SN74CBT3245 OCTAL BUS SWITCH SCDS002C – NOVEMBER 1992 – REVISED MAY 1995 DB, DW, OR PW PACKAGE (TOP VIEW) Functionally Equivalent to QS3245 Standard ’245-Type Pinout 5-Ω Switch Connection Between Two Ports TTL-Compatible Control Input Levels Package Options Include Shrink Small-Outline (DB), Plastic Small-Outline (DW), and Thin Shrink Small-Outline (PW) Packages NC A1 A2 A3 A4 A5 A6 A7 A8 GND description The SN74CBT3245 provides eight bits of high-speed TTL-compatible bus switching in a standard ’245 device pinout. The low on-state resistance of the switch allows connections to be made with minimal propagation delay. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC OE B1 B2 B3 B4 B5 B6 B7 B8 The device is organized as one 8-bit switch. When output enable (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. The SN74CBT3245 is characterized for operation from – 40°C to 85°C. FUNCTION TABLE INPUT OE INPUTS/ OUTPUTS A, B L A=B H Z logic diagram A1 B1 A8 B8 OE 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 1995, Texas Instruments Incorporated ADVANCE INFORMATION concerns new products in the sampling or preproduction phase of development. Characteristic data and other specifications are subject to change without notice. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 ADVANCE INFORMATION D D D D D SN74CBT3245 OCTAL BUS SWITCH SCDS002C – NOVEMBER 1992 – REVISED MAY 1995 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 Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . 1.6 W PW package . . . . . . . . . . . . . . . . . . 0.7 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 maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. For more information, refer to the Package Thermal Considerations application note in the 1994 ABT Advanced BiCMOS Technology Data Book, literature number SCBD002B. ADVANCE INFORMATION recommended operating conditions MIN MAX 5.5 VCC VIH Supply voltage 4 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 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK II ICC ∆ICC§ Control pins Ci Control pins Cio(OFF) ron¶ TEST CONDITIONS VCC = 4.5 V, VCC = 5.5 V, II = – 18 mA VI = 5.5 V or GND VCC = 5.5 V, VCC = 5.5 V, IO = 0, One input at 3.4 V, VI = 3 V or 0 VO = 3 V or 0, OE = VCC MIN TYP‡ VI = VCC or GND Other inputs at VCC or GND VCC = 4 V, VI = 2.4 V, VI = 0, II = 15 mA II = 64 mA VCC = 4.5 V VI = 0, VI = 2.4 V, II = 30 mA II = 15 mA MAX UNIT –1.2 V ±5 µA 50 µA 3.5 mA 3 pF 6 pF 5 7 5 7 Ω 10 15 ‡ All typical values are at VCC = 5 V, 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 lower of the voltages of the two (A or B) terminals. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74CBT3245 OCTAL BUS SWITCH SCDS002C – NOVEMBER 1992 – REVISED MAY 1995 switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd† A or B B or A ten OE A or B MIN MAX UNIT 0.25 ns ns tdis A or B ns OE † This parameter is characterized but not tested. This propagation delay is based on the RC time constant of the typical on-state resistance of the switch and a load capacitance of 50 pF. 7V S1 500 Ω From Output Under Test Open GND CL = 50 pF (see Note A) TEST S1 tpd tPLZ/tPZL tPHZ/tPZH Open 7V Open 500 Ω 3V Output Control (low-level enabling) LOAD CIRCUIT 1.5 V 3V 1.5 V 1.5 V 0V tPLH tPHL VOH Output 1.5 V 1.5 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES tPLZ 3.5 V Output Waveform 1 S1 at 7 V (see Note B) Output Waveform 2 S1 at Open (see Note B) 1.5 V 0V tPZL Input ADVANCE INFORMATION PARAMETER MEASUREMENT INFORMATION 1.5 V VOL + 0.3 V VOL tPHZ tPZH VOH 1.5 V 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. v v v Figure 1. Load Circuit and Voltage Waveforms POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 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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