IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER INDUSTRIAL TEMPERATURE RANGE HIGH-SPEED CMOS 8-BIT TRANSCEIVER IDTQS74FCT2245T/AT/CT DESCRIPTION: FEATURES: 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 25Ω 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. • • • • • • 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 Ω series resistor outputs reduce reflection and other Built-in 25Ω system noise • Std., A, and C speed grades with 4.1ns tPD for C • IOL = 12mA • Available in SOIC and QSOP packages FUNCTIONAL BLOCK DIAGRAM T/R OE 25Ω Ax 25Ω Bx The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE DECEMBER 2000 1 © 2000 Integrated Device Technology, Inc. DSC-5404/3 IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION Symbol Description Max Unit VTERM Terminal Voltage with Respect to GND –0.5 to +7 V Storage Temperature –65 to +150 °C T/R 1 20 VCC TSTG IOUT DC Output Current Max Current Sink/Pin +120 mA A0 2 19 OE IIK Input Diode Current, VIN < 0 -20 mA A1 3 18 B0 IOK DC Output Current, VOUT < 0 -50 mA A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 GND 10 11 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 = +25°C, F = 1.0MHz) Parameter(1) Symbol B7 Conditions Typ. Max. CIN Input Capacitance VIN = 0V 4 — Unit pF COUT Output Capacitance VOUT = 0V 8 — pF NOTE: 1. This parameter is measured at characterization but not tested. SOIC/ QSOP TOP VIEW PIN DESCRIPTION Pin Names I/O Description Ax I/O Data Bus A Bx I/O Data Bus B T/R I Direction OE I Output Enable Input (Active LOW) FUNCTION TABLE(1) OE T/R H X Z Z Disable L L Output Input Bus B to Bus A L H Input Output Bus A to Bus B NOTE: 1. H = HIGH Voltage Level X = Don’t Care L = LOW Voltage Level Z = High-Impedance 2 A B Function 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 = –40°C to +85°C, VCC = 5.0V ±5% Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit VIH Input HIGH Level Guaranteed Logic HIGH Level 2 — — V VIL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V ∆VT Input Hysteresis VTLH - VTHL for all inputs IIH Input HIGH Current VCC = Max. IIL Input LOW Current IOZ Off-State Output Current (Hi-Z) IOR Current Drive VCC = Max. VCC = Max., VOUT = — 0.2 — V 0 ≤ VIN ≤ VCC — — ±5 µA 0 ≤ VIN ≤ VCC — — ±5 µA 50 — — mA 2V(2) 25°C(2) VIC Input Clamp Voltage VCC = Min., IIN = –18mA, TA = — –0.7 –1.2 V VOH Output HIGH Voltage VCC = Min. IOH = –15mA 2.4 — — V VOL ROUT Output LOW Voltage Output Resistance VCC = Min. VCC = Min. IOL = 12mA IOL = 12mA — 20 — 28 0.5 40 V Ω Min. Max. Unit — 1.5 mA NOTES: 1. Typical values are at VCC = 5.0V, +25°C ambient. 2. This parameter is guaranteed but not tested. POWER SUPPLY CHARACTERISTICS Symbol Parameter ICC 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 — 2 mA ICCD Supply Current per Input per MHz VCC = Max. Outputs Open and Enabled One Bit Toggling 50% Duty Cycle — 0.25 mA/ MHz 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. 3 IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER INDUSTRIAL TEMPERATURE RANGE SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1) 74FCT2245T Symbol 74FCT2245AT 74FCT2245CT Parameter Min. Max. Min. Max. Min. Max. Unit tPLH Propagation Delay 1.5 7 1.5 4.6 1.5 4.1 ns tPHL Ax to/from Bx tPZH Output Enable Time 1.5 9.5 1.5 6.2 1.5 5.8 ns tPZL OE, T/R to A/B tPHZ Output Disable Time(3) 1.5 7.5 1.5 5 1.5 4.5 ns tPLZ OE, T/R to A/B (2) NOTES: 1. CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted. 2. Minimums guaranteed but not tested. 3. This parameter is guaranteed by design but not tested. 4 IDTQS74FCT2245T/AT/CT HIGH-SPEED CMOS 8-BIT TRANSCEIVER INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS VCC SWITCH POSITION 7.0V 500Ω Pulse Generator VOUT VIN D.U.T. 50pF RT 500Ω Test Switch Open Drain Disable Low Enable Low Closed All Other Tests Open DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. CL FCTL link Test Circuits for All Outputs DATA INPUT tH tSU TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. 3V 1.5V 0V 3V 1.5V 0V tREM tSU LOW-HIGH-LOW PULSE 1.5V tW 3V 1.5V 0V HIGH-LOW-HIGH PULSE 3V 1.5V 0V tH 1.5V FCTL link Pulse Width FCTL link Set-Up, Hold, and Release Times ENABLE SAME PHASE INPUT TRANSITION tPLH tPHL OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL 3V 1.5V 0V DISABLE 3V 1.5V CONTROL INPUT OUTPUT NORMALLY LOW 3V 1.5V 0V OUTPUT NORMALLY HIGH FCTL link SWITCH CLOSED tPZH SWITCH OPEN 0V tPLZ tPZL VOH 1.5V VOL 3.5V 3.5V 1.5V 0.3V VOL tPHZ 0.3V VOH 1.5V 0V 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. 5 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 CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 –40°C to +85°C for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 6 for Tech Support: [email protected] (408) 654-6459