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IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
HIGH-SPEED CMOS 8-BIT TRANSCEIVER
IDTQS74FCT2245T/AT/CT
CMOS power levels: <7.5mW static Undershoot clamp diodes on all inputs True TTL input and output compatibility Ground bounce controlled outputs Reduced output swing of 0 to 3.5V Built-in 25 series resistor outputs reduce reflection and other system noise * Std., A, and C speed grades with 4.1ns tPD for C * IOL = 12mA * Available in SOIC and QSOP packages
FEATURES:
* * * * * *
DESCRIPTION:
The IDTQS74FCT2245T is an 8-bit non-inverting transceiver that has three-state outputs, ideal 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 QS74FCT2245 has a 25 resistor output that is useful for driving transmission lines and reducing system noise. The QS74FCT2245 parts can replace the 245 series to reduce noise in an existing design. All inputs have clamp diodes for undershoot noise suppression. All outputs have ground bounce suppression. Outputs will not load an active bus when Vcc is removed from the device.
FUNCTIONAL BLOCK DIAGRAM
T/R
OE 25 Ax 25 Bx
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
DECEMBER 2000
DSC-5404/3
(c) 2000 Integrated Device Technology, Inc.
IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
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 VCC OE B0 B1 B2 B3 B4 B5 B6 B7
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM TSTG IOUT IIK IOK Description Terminal Voltage with Respect to GND Storage Temperature DC Output Current Max Current Sink/Pin Input Diode Current, VIN < 0 DC Output Current, VOUT < 0 Max -0.5 to +7 -65 to +150 +120 -20 -50 Unit V C mA mA mA
NOTE: 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.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 4 8 Max. -- -- Unit pF pF
NOTE: 1. This parameter is measured at characterization but not tested.
SOIC/ QSOP TOP VIEW
PIN DESCRIPTION
Pin Names Ax Bx T/R OE I/O I/O I/O I I Data Bus A Data Bus B Direction Output Enable Input (Active LOW) Description
FUNCTION TABLE(1)
OE H L L T/R X L H A Z Output Input B Z Input Output Function Disable Bus B to Bus A Bus A to Bus B
NOTE: 1. H = HIGH Voltage Level X = Don't Care L = LOW Voltage Level Z = High-Impedance
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IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5%
Symbol VIH VIL VT IIH IIL IOZ IOR VIC VOH VOL ROUT Parameter Input HIGH Level Input LOW Level Input Hysteresis Input HIGH Current Input LOW Current Off-State Output Current (Hi-Z) Current Drive Input Clamp Voltage Output HIGH Voltage Output LOW Voltage Output Resistance VCC = Max. VCC = Max., VOUT = VCC = Min. VCC = Min. VCC = Min. 2V(2) 25C(2) IOH = -15mA IOL = 12mA IOL = 12mA VCC = Min., IIN = -18mA, TA = 0 VIN VCC -- 50 -- 2.4 -- 20 -- -- -0.7 -- -- 28 5 -- -1.2 -- 0.5 40 A mA V V V Test Conditions Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VTLH - VTHL for all inputs VCC = Max. 0 VIN VCC Min. 2 -- -- -- Typ.(1) -- -- 0.2 -- Max. -- 0.8 -- 5 Unit V V V A
NOTES: 1. Typical values are at VCC = 5.0V, +25C ambient. 2. This parameter is guaranteed but not tested.
POWER SUPPLY CHARACTERISTICS
Symbol ICC Parameter Quiescent Power Supply Current Test Conditions(1) VCC = Max. freq = 0 0V VIN 0.2V or VCC - 0.2V VIN VCC ICC Supply Current per Input TTL Inputs HIGH VCC = Max. VIN = 3.4V(2) freq = 0 VCC = Max. Outputs Open and Enabled One Bit Toggling 50% Duty Cycle Other inputs at GND or VCC(3,4)
NOTES: 1. For conditions shown as Min. or Max., use appropriate value specified under DC Electrical Characteristics. 2. Per TTL driven input (VIN = 3.4V). 3. For flip-flops, ICCD 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. 4. 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 Output Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fi = Output Frequency Ni = Number of Outputs at fi All currents are in milliamps and all frequencies are in megahertz.
Min. --
Max. 1.5
Unit mA
--
2
mA
ICCD
Supply Current per Input per MHz
--
0.25
mA/ MHz
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IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)
74FCT2245T Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter
(2)
74FCT2245AT Min. 1.5 1.5 1.5 Max. 4.6 6.2 5 7
74FCT2245CT Min. 1.5 1.5 1.5 Max. 4.1 5.8 4.5 Unit ns
Min. 1.5 1.5 1.5
Max.
Propagation Delay Ax to/from Bx Output Enable Time OE, T/R to A/B Output Disable Time(3) OE, T/R to A/B
9.5 7.5
ns
ns
NOTES: 1. CLOAD = 50pF, RLOAD = 500 unless otherwise noted. 2. Minimums guaranteed but not tested. 3. This parameter is guaranteed by design but not tested.
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IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
VCC 500 Pulse Generator VIN D.U.T. 50pF RT CL 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
FCTL link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
FCTL link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
FCTL link
1.5V
1.5V
tSU
tH
Pulse Width
Set-Up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
FCTL link
DISABLE 3V 1.5V
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPHZ 0.3V 1.5V 0V tPLZ
0V 3.5V 0.3V VOL VOH 0V
FCTL 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; tF 2.5ns; tR 2.5ns.
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IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XX FCT XXXX Device Type Temp. Range XX Package
SO Q
Small Outline IC (gull wing) Quarter Size Small Outline Package
High-Speed CMOS 8-Bit Transceiver 2245T 2245AT 2245CT 74 -40C to +85C
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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