SN64BCT25245 25-Ω OCTAL BUS TRANSCEIVER SCBS060A – JUNE 1990 – REVISED DECEMBER 1993 • • • • • • • DW OR NT PACKAGE (TOP VIEW) State-of-the-Art BiCMOS Design Significantly Reduces ICCZ Designed to Facilitate Incident-Wave Switching for Line Impedances of 25 Ω or Greater Distributed VCC and GND Pins Minimize Noise Generated by the Simultaneous Switching of Outputs Data Flow-Through Pinout (All Inputs on Opposite Side From Outputs) High-Impedance State During Power Up and Power Down ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015 Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT) A1 GND A2 A3 GND A4 A5 GND A6 A7 GND A8 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13 DIR B1 B2 VCC B3 B4 B5 B6 VCC B7 B8 OE description The SN64BCT25245 is a 25-Ω octal bus transceiver designed for asynchronous communication between data buses. It improves both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented transceivers. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction-control (DIR) input. The output-enable (OE) input can disable the device so that both buses are effectively isolated. This transceiver is capable of sinking 188-mA IOL, which facilitates switching 25-Ω transmission lines on the incident wave. The distributed VCC and GND pins minimize switching noise for more reliable system operation. The outputs are in a high-impedance state during power up and power down while the supply voltage is less than approximately 3 V. The SN64BCT25245 is characterized for operation from – 40°C to 85°C and 0°C to 70°C. FUNCTION TABLE INPUTS OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation Copyright 1993, 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 3–1 SN64BCT25245 25-Ω OCTAL BUS TRANSCEIVER SCBS060A – JUNE 1990 – REVISED DECEMBER 1993 logic symbol† OE DIR A1 13 24 logic diagram (positive logic) G3 DIR 24 3EN1[BA] 3EN2[AB] 1 13 23 1 B1 A1 OE 1 2 A2 A3 A4 A5 A6 A7 A8 3 22 4 20 6 19 7 18 9 17 10 15 12 14 B2 23 B3 B1 B4 B5 B6 To Seven Other Channels B7 B8 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 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): Control inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . . . – 0.5 V to 7 V Voltage range applied to any output in the high state, VO (B port) . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC Input clamp current, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA Current into any output in the low state, IO: A port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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. NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. recommended operating conditions MIN NOM MAX 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IIK Low-level input voltage 0.8 V Input clamp current –18 mA IOH High level output current High-level IOL Low level output current Low-level TA Operating free-air temperature 3–2 High-level input voltage 2 POST OFFICE BOX 655303 V A port – 80 B port –3 A port 188 B port 24 – 40 • DALLAS, TEXAS 75265 V 85 mA mA °C SN64BCT25245 25-Ω OCTAL BUS TRANSCEIVER SCBS060A – JUNE 1990 – REVISED DECEMBER 1993 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL TEST CONDITIONS II = –18 mA IOH = – 3 mA 2.7 B port VCC = 4.5 V, VCC = 4.5 V, IOH = – 80 mA IOH = – 3 mA 2.4 A port VCC = 4 4.5 5V IOL = 94 mA IOL = 188 mA 0.42 B port VCC = 4.5 V, IOL = 24 mA VO = 2.7 V 0.35 A port IOZ VCC = 1 1.8 8 V to 0 (power down) IIH‡ IIL‡ IOS§ ICCL ICCH ICCZ Ci Cio TYP† VCC = 4.5 V, VCC = 4.75 V, VCC = 0 to 2 2.3 3 V (power up) II MIN A and B ports DIR and OE A and B ports DIR and OE A and B ports DIR and OE B port¶ A to B port B to A port A to B port B to A port OE and DIR A port B port VO = 0.5 V VO = 2.7 V VO = 0.5 V VCC = 0 to 5.5 5 5 V, V VI = 5 5.5 5V 5V VCC = 5 5.5 V, 7V VI = 2 2.7 VCC = 5 5.5 5V V, VI = 0 0.5 5V VCC = 5.5 V, VO = 0 V V 3.3 0.55 0.7 OE at 0.8 08V OE at 0.8 08V 70 µA – 0.6 mA 70 µA – 0.6 mA 0.1 70 20 – 60 VI = 2.5 V to 0.5 V VI = 2 2.5 5 V to 0 0.5 5V µA mA – 150 mA 60 95 125 36 46 63 80 12 16 8 mA – 0.6 06 48 18 V 0.5 0.25 VCC = 5 5.5 5V VCC = 5 5.5 5V V, UNIT – 1.2 2 VCC = 5 5.5 5V VCC = 5.5 V VCC = 5.5 V, MAX mA mA mA pF pF F 8 † All typical values are at VCC = 5 V, TA = 25°C. ‡ For I/O ports, the parameters IIH and IIL include the off-state outputs current. § Not more than one output should be tested at a time, and the duration of the test should not exceed one second. ¶ Testing for this parameter on the A port is not recommended. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3–3 SN64BCT25245 25-Ω OCTAL BUS TRANSCEIVER SCBS060A – JUNE 1990 – REVISED DECEMBER 1993 switching characteristics (see Note 2) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A B tPLH tPHL B A tPZH tPZL OE A tPHZ tPLZ OE A tPZH tPZL OE B tPHZ tPLZ OE B POST OFFICE BOX 655303 TA = – 40°C to 85°C UNIT TA = 0°C to 70°C MIN TYP MAX MIN MAX MIN MAX 1.2 3.3 5.1 1.2 5.7 1.2 5.7 1.9 4.3 6.7 1.9 7.3 1.9 7.2 1.2 3.3 4.8 1.2 5.5 1.2 5.5 2.1 4 5.6 2.1 6.3 2.1 6.2 3.7 6.3 8.4 3.7 9.7 3.7 9.6 4.5 7.4 9.2 4.5 10.6 4.5 10.3 1.8 3.7 5.5 1.8 6.2 1.8 6.2 3.3 5.1 7.2 3.3 8.8 3.3 8.3 3.4 5.7 7.9 3.4 8.9 3.4 8.9 4.3 6.6 8.7 4.3 9.9 4.3 9.7 2.7 4.5 6.3 2.7 6.9 2.7 6.9 1.7 4.5 6.8 1.7 7.7 1.7 7.5 NOTE 2: Load circuits and voltage waveforms are shown in Section 1. 3–4 VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω VCC = 5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω Ω, TA = 25°C • DALLAS, TEXAS 75265 ns ns ns ns ns ns 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. 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