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Part: SNJ54F621W
Category:
Logic
-> Transceivers
-> Standard Transceivers
Description: ti SN54F621, Octal Bus Transceivers With Open-collector Outputs
Company: Texas Instruments, Inc.
Datasheet: Download SNJ54F621W datasheet File size : 214 kB
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Datasheet text preview:
SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS
SDFS004B D2932, MARCH 1987 REVISED OCTOBER 1993
· · ·
Local Bus-Latch Capability Noninverting Logic Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
SN54F621 . . . J PACKAGE SN74F621 . . . DW OR N PACKAGE (TOP VIEW)
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. 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. 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 OEBA L L H H OEAB L H L H OPERATION B data to A bus B data to A bus, A data to B bus Isolation A data to B bus
OEAB A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
V CC OEBA B1 B2 B3 B4 B5 B6 B7 B8
SN54F621 . . . FK PACKAGE (TOP VIEW)
A2 A1 OEAB VCC
A3 A4 A5 A6 A7
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
OEBA B1 B2 B3 B4 B5
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.
Copyright © 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
A8 GND B8 B7 B6
21
SN54F621, SN74F621 OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS
SDFS004B D2932, MARCH 1987 REVISED OCTOBER 1993
logic symbol
19 OEBA OEAB A1 1 2 EN1 EN2 1 2 18 B1
logic diagram (positive logic)
OEBA OEAB 19 1
A2 A3 A4 A5 A6 A7 A8
3 4 5 6 7 8 9
17 16 15 14 13 12 11
B2 B3 B4 B5 B6 B7 B8
A1
2
18
B1
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 MIN VCC VIH VOH VIL IIK IOL TA Supply voltage High-level input voltage High-level output voltage Low-level input voltage Input clamp current Low-level output current output current Operating free-air temperature A1 A8 B1 B8 55 4.5 2 5.5 0.8 18 20 48 125 0 NOM 5 MAX 5.5 SN74F621 MIN 4.5 2 5.5 0.8 18 24 64 70 NOM 5 MAX 5.5 UNIT V V V V mA mA °C
22
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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 A1 A8 VOL B1 B8 II IIH IIL A and B ports OEAB or OEBA A and B ports OEAB or OEBA A and B ports OEAB or OEBA VCC = 5 5 V 5.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 4 5 V 4.5 VCC = 4.5 V, VCC = 4.5 V, TEST CONDITIONS CONDITIONS II = 18 mA VOH = 5.5 V IOL = 20 mA IOL = 24 mA IOL = 48 mA IOL = 64 mA VI = 5.5 V VI = 7 V VI = 2 7 V 2.7 VI = 0 5 V 0.5 105 105 0.3 0.38 MIN SN54F621 TYP MAX 1.2 250 0.5 0.35 0.55 0.42 1 0.1 70 20 0.65 0.6 140 140 105 105 0.55 1 0.1 70 20 0.65 0.6 140 140 mA µA mA mA mA 0.5 V MIN SN74F621 TYP MAX 1.2 250 UNIT V µA
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.
switching characteristics (see Note 2)
VCC = 5 V, CL = 50 pF, RL = 500 , TA = 25°C F621 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL A B B A A B 6 2.5 6 2.5 6 3.5 7 3.5 TYP 9.5 3.8 9 4 10 6.5 12 6.5 MAX 12 8 12 7.5 13.5 10.5 15 9.5 VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 , TA = MIN to MAX§ SN54F621 MIN 5.5 2 5.5 2 5.5 2.5 6 3 MAX 13 8.5 12.5 8 14 11 17 10 SN74F621 MIN 5.5 2 5.5 2 5.5 2.5 6 3 MAX 13 8.5 12.5 8 14 11 17 10 ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
OEBA OEAB
§ 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
23
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