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Details, datasheet, quote on part number:SN74F242DR
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Datasheet text preview:
SN54F242, SN74F242 QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDFS062A D2932, MARCH 1987 REVISED OCTOBER 1993
· · · ·
Asynchronous Communication Between Data Buses Local Bus-Latch Capability Inverting Logic Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
SN54F242 . . . J PACKAGE SN74F242 . . . D OR N PACKAGE (TOP VIEW)
description
These quadruple bus transceivers are designed for asynchronous communications 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 simultaneous enabling of OEBA and OEAB. Each output reinforces its input in this transceiver configuration. Thus, 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) remain at their states. The 4-bit codes appearing on the two sets of buses will be complementary for the F242.
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
SN54F242 . . . 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 © 1993, Texas Instruments Incorporated
The SN54F242 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F242 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
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SN54F242, SN74F242 QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDFS062A D2932, MARCH 1987 REVISED OCTOBER 1993
logic symbol
OEBA OEAB A1 3 13 1 EN1 EN2 1 2 11 10 B1 B2
A2 A3
4 5
9 8
B3 B4
A4
6
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OEAB A1 1 3 13 11 OEBA B1
A2
4
10
B2
A3
5
9
B3
A4
6
8
B4
Pin numbers shown are for the D, J, and N packages.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54F242, SN74F242 QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDFS062A D2932, MARCH 1987 REVISED OCTOBER 1993
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 (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA to 5 mA Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . 0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC Current into any output in the low state: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA SN74F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Operating free-air temperature range: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54F242 MIN VCC VIH VIL IIK IOH IOL TA Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.8 18 12 48 125 0 NOM 5 MAX 5.5 SN74F242 MIN 4.5 2 0.8 18 15 64 70 NOM 5 MAX 5.5 UNIT V V V mA mA mA °C
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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