SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 • • • • DW OR N PACKAGE (TOP VIEW) Bidirectional Bus Transceivers in High-Density 20-Pin Packages Choice of True or Inverting Logic A-Bus Outputs Are Open Collector; B-Bus Outputs Are 3 State Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs A OUTPUT B OUTPUT LOGIC SN74ALS638A, SN74AS638A Open collector 3 state Inverting SN74ALS639A, SN74AS639 Open collector 3 state True DEVICE DIR A1 A2 A3 A4 A5 A6 A7 A8 GND 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 description These octal bus transceivers are designed for asynchronous two-way communication between open-collector and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are isolated. The -1 version of SN74ALS638A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are characterized for operation from 0°C to 70°C. FUNCTION TABLE INPUTS OPERATION DIR SN74ALS638A SN74AS638A SN74ALS639A SN74AS639 L L B data to A bus B data to A bus L H A data to B bus A data to B bus H X Isolation Isolation OE Copyright 1995, 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 SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 logic symbols† SN74ALS638A, SN74AS638A OE DIR A1 19 1 2 SN74ALS639A, SN74AS639 G3 OE 3 EN1 [BA] 3 EN2 [AB] DIR 18 1 B1 19 G3 1 A1 3 EN1 [BA] 3 EN2 [AB] 2 2 A2 A3 A4 A5 A6 A7 A8 18 1 B1 2 3 17 4 16 5 15 6 14 7 13 8 12 9 11 B2 A2 B3 A3 B4 A4 B5 A5 B6 A6 B7 B8 A7 A8 3 17 4 16 5 15 6 14 7 13 8 12 9 11 B2 B3 B4 B5 B6 B7 B8 † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. logic diagrams (positive logic) SN74ALS638A, SN74AS638A OE DIR A1 SN74ALS639A, SN74AS639 19 OE 1 2 DIR 18 B1 A1 19 1 2 To Seven Other Transceivers 18 B1 To Seven Other Transceivers absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V A-bus I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V B-bus I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN74ALS638A, SN74ALS639A . . . . . . . . . . . . . . . . . 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. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 recommended operating conditions SN74ALS638A SN74ALS639A UNIT MIN NOM MAX 4.5 5 5.5 VCC VIH Supply voltage VIL VOH Low-level input voltage High-level output voltage A ports 5.5 V IOH High-level output current B ports – 15 mA IOL Low level output current Low-level A or B ports 24 48† mA 70 °C High-level input voltage 2 V 0.8 TA Operating free-air temperature † Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V V 0 V electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN74ALS638A SN74ALS639A MIN VIK IOH A ports VOH B ports VOL II A or B ports Control inputs A or B ports VCC = 4.5 V, VCC = 4.5 V, II = – 18 mA VOH = 5.5 V VCC = 4.5 V to 5.5 V, IOH = – 0.4 mA IOH = – 3 mA VCC = 4 4.5 5V VCC = 4.5 V IOH = – 15 mA IOL = 12 mA VI = 7 V VI = 5.5 V 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§ VCC = 5 5.5 5V V, VI = 0 0.4 4V IO¶ B ports VCC = 5.5 V, VO = 2.25 V Outputs high SN74ALS638A VCC = 5.5 V ICC SN74ALS639A VCC = 5.5 V UNIT MAX – 1.5 0.1 VCC – 2 2.4 V mA V 3.2 2 IOL = 24 mA IOL = 48 mA† VCC = 5 5.5 5V TYP‡ 0.25 0.4 0.35 0.5 0.35 0.5 0.1 0.1 20 20 – 0.1 – 0.1 – 30 – 112 18 30 Outputs low 26 41 Outputs disabled 16 30 Outputs high 25 40 Outputs low 30 50 Outputs disabled 33 V mA µA mA mA mA 54 † Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V ‡ 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. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 680 Ω (A outputs), R1 = R2 = 500 Ω (B outputs), TA = MIN to MAX† SN74ALS638A tPLH tPHL A B tPLH tPHL B A tPLH tPHL OE A tPZH tPZL OE B tPHZ tPLZ OE B UNIT SN74ALS639A MIN MAX MIN MAX 2 12 2 12 2 12 2 12 8 25 10 30 8 30 5 22 5 25 10 30 10 45 10 35 5 20 6 21 5 22 8 25 2 10 2 10 3 15 3 16 ns ns ns ns ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V A-bus I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V B-bus I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN74AS638A, SN74AS639 . . . . . . . . . . . . . . . . . . . . 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 SN74AS638A SN74AS639 UNIT MIN NOM MAX 4.5 5 5.5 VCC VIH Supply voltage VIL VOH Low-level input voltage High-level output voltage A ports 5.5 V IOH IOL High-level output current B ports – 15 mA Low-level output current A or B ports 64 mA TA Operating free-air temperature 70 °C 4 High-level input voltage 2 V 0.8 0 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 V V SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER SN74AS638A SN74AS639 TEST CONDITIONS MIN VIK IOH A ports VOH B ports VOL A or B ports II VCC = 4.5 V, VCC = 4.5 V, II = – 18 mA VOH = 5.5 V VCC = 4.5 V to 5.5 V, IOH = – 2 mA IOH = – 3 mA VCC – 2 2.4 IOH = – 15 mA IOL = 64 mA 2.4 VCC = 4 4.5 5V VCC = 4.5 V, Control inputs A or B ports 5V VCC = 5 5.5 VI = 7 V VI = 5.5 V 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‡ VCC = 5 5.5 5V V, VI = 0 0.4 4V VCC = 5.5 V, VO = 2.25 V Outputs high IO§ SN74AS638A VCC = 5.5 V ICC SN74AS639 VCC = 5.5 V TYP† UNIT MAX – 1.2 0.1 0.55 0.1 0.1 20 70 – 0.5 – 0.75 – 50 mA V 3.2 0.35 V – 150 24 54 Outputs low 75 122 Outputs disabled 37 61 Outputs high 56 92 Outputs low 95 154 V mA µA mA mA mA Outputs disabled 62 100 † 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. § 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) tPLH tPHL A B tPLH tPHL B A tPLH tPHL OE A tPZH tPZL OE B tPHZ tPLZ OE B VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω (A outputs), R1 = R2 = 500 Ω (B outputs), TA = MIN to MAX¶ SN74AS638A SN74AS639 MIN MAX MIN MAX 2 7 2 9.5 2 6.5 2 9 5 20 5 22 2 7 2 9 5 19 5 21.5 2 9 2 11.5 2 8 2 10.5 2 10 2 10.5 2 7 2 7 2 10 2 10.5 UNIT ns ns 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 SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 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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