SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993 SN54F621 . . . J PACKAGE SN74F621 . . . DW OR N PACKAGE (TOP VIEW) Local Bus-Latch Capability Noninverting Logic Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs OEAB A1 A2 A3 A4 A5 A6 A7 A8 GND description These octal bus transceivers are designed for asynchronous communication between data buses. The control function implementation allows for maximum flexibility in timing. These 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 levels at the output enable (OEAB and OEBA) inputs. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC OEBA B1 B2 B3 B4 B5 B6 B7 B8 A2 A1 OEAB VCC SN54F621 . . . FK PACKAGE (TOP VIEW) The output-enable inputs can be used to disable the device so that the buses are effectively isolated. The dual-enable configuration gives the transceivers the capability of storing data by simultaneously enabling OEAB and OEBA. Each output reinforces its input in this configuration. When both OEAB and OEBA are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (16 in all) will remain at their last states. 4 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 A3 A4 A5 A6 A7 OEBA • • • The SN54F621 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74F621 is characterized for operation from 0°C to 70°C. FUNCTION TABLE INPUTS OPERATION OEBA OEAB L L B data to A bus L H B data to A bus, A data to B bus H L Isolation H H A data to B bus 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 2–1 SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993 logic symbol† 19 OEBA OEAB A1 A2 A3 A4 A5 A6 A7 A8 1 2 logic diagram (positive logic) EN2 1 OEAB 18 1 3 19 OEBA EN1 2 17 4 16 5 15 6 14 7 13 8 12 9 11 B1 B2 2 A1 18 B1 B3 B4 B5 B6 B7 B8 To Seven Other Channels † 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 (excluding I/O ports) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 1.2 V to 7 V Input current range, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA to 5 mA Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V Current into any output in the low state: SN54F621 (A1 – A8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN54F621 (B1 – B8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA SN74F621 (A1 – A8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA SN74F621 (B1 – B8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Operating free-air temperature range: SN54F621 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74F621 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTE 1: The input-voltage ratings may be exceeded provided the input-current ratings are observed. recommended operating conditions SN54F621 VCC VIH Supply voltage VOH VIL High-level output voltage IIK Input clamp current IOL Low level output current Low-level TA Operating free-air temperature 2–2 High-level input voltage SN74F621 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 5.5 Low-level input voltage UNIT V V 5.5 V 0.8 0.8 V – 18 – 18 mA A1 – A8 20 24 B1 – B8 48 64 – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 125 0 70 mA °C SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK IOH TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V, A1 – A8 VOL VCC = 4 4.5 5V B1 – B8 A and B ports II OEAB or OEBA IIH‡ IIL‡ A and B ports OEAB or OEBA A and B ports OEAB or OEBA MIN SN54F621 TYP† MAX II = – 18 mA VOH = 5.5 V – 1.2 V 250 µA 0.5 IOL = 48 mA IOL = 64 mA 0.38 0.55 VCC = 5 5.5 5V V, VI = 2 2.7 7V VCC = 5 5.5 5V V, VI = 0 0.5 5V ICCH VCC = 5.5 V ICCL VCC = 5.5 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. UNIT 250 0.3 VI = 5.5 V VI = 7 V SN74F621 TYP† MAX – 1.2 IOL = 20 mA IOL = 24 mA VCC = 5 5.5 5V MIN 0.35 0.5 0.42 0.55 1 1 0.1 0.1 70 70 20 20 – 0.65 – 0.65 – 0.6 – 0.6 V mA µA mA 105 140 105 140 mA 105 140 105 140 mA switching characteristics (see Note 2) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, RL = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX§ ′F621 tPLH tPHL A B tPLH tPHL B A tPLH tPHL OEBA A tPLH tPHL OEAB B UNIT SN54F621 SN74F621 MIN TYP MAX MIN MAX MIN MAX 6 9.5 12 5.5 13 5.5 13 2.5 3.8 8 2 8.5 2 8.5 6 9 12 5.5 12.5 5.5 12.5 2.5 4 7.5 2 8 2 8 6 10 13.5 5.5 14 5.5 14 3.5 6.5 10.5 2.5 11 2.5 11 7 12 15 6 17 6 17 3.5 6.5 9.5 3 10 3 10 ns ns ns ns § For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 2: Load circuits and waveforms are shown in Section 1. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–3 SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993 2–4 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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