IDT74FST3244 OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE OCTAL BUS SWITCH IDT74FST3244 FEATURES: DESCRIPTION: − − − − − The FST3244 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 or 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. − − − Bus switches provide zero delay paths Extended commercial range of –40°C to +85°C Low switch on-resistance 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, SOIC, SSOP, TSSOP, and PDIP Packages Hot insertion capability Very low power dissipation 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 FST3244 is an octal TTL-compatible bus switch. The OE pins provide output enable control for all 8 bits. This device is pin-compatible with and functionally similar to the FCT244T. PIN CONFIGURATION FUNCTIONAL BLOCK DIAGRAM 1 OE 1 OE 1 20 Vcc 1A 0 1B 0 1A 0 2 19 2 OE 1A 1 1B 1 2B 3 3 18 1B 0 1A 2 1B 2 1A 1 4 17 2A 3 1A 3 1B 3 2B 2 5 16 1B 1 1A 2 6 15 2A 2 2B 1 7 14 1B 2 1A 3 8 13 2A 1 2B 0 9 12 1B 3 10 11 2A 0 2 OE 2A 0 2B 0 2A 1 2B 1 GND 2A 2 2B 2 2A 3 2B 3 P20-1 SO20-2 SO20-8 SO20-9 SO20-7 QSOP/ SOIC/ SSOP/ TSSOP/ PDIP TOP VIEW INDUSTRIAL TEMPERATURE RANGE OCTOBER 1999 1 c 1999 Integrated Device Technology, Inc. DSC-5522/- IDT74FST3244 OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) Symbol PIN DESCRIPTION Rating Max. Unit VTERM(2) Terminal Voltage with Respect to GND –0.5 to +7 V Pin Names xOE TSTG Storage Temperature –65 to +150 °C xAx A Port Bits IOUT Maximum Continuous Channel Current 128 mA xBx B Port Bits Description Output Enable Inputs (Active LOW) FST LINK 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 CAPACITANCE (1) Symbol Parameter CIN Control Input Capacitance CI/O Conditions(2) Switch Input/Output Capacitance Switch Off Typ. 8 Unit 13 pF (1) 1OE 2OE H H Disconnect Description L H Connect 1A to 1B H L Connect 2A to 2B L L Connect 1A to 1B and 2A to 2B NOTE: 1. H = HIGH L = LOW 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: Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5% Typ.(1) — Max. — — — 0.8 V — — ±1 µA — — ±1 — — ±1 — — ±1 VCC = Min., IIN = –18mA — –0.7 –1.2 V Switch Power Off Leakage VCC = 0V, VIN or VO ≤ 5.5V — — ±1 µA Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.1 3 µA Symbol VIH Parameter Control Input HIGH Voltage Test Conditions Guaranteed Logic HIGH Level VIL Control Input LOW Voltage Guaranteed Logic LOW Level IIH Control Input HIGH Current VCC = Max. VI = VCC IIL Control Input LOW Current VI = GND IOZH Current during IOZL Bus Switch DISCONNECT VIK Clamp Diode Voltage IOFF ICC VCC = Max., VO = 0 to 5V Min. 2 Unit V µA BUS SWITCH IMPEDANCE OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5% Symbol RON IOS Parameter Switch CONNECT Resistance, A to B(2) Short Circuit Current, A to B(3) Test Conditions Vcc = Min., VIN = 0V ION = 30mA Vcc = Min., VIN = 2.4V ION = 15mA A(B) = 0V, B(A) = VCC NOTES: 1. Typical values are at Vcc = 5.0V, +25°C ambient. 2. The voltage drop between the indicated ports divided by the current through the switch. 3. Not more than one output should be shorted at one time. Duration of the test should not esceed one second. 2 Min. — Typ.(1) 5 Max. 7 — 10 15 100 — — Unit Ω mA IDT74FST3244 OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ∆ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) IC Total Power Supply Current(6) Test Conditions(1) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open 1 Enable Pin Toggling 50% Duty Cycle VCC = Max. Outputs Open 2 Enable Pins Toggling fi = 10MHz 50% Duty Cycle Min. — Typ.(2) 0.5 Max. 1.5 Unit mA VIN = VCC VIN = GND — 120 160 µ A/ MHz/ Enable VIN = VCC VIN = GND — 2.4 3.2 mA VIN = 3.4 VIN = GND — 2.9 4.7 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 = 3.3V, +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. CPD = ICCD/VCC CPD = Power Dissipation Capacitance 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) fi = Input Frequency N = Number of Switches Toggling at fi All currents are in milliamps and all frequencies are in megahertz. SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5% Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description Data Propagation Delay A to B, B to A(2) Switch CONNECT Delay xOE to A or B Switch DISCONNECT Delay xOE to A or B Charge Injection During Switch DISCONNECT, xOE to A or B(3) Min.(2) — Typ. — Max. 0.25 Unit ns 1.5 — 6.5 ns 1.5 — 5.5 ns — 1.5 — pC NOTES: 1. See test circuit and waveforms. 2. The bus switch contributes no propagation delay other than the RC delay of the load interacting with the RC of the switch. 3. IQCII is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. IQDCII is the charge injection for a multiplexer as the multiplexed port switches from one path to another. Charge Injection is reduced becasue the injection from the DISCONNECT of the first path is compensated by the CONNECT of the second path. 3 IDT74FST3244 OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS PROPAGATION DELAY TEST CIRCUITS FOR ALL OUTPUTS V CC 7.0V 500 Ω tPL H V O UT V IN Pulse Generator tPH L VOH 1.5V VOL OUTPUT D.U.T. tPL H 50pF RT 3V 1.5V 0V SAME PHASE INPUT TRANSITION C 500 Ω tPH L 3V 1.5V 0V OPPOSITE P HASE INPUT TRANSITION L SET-UP, HOLD, AND RELEASE TIMES SWITCH POSITION Test Switch Disable Low tH t SU Closed TIMING INPUT Enable Low All Other Tests 3V 1.5V 0V 3V 1.5V 0V DATA INPUT Open Drain Open t REM ASYNCHRONOUS CONTROL FCT LINK DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. SYNCHRONOUS CONTROL t SU 3V 1.5V 0V 3V 1.5V 0V tH CHARGE INJECTION VCC ENABLE AND DISABLE TIMES ENABLE 1 M Hz Signal G enerator Enable/Select (1 ) D.U.T. Switch O ut 3V V O U T(3 ) CONTROL INPUT Switch In (2 ) Switch In (M UX) DISABLE 1.5V t PZL CL = 50pF OUTPUT NORMALLY LOW SW ITCH CLOSED NOTES: 1. Select is used with multiplexers for measuring IQDCII during multiplexer select. During all other tests Enable is used. 2. Used with multiplexers to measure IQDCII only. 3. Charge Injection = ∆VOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII. ∆VOUT is the change in VOUT and is measured with a 10MΩ probe. 0.3V 1.5V tW HIGH-LOW -HIGH PULSE VOL tPHZ 0.3V VOH 1.5V 0V 0V NOTES: 1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH 2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns PULSE WIDTH LOW -HIGH-LOW PULSE SW ITCH OPEN 3.5V 3.5V 1.5V tPZH OUTPUT NORMALLY HIGH 0V tPLZ 1.5V 4 IDT74FST3244 OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX Tem p. Range FST X XX X Fam ily Device Type Package PY P SO Q PG Shrink Small Outline Package (SO20-7) Plastic DIP (P20-1) Sm all O utline IC (SO20-2) Quarter-size Sm all O utline Package (SO20-8) Thin Shrink Small Outline Package (SO20-9) 244 8-Bit Switch 3 Octal Bus Switch 74 − 40 ° C to +85 ° C CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com* *To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2. The IDT logo is a registered trademark of Integrated Device Technology, Inc. 5