SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994 • • • SN54ALS243A . . . J PACKAGE SN74ALS243A . . . D OR N PACKAGE (TOP VIEW) Two-Way Asynchronous Communication Between Data Buses pnp Inputs Reduce dc Loading Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs OEAB NC A1 A2 A3 A4 GND description These quadruple bus transceivers are designed for asynchronous two-way 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 (OEBA and OEAB) inputs. The output-enable inputs can be used to disable the device so that the buses are effectively isolated. 1 14 2 13 3 12 4 11 5 10 6 9 7 8 VCC OEBA NC B1 B2 B3 B4 NC OEAB NC VCC OEBA SN54ALS243A . . . FK PACKAGE (TOP VIEW) A1 NC A2 NC A3 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 NC NC B1 NC B2 A4 GND NC B4 B3 The dual-enable configuration gives the quadruple bus transceivers the capability to store data by simultaneously enabling OEBA and OEAB. Each output reinforces its input in this transceiver configuration. When both control inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (eight in all) retain their states. The 4-bit codes appearing on the two sets of buses are identical. 4 NC – No internal connection The SN54ALS243A is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74ALS243A is characterized for operation from 0°C to 70°C. FUNCTION TABLE INPUTS OEAB OEBA FUNCTION L L A to B H H B to A H L Isolation H Latch A and B (A = B) L 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 SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994 logic symbol† OEBA 13 1 OEAB A1 A2 A3 A4 3 logic diagram (positive logic) EN1 OEAB EN2 A1 11 1 4 2 10 9 8 6 13 3 11 4 10 5 9 6 8 OEBA B1 B1 B2 A2 5 1 B2 B3 B4 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages. A3 A4 B3 B4 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: SN54ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 SN54ALS243A VCC VIH Supply voltage VIL IOH Low-level input voltage IOL TA 2 High-level input voltage SN74ALS243A MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 UNIT V V 0.7 0.8 V High-level output current – 12 – 15 mA Low-level output current 12 24 mA 70 °C Operating free-air temperature – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 125 0 SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994 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 = – 0.4 mA VCC = 4.5 V IOH = – 3 mA IOH = – 12 mA 5V VCC = 5 5.5 SN74ALS243A TYP† MAX MIN – 1.2 VCC – 2 2.4 – 1.2 VCC – 2 2.4 3.2 3.2 UNIT V V 2 IOH = – 15 mA IOL = 12 mA VCC = 4 4.5 5V Control inputs SN54ALS243A TYP† MAX TEST CONDITIONS 2 0.25 0.4 0.25 0.4 0.35 0.5 IOL = 24 mA VI = 7 V 0.1 0.1 VI = 5.5 V 0.1 0.1 20 20 20 20 – 0.1 – 0.1 – 0.1 – 0.1 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§ VCC = 5.5 V, VO = 2.25 V Outputs high 15 30 15 25 ICC VCC = 5.5 V Outputs low 20 35 20 30 Outputs disabled 21 37 21 32 – 20 – 112 – 30 – 112 V mA µA mA mA mA † 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) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX¶ SN54ALS243A tPLH tPHL A or B B or A tPZH tPZL OEAB B tPHZ tPLZ OEAB B tPZH tPZL OEBA A tPHZ tPLZ OEBA A UNIT SN74ALS243A MIN MAX MIN MAX 4 15 4 11 4 15 4 11 7 25 7 20 7 25 7 20 2 16 2 14 3 27 3 22 7 25 7 20 7 25 7 20 2 16 2 14 3 27 3 22 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 3 SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS069B – DECEMBER 1982 – REVISED DECEMBER 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 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. 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