SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 1994 • • • 3-State Outputs Drive Bus Lines Directly pnp Inputs Reduce dc Loading Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs SN54ALS245A, SN54AS245 . . . J PACKAGE SN74ALS245A, SN74AS245 . . . DW OR N PACKAGE (TOP VIEW) DIR A1 A2 A3 A4 A5 A6 A7 A8 GND description These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. 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 SN54ALS245A, SN54AS245 . . . FK PACKAGE (TOP VIEW) A2 A1 DIR VCC OE The devices allow 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 be used to disable the device so that the buses are effectively isolated. 1 The -1 version of the SN74ALS245A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS245A. 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 SN54ALS245A and SN54AS245 are characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74ALS245A and SN74AS245 are characterized for operation from 0°C to 70°C. 4 FUNCTION TABLE INPUTS OE DIR OPERATION 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 1 SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 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 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, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS245A . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74ALS245A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. recommended operating conditions SN54ALS245A VCC VIH Supply voltage VIL IOH Low-level input voltage IOL Low level output current Low-level High-level input voltage MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 High-level output current TA Operating free-air temperature § Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V 2 SN74ALS245A POST OFFICE BOX 655303 – 55 • DALLAS, TEXAS 75265 2 UNIT V V 0.7 0.8 V – 12 – 15 mA 12 24 48§ mA 70 °C 125 0 SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 1994 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN54ALS245A TYP† MAX TEST CONDITIONS MIN VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 0.4 mA VCC = 4.5 V IOH = – 3 mA IOH = – 12 mA –1.5 VCC – 2 2.4 II VCC = 4.5 V Control inputs A or B ports VCC = 5 5.5 5V VI = 7 V VI = 5.5 V Control inputs A or B ports§ VCC = 5 5.5 5V V, VI = 2 2.7 7V IIL Control inputs A or B ports§ VCC = 5 5.5 5V V, VI = 0 0.4 4V VCC = 5.5 V, VO = 2.25 V Outputs high ICC 3.2 3.2 VCC = 5.5 V UNIT V V 2 0.25 0.4 IOL = 24 mA IOL = 48 mA‡ IIH IO¶ –1.5 VCC – 2 2.4 2 IOH = – 15 mA IOL= 12 mA VOL SN74ALS245A TYP† MAX MIN – 20 0.25 0.4 0.35 0.5 0.35 0.5 0.1 0.1 0.1 0.1 20 20 20 20 – 0.1 – 0.1 – 0.1 – 0.1 –112 – 30 –112 30 48 30 45 Outputs low 36 60 36 55 Outputs disabled 38 63 38 58 V mA µA mA mA mA † All typical values are VCC = 5 V, TA = 25°C. ‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX# SN54ALS245A tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B UNIT SN74ALS245A MIN MAX MIN MAX 1 19 3 10 1 14 3 10 2 30 5 20 2 29 5 20 2 14 2 10 2 30 4 15 ns ns ns # For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 1994 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54AS245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74AS245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. recommended operating conditions SN54AS245 VCC VIH Supply voltage VIL IOH Low-level input voltage IOL TA Low-level output current High-level input voltage SN74AS245 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 High-level output current – 55 V V 0.8 0.8 V – 12 – 15 mA 64 mA 70 °C 48 Operating free-air temperature UNIT 125 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL II A or B ports MIN VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 2 mA VCC = 4.5 V IOH = – 3 mA IOH = – 12 mA VCC = 4 4.5 5V Control inputs SN54AS245 TYP‡ MAX TEST CONDITIONS VCC = 5 5.5 5V SN74AS245 TYP‡ MAX MIN –1.2 VCC – 2 2.4 –1.2 VCC – 2 2.4 3.2 3.2 V V 2 IOH = – 15 mA IOL = 48 mA UNIT 2 0.3 0.55 0.35 0.55 IOL = 64 mA VI = 7 V 0.1 0.1 VI = 5.5 V 0.1 0.1 50 20 70 70 IIH Control inputs A or B ports§ VCC = 5 5.5 5V V, VI = 2 2.7 7V IIL Control inputs A or B ports§ 5V VCC = 5 5.5 V, 4V VI = 0 0.4 IO¶ VCC = 5.5 V, VO = 2.25 V Outputs high 62 97 62 97 ICC VCC = 5.5 V Outputs low 95 143 95 143 Outputs disabled 79 123 79 123 – 50 – 0.5 – 0.5 – 0.75 – 0.75 – 150 – 50 – 150 V mA µA mA mA mA ‡ All typical values are VCC = 5 V, TA = 25°C. § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 1994 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN54AS245 tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B UNIT SN74AS245 MIN MAX MIN MAX 2 9.5 2 7.5 2 9 2 7 2 11 2 9 2 10.5 2 8.5 2 7.5 2 5.5 2 12 2 9.5 ns ns ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272 – NOVEMBER 1994 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point From Output Under Test CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.5 V Timing Input Test Point LOAD CIRCUIT FOR 3-STATE OUTPUTS 3.5 V High-Level Pulse 1.3 V R2 1.3 V 1.3 V 0.3 V 0.3 V Data Input tw th tsu 3.5 V 1.3 V 3.5 V Low-Level Pulse 1.3 V 0.3 V 1.3 V 0.3 V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES VOLTAGE WAVEFORMS PULSE DURATIONS 3.5 V Output Control (low-level enabling) 1.3 V 1.3 V 0.3 V tPZL Waveform 1 S1 Closed (see Note B) tPLZ [3.5 V 1.3 V tPHZ tPZH Waveform 2 S1 Open (see Note B) 1.3 V VOL 0.3 V VOH 1.3 V 0.3 V [0 V 3.5 V 1.3 V Input 1.3 V 0.3 V tPHL tPLH VOH In-Phase Output 1.3 V 1.3 V VOL tPLH tPHL VOH Out-of-Phase Output (see Note C) 1.3 V 1.3 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS 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. When measuring propagation delay items of 3-state outputs, switch S1 is open. D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%. E. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuits and Voltage Waveforms 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. 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