IDT54/74FCT245/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
FEATURES:
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IDT54/74FCT245/A/C
DESCRIPTION:
IDT54FCT245 equivalent to FAST™ speed and drive
IDT54/74FCT245A 25% faster than FAST
IDT74FCT245C 40% faster than FAST
TTL input and output compatible
CMOS output level compatible
IOL = 64mA (commercial) and 48mA (military)
Current levels only 5µA max.
µ
CMOS power levels (2.5mW typ. static)
Direction control and overriding 3-state control
MIlitary product compliant to MIL-STD-883, Class B
Meets or exceeds JEDEC Standard 18 specifications
Available in the following packages:
– Commercial: SOIC
– Military: CERDIP, LCC
The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT245 is designed for asynchronous twoway 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
A0
2
18
B0
3
A1
17
B1
A2
4
16
B2
A3
5
15
B3
6
A4
14
B4
A5
7
13
A6
B5
8
12
B6
A7
9
11
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
B7
JUNE 2002
1
© 2002 Integrated Device Technology, Inc.
DSC-5421/1
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: VLC = 0.2V; VHC = VCC - 0.2V
Commercial: TA = 0°C to +70°C, VCC = 5.0V ±5%, Military: TA = -55°C to +125°C, VCC = 5.0V ±10%
Symbol
Test Conditions(1)
Parameter
Min.
Typ.(2)
Max.
Unit
VIH
Input HIGH Level
Guaranteed Logic HIGH Level
2
—
—
V
VIL
Input LOW Level
Guaranteed Logic LOW Level
—
—
0.8
V
IIH
Input HIGH Current
VI = VCC
—
—
5
VI = 2.7V
VCC = Max.
—
—
5(4)
VI = 0.5V
IOZH
—
—
—
–5
VO = VCC
VO = 2.7V
VO = 0.5V
VO = GND
Input LOW Current
—
VI = GND
IIL
—
—
—
—
–0.7
15
15(4)
–15(4)
–15
–1.2
VCC = Max.
IOZL
Off State (High Impedance)
Output Current
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
—
—
—
—
—
IOS
Short Circuit Current
VCC = Max., VO = GND(3)
–60
–120
—
VOH
Output HIGH Voltage
VCC = 3V, VIN = VLC or VHC, IOH = –32µA
VCC = Min
IOH = –300µA
VIN = VIH or VIL
IOH = –12mA MIL
IOH = –15mA COM'L
VCC = 3V, VIN = VLC or VHC, IOL = 300µA
VCC = Min
IOL = 300µA
VIN = VIH or VIL
IOL = 32mA MIL
IOL = 48mA COM'L
VHC
VHC
2.4
2.4
—
—
—
—
VCC
VCC
4.3
4.3
GND
GND
0.3
0.3
—
—
—
—
VLC
VLC(4)
0.55
0.55
VOL
Output LOW Voltage
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not ttested.
3
µA
–5(4)
µA
V
mA
V
V
