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| FSTD3125 -- 4-Bit Bus Switch with Level Shifting March 2008 FSTD3125 -- 4-Bit Bus Switch with Level Shifting Features 4 Switch Connection between Two Ports Minimal Propagation Delay through the Switch Low ICC Zero Bounce in Flow-through Mode Control Inputs Compatible with TTL Level TruTranslation Voltage Translation from 5.0V Inputs to 3.3V Outputs Description Fairchild switch FSTD3125 provides four high-speed CMOS TTL-compatible bus switches. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. A diode to VCC has been integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs. The device is organized as four one-bit switches with separate /OE inputs. When /OE is LOW, the switch is ON and port A is connected to port B. When /OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Ordering Information Part Number FSTD3125MTC FSTD3125MTCX Operating Temperature Range -40 to 85C -40 to 85C Package 14-Lead, Thin Shrink Small Outline Package (TSSOP) JEDEC MO-153, 4mm Wide 14-Lead, Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4mm Wide Packing Method Tube Tape and Reel All packages are lead free per JEDEC: J-STD-020B standard. Technology Description The Fairchild switch family derives from and embodies Fairchild's proven switch technology used for several years in its 74LVX3L384 (FST3384) bus switch product. /OE1 1 1A 2 /OE2 4 3 1B 2A 5 6 2B /OE3 3A /OE4 10 9 13 8 3B 4A 12 11 4B Figure 1. Logic Diagram (c) 2001 Fairchild Semiconductor Corporation FSTD3125 * Rev. 1.0.2 www.fairchildsemi.com FSTD3125 -- 4-Bit Bus Switch with Level Shifting Pin Configuration /OE1 1A 1 14 VCC /OE4 4A 2 13 1B 3 12 /OE2 2A 4 11 4B 5 10 /OE3 3A 2B 6 9 GND 7 8 3B Figure 2. TSSOP Pin Assignments Pin Descriptions Pin # 1,4,10,13 2,5,9,12 3,6,8,11 14 7 Pin Names /OE1, /OE2, /OE3, /OE4 1A, 2A, 3A, 4A 1B, 2B, 3B, 4B VCC GND Description Bus Switch Enables Bus A Bus B Supply Voltage Ground Truth Table Inputs /OE LOW HIGH Inputs/Outputs A, B A=B High Impedance (c) 2001 Fairchild Semiconductor Corporation FST3D125 * Rev. 1.0.2 www.fairchildsemi.com 2 FSTD3125 -- 4-Bit Bus Switch with Level Shifting Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC VS VIN IIK IOUT ICC / IGND TSTG Supply Voltage DC Switch Voltage DC Input Voltage (1) Parameter Min. -0.5 -0.5 -0.5 Max. 7.0 7.0 7.0 -50 128 100 Unit V V V mA mA mA C DC Input Diode Current, VIN<0V DC Output Sink Current DC VCC / GND Current Storage Temperature Range -65 +150 Note: 1. The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol VCC VIN VOUT tr , tf TA Input Voltage Output Voltage Parameter Power Supply Operating Min. 4.5 0 0 Max. 5.5 5.5 5.5 5 DC +85 Unit V V V ns/V C Input Rise and Fall Time Switch Control Input Switch I/O (2) 0 0 -40 Operating Temperature, Free Air Note: 2. Unused control inputs must be held HIGH or LOW. They may not float. (c) 2001 Fairchild Semiconductor Corporation FST3D125 * Rev. 1.0.2 www.fairchildsemi.com 3 FSTD3125 -- 4-Bit Bus Switch with Level Shifting DC Electrical Characteristics Typical values are at VCC = 5.0V and TA = 25C. Symbol VIK VIH VOH VIL IIN IOZ Parameter Clamp Diode Voltage High-Level Input Voltage High-Level Low-Level Input Voltage Input Leakage Current Off-state Leakage Current Switch On Resistance (3) Conditions IIN = -18mA Figure 5, Figure 6, and Figure 7 0 VIN 5.5V VIN = 5.5V 0 A, B VCC VIN = 0V, IIN = 64mA VCC (V) 4.5 4.5 to 5.5 4.0 to 5.5 4.5 to 5.5 5.5 0 5.5 4.5 4.5 4.5 TA=-40 to +85C Min. 2.0 Units V V V Typ. Max. -1.2 0.8 1.0 10 1.0 4 4 35 7 7 50 1.5 V A A A RON VIN = 0V, IIN = 30mA VIN = 2.4V, IIN = 15mA /OE1 = /OE2 = GND VIN = VCC or GND, IOUT = 0 /OE1 = /OE2 = VCC VIN = VCC or GND, IOUT = 0 One Input at 3.4V, Other Inputs at VCC or GND ICC Quiescent Supply Current 5.5 10 5.5 2.5 A ICC Increase in ICC per Input mA Note: 3. Measured by the voltage drop between the A and B pins at the indicated current through the switch. On resistance is determined by the lower of the voltages on the A or B pins. AC Electrical Characteristics TA = -40 to +85C, CL = 50pF, and RU = RD = 500. Symbol tPHL, tPLH Parameter Propagation Delay, Bus-to-Bus (4) Conditions VIN = Open VIN = 7V for tPZL VIN = Open for tPZH VIN = 7V for tPLZ VIN = Open for tPHZ VCC = 4.5 - 5.5V Min. Max. 0.25 Units ns Figure Figure 3 Figure 4 Figure 3 Figure 4 Figure 3 Figure 4 tPZH ,tPZL Output Enable Time 1.0 6.1 ns tPHZ, tPLZ Output Disable Time 1.5 6.4 ns Note: 4. This parameter is guaranteed by design, but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical on resistance of the switch and the 50pF load capacitance when driven by an ideal voltage source (zero output impedance). Capacitance TA = +25C, f = 1MHz. Capacitance is characterized, but not tested. Symbol CIN CI/O Parameter Control Pin Input Capacitance Input/Output Capacitance Conditions VCC = 5.0V VCC, /OE = 5.0V 4 Typ. 3 6 Units pF pF www.fairchildsemi.com (c) 2001 Fairchild Semiconductor Corporation FST3D125 * Rev. 1.0.2 FSTD3125 -- 4-Bit Bus Switch with Level Shifting AC Loadings and Waveforms Notes: Input driven by 50 source terminated in 50. CL includes load and stray capacitance. Input PRR = 1.0MHz, tw = 500ns. Figure 3. AC Test Circuit Figure 4. AC Waveforms (c) 2001 Fairchild Semiconductor Corporation FSTD3125 * Rev. 1.0.2 www.fairchildsemi.com 5 FSTD3125 -- 4-Bit Bus Switch with Level Shifting Performance Characteristics Figure 5. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 85C Figure 6. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 25C Figure 7. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 0C (c) 2001 Fairchild Semiconductor Corporation FSTD3125 * Rev. 1.0.2 www.fairchildsemi.com 6 FSTD3125 -- 4-Bit Bus Switch with Level Shifting Physical Dimensions 0.43 TYP 0.65 1.65 0.45 6.10 12.00TOP R0.09 min & BOTTOM A. CONFORMS TO JEDEC REGISTRATION MO-153, VARIATION AB, REF NOTE 6 B. DIMENSIONS ARE IN MILLIMETERS C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS D. DIMENSIONING AND TOLERANCES PER ANSI Y14.5M, 1982 E. LANDPATTERN STANDARD: SOP65P640X110-14M F. DRAWING FILE NAME: MTC14REV6 1.00 R0.09min Figure 8. 14-Lead, Thin Shrink Small Outline Package (TSSOP) MO-153, 4mm Wide Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ (c) 2001 Fairchild Semiconductor Corporation FSTD3125 * Rev. 1.0.2 www.fairchildsemi.com 7 FSTD3125 -- 4-Bit Bus Switch with Level Shifting (c) 2001 Fairchild Semiconductor Corporation FSTD3125 * Rev. 1.0.2 www.fairchildsemi.com 8 |
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