1CY74FCT2257T Data sheet acquired from Cypress Semiconductor Corporation. Data sheet modified to remove devices not offered. CY74FCT2257T Quad 2-Input Multiplexer SCCS038 - September 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 4.3 ns max., FCT-A speed at 5.0 ns max. • TTL output level versions of equivalent FCT functions • 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 current15 mA • Extended commercial temp. range of –40˚C to +85˚C • Three-state outputs The FCT2257T has four identical two-input multiplexers that select four bits of data from two sources under the control of a common data Select input (S). The I0 inputs are selected when the Select input is LOW and the I1 inputs are selected when the Select input is HIGH. Data appears at the output in true non-inverted form for the FCT2257T. On-chip termination resistors have been added to the outputs to reduce system noise caused by reflections. The FCT2257T can be used to replace the FCT257T to reduce noise in an existing design. The FCT2257T is a logic implementation of a four-pole, two-position switch where the position of the switch is determined by the logic levels supplied to the select input. Outputs are forced to a high-impedance “OFF” state when the Output Enable input (OE) is HIGH. All but one device must be in the high-impedance state to avoid currents exceeding the maximum ratings if outputs are tied together. Design of the output enable signals must ensure that there is no overlap when outputs of three-state devices are tied together. The outputs are designed with a power-off disable feature to allow for live insertion of boards. Pin Configurations Logic Block Diagram I1a I0a I0b I1b I0c I1c I0d I1d S SOIC/QSOP Top View OE S 1 16 VCC I0a 2 15 I1a 3 14 OE I0c Ya 4 13 I1c I0b 5 12 I1b 6 11 Yc I0d Yb 7 10 I1d 8 9 Yd GND FCT2257T–3 Ya Yb Yc Yd FCT2257T–1 Function Table[1] Pin Description Name Inputs Description I Data Inputs S Common Select Input OE Enable Inputs (Active LOW) Y Data Outputs Output OE S I0 I1 Y H L L L L X H H L L X X X L H X L H X X Z L H L H Note: 1. H = HIGH Voltage Level, L = LOW Voltage Level, X = Don’t Care, Z = High impedance (OFF) state. Copyright © 2000, Texas Instruments Incorporated CY74FCT2257T 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 Operating Range Ambient Temperature with Power Applied .............................................–65°C to +135°C Supply Voltage to Ground Potential ............... –0.5V to +7.0V Range DC Input Voltage............................................ –0.5V to +7.0V Commercial Ambient Temperature VCC –40°C to +85°C 5V ± 5% 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 VOL Output LOW Voltage VCC=Min., IOL=12 mA ROUT Output Resistance VCC=Min., IOL=12 mA 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 IIH Input HIGH Current VCC=Max., VIN=2.7V IIL Input LOW Current IOZH Off State HIGH-Level Output Current IOZL 20 Max. Unit V 0.3 0.55 V 25 40 Ω 2.0 V 0.8 V V –1.2 V ±1 µA VCC=Max., VIN=0.5V ±1 µA VCC=Max., VOUT=2.7V 10 µA Off State LOW-Level Output Current VCC=Max., VOUT=0.5V –10 µA IOS Output Short Circuit Current[7] VCC=Max., VOUT=0.0V –225 mA IOFF Power-Off Disable VCC=0V, VOUT=4.5V ±1 µA Typ.[5] –60 –120 Capacitance[6] Parameter Description Test Conditions Max. Unit 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 CY74FCT2257T 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, 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, 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, OE=GND, VIN=3.4V or VIN=GND 1.0 2.4 mA VCC=Max., 50% Duty Cycle, Outputs Open, Four Bits Toggling at f1=2.5 MHz, OE=GND, VIN < 0.2V or VIN > VCC–0.2V 0.7 1.4[11] mA VCC=Max., 50% Duty Cycle, Outputs Open, Four Bits Toggling at f1=2.5 MHz, OE=GND, VIN=3.4V or VIN=GND 1.7 5.4[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. 10. IC = IQUIESCENT + IINPUTS + IDYNAMIC 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) DH = Duty Cycle for TTL inputs HIGH NT = Number of TTL inputs at DH ICCD = Dynamic Current caused by an input transition pair (HLH or LHL) f0 = Clock frequency for registered devices, otherwise zero f1 = Input signal frequency N1 = Number of inputs changing at f1 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 CY74FCT2257T Switching Characteristics Over the Operating Range[12] Parameter Description CY74FCT2257AT CY74FCT2257CT Commercial Commercial Min. Max. Min. Max. Unit Fig. No.[13] tPLH tPHL Propagation Delay Ia, Ib to Y 1.5 6.0 1.5 4.3 ns 1, 3 tPLH tPHL Propagation Delay S to O 1.5 10.5 1.5 5.2 ns 1, 3 tPZH tPZL Output Enable Time 1.5 8.5 1.5 6.0 ns 1, 7, 8 tPHZ tPLZ Output Disable Time 1.5 6.0 1.5 5.0 ns 1, 7, 8 Ordering Information Speed (ns) 4.3 5.0 Ordering Code Package Name Package Type CY74FCT2257CTQCT Q1 16-Lead (150-Mil) QSOP CY74FCT2257CTSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC CY74FCT2257ATQCT Q1 16-Lead (150-Mil) QSOP 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 CY74FCT2257T Package Diagrams 16-Lead Quarter Size Outline Q1 16-Lead Molded SOIC S1 5 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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