SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 • • • • SN54BCT245 . . . J OR W PACKAGE SN74BCT245 . . . DB, DW, OR N PACKAGE (TOP VIEW) State-of-the-Art BiCMOS Design Significantly Reduces ICCZ ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers Package Options Include Plastic Small-Outline (DW) and Shrink Small-Outline (DB) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic and Ceramic 300-mil DIPs (J, N) DIR A1 A2 A3 A4 A5 A6 A7 A8 GND description These octal bus transceivers are designed for asynchronous communication between data buses. The devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. 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 A2 A1 DIR VCC OE SN54BCT245 . . . FK PACKAGE (TOP VIEW) A3 A4 A5 A6 A7 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 B1 B2 B3 B4 B5 A8 GND B8 B7 B6 The SN74BCT245 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area. 4 The SN54BCT245 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74BCT245 is characterized for operation from 0°C to 70°C. FUNCTION TABLE INPUTS OPERATION OE DIR L L B data to A bus L H A data to B bus H X Isolation Copyright 1994, 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 2–1 SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 logic symbol† OE DIR A1 19 1 2 logic diagram (positive logic) DIR G3 1 3EN1[BA] 3EN2[AB] 19 18 1 B1 A1 OE 2 2 A2 A3 A4 A5 A6 A7 A8 3 17 4 16 5 15 6 14 7 13 8 12 9 11 B2 18 B3 B1 B4 B5 B6 B7 To Seven Other Channels 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: Control inputs (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V I/O ports (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC Current into any output in the low state: SN54BCT245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA SN74BCT245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Power dissipation (DB package only) (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW Operating free-air temperature range: SN54BCT245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74BCT245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. Power dissipation is application dependent and is a function of supply voltage, operating temperature, the number of outputs switching simultaneously, and output duty cycle. Because the thermal resistance of the DB package is higher than that of the DW or N packages, the DB package may not be suitable for some applications. 2–2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 recommended operating conditions SN54BCT245 SN74BCT245 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IIK Low-level input voltage 0.8 0.8 V Input clamp current –18 –18 mA IOH High level output current High-level A port –3 –3 B port –12 –15 IOL Low level output current Low-level A port 20 24 B port 48 64 TA Operating free-air temperature High-level input voltage 2 2 – 55 125 V V 0 70 mA mA °C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VCC = 4.5 V, A port 5V VCC = 4 4.5 VOH B port A port VCC = 4.5 V A or B port II IIH‡ IIL‡ IOS§ ICCL ICCH ICCZ Ci Cio i Control input A or B port Control input A or B port Control input A port B port A to B IOH = – 3 mA IOH = – 3 mA IOH = –12 mA IOH = – 15 mA 3.4 2.5 3.4 2.4 3.3 2.4 3.3 2.4 3.3 2.4 3.3 2 3.2 2 3.1 VCC = 4 4.5 5V IOL = 48 mA IOL = 64 mA 0.38 0.55 5V VI = 5 5.5 VCC = 5 5.5 5V V, VI = 2 2.7 7V VCC = 5 5.5 5V V, VI = 0 0.5 5V VCC = 5 5.5 5V V, VO = 0 Control input VCC = 5.5 V VCC = 5 V, VCC = 5 V V, –1.2 2.5 0.5 5V VCC = 5 5.5 V, SN74BCT245 TYP† MAX MIN –1.2 0.3 VCC = 5.5 V VCC = 5.5 V B to A II = –18 mA IOH = –1 mA IOL = 20 mA IOL = 24 mA A to B A to B MIN VCC = 4 4.5 5V VOL B port SN54BCT245 TYP† MAX TEST CONDITIONS 0.35 0.5 0.42 0.55 1 1 0.1 0.1 70 70 20 20 – 0.65 – 0.65 –1.2 –1.2 –150 – 60 –150 –100 – 225 –100 – 225 5 V or 0 5V VO = 2 2.5 0.5 V V – 60 VI = 2.5 V or 0.5 V UNIT V mA µA mA mA 57 90 57 90 mA 36 57 36 57 mA 10 15 10 15 mA 7 7 9 9 12 12 pF pF † All typical values are at VCC = 5 V, TA = 25°C. ‡ For I/O ports, the parameters IIH and IIL include the off-state output current. § Not more than one output should be tested at a time, and the duration of the test should not exceed one second. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–3 SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 switching characteristics (see Note 3) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† ′BCT245 tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B SN54BCT245 SN74BCT245 MIN TYP MAX MIN MAX MIN MAX 1 4.4 6 1 7.2 1 7 1.5 4.8 6.6 1.5 7.6 1.5 7 1.5 8 9.4 1.5 11.2 1.5 10.9 1.5 8 10.2 1.5 11.8 1.5 11.6 1.5 5.8 8.3 1.5 9.7 1.5 9.3 1.5 5.1 7.8 1.5 9.6 1.5 9.1 † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and voltage waveforms are shown in Section 1. 2–4 POST OFFICE BOX 655303 UNIT • DALLAS, TEXAS 75265 ns ns ns SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 TYPICAL CHARACTERISTICS† Figures 1 through 4 show the typical power dissipation for an SN74BCT245 over variations in outputs switching, output frequency, and capacitive load. POWER DISSIPATION vs FREQUENCY POWER DISSIPATION vs FREQUENCY 1400 900 750 VCC = 5.5 V TA = 70°C RL = 500 Ω Air Flow = 0 CL = 50 pF Eight Switching VCC = 5.5 V TA = 70°C RL = 500 Ω Air Flow = 0 CL = 15 pF PD – Power Dissipation – mW PD – Power Dissipation – mW 1050 Four Switching 600 450 One Switching 300 1200 1000 800 Four Switching 600 One Switching 400 200 150 0 0 0 10 20 30 40 50 10 0 f – Frequency – MHz 20 1750 VCC = 5.5 V TA = 70°C RL = 500 Ω Air Flow = 0 CL = 150 pF Eight Switching 1500 PD – Power Dissipation – mW 1250 50 POWER DISSIPATION vs FREQUENCY 1750 1500 40 Figure 2 POWER DISSIPATION vs FREQUENCY VCC = 5.5 V TA = 70°C RL = 500 Ω Air Flow = 0 CL = 100 pF 30 f – Frequency – MHz Figure 1 PD – Power Dissipation – mW Eight Switching Four Switching 1000 750 One Switching 500 1250 Eight Switching Four Switching 1000 750 One Switching 500 250 250 0 0 0 10 20 30 f – Frequency – MHz 40 50 0 Figure 3 10 20 30 40 f – Frequency – MHz 50 Figure 4 † The dashed lines are for the DB package only. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–5 SN54BCT245, SN74BCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994 2–6 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. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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