74FST32XL2384PAG

IDT74FST32XL2384 20-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE 20-BIT BUS SWITCH IDT74FST32XL2384 FEATURES: DESCRIPTION: • • • • The FST32XL2384 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 forward-biased the device conducts and the resistance between input and output ports is small. Without adequate bias on the gateto-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 FST32XL2384 is a 20-bit TTL-compatible bus switch. The BEx pins provide enable control. Bus switches provide zero delay paths Ω Low switch on-resistance; 28Ω TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) • Available in TSSOP package FUNCTIONAL BLOCK DIAGRAM A0 B0 A 10 B 10 A4 B4 A 14 B 14 A5 B5 A 15 B 15 A9 B9 A 19 B 19 BEA BED BEC BEB The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE March 2009 1 © 2004 Integrated Device Technology, Inc. DSC-4708/4 IDT74FST32XL2384 20-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS(1) BEA 1 48 Vcc B0 2 47 B19 A0 3 46 A19 A1 4 45 A18 B1 5 44 B18 B2 6 43 B17 A2 7 42 A17 A3 8 41 A16 Symbol Description Max Unit 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 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. CAPACITANCE(1) Symbol B3 9 40 B16 B4 10 39 B15 A4 11 38 A15 GND 12 37 BEB BEC 13 36 Vcc B5 14 35 A14 A5 15 34 B14 A6 16 33 A13 B6 17 32 B13 B7 18 31 B12 A7 19 30 A12 A8 20 29 A11 B8 21 28 B9 22 A9 GND Conditions(2) Parameter CIN Control Input Capacitance CI/O Switch Input/Output Capacitance Typ. Unit 4 pF 8 pF Switch Off NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V. PIN DESCRIPTION Pin Names I/O Description A0 - A19 I/O Bus A B0 - B19 I/O Bus B BEA I Enable, 0-4 BEB I Enable, 15-19 BEC I Enable, 5-9 BED I Enable, 10-14 FUNCTION TABLE(1) BEA BEB B 0 - B4 B15 - B19 Description B11 H H Z Z Disconnect 27 B10 L H A0 - A4 Z Connect H L Z A15 - A19 Connect 23 26 A10 L L A0 - A4 A15 - A19 Connect 24 25 BED BEC BED B0 - B 4 B15 - B19 Description H H Z Z Disconnect L H A5 - A9 Z Connect H L Z A10 - A14 Connect L L A5 - A 9 A10 - A14 Connect TSSOP TOP VIEW NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedance 2 IDT74FST32XL2384 20-BIT BUS SWITCH 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 ± 10% 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 VO = VCC — — ±1 VO = GND — — ±1 — 300 — IOZH High Impedance Output Current IOZL (3-State Output Pins) VCC = Max. IOS Short Circuit Current Vcc = Max., VO = GND(3) µA mA VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V RON Switch On Resistance(4) Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA 20 20 28 35 40 48 Ω 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 shorted 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. POWER SUPPLY CHARACTERISTICS Test Conditions(1) Symbol Parameter ΔICC Quiescent Power Supply Current TTL Inputs HIGH VCC = Max. VIN = 3.4V(3) ICCD Dynamic Power Supply Current(4,5) VCC = Max., Outputs Open Enable Pin Toggling 50% Duty Cycle Total Power Supply Current(6) VCC = Max., Outputs Open Enable Pins Toggling (20 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/ Switch VIN = VCC VIN = GND — 6 8 mA VIN = 3.4V VIN = GND — 7 11 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 the Icc formula. These limits are guaranteed but not tested. 6. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ΔICC DHNT + ICCD (fiN) ICC = Quiescent Current ΔICC = 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) fi = Control Input Frequency N = Number of Control Inputs Toggling at fi All currents are in milliamps and all frequencies are in megahertz. 3 IDT74FST32XL2384 20-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10% Description(1) Condition Min. Typ. Max. Unit tPLH tPHL Data Propagation Delay Ax to Bx, Bx to Ax(3,4) CL = 50pF RL = 500Ω — — 1.25 ns tPZH tPZL tPHZ tPLZ |QCI | Switch Turn On Delay BEx to Ax, Bx Switch Turn Off Delay BEx to Ax, Bx(3) Charge Injection(5,6) 1.5 — 7.5 ns 1.5 — 5.5 ns — 1.5 — pC Symbol 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 2.5ns for 50pF 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 on 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. 5. Measured at switch turn off, load = 50 pF in parallel with 10 MΩ scope probe, VIN = 0.0 volts. 6. Characterized parameter. Not 100% tested. 4 IDT74FST32XL2384 20-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS V CC SWITCH POSITION 7.0V 500Ω V OUT VIN Pulse Generator D.U.T . 50pF RT 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. 500Ω CL 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 Octal Link Pulse Width 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 DISABLE 3V CONTROL INPUT tPLZ tPZL VOH 1.5V VOL OUTPUT NORMALLY LOW 3V 1.5V 0V SWITCH CLOSED SWITCH OPEN 3.5V 3.5V 1.5V tPZH OUTPUT NORMALLY HIGH 1.5V 0V 0.3V VOL tPHZ 0.3V VOH 1.5V 0V Octal Link 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. 5 IDT74FST32XL2384 20-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION FST XXXXXXX XX Temp. Range Device Type XX Package CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 PA PAG Thin Shrink Small Outline Package TSSOP - Green 32XL2384 20-Bit Bus Switch 74 –40°C to +85°C for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 6 for Tech Support: logichelp@idt.com