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Details, datasheet, quote on part number:SN74ALS243A-1
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Datasheet text preview:
SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS069B DECEMBER 1982 REVISED DECEMBER 1994
· · ·
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
SN54ALS243A . . . J PACKAGE SN74ALS243A . . . D OR N PACKAGE (TOP VIEW)
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. 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.
OEAB NC A1 A2 A3 A4 GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VCC OEBA NC B1 B2 B3 B4
SN54ALS243A . . . FK PACKAGE (TOP VIEW)
A1 NC A2 NC A3
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
NC OEAB NC VCC OEBA NC NC B1 NC B2
NC No internal connection FUNCTION A to B B to A Isolation Latch A and B (A = B)
Copyright © 1994, Texas Instruments Incorporated
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 L H H L OEBA L H L H
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
A4 GND NC B4 B3
1
SN54ALS243A, SN74ALS243A QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS069B DECEMBER 1982 REVISED DECEMBER 1994
logic symbol
OEBA OEAB A1 3 13 1 EN1 EN2 1 2 11 10 B1 B2
logic diagram (positive logic)
OEAB A1 1 3 13 11 OEBA B1
A2 A3
4 5
A2 9 8 B3 B4
4
10
B2
A4
6
A3
5
9
B3
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.
A4
6
8
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 MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.7 12 12 125 0 NOM 5 MAX 5.5 SN74ALS243A MIN 4.5 2 0.8 15 24 70 NOM 5 MAX 5.5 UNIT V V V mA mA °C
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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 TEST CONDITIONS CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V II = 18 mA IOH = 0.4 mA IOH = 3 mA IOH = 12 mA IOH = 15 mA IOL = 12 mA IOL = 24 mA VI = 7 V VI = 5.5 V VI = 2 7 V 2.7 VI = 0 4 V 0.4 VO = 2.25 V Outputs high Outputs low Outputs disabled 20 15 20 21 MIN SN54ALS243A TYP MAX 1.2 VCC 2 2.4 2 2 0.25 0.4 0.1 0.1 20 20 0.1 0.1 112 30 35 37 30 15 20 21 0.25 0.35 0.4 0.5 0.1 0.1 20 20 0.1 0.1 112 25 30 32 mA V mA µA mA mA 3.2 VCC 2 2.4 3.2 MIN SN74ALS243A TYP MAX 1.2 UNIT V
VOH
V
VOL II IIH IIL IO§ ICC Control inputs A or B ports Control inputs A or B ports Control inputs A or B ports
VCC = 4 5 V 4.5 VCC = 5 5 V 5.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5.5 V, 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. § 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)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX¶ SN54ALS243A MIN tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ A or B or 4 B or A or B B A A 4 7 OEAB OEAB OEBA OEBA 7 2 3 7 7 2 3 MAX 15 15 25 25 16 27 25 25 16 27 SN74ALS243A MIN 4 4 7 7 2 3 7 7 2 3 MAX 11 11 20 20 14 22 20 20 14 22 ns ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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