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DM74ALS245AN

Part # DM74ALS245AN
Description IC TRANSCVR TRI-ST 8BIT 20DIP
Category IC
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS006213 www.fairchildsemi.com
September 1986
Revised February 2000
DM74ALS245A Octal 3-STATE Bus Transceiver
DM74ALS245A
Octal 3-STATE Bus Transceiver
General Description
This advanced low power Schottky device contains 8 pairs
of 3-STATE logic elements configured as octal bus trans-
ceivers. These circuits are designed for use in memory,
microprocessor systems and in asynchronous bidirectional
data buses. Two way communication between buses is
controlled by the (DIR) input. Data transmits either from the
A bus to the B bus or from the B bus to the A bus. Both the
driver and receiver outputs can be disabled via the (G
)
enable input which causes outputs to enter the high imped-
ance mode so that the buses are effectively isolated.
Features
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Non-inverting logic output
Glitch free bus during power up and down
3-STATE outputs independently controlled on A and B
buses
Low output impedance to drive terminated transmission
lines to 133
Switching response specified into 500/50 pF
Specified to interface with CMOS at V
OH
= V
CC
2V
PNP inputs to reduce input loading
Switching specifications guaranteed over full tempera-
ture and V
CC
range
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
H = HIGH Logic Level
L = LOW Logic Level
X = Either HIGH or LOW Logic Level
Order Number Package Number Package Description
DM74ALS245AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS245ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS245AMSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS245AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Control
Inputs Operation
G
DIR
L L B Data to A Bus
L H A Data to B Bus
H X Hi-Z
www.fairchildsemi.com 2
DM74ALS245A
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
Switching Characteristics (Note 2)
over recommended operating free air temperature range
Note 2: Switching characteristic conditions are V
CC
= 4.5V to 5.5V, R
L
= 500, C
L
= 50 pF.
Supply Voltage 7V
Input Voltage
Control Inputs 7V
I/O Ports 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range 65°C to +150°C
Typical θ
JA
N Package 53.0°C/W
M Package 72.0°C/W
Symbol Parameter Min Typ Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current 15 mA
I
OL
LOW Level Output Current 24 mA
T
A
Operating Free Air Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
IN
= 18 mA 1.5 V
V
OH
HIGH Level V
CC
= 4.5V, I
OH
= 3 mA 2.4 3.2 V
Output Voltage V
CC
= 4.5V, I
OH
= Max 2 2.3 V
I
OH
= 0.4 mA, V
CC
= 4.5V to 5.5V V
CC
2V
V
OL
LOW Level Output Voltage V
CC
= 4.5V I
OL
= 24 mA 0.35 0.5 V
I
I
Input Current at Maximum V
CC
= 5.5V V
IN
= 7V Control Inputs 0.1
mA
Input Voltage V
IN
= 5.5V A or B Ports 0.1
I
IH
HIGH Level Input Current V
CC
= 5.5V, V
IN
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= 5.5V, V
IN
= 0.4V 0.1 mA
I
O
Output Drive Current V
CC
= 5.5V, V
OUT
= 2.25V 30 112 mA
I
CC
Supply Current V
CC
= 5.5V Outputs HIGH 30 45 mA
Outputs LOW 36 55 mA
3-STATE 38 58 mA
Symbol Parameter Circuit Configuration Min Max Units
t
PLH
Propagation Delay Time
310ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
310ns
HIGH-to-LOW Level Output
t
PZL
Output Enable Time to LOW Level 5 20 ns
t
PZH
Output Enable Time to HIGH Level 5 20 ns
t
PLZ
Output Disable Time from LOW Level 4 15 ns
t
PHZ
Output Disable Time from HIGH Level 2 10 ns
3 www.fairchildsemi.com
DM74ALS245A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
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