0 300 Wide) Molded Dual-In-Line
54ABT245J 883 J20A 20-Lead Ceramic Dual-In-Line
74ABT245CMSA (Note 1)
MSA20 20-Lead Molded Shrink Small Outline EIAJ Type II
54ABT245W 883 W20A 20-Lead Cerpak
54ABT245E 883 E20A 20-Lead Ceramic Leadless Chip Carrier Type C
74ABT245CMTC (Notes 1 2)
MTC20 20-Lead Molded Thin Shrink Small Outline JEDEC
Note 1 Devices also available in 13 reel Use suffix e SCX SJX MSAX and MTCX
Note 2 Contact factory for package availability
Logic Symbol
Connection Diagrams
Pin Assignment for DIP
Flatpak SSOP and SOIC
Pin Assignment for LCC
TL F 10945–1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL F 10945
TL F 10945 – 5
RRD-B30M36 Printed in U S A
TL F 10945 – 3
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National Semiconductor Electronic Components Datasheet

74ABT245 Datasheet

Octal Bidirectional Transceiver

No Preview Available !

74ABT245 pdf
Pin Descriptions
Pin Names
OE
TR
A0 – A7
B0 – B7
Description
Output Enable Input (Active LOW)
Transmit Receive Input
Side A Inputs or TRI-STATE Outputs
Side B Inputs or TRI-STATE Outputs
Logic Diagram
Truth Table
Inputs
OE T R
LL
LH
HX
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Output
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
TL F 10945 – 4
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2



National Semiconductor Electronic Components Datasheet

74ABT245 Datasheet

Octal Bidirectional Transceiver

No Preview Available !

74ABT245 pdf
Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Storage Temperature
b65 C to a150 C
Ambient Temperature under Bias
b55 C to a125 C
Junction Temperature under Bias
Ceramic
Plastic
b55 C to a175 C
b55 C to a150 C
VCC Pin Potential to
Ground Pin
b0 5V to a7 0V
Input Voltage (Note 2)
b0 5V to a7 0V
Input Current (Note 2)
b30 mA to a5 0 mA
Voltage Applied to Any Output
in the Disabled or
Power-off State
in the HIGH State
Current Applied to Output
in LOW State (Max)
b0 5V to 5 5V
b0 5V to VCC
twice the rated IOL (mA)
DC Latchup Source Current
b500 mA
Over Voltage Latchup (I O)
10V
Note 1 Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired Functional operation under
these conditions is not implied
Note 2 Either voltage limit or current limit is sufficient to protect inputs
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
Commercial
b55 C to a125 C
b40 C to a85 C
Supply Voltage
Military
Commercial
a4 5V to a5 5V
a4 5V to a5 5V
Minimum Input Edge Rate
Data Input
Enable Input
(DV Dt)
50 mV ns
20 mV ns
DC Electrical Characteristics
Symbol
Parameter
VIH Input HIGH Voltage
VIL Input LOW Voltage
VCD Input Clamp Diode Voltage
VOH Output HIGH 54ABT 74ABT
Voltage
54ABT
74ABT
VOL Output LOW 54ABT
Voltage
74ABT
IIH Input HIGH Current
IBVI
IBVIT
IIL
Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown Test (I O)
Input LOW Current
VID Input Leakage Test
IIH a IOZH
IIL a IOZL
IOS
ICEX
IZZ
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Output High Leakage Current
Bus Drainage Test
ICCH
ICCL
ICCZ
Power Supply Current
Power Supply Current
Power Supply Current
Note 3 Guaranteed but not tested
ABT245
Min Typ Max
20
08
b1 2
25
20
20
0 55
0 55
5
5
7
4 75
b100
100
b5
b5
50
b50
b275
50
100
50
30
50
Units
V
V
V
V
V
V
V
mA
mA
mA
mA
V
mA
mA
mA
mA
mA
mA
mA
mA
VCC
Min
Min
Min
Min
Min
Max
Max
Max
Max
00
0 b 5 5V
0 b 5 5V
Max
Max
00
Max
Max
Max
Conditions
Recognized HIGH Signal
Recognized LOW Signal
IIN e b18 mA (OE T R)
IOH e b3 mA (An Bn)
IOH e b24 mA (An Bn)
IOH e b32 mA (An Bn)
IOL e 48 mA (An Bn)
IOL e 64 mA (An Bn)
VIN e 2 7V (OE T R) (Note 3)
VIN e VCC (OE T R)
VIN e 7 0V (OE T R)
VIN e 5 5V (An Bn)
VIN e 0 5V (OE T R) (Note 3)
VIN e 0 0V (OE T R)
IID e 1 9 mA (OE T R)
All Other Pins Grounded
VOUT e 2 7V (An Bn) OE e 2 0V
VOUT e 0 5V (An Bn) OE e 2 0V
VOUT e 0 0V (An Bn)
VOUT e VCC (An Bn)
VOUT e 5 5V (An Bn)
All Others GND
All Outputs HIGH
All Outputs LOW
OE e VCC T R e GND or VCC
All Other GND or VCC
3 http www national com




Part Number 74ABT245
Description Octal Bidirectional Transceiver
Maker National Semiconductor
Total Page 14 Pages
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