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| IDT74CBTLV3245 LOW-VOLTAGE OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE LOW-VOLTAGE OCTAL BUS SWITCH IDT74CBTLV3245 FEATURES: - - - - - - - - Pin-out compatible with standard '245 logic 5 A/B bidirectional switch Isolation Under Power-Off Conditions Over-voltage tolerant Latch-up performance exceeds 100mA VCC = 2.3V - 3.6V, Normal Range ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) Available in SSOP, QSOP, and TSSOP packages DESCRIPTION: The octal bus switch has standard 245 pinouts. The CBTLV3245 is designed for asynchronous communication between data buses. When Output Enable (OE) is low, the 8-bit bus switch is on and port A is connected to Port B. When OE is high, the switch is off and a high impedance exists between Port A and Port B. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor. APPLICATIONS: - 3.3V High Speed Bus Switching and Bus Isolation FUNCTIONAL BLOCK DIAGRAM 2 A1 SW 18 B1 A 9 A8 SW 11 B8 B 19 OE OE The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE 1 c 2001 Integrated Device Technology, Inc. JANUARY 2001 DSC-5170/- IDT74CBTLV3245 LOW-VOLTAGE OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Symbol VCC VI Description Supply Voltage Range Input Voltage Range Continuous Channel Current IIK TSTG Input Clamp Current, , VI/O < 0 Storage Temperature Max. -0.5 to 4.6 -0.5 to 4.6 128 -50 (1) Unit V V mA mA C NC A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 SO20-7 SO20-8 SO20-9 20 19 18 17 16 15 14 13 12 11 VCC OE B1 B2 B3 B4 B5 B6 B7 B8 -65 to +150 NOTE: 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. PIN DESCRIPTION Pin Names OE Ax Bx Description Output Enable (Active LOW) Port A Inputs or Outputs Port B Inputs or Outputs SSOP/ TSSOP/ QSOP TOP VIEW FUNCTION TABLE Input OE L H NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level (1) Operation A Port = B Port Isolation OPERATING CHARACTERISTICS, TA = 25C Symbol VCC VIH VIL TA Parameter Supply Voltage High-Level Control Input Voltage Low-Level Control Input Voltage Operating Free-Air Temperature VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V Test Conditions Min. 2.3 1.7 2 -- -- -40 Max. 3.6 -- -- 0.7 0.8 +85 C V Unit V V NOTE: 1. All unused control inputs must be held at VCC or GND to ensure proper device operation. 2 IDT74CBTLV3245 LOW-VOLTAGE OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Operating Condition: TA = - 40C to +85C Symbol VIK II IOZ IOFF ICC ICC (2) CI CIO(OFF) Max at VCC = 2.3V Typ at VCC = 2.5V RON (3) Parameter Control Inputs, Data Inputs Control Inputs, Data I/O Data I/O Test Conditions VCC = 3V, II = -18mA VCC = 3.6V, VI = VCC or GND VCC = 3.6V, VO = 0 or 3.6V, switch disabled VCC = 0, VI or VO = 0 to 3.6V VCC = 3.6V, IO = 0, VI = VCC or GND Min. -- -- -- -- -- -- -- -- Typ. (1) -- -- -- -- -- -- 4 6 5 5 27 5 5 10 Max. - 1.2 1 5 50 10 300 -- -- 8 8 40 7 7 15 Unit V A A A A A pF pF Control Inputs Control Inputs VCC = 3.6V, One input at 3V, Other inputs at VCC or GND VI = 3V or 0 VO = 3V or 0, OE = VCC VI = 0 VI = 1.7V VI = 0 IO = 64mA IO = 24mA IO = 15mA IO = 64mA IO = 24mA VI = 2.4V IO = 15mA -- -- -- -- -- -- VCC = 3V NOTES: 1. Typical values are at 3.3V, +25C ambient. 2. The increase in supply current is attributable to each input that is at the specified voltage level rather than VCC or GND. 3. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch. SWITCHING CHARACTERISTICS VCC = 2.5V 0.2V Symbol tPD(1) tEN tDIS Parameter Propagation Delay A to B or B to A Output Enable Time OE to A or B Output Disable Time OE to A or B Min. Max. 0.15 4.5 5 VCC = 3.3V 0.3V Min. Max. 0.25 4.2 5 Unit ns ns ns 1 1 1 1 NOTE: 1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the switch and the specified load capacitance when driven by an ideal voltage source (zero output impedance). 3 IDT74CBTLV3245 LOW-VOLTAGE OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 3.3V 0.3V 6 3 1.5 300 300 50 VCC(2)= 2.5V 0.2V 2 x Vcc Vcc VCC/2 150 150 30 Unit V V V mV mV pF OPPOSITE PHASE INPUT TRANSITION OUTPUT tPLH tPHL PROPAGATION DELAY SAME PHASE INPUT TRANSITION tPLH tPHL VIH VT 0V VOH VT VOL VIH VT 0V TEST CIRCUITS FOR ALL OUTPUTS VCC 500 Pulse Generator (1, 2) ENABLE AND DISABLE TIMES ENABLE DISABLE CONTROL INPUT tPZL OUTPUT SW ITCH NORMALLY CLO SED LOW tPZH OUTPUT SW ITCH NORMALLY OPE N HIGH VLOAD/2 VT tPHZ VT 0V tPLZ VIH VT 0V VLOAD/2 VOL + VLZ VOL VOH VOH -V HZ 0V VLOAD Open GND VIN D.U.T. VOUT RT 500 CL DEFINITIONS: 1. CL = Load capacitance: includes jig and probe capacitance. 2. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. NOTES: 1. Pulse Generator for all pulses: Rate 10MHz; tF 2.5ns; tR 2.5ns. 2. Pulse Generator for all pulses: Rate 10MHz; tF 2ns; tR 2ns. NOTE: 1. Diagram shown for input control Enable-LOW and input Control Disable-HIGH. SWITCH POSITION Test tPLZ/tPZL tPHZ/tPZH tPD Switch VLOAD GND Open 4 IDT74CBTLV3245 LOW-VOLTAGE OCTAL BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX CBTLV XXX Device Type XX Package Temp. Range PY Q PG Shrink Sm all Outline Package (SO20-7) Quarter-size Small Outline Package (SO20-8) Thin Shrink Small Outline Package (SO20-9) 3245 Low-Voltage Octal Bus Switch 74 -40C to +85C 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 for Tech Support: logichelp@idt.com (408) 654-6459 5 |
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