74ABT245CMTCX

© 1999 Fairchild Semiconductor Corporation DS010945 www.fairchildsemi.com
September 1991
Revised November 1999
74ABT245 Octal Bi-Directional Transceiver with 3-STATE Outputs
74ABT245
Octal Bi-Directional Transceiver with 3-STATE Outputs
General Description
The ABT245 contains eight non-inverting bidirectional buff-
ers with 3-STATE outputs and is intended for bus-oriented
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,
disables both A and B ports by placing them in a HIGH Z
condition.
Features
Bidirectional non-inverting buffers
A and B output sink capability of 64 mA, source
capability of 32 mA
Guaranteed output skew
Guaranteed multiple output switching specifications
Output switching specified for both 50 pF and 250 pF
loads
Guaranteed simultaneous switching, noise level and
dynamic threshold performance
Guaranteed latchup protection
High impedance glitch-free bus loading during entire
power up and power down cycle
Non-destructive hot insertion capability
Disable time is less than enable time to avoid bus
contention
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagram Pin Descriptions
Order Number Package Number Package Description
74ABT245CSC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Body
74ABT245CSJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ABT245CMSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74ABT245CMTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ABT245CPC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names Description
OE
Output Enable Input (Active LOW)
T/R
Transmit/Receive Input
A
0
A
7
Side A Inputs or 3-STATE Outputs
B
0
B
7
Side B Inputs or 3-STATE Outputs
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74ABT245
Logic Symbol Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Logic Diagram
Inputs Output
OE T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH Z State
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74ABT245
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
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
DC Electrical Characteristics
Storage Temperature 65°C to +150°C
Ambient Temperature under Bias 55°C to +125°C
Junction Temperature under Bias 55°C to +150°C
V
CC
Pin Potential to Ground Pin 0.5V to +7.0V
Input Voltage (Note 2) 0.5V to +7.0V
Input Current (Note 2) 30 mA to +5.0 mA
Voltage Applied to Any Output
in the Disabled or
Power-off State 0.5V to 5.5V
in the HIGH State 0.5V to V
CC
Current Applied to Output
in LOW State (Max) twice the rated I
OL
(mA)
DC Latchup Source Current 500 mA
Over Voltage Latchup (I/O) 10V
Free Air Ambient Temperature 40°C to +85°C
Supply Voltage +4.5V to +5.5V
Minimum Input Edge Rate (V/t)
Data Input 50 mV/ns
Enable Input 20 mV/ns
Symbol Parameter Min Typ Max Units
V
CC
Conditions
V
IH
Input HIGH Voltage 2.0 V Recognized HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized LOW Signal
V
CD
Input Clamp Diode Voltage 1.2 V Min
I
IN
= 18 mA (OE, T/R)
V
OH
Output HIGH Voltage 2.5 V Min I
OH
= 3 mA (A
n
, B
n
)
2.0 V Min I
OH
= 32 mA (A
n
, B
n
)
V
OL
Output LOW Voltage 0.55 V Min I
OL
= 64 mA (A
n
, B
n
)
I
IH
Input HIGH Current 1
µAMax
V
IN
= 2.7V (OE, T/R)
1
V
IN
= V
CC
(OE, T/R)
I
BVI
Input HIGH Current Breakdown Test 7 µAMax
V
IN
= 7.0V (OE, T/R)
I
BVIT
Input HIGH Current Breakdown Test (I/O) 100 µAMaxV
IN
= 5.5V (A
n
, B
n
)
I
IL
Input LOW Current 1
µAMax
V
IN
= 0.5V (OE, T/R)
1
V
IN
= 0.0V (OE, T/R)
V
ID
Input Leakage Test 4.75 V 0.0
I
ID
= 1.9 µA (OE, T/R)
All Other Pins Grounded
I
IH
+ I
OZH
Output Leakage Current 10 µA0 5.5V
V
OUT
= 2.7V (A
n
, B
n
); OE = 2.0V
I
IL
+ I
OZL
Output Leakage Current 10 µA0 5.5V
V
OUT
= 0.5V (A
n
, B
n
); OE = 2.0V
I
OS
Output Short-Circuit Current 100 275 mA Max V
OUT
= 0.0V (A
n
, B
n
)
I
CEX
Output HIGH Leakage Current 50 µAMaxV
OUT
= V
CC
(A
n
, B
n
)
I
ZZ
Bus Drainage Test 100 µA0.0V
OUT
= 5.5V (A
n
, B
n
);
All Others GND
I
CCH
Power Supply Current 50 µA Max All Outputs HIGH
I
CCL
Power Supply Current 30 mA Max All Outputs LOW
I
CCZ
Power Supply Current 50 µAMax
OE = V
CC
, T/R = GND or V
CC
;
All Other GND or V
CC
I
CCT
Additional Outputs Enabled 2.5 mA V
I
= V
CC
2.1V
I
CC
/Input Outputs 3-STATE 2.5 mA Max
OE, T/R V
I
= V
CC
2.1V
Outputs 3-STATE 50 µA Data Input V
I
= V
CC
2.1V
All Others at V
CC
or GND.
I
CCD
Dynamic I
CC
No Load 0.1 mA/
Max
Outputs Open
MHz
OE = GND, T/R = GND or V
CC
One Bit Toggling, 50% Duty Cycle

74ABT245CMTCX

Mfr. #:
Manufacturer:
ON Semiconductor / Fairchild
Description:
Bus Transceivers Octal Bidir Trans
Lifecycle:
New from this manufacturer.
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