SN74CBT16861 20-BIT FET BUS SWITCH SCDS068A – JULY 1998 – REVISED DECEMBER 1999 D D D D DGG OR DL PACKAGE (TOP VIEW) 5-Ω Switch Connection Between Two Ports TTL-Compatible Input Levels Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II Package Options Include Plastic Thin Shrink Small-Outline (DGG) and Shrink Small-Outline (DL) Packages NC 1A1 1A2 1A3 1A4 1A5 1A6 1A7 1A8 1A9 1A10 GND NC 2A1 2A2 2A3 2A4 2A5 2A6 2A7 2A8 2A9 2A10 GND description The SN74CBT16861 provides 20 bits of high-speed TTL-compatible bus switching. The low on-state resistance of the switch allows connections to be made with minimal propagation delay. The device is organized as one dual 10-bit switch with separate output-enable (OE) input. 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 the high-impedance state exists between the two ports. The SN74CBT16861 is characterized operation from –40°C to 85°C. for 1 48 2 47 3 46 4 45 5 44 6 43 7 42 8 41 9 40 10 39 11 38 12 37 13 36 14 35 15 34 16 33 17 32 18 31 19 30 20 29 21 28 22 27 23 26 24 25 VCC 1OE 1B1 1B2 1B3 1B4 1B5 1B6 1B7 1B8 1B9 1B10 VCC 2OE 2B1 2B2 2B3 2B4 2B5 2B6 2B7 2B8 2B9 2B10 NC – No internal connection FUNCTION TABLE (each 10-bit bus switch) INPUT OE FUNCTION L A port = B port H Disconnect Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 1999, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN74CBT16861 20-BIT FET BUS SWITCH SCDS068A – JULY 1998 – REVISED DECEMBER 1999 logic diagram (positive logic) 2 46 1A1 1B1 11 37 1A10 1OE 1B10 47 14 34 2A1 2B1 23 25 2A10 2OE 2B10 35 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V Continuous channel current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Input clamp current, IIK (VI/O < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA Package thermal impedance, θJA (see Note 2): DGG package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W DL package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions (see Note 3) MIN MAX VCC VIH Supply voltage 4 5.5 High-level control input voltage 2 VIL TA Low-level control input voltage Operating free-air temperature –40 UNIT V V 0.8 V 85 °C NOTE 3: All unused control inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74CBT16861 20-BIT FET BUS SWITCH SCDS068A – JULY 1998 – REVISED DECEMBER 1999 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK II ICC ∆ICC‡ Control inputs Ci Control inputs Cio(OFF) TEST CONDITIONS VCC = 4.5 V, VCC = 0, II = –18 mA VI = 5.5 V VCC = 5.5 V, VCC = 5.5 V, VI = 5.5 V or GND IO = 0, VCC = 5.5 V, VI = 3 V or 0 One input at 3.4 V, VO = 3 V or 0, VCC = 4 V, TYP at VCC = 4 V, OE = VCC ron§ VCC = 4.5 V MIN TYP† MAX UNIT –1.2 V 10 ±1 VI = VCC or GND Other inputs at VCC or GND µA 3 µA 2.5 mA 3 pF 5.5 pF VI = 2.4 V, II = 15 mA 14 22 VI = 0 II = 64 mA II = 30 mA 5 7 5 7 Ω VI = 2.4 V, II = 15 mA 10 15 † All typical values are at VCC = 5 V (unless otherwise noted), TA = 25°C. ‡ This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND. § Measured by the voltage drop between the A and B terminals at the indicated current through the switch. On-state resistance is determined by the lowest voltage of the two (A or B) terminals. switching characteristics over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1) FROM (INPUT) TO (OUTPUT) tpd¶ A or B B or A ten OE A or B PARAMETER VCC = 4 V VCC = 5 V ± 0.5 V MIN MIN MAX 0.35 2.7 6.3 1.7 UNIT MAX 0.25 ns 6.5 ns tdis A or B 1.5 8 1.8 7.1 ns OE ¶ 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). POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74CBT16861 20-BIT FET BUS SWITCH SCDS068A – JULY 1998 – REVISED DECEMBER 1999 PARAMETER MEASUREMENT INFORMATION 7V S1 500 Ω From Output Under Test Open GND CL = 50 pF (see Note A) 500 Ω TEST S1 tpd tPLZ/tPZL tPHZ/tPZH Open 7V Open Output Control (low-level enabling) LOAD CIRCUIT 3V 1.5 V 1.5 V 0V tPZL 3V Input 1.5 V 1.5 V 0V tPLH 1.5 V tPLZ 3.5 V 1.5 V tPZH tPHL VOH Output Output Waveform 1 S1 at 7 V (see Note B) 1.5 V VOL Output Waveform 2 S1 at Open (see Note B) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES 1.5 V VOL + 0.3 V VOL tPHZ VOH VOH – 0.3 V 0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. Figure 1. Load Circuit and Voltage Waveforms 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. 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