IDT74FST6800 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS FEATURES: IDT74FST6800 DESCRIPTION: • • • • Bus switches provide zero delay paths Ω Low switch on-resistance: 7Ω TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) • Available in QSOP and TSSOP packages The FST6800 belongs to IDT's family of Bus switches. Bus switch devices perform the function of connecting or isolating two ports without providing any inherent current sink or source capability. Thus they generate little or no noise of their own while providing a low resistance path for an external driver. These devices connect input and output ports through an n-channel FET. When the gate-to-source junction of this FET is adequately forwardbiased the device conducts and the resistance between input and output ports is small. Without adequate bias on the gate-to-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot insertion capability. The low on-resistance and simplicity of the connection between input and output ports reduces the delay in this path to close to zero. The FST6800 provides a 10-Bit TTL-compatible interface. The ON pin serves as the enable pin. When ON is high, A and B ports are isolated and B outputs are precharged to the BIASV voltage, through the equivalent of a 10KΩ resistor. FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION BIASV A1 A10 ON 1 24 VCC A1 2 23 B1 A2 3 22 B2 A3 4 21 B3 A4 5 20 B4 A5 6 19 B5 A6 7 18 B6 A7 8 17 B7 A8 9 16 B8 A9 10 15 B9 A10 11 14 B10 GND 12 13 BIASV B1 B10 ON QSOP/ TSSOP TOP VIEW The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE JANUARY 2004 1 © 2004 Integrated Device Technology, Inc. DSC-5519/2 IDT74FST6800 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS(1) Symbol Description Max Unit Pin Names I/O VTERM(2) Terminal Voltage with Respect to GND –0.5 to +7 V TSTG Storage Temperature –65 to +150 °C IOUT Maximum Continuous Channel Current 128 mA A1-10, B1-10 ON BIASV I/O I I NOTES: 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. 2. Vcc, Control, and Switch terminals. FUNCTION TABLE(1) ON CAPACITANCE(1) Symbol Conditions(2) Parameter CIN Control Input Capacitance CI/O Switch Input/Output Capacitance Typ. 4 Switch Off Description Buses A, B Bus Switch Enable (Active LOW) BIAS Voltage B1-10 Description L A1-10 Connect Unit H BIASV Precharge pF NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level pF NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V. DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = –40°C to +85°C, VCC = 5.0V ± 5%, BIASV = 0 to VCC Symbol Test Conditions(1) Parameter Min. Typ.(2) Max. Unit VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2 — — V VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V IIH Input HIGH Current VCC = Max. VI = VCC — — ±1 µA IIL Input LOW Current VI = GND — — ±1 IO Precharge Output Current VCC = Min., BIASV = 2.4V, VO = 0V 0.15 — — mA IOZH High Impedance Output Current VCC = Max. VO = VCC — — ±1 µA IOZL (3-State Output Pins) VO = GND — — ±1 IOS Short Circuit Current VCC = Min., VO = GND(3) — 300 — mA VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V RON Switch On Resistance VCC = 4.75V, VIN = 0.0V ION = 64mA — — 7 Ω VCC = 4.75V, VIN = 2.4V ION = 15mA — — 15 (4) IOFF Input/Output Power Off Leakage VCC = 0V, VIN or VO ≤ 4.5V — — 1 µA ICC Quiescent Power Supply Current VCC = Max., VI = GND or VCC — 0.1 3 µA NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25°C ambient. 3. Not more than one output should be tested at one time. Duration of the test should not exceed one second. 4. Measured by voltage drop between ports at indicated current through the switch. 2 IDT74FST6800 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Test Conditions(1) Symbol Parameter ∆ICC Quiescent Power Supply Current TTL Inputs HIGH VCC = Max. VIN = 3.4V(3) ICCD Dynamic Power Supply Current(4) VCC = Max., Outputs Open Enable Pin Toggling 50% Duty Cycle Total Power Supply Current(6) VCC = Max., Outputs Open Enable Pin Toggling (Ten Switches Toggling) fi = 10MHz 50% Duty Cycle IC Min. Typ.(2) Max. Unit — 0.5 1.5 mA VIN = VCC VIN = GND — 30 40 µA/ MHz/ Enable VIN = VCC VIN = GND — 3 4 mA VIN = 3.4V VIN = GND — 3.3 4.8 NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25°C ambient. 3. Per TTL driven input (VIN = 3.4V). All other inputs at VCC or GND. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. Values for these conditions are examples of Icc formula. These limits are guaranteed but not tested. 6. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ∆ICC DHNT + ICCD (fiN) 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 Input Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (zero for non-register devices) fi = Input Frequency N = Number of SwitchesToggling at fi All currents are in milliamps and all frequencies are in megahertz SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5% Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Description Condition(1) Min.(2) Typ. Max. Unit Data Propagation Delay Ax, Bx to Bx, Ax(3,4) Switch Turn On Delay ON to Ax, Bx Switch Turn Off Delay ON to Ax, Bx(3) CL = 50pF RL = 500Ω — — 0.25 ns 1.5 — 6.5 ns 1.5 — 5.5 ns NOTES: 1. See test circuit and waveforms. 2. Minimum limits guaranteed but not tested. 3. This parameter is guaranteed by design but not tested. 4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant for the switch alone is of the order of 0.25 ns for 50 pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side. 3 IDT74FST6800 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS V CC 7.0V SWITCH POSITION 500Ω V OUT VIN Pulse Generator D.U.T . 50pF RT 500Ω CL 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. Octal Link Test Circuits for All Outputs DATA INPUT tH tSU TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tREM tSU 3V 1.5V 0V 3V 1.5V 0V LOW-HIGH-LOW PULSE 1.5V tW 3V 1.5V 0V HIGH-LOW-HIGH PULSE 1.5V 3V 1.5V 0V tH Pulse Width Octal Link Octal 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 VOH 1.5V VOL DISABLE 3V 1.5V 0V CONTROL INPUT tPZL OUTPUT NORMALLY LOW 3V 1.5V 0V OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN tPLZ 3.5V 1.5V 3.5V 0.3V VOL tPHZ 0.3V 1.5V 0V Octal Link VOH 0V Octal 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. 4 IDT74FST6800 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX XX FST Temp. Range Device Type X Package CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 Q PG Quarter-size Small Outline Package Thin Shrink Small Outline Package 6800 10-Bit Bus Switch with Precharged Outputs 74 −40°C to +85°C for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 5 for Tech Support: [email protected] (408) 654-6459