74FCT245ASO [IDT]
SOIC-20, Tube;
| 型号： | 74FCT245ASO |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | SOIC-20, Tube |
| 文件： | 总7页 (文件大小：85K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FAST CMOS OCTAL
IDT54/74FCT245/A/C
BIDIRECTIONAL
TRANSCEIVER
FEATURES:
DESCRIPTION:
• IDT54FCT245 equivalent to FAST™ speed and drive
• IDT54/74FCT245A 25% faster than FAST
• IDT74FCT245C 40% faster than FAST
• TTL input and output compatible
TheIDToctalbidirectionaltransceiversarebuiltusinganadvanceddual
metalCMOStechnology. TheFCT245isdesignedforasynchronoustwo-
waycommunicationbetweendatabuses. Thetransmit/receive(T/R)input
determinesthedirectionofdataflowthroughthebidirectionaltransceiver.
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.
• CMOS output level compatible
• IOL = 64mA (commercial) and 48mA (military)
• Current levels only 5µA max.
• 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
FUNCTIONALBLOCKDIAGRAM
1
T/R
19
OE
2
A0
18
B0
3
A1
17
B1
4
A2
16
B2
5
A3
15
B3
6
A4
14
B4
7
A5
13
B5
8
A6
12
B6
9
A7
11
B7
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
JUNE 2002
1
© 2002 Integrated Device Technology, Inc.
DSC-5421/1
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
PINCONFIGURATION
VCC
20
19
18
17
16
15
14
13
12
11
1
2
3
4
T/R
A0
A1
A2
A3
INDEX
OE
B0
B1
B2
B3
3
2
20 19
1
4
5
6
7
8
18
17
16
15
14
A2
B0
B1
B2
B3
B4
A3
5
A4
A5
A6
A4
A5
A6
A7
6
B4
B5
B6
B7
7
8
9
10 11 12 13
9
GND
10
CERDIP/ SOIC
TOP VIEW
LCC
TOP VIEW
ABSOLUTEMAXIMUMRATINGS(1)
PINDESCRIPTION
Pin Names
Symbol Rating
Commercial
Military
Unit
Description
(2)
VTERM
Terminal Voltage
–0.5 to +7
–0.5 to +7
V
OE
T/R
A0 - A7
OutputEnableInput(ActiveLOW)
Transmit/RecieveInput
with Respect to GND
Terminal Voltage
(3)
SideAInputsor3-StateOutputs
SideBInputsor3-StateOutputs
VTERM
–0.5 to VCC –0.5 to VCC
V
B0 - B7
with Respect to GND
Operating Temperature
Temperature under BIAS
Storage Temperature
Power Dissipation
TA
0 to +70 –55 to +125
°C
°C
°C
W
TBIAS
TSTG
PT
–55 to +125 –65 to +135
–55 to +125 –65 to +150
0.5
0.5
FUNCTIONTABLE(1)
IOUT
DC Output Current
120
120
mA
Inputs
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
Vcc by +0.5V unless otherwise noted.
OE
L
T/R
L
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
HighZState
L
H
H
X
2. Input and Vcc terminals only.
3. Output and I/O terminals only.
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
CAPACITANCE (TA = +25°C, F = 1.0MHz)
Symbol
Parameter(1)
Input Capacitance
I/O Capacitance
Conditions
Typ.
Max. Unit
CIN
VIN = 0V
6
8
10
12
pF
pF
CI/O
VOUT = 0V
NOTE:
1. This parameter is measured at characterization but not tested.
2
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE
FollowingConditionsApplyUnlessOtherwiseSpecified: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
VIH
Parameter
Input HIGH Level
Test Conditions(1)
Guaranteed Logic HIGH Level
Min.
2
Typ.(2)
—
Max.
—
Unit
V
VIL
Input LOW Level
Guaranteed Logic LOW Level
—
—
—
—
—
—
0.8
5
V
IIH
Input HIGH Current
VI = VCC
VI = 2.7V
VI = 0.5V
VI = GND
—
(4)
VCC = Max.
—
5
µA
µA
IIL
Input LOW Current
—
–5(4)
—
–5
IOZH
IOZL
VO = VCC
VO = 2.7V
VO = 0.5V
VO = GND
—
—
—
—
—
—
—
15
15(4)
–15(4)
–15
Off State (High Impedance)
Output Current
VCC = Max.
—
—
VIK
IOS
Clamp Diode Voltage
Short Circuit Current
Output HIGH Voltage
VCC = Min., IIN = –18mA
VCC = Max., VO = GND(3)
–0.7
–1.2
V
–60
–120
—
—
—
—
—
mA
VOH
VCC = 3V, VIN = VLC or VHC, IOH = –32µA
VCC = Min
VHC
VHC
2.4
2.4
—
—
—
—
VCC
VCC
4.3
IOH = –300µA
IOH = –12mA MIL
IOH = –15mA COM'L
V
V
VIN = VIH or VIL
4.3
VOL
Output LOWVoltage
VCC = 3V, VIN = VLC or VHC, IOL = 300µA
VCC = Min
GND
GND
0.3
VLC
(4)
IOL = 300µA
IOL = 32mA MIL
IOL = 48mA COM'L
VLC
VIN = VIH or VIL
0.55
0.55
0.3
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
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
POWERSUPPLYCHARACTERISTICS
VLC = 0.2V; VHC = VCC - 0.2V
Symbol
Parameter
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
ICC
Quiescent Power Supply Current
VCC = Max.
—
0.2
1.5
mA
VIN ≥ VHC; VIN ≤ VLC
∆ICC
Quiescent Power Supply Current
TTL Inputs HIGH
VCC = Max.
VIN = 3.4V(3)
—
—
0.5
2
mA
ICCD
Dynamic Power Supply
Current(4)
VCC = Max.
Outputs Open
OE = GND
VIN ≥ VHC
VIN ≤ VLC
0.15
0.25
mA/
MHz
T/R = GND or VCC
One Input Toggling
50% Duty Cycle
IC
Total Power Supply Current(6)
VCC = Max.
Outputs Open
fI = 10MHz
VIN ≥ VHC
VIN ≤ VLC
(FCT)
—
—
2
4
5
mA
50% Duty Cycle
T/R = OE = GND
VIN = 3.4V
VIN = GND
2.3
One Bit Toggling
VCC = Max.
Outputs Open
fI = 2.5MHz
VIN ≥ VHC
VIN ≤ VLC
(FCT)
—
—
3.5
5.5
6.5(5)
50% Duty Cycle
T/R = OE = GND
VIN = 3.4V
VIN = GND
14.5(5)
Eight Bits Toggling
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.
3. Per TTL driven input (VIN = 3.4V). All other inputs at VCC 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 ∆ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for register devices (zero for non-register devices)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
4
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE
54FCT245
54/74FCT245A
74FCT245C
Com'l.
Max. Min.(2) Max. Unit
Mil.
Com'l.
Mil.
Min.(2)
Symbol
tPLH
Parameter
PropagationDelay
A to B, B to A
Condition(1)
CL = 50pF
RL = 500Ω
Min.(2)
Max.
Min.(2)
Max.
1.5
1.5
1.5
1.5
1.5
7.5
1.5
1.5
1.5
1.5
1.5
4.6
1.5
1.5
1.5
1.5
1.5
4.9
6.5
6
1.5
1.5
1.5
1.5
1.5
4.1
5.8
4.8
5.8
4.8
ns
ns
ns
ns
ns
tPHL
tPZH
tPZL
OutputEnableTime
10
10
10
10
6.2
5
OE to A or B
tPHZ
tPLZ
OutputDisableTime
OE to A or B
tPZH
tPZL
OutputEnableTime
T/R to A or B(3)
6.2
5
6.5
6
tPHZ
tPLZ
OutputDisableTime
T/R to A or B(3)
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
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
TESTCIRCUITSANDWAVEFORMS
VCC
7.0V
SWITCHPOSITION
500Ω
Test
Switch
Closed
Open
VOUT
VIN
Open Drain
Disable Low
Enable Low
Pulse
Generator
D.U.T
.
50pF
All Other Tests
500Ω
RT
L
C
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Octal link
Test Circuits for All Outputs
3V
DATA
1.5V
0V
INPUT
LOW-HIGH-LOW
PULSE
tH
tSU
1.5V
1.5V
3V
1.5V
0V
TIMING
INPUT
tW
ASYNCHRONOUS CONTROL
tREM
PRESET
3V
1.5V
0V
CLEAR
HIGH-LOW-HIGH
PULSE
ETC.
SYNCHRONOUS CONTROL
PRESET
3V
Octal link
1.5V
0V
CLEAR
tSU
tH
CLOCK ENABLE
ETC.
Pulse Width
Octal link
Set-Up, Hold, and Release Times
ENABLE
DISABLE
3V
1.5V
0V
3V
SAME PHASE
CONTROL
INPUT
1.5V
0V
INPUT TRANSITION
tPLH
tPLH
tPHL
tPHL
tPZL
tPLZ
VOH
1.5V
VOL
OUTPUT
3.5V
1.5V
3.5V
VOL
VOH
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
0.3V
0.3V
3V
1.5V
0V
tPZH
tPHZ
OPPOSITE PHASE
INPUT TRANSITION
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
1.5V
0V
Octal link
0V
Octal link
Propagation Delay
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; ZO ≤ 50Ω; tF ≤ 2.5ns; tR ≤ 2.5ns.
6
IDT54/74FCT245/A/C
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
MILITARYANDCOMMERCIAL TEMPERATURERANGES
ORDERINGINFORMATION
IDT
XX
FCT
XXXX
XX
X
Temp. Range
Package
Process
Device Type
Blank
B
Commercial
MIL-STD-883, Class B
Commercial Options
Small Outline IC
SO
Military Options
CERDIP
Leadless Chip Carrier
D
L
Octal Bidirectional Transceiver
245
245A
245C
54
74
– 55°C to +125°C
0°C to +70°C
CORPORATE HEADQUARTERS
2975StenderWay
Santa Clara, CA 95054
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
for Tech Support:
logichelp@idt.com
(408) 654-6459
www.idt.com
7
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