ETC QS74FCT2245ATP

QS54/74FCT245T, 2245T
Q
QUALITY
SEMICONDUCTOR, INC.
High-Speed CMOS
8-Bit
Tranceivers
QS54/74FCT245T
QS54/74FCT2245T
FEATURES/BENEFITS
DESCRIPTION
• Pin and function compatible to the 74F245
74FCT245/645 and 74ABT245
• Industrial temperature –40°C to 85°C
• CMOS power levels: <7.5mW static
• Available in DIP, SOIC, QSOP, ZIP, HQSOP
• Undershoot clamp diodes on all inputs
• TTL-compatible input and output levels
• Ground bounce controlled outputs
• Reduced output swing of 0-3.5V
• Military product compliant to MIL-STD-883,
Class B
The QSFCT245 and QSFCT2245 are 8-bit noninverting transceivers that have three-state outputs
which are useful for bus-oriented applications. The
Transmit/Receive (T/R) input determines the direction of data flow, either from A to B or B to A, and the
Output Enable (OE) input enables the selected port
for output. The FCT2245 is a 25Ω resistor output
version useful for driving transmission lines and
reducing system noise. The 2245 parts can replace
the 245 series to reduce noise in an existing design.
All inputs have clamp diode for undershoot noise
suppression. All outputs have ground bounce suppression (see QSI Application Note AN-001), and
outputs will not load an active bus when VCC is
removed from the device.
FCT-T 245T
• JEDEC-FCT spec compatible
• Std., A, C, and D speed grades; 3.8ns tPD for D
• IOL = 64mA Ind., 48mA Mil.
FCT-T 2245T
• Built-in 25Ω series resistor outputs reduce
reflection and other system noise
• Std., A, and C speed grades; 4.1ns tPD for C
• IOL = 12mA Ind.
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Figure 1. Functional Block Diagram
T/R
OE
25Ω
Ai
25Ω
Bi
FCT2245
Only
MDSL-00012-04
DECEMBER 28, 1998
QUALITY SEMICONDUCTOR, INC.
1
QS54/74FCT245T, 2245T
Figure 2. Pin Configurations (All Pins Top View)
PDIP, SOIC, QSOP, HQSOP
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ZIP
T/R
A1
A3
A5
A7
B7
B5
B3
B1
OE
VCC
OE
B0
B1
B2
B3
B4
B5
B6
B7
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
A0
A2
A4
A6
GND
B6
B4
B2
B0
VCC
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Table 1. Pin Description
Name
I/O
Description
Ai
I/O
Data Bus A
Bi
I/O
Data Bus B
T/R
I
Direction
OE
I
Output Enable
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No
Table 2. Function Table
2
OE
T/R
R
A
B
H
X
Hi-Z
Hi-Z
Disable
L
L
Output
Input
Bus B to Bus A
L
H
Input
Output
Bus A to Bus B
Function
QUALITY SEMICONDUCTOR, INC.
MDSL-00012-04
DECEMBER 28, 1998
QS54/74FCT245T, 2245T
Table 3. Absolute Maximum Ratings
Supply Voltage to Ground ................................................. –0.5V to 7.0V
DC Output Voltage VOUT ................................................... –0.5V to 7.0V
DC Input Voltage VIN ......................................................... –0.5V to 7.0V
AC Input Voltage (for a pulse width ≤ 20ns) ................................. –3.0V
DC Input Diode Current with VIN < 0 ........................................... –20mA
DC Output Diode Current with VOUT < 0 ..................................... –50mA
DC Output Current Max. Sink Current/Pin .................................. 120mA
Maximum Power Dissipation .................................................... 0.5 watts
TSTG Storage Temperature ............................................... –65° to 150°C
Note: Stresses greater than
those listed under ABSOLUTE
MAXIMUM RATINGS may
cause permanent damage to
QSI devices that result in functional or reliability type failures.
Table 4. Capacitance(1)
TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V
Pins(2)
SOIC
QSOP
PDIP
ZIP
1, 19
4
4
5
7
2-9, 11-18
8
8
9
10
Notes:
1. Capacitance is characterized but not tested.
2. Pin reference for 20-pin package.
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Unit
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Table 5. Power Supply Characteristics
No
Symbol
Parameter
Test Conditions(1)
Quiescent Power
Supply Current
∆ICC
QCCD
ICC
Min
Max
Unit
VCC = Max., freq = 0
0V ≤ VIN ≤ 0.2V or VCC-0.2V ≤ VIN ≤ VCC
—
1.5
mA
Supply Current per
Input @ TTL HIGH
VCC = Max., VIN = 3.4V, freq = 0(2)
—
2.0
mA
Supply Current per
Input per MHz
VCC = Max., Outputs Open and Enabled
One Bit Toggling @ 50% Duty Cycle
Other Inputs at GND or VCC(3,4)
—
0.25
mA/
MHz
Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Per TTL driven input (VIN = 3.4V).
3. For flip-flops, QCCD is measured by switching one of the data input pins so that the output changes every clock cycle.
This is a measurement of device power consumption only and does not include power to drive load capacitance or tester
capacitance. This parameter is guaranteed by design but not tested.
4. IC can be computed using the above parameters as explained in the Technical Overview section.
MDSL-00012-04
DECEMBER 28, 1998
QUALITY SEMICONDUCTOR, INC.
3
QS54/74FCT245T, 2245T
Table 6. DC Electrical Characteristics Over Operating Range
Industrial TA = –40°C to 85°C, VCC = 5.0V ±5%
Symbol
Military TA = –55°C to 125°C, VCC = 5.0V ±10%
Parameter
Test Conditions
Min
Typ(1)
Max
Unit
VIH
Input HIGH Voltage
Logic HIGH for All Inputs
2.0
—
—
V
VIL
Input LOW Voltage
Logic LOW for All Inputs
—
—
0.8
V
∆VT
Input Hysteresis
VTLH – VTHL for All Inputs
—
0.2
—
V
| IIH |
| IIL |
Input Current
Input HIGH or LOW
VCC = Max., 0 ≤ VIN < VCC
—
—
5
µA
| IOZ |
Off-State Output
Current (Hi-Z)
VCC = Max., 0 ≤ VIN ≤ VCC
—
—
5
µA
IOS
Short Circuit Current
(FCT245)
VCC = Max., VOUT = GND(2,3)
–60
—
—
mA
IOR
Current Drive
(FCT2245 – 25Ω)
VCC = Min., VOUT = 2.0V(3)
50
—
—
mA
VIC
Input Clamp Voltage
VCC = Min., IIN = –18mA, TA = 25°C(3)
—
–0.7
VOH
Output HIGH Voltage
VCC = Min.
IOH = –12mA (MIL)
IOH = –15mA (IND)
2.4
2.4
—
—
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VOL
Output LOW Voltage
(FCT245)
VCC = Min.
IOL = 48mA (MIL)
IOL = 64mA (IND)
—
—
VOL
Output LOW Voltage
(FCT2245 – 25Ω)
VCC = Min.
IOL = 12mA (MIL)
IOL = 12mA (IND)
ROUT
Output Resistance
(FCT2245 – 25Ω)
VCC = Min.
IOL = 12mA (MIL)
IOL = 12mA (IND)
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an
–1.2
V
—
—
V
—
—
0.55
0.55
V
—
—
—
—
0.50
0.50
V
—
20
25
28
—
40
Ω
mp
Co
Notes:
1. Typical values indicate VCC = 5.0V and TA = 25°C.
2. Not more than one output should be shorted and the duration is ≤1 second.
3. These parameters are guaranteed by design but not tested.
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QUALITY SEMICONDUCTOR, INC.
MDSL-00012-04
DECEMBER 28, 1998
QS54/74FCT245T, 2245T
Table 7. Switching Characteristics Over Operating Range
Industrial TA = –40°C to 85°C, VCC = 5.0V ±5%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Military TA = –55°C to 125°C, VCC = 5.0V ±10%
245
2245
Symbol
Description(1)
245A
2245A
245C
2245C
245D
Min Max Min
Max Min Max Min Max Unit
tPHL
tPLH
Propagation Delay
Ai to/from Bi (245)
IND
MIL
1.5
1.5
7
7.5
1.5
1.5
4.6
4.9
1.5
1.5
4.1
4.5
1.5
—
3.8
—
ns
tPHL
tPLH
Propagation Delay
Ai to/from Bi (2245)
IND
MIL
1.5
1.5
7
7.5
1.5
1.5
4.6
4.9
1.5
1.5
4.1
4.5
—
—
—
—
ns
tPZH
tPZL
Output Enable Time
OE, T/R to A/B (245)
IND
MIL
1.5
1.5
9.5
10
1.5
1.5
6.2
6.5
1.5
1.5
5.8
6.2
1.5
—
5.6
—
ns
tPZH
tPZL
Output Enable Time
OE, T/R to A/B (2245)
IND
MIL
1.5
1.5
9.5
10
1.5
1.5
6.2
6.5
1.5
1.5
5.8
6.2
—
—
—
—
ns
tPHZ
tPLZ
Output Disable Time
OE, T/R to A/B
IND(2)
MIL(2)
1.5
1.5
7.5
10
1.5
1.5
5
6
1.5
1.5
4.5
5.2
Notes:
1. Minimums guaranteed but not tested.
2. This parameter is guaranteed by design but not tested.
3. See Test Circuit and Waveforms.
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4.5
—
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MDSL-00012-04
DECEMBER 28, 1998
QUALITY SEMICONDUCTOR, INC.
5