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Texas Instruments (TI) Electronic Components Datasheet

SN74F621 Datasheet

Octal Bus Transceivers

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Local Bus-Latch Capability
Noninverting Logic
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
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.
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)
OEAB
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 OEBA
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
SN54F621 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
A3 4
18 B1
A4 5
17 B2
A5 6
16 B3
A6 7
15 B4
A7 8
14 B5
9 10 11 12 13
FUNCTION TABLE
INPUTS
OEBA OEAB
OPERATION
L L B data to A bus
L
H
B data to A bus,
A data to B bus
HL
Isolation
H H A data to B bus
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
Copyright © 1993, Texas Instruments Incorporated
2–1


Texas Instruments (TI) Electronic Components Datasheet

SN74F621 Datasheet

Octal Bus Transceivers

No Preview Available !

SN54F621, SN74F621
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993
logic symbol
logic diagram (positive logic)
OEBA
OEAB
19
1
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
EN1
EN2
1
2
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
B8
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
19
OEBA
OEAB 1
A1 2
18 B1
To Seven Other Channels
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
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
Operating free-air temperature
A1 – A8
B1 – B8
SN54F621
MIN NOM MAX
4.5 5 5.5
2
5.5
0.8
– 18
20
48
– 55 125
SN74F621
MIN NOM MAX
4.5 5 5.5
2
5.5
0.8
– 18
24
64
0 70
UNIT
V
V
V
V
mA
mA
°C
2–2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74F621
Description Octal Bus Transceivers
Maker Texas
Total Page 14 Pages
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