Part Number: 54F253DM

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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.

1
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
JUNE 2001
2001 Integrated Device Technology, Inc. DSC-5421/-c
IDT54/74FCT245/A/C
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT245 is designed for asynchronous two-
way communication between data buses. The transmit/receive (T/R) input
determines the direction of data flow through the bidirectional transceiver.
Transmit (active high) enables data from A ports to B ports, and receive
(active low) from B ports to A ports. The output enable (OE) input, when
high, disables both A and B ports by placing them in High-Z condition.
The FCT245 transceivers have non-inverting outputs.
T/R
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
OE
1
2
3
4
5
6
19
18
17
16
15
14
13
12
11
7
8
9
FEATURES:
IDT54/74FCT245 equivalent to FAST™ speed
IDT54/74FCT245A 25% faster than FAST
IDT54/74FCT245C 40% faster than FAST
TTL input and output level compatible
CMOS output level compatible
I
OL
= 64mA (commercial) and 48mA (military)
Input current levels only 5µA max.
CMOS power levels (2.5mW typ. static)
Direction control and over-riding 3-state control
Military product compliant to MIL-STD-883, Class B and DESC
listed
Meets or exceeds JEDEC Standard 18 specifications
Available in the following packages:
Commercial: SOIC
Military: CERDIP, LCC, CERPACK
FUNCTIONAL BLOCK DIAGRAM
2
MILITARY AND COMMERCIAL TEMPERATURE RANGES
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
1
23
4
5
7
9
6
8
10 11 12 13
14
15
16
17
18
1920
L20-2
B
2
B
0
B
1
B
3
B
4
T/R
A
1
A
0
V
CC
A
7
GND
B
7
B
6
B
5
INDEX
A
2
A
3
A
6
A
4
A
5
OE
2
3
1
16
15
14
11
19
18
20
17
13
12
5
6
7
4
D20-1
SO20-2
E20-1
8
9
10
A
2
A
0
A
1
V
CC
A
3
A
6
A
4
A
5
A
7
GND
OE
B
2
B
0
B
1
B
3
B
6
B
4
B
5
B
7
T/R
CAPACITANCE (T
A
= +25
O
C, f = 1.0MHz)
Symbol Parameter
(1)
Conditions Typ. Max. Unit
C
IN
Input Capacitance V
IN
= 0V 6 10 pF
C
I/O
I/O Capacitance V
OUT
= 0V 8 12 pF
NOTE:
1. This parameter is measured at characterization but not tested.
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol Rating Commercial Military Unit
V
TERM
(2)
Terminal Voltage
with Respect to GND
–0.5 to +7 –0.5 to +7 V
V
TERM
(3)
Terminal Voltage
with Respect to GND
–0.5 to V
CC
–0.5 to V
CC
V
T
A
Operating Temperature 0 to +70 –55 to +125 °C
T
BIAS
Temperature Under
Bias
–55 to +125 –65 to +135 °C
T
STG
Storage Temperature –55 to +125 –65 to +150 °C
P
T
Power Dissipation 0.5 0.5 W
I
OUT
DC Output Current 120 120 mA
8-link
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability. No
terminal voltage may exceed V
CC
by +.5V unless otherwise noted.
2. Input and V
CC
terminals only.
3. Outputs and I/O terminals only.
DIP/ SOIC/ CERPACK
TOP VIEW
LCC
TOP VIEW
PIN CONFIGURATION
PIN DESCRIPTION
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
FUNCTION TABLE
(1)
Inputs
OE T/R
Outputs
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
3
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: V
LC
= 0.2V; V
HC
= V
CC
- 0.2V
Commercial: T
A
= 0°C to +70°C, V
CC
= 5.0V ± 5%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V ± 10%
Symbol Parameter Test Conditions
(1)
Min. Typ.
(2)
Max. Unit
V
IH
Input HIGH Level Guaranteed Logic HIGH Level 2 V
V
IL
Input LOW Level Guaranteed Logic LOW Level 0.8 V
I
I H
Input HIGH Current V
CC
= Max. V
I
= V
CC
—— 5µA
(Except I/O pins) V
I
= 2.7V 5
(4)
I
I L
Input LOW Current V
I
= 0.5V –5
(4)
(Except I/O pins) V
I
= GND –5
I
I H
Input HIGH Current V
CC
= Max. V
I
= V
CC
——15µA
(I/O pins only) V
I
= 2.7V 15
(4)
I
I L
Input LOW Current V
I
= 0.5V –15
(4)
(I/O pins only) V
I
= GND –15
V
IK
Clamp Diode Voltage V
CC
= Min., I
N
= –18mA –0.7 –1.2 V
I
OS
Short Circuit Current V
CC
= Max.
(3)
, V
O
= GND –60 –120 mA
V
OH
Output HIGH Voltage V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OH
= –32µA V
HC
V
CC
—V
V
CC
= Min. I
OH
= –300µA V
HC
V
CC
V
IN
= V
IH
or V
IL
I
OH
= –12mA MIL. 2.4 4.3
I
OH
= –15mA COM'L. 2.4 4.3
V
OL
Output LOW Voltage V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300µA GND V
LC
V
(Port A and Port B) V
CC
= Min. I
OL
= 300µA GND V
LC
(4)
V
IN
= V
IH
or V
IL
I
OL
= 48mA MIL. 0.3 0.55
I
OL
= 64mA COM'L. 0.3 0.55
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. This parameter is guaranteed but not tested.
123NEXT

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