QUALITY SEMICONDUCTOR, INC. High-Speed CMOS 8-Bit Tranceivers
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QS54/74FCT245T, 2245T
QUALITY SEMICONDUCTOR, INC.
High-Speed CMOS 8-Bit Tranceivers
DESCRIPTION
QS54/74FCT245T QS54/74FCT2245T
function compatible 74F245 74FCT245/645 74ABT245 Industrial temperature -40°C 85°C CMOS power levels: <7.5mW static Available DIP, SOIC, QSOP, ZIP, HQSOP Undershoot clamp diodes inputs TTL-compatible input output levels Ground bounce controlled outputs Reduced output swing 0-3.5V Military product compliant MIL-STD-883, Class FCT-T 245T JEDEC-FCT spec compatible Std., speed grades; 3.8ns 64mA Ind., 48mA Mil. FCT-T 2245T Built-in series resistor outputs reduce reflection other system noise Std., speed grades; 4.1ns 12mA Ind.
QSFCT245 QSFCT2245 8-bit noninverting transceivers that have three-state outputs which useful bus-oriented applications. Transmit/Receive (T/R) input determines direction data flow, either from Output Enable (OE) input enables selected port output. FCT2245 resistor output version useful driving transmission lines reducing system noise. 2245 parts replace series reduce noise existing design. inputs have clamp diode undershoot noise suppression. outputs have ground bounce suppression (see Application Note AN-001), outputs will load active when removed from device.
Figure Functional Block Diagram
FCT2245 Only
MDSL-00012-04 DECEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS54/74FCT245T, 2245T Figure Configurations (All Pins View)
PDIP, SOIC, QSOP, HQSOP
Table Description
Name Description Data Data Direction Output Enable
Table Function Table
Hi-Z Output Input Hi-Z Input Output Function Disable
QUALITY SEMICONDUCTOR, INC.
MDSL-00012-04 DECEMBER 1998
QS54/74FCT245T, 2245T Table Absolute Maximum Ratings
Supply Voltage Ground -0.5V 7.0V Output Voltage VOUT -0.5V 7.0V Input Voltage -0.5V 7.0V Input Voltage (for pulse width 20ns) -3.0V Input Diode Current with -20mA Output Diode Current with VOUT -50mA Output Current Max. Sink Current/Pin 120mA Maximum Power Dissipation watts TSTG Storage Temperature -65° 150°C
Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS cause permanent damage devices that result functional reliability type failures.
Table Capacitance(1)
25°C, 1MHz, VOUT Pins(2) 2-9, 11-18 SOIC QSOP PDIP Unit
Notes: Capacitance characterized tested. reference 20-pin package.
Table Power Supply Characteristics
Symbol
Parameter
Quiescent Power Supply Current
Test Conditions(1) Max., freq 0.2V VCC-0.2V Max., 3.4V, freq 0(2) Max., Outputs Open Enabled Toggling Duty Cycle Other Inputs VCC(3,4)
0.25
Unit
QCCD
Supply Current Input HIGH Supply Current Input
Notes: conditions shown Min. Max., appropriate values specified under specifications. driven input (VIN 3.4V). flip-flops, QCCD measured switching data input pins that output changes every clock cycle. This measurement device power consumption only does include power drive load capacitance tester capacitance. This parameter guaranteed design tested. computed using above parameters explained Technical Overview section.
MDSL-00012-04 DECEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS54/74FCT245T, 2245T Table Electrical Characteristics Over Operating Range
Industrial -40°C 85°C, 5.0V Symbol ROUT Parameter Input HIGH Voltage Input Voltage Input Hysteresis Input Current Input HIGH Off-State Output Current (Hi-Z) Short Circuit Current (FCT245) Current Drive (FCT2245 Input Clamp Voltage Output HIGH Voltage Output Voltage (FCT245) Output Voltage (FCT2245 Test Conditions Logic HIGH Inputs Logic Inputs VTLH VTHL Inputs Max., Max., Max., VOUT GND(2,3) Min., VOUT 2.0V(3) Min., -18mA, 25°C(3) Min. Min. Min. Min. -12mA (MIL) -15mA (IND) 48mA (MIL) 64mA (IND) 12mA (MIL) 12mA (IND) 12mA (MIL) 12mA (IND) Military -55°C 125°C, 5.0V ±10% Typ(1) -0.7 -1.2 Unit
0.55 0.55 0.50 0.50
Notes: Typical values indicate 5.0V 25°C. more than output should shorted duration second. These parameters guaranteed design tested.
Output Resistance (FCT2245
QUALITY SEMICONDUCTOR, INC.
MDSL-00012-04 DECEMBER 1998
QS54/74FCT245T, 2245T Table Switching Characteristics Over Operating Range
Industrial -40°C 85°C, 5.0V CLOAD 50pF, RLOAD unless otherwise noted. Military -55°C 125°C, 5.0V ±10%
2245 Symbol tPHL tPLH tPHL tPLH tPZH tPZL tPZH tPZL tPHZ tPLZ Description(1) Propagation Delay to/from (245) Propagation Delay to/from (2245) Output Enable Time (245) Output Enable Time (2245) Output Disable Time IND(2) MIL(2)
245A 2245A
245C 2245C
245D
Unit
Notes: Minimums guaranteed tested. This parameter guaranteed design tested. Test Circuit Waveforms.
MDSL-00012-04 DECEMBER 1998
QUALITY SEMICONDUCTOR, INC.
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