Texas Instruments 85506012A Datasheet
OPERATION
SN54HCT245, SN74HCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS020C – MARCH 1984 – REVISED MA Y 1997
D
Inputs Are TTL-Voltage Compatible
D
High-Current 3-State Outputs Drive Bus
Lines Directly or up to 15 LSTTL Loads
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. The control-function implementation
minimizes external timing requirements.
The 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 level at the
direction-control (DIR) input. The output-enable
(OE
) input can be used to disable the device so
that the buses are effectively isolated.
The SN54HCT245 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HCT245 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
SN54HCT245 ...J OR W PACKAGE
SN74HCT245 . . . DB, DW, N, OR PW PACKAGE
SN54HCT245 . . . FK PACKAGE
A3
A4
A5
A6
A7
(TOP VIEW)
1
DIR
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
GND
10
(TOP VIEW)
A2A1DIR
3 2 1 20 19
4
5
6
7
8
910111213
A8
B8
20
19
18
17
16
15
14
13
12
11
V
B7
CC
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
OE
18
17
16
15
14
B6
CC
B1
B2
B3
B4
B5
GND
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 1997, Texas Instruments Incorporated
1
SN54HCT245, SN74HCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS020C – MARCH 1984 – REVISED MA Y 1997
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
OE
DIR
A1
A2
A3
A4
A5
A6
A7
A8
19
1
2
3
4
5
6
7
8
9
G3
3 EN1 [BA]
3 EN2 [AB]
1
2
logic diagram (positive logic)
1
DIR
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
A1
19
OE
2
18
B1
To Seven Other Channels
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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