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Texas Instruments (TI) Electronic Components Datasheet

SN74F2245 Datasheet

24-Ohm Octal Bus Transceiver

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SN74F2245
25ĆΩ OCTAL BUS TRANSCEIVER
WITH 3ĆSTATE OUTPUTS
SDFS099 MAY 1995
D 3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
D Package Options Include Plastic
Small-Outline (DB) Packages and Plastic
300-mil DIPs (N)
description
The SN74F2245 is designed for asynchronous
communication between data buses. The devices
transmit data 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 disables the device so
the buses are effectively isolated.
DB OR N 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
Both A and B outputs can sink up to 12 mA; 25-Ω resistors are included in the lower output circuit to reduce
overshoot and undershoot.
The SN74F2245 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OE DIR
OPERATION
LL
B data to A bus
LH
A data to B bus
HX
Isolation
logic symbol
logic diagram (positive logic)
19
OE
1
DIR
G3
3EN1[BA]
3EN2[AB]
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
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.
DIR 1
A1 2
19 OE
18 B1
To Seven Other Channels
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.
Copyright © 1995, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 772511443
1


Texas Instruments (TI) Electronic Components Datasheet

SN74F2245 Datasheet

24-Ohm Octal Bus Transceiver

No Preview Available !

SN74F2245
25ĆΩ OCTAL BUS TRANSCEIVER
WITH 3ĆSTATE OUTPUTS
SDFS099 MAY 1995
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 (except I/O ports) (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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
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
MIN NOM MAX UNIT
4.5 5 5.5 V
2V
0.8 V
18 mA
3 mA
12 mA
0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP‡ MAX UNIT
VIK
VOH Any output
VOL
II
IIH§
IIL§
IOS¶
Any output
A and B
DIR and OE
A and B
DIR and OE
A and B
DIR and OE
A and B
VCC = 4.5 V,
VCC = 4.5 V
VCC = 4.75 V,
VCC = 4.5 V
VCC = 5.5 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
II = 18 mA
IOH = 1 mA
IOH = 3 mA
IOH = 1 mA to 3 mA
IOL = 1 mA
IOL = 12 mA
VI = 5.5 V
VI = 7 V
VI = 2.7 V
VI = 0.5 V
VO = 0
Outputs high
1.2 V
2.5 3.4
2.4 3.3
V
2.7
0.2 0.5
0.5 0.75
V
1
0.1 mA
70
20 μA
0.5
0.5
mA
50 120 mA
62 90
ICC
VCC = 5.5 V
Outputs low
73
Outputs disabled
72
§
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.
Not more than one output should be shorted at a time, and the duration of the
short
circuit
should
not
exceed
one
second.
105
100
mA
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 772511443


Part Number SN74F2245
Description 24-Ohm Octal Bus Transceiver
Maker Texas
Total Page 11 Pages
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