Data sheet acquired from Cypress Semiconductor Corporation. Data sheet modified to remove devices not offered. CY74FCT2245T 8-Bit Transceiver SCCS037 - July 1994 - Revised March 2000 Features Functional Description • Function and pinout compatible with FCT and F logic • 25Ω output series resistors to reduce transmission line reflection noise • FCT-C speed at 4.1 ns max. FCT-A speed at 4.6 ns max. • Edge-rate control circuitry for significantly improved noise characteristics • Power-off disable feature • Fully compatible with TTL input and output logic levels • ESD > 2000V • Sink current 12 mA Source current 15 mA • Extended commercial temp. range of –40˚C to +85˚C • Three-state outputs Logic Block Diagram The FCT2245T contains eight non-inverting, bidirectional buffers with three-state outputs intended for bus oriented applications. On-chip termination resistors have been added to the outputs to reduce system noise caused by reflections. For this reason, the FCT2245T can be used in an existing design to replace the FCT245T. The FCT2245T current sinking capability is 12 mA at the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (Active HIGH) enables data from A ports to B ports; receive (Active LOW) enables data from B ports to A ports. The output enable (OE) input, when HIGH, disables both the A and B ports by putting them in a High Z condition. The outputs are designed with a power-off disable feature to allow for live insertion of boards. Pin Configurations T/R OE DIP/SOIC/QSOP Top View A0 B0 A1 B1 A2 B2 A3 B3 T/R 1 20 VCC A0 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 10 11 B7 GND A4 FCT2245T–3 B4 A5 B5 A6 B6 A7 B7 FCT2245T–1 Function Table[1] Inputs OE T/R Output L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State Note: 1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care. Copyright © 2000, Texas Instruments Incorporated CY74FCT2245T Maximum Ratings[2,3] DC Output Current (Maximum Sink Current/Pin) ...... 120 mA Power Dissipation .......................................................... 0.5W (Above which the useful life may be impaired. For user guidelines, not tested.) Static Discharge Voltage............................................>2001V (per MIL-STD-883, Method 3015) Storage Temperature .................................–65°C to +150°C Ambient Temperature with Power Applied .............................................–65°C to +135°C Operating Range Range Range Ambient Temperature VCC Commercial T, AT, CT –40°C to +85°C 5V ± 5% Supply Voltage to Ground Potential ............... –0.5V to +7.0V DC Input Voltage............................................ –0.5V to +7.0V DC Output Voltage ......................................... –0.5V to +7.0V Electrical Characteristics Over the Operating Range Parameter Description Test Conditions Min. Typ.[5] 2.4 3.3 VOH Output HIGH Voltage VCC=Min., IOH=–15 mA Com’l VOL Output LOW Voltage VCC=Min., IOL=12 mA Com’l ROUT Output Resistance VCC=Min., IOL=12 mA Com’l VIH Input HIGH Voltage VIL Input LOW Voltage VH Hysteresis[6] All inputs 0.2 VIK Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 II Input HIGH Current IIH 20 Max. Unit V 0.3 0.55 V 25 40 Ω 2.0 V 0.8 V V –1.2 V VCC=Max., VIN=VCC 5 µA Input HIGH Current VCC=Max., VIN=2.7V ±1 µA IIL Input LOW Current VCC=Max., VIN=0.5V IOS Output Short Circuit Current[7] VCC=Max., VOUT=0.0V IOFF Power-Off Disable VCC=0V, VOUT=4.5V –60 ±1 µA –225 mA ±1 µA Typ.[5] Max. Unit –120 Capacitance[6] Parameter Description Test Conditions CIN Input Capacitance 5 10 pF COUT Output Capacitance 9 12 pF Notes: 2. Unless otherwise noted, these limits are over the operating free-air temperature range. 3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground. 4. TA is the “instant on” case temperature. 5. Typical values are at VCC=5.0V, TA=+25˚C ambient. 6. This parameter is specified but not tested. 7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter tests, IOS tests should be performed last. 2 CY74FCT2245T Power Supply Characteristics Parameter Description Test Conditions Typ.[5] Max. Unit ICC Quiescent Power Supply Current VCC=Max., VIN < 0.2V, VIN > VCC–0.2V 0.1 0.2 mA ∆ICC Quiescent Power Supply Current (TTL inputs) VCC=Max., VIN=3.4V,[8] f1=0, Outputs Open 0.5 2.0 mA ICCD Dynamic Power Supply Current[9] VCC=Max., One Input Toggling, 50% Duty Cycle, Outputs Open, T/R=OE=GND, VIN < 0.2V or VIN > VCC–0.2V 0.06 0.12 mA/MHz IC Total Power Supply Current[10] VCC=Max., 50% Duty Cycle, Outputs Open, One Bit Toggling at f1=10 MHz, T/R=OE=GND, VIN < 0.2V or VIN > VCC–0.2V 0.7 1.4 mA VCC=Max., 50% Duty Cycle, Outputs Open, One Bit Toggling at f1=10 MHz, T/R=OE=GND, VIN=3.4V or VIN=GND 1.0 2.4 mA VCC=Max., 50% Duty Cycle, Outputs Open, Eight Bits Toggling at f1=2.5 MHz, T/R=OE=GND, VIN < 0.2V or VIN > VCC–0.2V 1.3 2.6[11] mA VCC=Max., 50% Duty Cycle, Outputs Open, Eight Bits Toggling at f1=2.5 MHz, T/R=OE=GND, VIN=3.4V or VIN=GND 3.3 10.6[11] mA Notes: 8. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND. 9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations. = IQUIESCENT + IINPUTS + IDYNAMIC 10. IC IC = ICC+∆ICCDHNT+ICCD(f0/2 + f1N1) ICC = Quiescent Current with CMOS input levels ∆ICC = Power Supply Current for a TTL HIGH input (VIN=3.4V) = Duty Cycle for TTL inputs HIGH DH = Number of TTL inputs at DH NT ICCD = Dynamic Current caused by an input transition pair (HLH or LHL) = Clock frequency for registered devices, otherwise zero f0 = Input signal frequency f1 = Number of inputs changing at f1 N1 All currents are in milliamps and all frequencies are in megahertz. 11. Values for these conditions are examples of the ICC formula. These limits are specified but not tested. 3 CY74FCT2245T ] Switching Characteristics—Over the Operating Range[12] Parameter Description FCT2245T FCT2245AT FCT2245CT Commercial Commercial Commercial Min. Max. Min. Max. Min. Max. Unit Fig. No.[13] tPLH tPHL Propagation Delay An to Bn or Bn to An 1.5 7.0 1.5 4.6 1.5 4.1 ns 1, 3 tPZH tPZL Output Enable Time 1.5 9.5 1.5 6.2 1.5 5.8 ns 1, 7, 8 tPHZ tPLZ Output Disable Time 1.5 7.5 1.5 5.0 1.5 4.5 ns 1, 7, 8 Ordering Information—FCT2245T Speed (ns) 4.1 4.6 7.5 Ordering Code Package Name Package Type CY74FCT2245CTQCT Q5 20-Lead (150-Mil) QSOP CY74FCT2245CTSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC CY74FCT2245ATPC P5 20-Lead (300-Mil) Molded DIP CY74FCT2245ATQCT Q5 20-Lead (150-Mil) QSOP CY74FCT2245ATSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC CY74FCT2245TQCT Q5 20-Lead (150-Mil) QSOP CY74FCT2245TSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC Notes: 12. Minimum limits are specified but not tested on Propagation Delays. 13. See “Parameter Measurement Information” in the General Information section. 4 Operating Range Commercial Commercial Commercial CY74FCT2245T Package Diagrams 20-Lead (300-Mil) Molded DIP P5 20-Lead Quarter Size Outline Q5 5 CY74FCT2245T Package Diagrams (continued) 20-Lead (300-Mil) Molded SOIC S5 6 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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