IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
IDT54/74FCT245/A/C
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
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.
FUNCTIONAL BLOCK DIAGRAM
T/R
1
19
OE
A
0
2
18
3
B
0
A
1
17
B
1
A
2
4
16
B
2
A
3
5
15
B
3
6
A
4
14
B
4
A
5
7
13
8
12
B
5
A
6
B
6
A
7
9
11
B
7
MILITARY AND COMMERCIAL TEMPERATURE RANGES
1
c
2001 Integrated Device Technology, Inc.
JUNE 2001
DSC-5421/-
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATION
A
1
A
0
INDEX
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
2
3
4
5
6
7
8
9
10
D20-1
SO20-2
E20-1
19
18
17
16
15
14
13
12
11
OE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
A
2
A
3
A
4
A
5
A
6
4
5
6
7
8
9
10
11
12
13
L20-2
3
2
1
20
19
18
17
16
15
14
OE
T/R
T/R
1
20
V
CC
V
CC
B
0
B
1
B
2
B
3
B
4
A
7
B
7
B
6
B
7
DIP/ SOIC/ CERPACK
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
T
A
T
BIAS
T
STG
P
T
I
OUT
Rating
Terminal Voltage
with Respect to GND
Terminal Voltage
with Respect to GND
Operating Temperature
Temperature Under
Bias
Storage Temperature
Power Dissipation
DC Output Current
Commercial
–0.5 to +7
–0.5 to V
CC
0 to +70
–55 to +125
–55 to +125
0.5
120
Military
–0.5 to +7
–0.5 to V
CC
–55 to +125
–65 to +135
–65 to +150
0.5
120
Unit
V
V
°C
°C
°C
W
mA
8-link
PIN DESCRIPTION
Pin Names
OE
T/R
A
0
-A
7
B
0
-B
7
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
FUNCTION TABLE
(1)
Inputs
OE
L
L
H
T/R
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
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.
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
I/O
Parameter
(1)
Input Capacitance
I/O Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Unit
pF
pF
NOTE:
1. This parameter is measured at characterization but not tested.
2
GND
LCC
TOP VIEW
B
5
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
V
IH
V
IL
I
I H
I
I L
I
I H
I
I L
V
IK
I
OS
V
OH
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
(Except I/O pins)
Input LOW Current
(Except I/O pins)
Input HIGH Current
(I/O pins only)
Input LOW Current
(I/O pins only)
Clamp Diode Voltage
Short Circuit Current
Output HIGH Voltage
V
CC
= Min., I
N
= –18mA
V
CC
= Max.
(3)
, V
O
= GND
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OH
= –32µ A
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
OL
Output LOW Voltage
(Port A and Port B)
I
OH
= –300µ A
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300µ A
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OL
= 300µ A
I
OL
= 48mA MIL.
I
OL
= 64mA COM'L.
V
CC
= Max.
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
V
I
= 2.7V
V
I
= 0.5V
V
I
= GND
V
I
= V
CC
V
I
= 2.7V
V
I
= 0.5V
V
I
= GND
Min.
2
—
—
—
—
—
—
—
—
—
—
–60
V
HC
V
HC
2.4
2.4
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
—
—
–0.7
–120
V
CC
V
CC
4.3
4.3
GND
GND
0.3
0.3
Max.
—
0.8
5
5
(4)
–5
(4)
–5
15
15
(4)
–15
(4)
–15
–1.2
—
—
—
—
—
V
LC
V
LC(4)
0.55
0.55
V
V
mA
V
µA
Unit
V
V
µA
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.
3
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
V
LC
= 0.2V; V
HC
= V
CC
- 0.2V
Symbol
I
CC
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
≥
V
HC
; V
IN
≤
V
LC
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
OE
= GND
T/R = GND or V
CC
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
T/R =
OE
= GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fi = 2.5MHz
50% Duty Cycle
T/R =
OE
= GND
Eight Bits Toggling
Min.
—
—
V
IN
≥
V
HC
V
IN
≤
V
LC
—
Typ.
(2)
0.5
0.5
0.15
Max.
1.5
2
0.25
Unit
mA
mA
mA/MHz
I
C
Total Power Supply Current
(6)
V
IN
≥
V
HC
V
IN
≤
V
LC
(FCT)
V
IN
= 3.4V
V
IN
= GND
V
IN
≥
V
HC
V
IN
≤
V
LC
(FCT)
V
IN
= 3.4V
V
IN
= GND
—
2
4
mA
—
2.3
5
—
3.5
6.5
(5)
—
5.5
14.5
(5)
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.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
i
N
i
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
i
= Input Frequency
N
i
= Number of Inputs at f
i
All currents are in milliamps and all frequencies are in megahertz.
4
IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
54/74FCT245
Com’l.
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
A to B, B to A
Output Enable Time
OE
to A or B
Output Disable Time
OE
to A or B
Output EnableTime
T/R to A or B
(3)
Output Disable Time
T/R to A or B
(3)
Condition
(1)
C
L
= 50 pF
R
L
= 500Ω
Min.
(2)
Max.
1.5
7
1.5
1.5
1.5
1.5
9.5
7.5
9.5
7.5
Mil.
Min.
(2)
Max.
1.5
7.5
1.5
1.5
1.5
1.5
10
10
10
10
54/74FCT245A
Com’l.
Min.
(2)
Max.
1.5
4.6
1.5
1.5
1.5
1.5
6.2
5
6.2
5
Mil.
Min.
(2)
Max.
1.5
4.9
1.5
1.5
1.5
1.5
6.5
6
6.5
6
Min.
(2)
1.5
1.5
1.5
1.5
1.5
54/74FCT245C
Com’l.
Mil.
Unit
ns
ns
ns
ns
ns
Max. Min.
(2)
Ma
x.
4.1
1.5
4.5
5.8
4.8
5.8
4.8
1.5
1.5
1.5
1.5
6.2
5.2
6.2
5.2
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
5
京公网安备 11010802033920号
EEWORLD
