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SN54HC645 Datasheet Preview

SN54HC645 Datasheet

OCTAL BUS TRANSCEIVERS

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D Wide Operating Voltage Range of 2 V to 6 V
D High-Current 3-State Outputs Can Drive Up
To 15 LSTTL Loads
D Low Power Consumption, 80-µA Max ICC
SN54HC645 . . . J OR W PACKAGE
SN74HC645 . . . DW, N, OR NS PACKAGE
(TOP VIEW)
SN54HC645, SN74HC645
OCTAL BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SCLS304B – JANUARY 1996 – REVISED DECEMBER 2002
D Typical tpd = 12 ns
D ±6-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D True Logic
SN54HC645 . . . FK PACKAGE
(TOP VIEW)
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
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
description/ordering information
These octal bus transceivers are designed for asynchronous two-way communication between data buses.
These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending upon the
level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the
buses are effectively isolated.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N
Tube
SN74HC645N
SN74HC645N
–40°C to 85°C SOIC – DW
Tube
Tape and reel
SN74HC645DW
SN74HC645DWR
HC645
SOP – NS
Tape and reel SN74HC645NSR
HC645
CDIP – J
Tube
SNJ54HC645J
SNJ54HC645J
–55°C to 125°C CFP – W
Tube
SNJ54HC645W
SNJ54HC645W
LCCC – FK
Tube
SNJ54HC645FK
SNJ54HC645FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
HX
Isolation
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 2002, Texas Instruments Incorporated
On products compliant to MILĆPRFĆ38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1




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SN54HC645 Datasheet Preview

SN54HC645 Datasheet

OCTAL BUS TRANSCEIVERS

No Preview Available !

SN54HC645, SN74HC645
OCTAL BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SCLS304B JANUARY 1996 REVISED DECEMBER 2002
logic diagram (positive logic)
OE 19
1
DIR
2
A1
18
B1
To Seven Other Transceivers
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
Package thermal impedance, θJA (see Note 2): DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under absolute maximum ratingsmay 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 conditionsis not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
VCC Supply voltage
VIH High-level input voltage
VIL Low-level input voltage
VI Input voltage
VO Output voltage
t/v Input transition rise/fall time
TA Operating free-air temperature
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
SN54HC645
MIN NOM MAX
256
1.5
3.15
4.2
0.5
1.35
1.8
0 VCC
0 VCC
1000
500
400
55 125
SN74HC645
MIN NOM MAX
256
1.5
3.15
4.2
0.5
1.35
1.8
0 VCC
0 VCC
1000
500
400
40 85
UNIT
V
V
V
V
V
ns
°C
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN54HC645
Description OCTAL BUS TRANSCEIVERS
Maker etcTI
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SN54HC645 Datasheet PDF






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