Használati útmutató Texas Instruments SN74ALS645A-1N

Texas Instruments nincs kategorizálva SN74ALS645A-1N

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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
•Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
•True Logic
•3-State Outputs
•Package Options Include Plastic
Small-Outline (DW) 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. These devices transmit data from the
A bus to the B bus or from the B bus to the A bus,
depending on the level at the direction-control
(DIR) input. The output-enable (OE) input can be
used to disable the device so that the buses are
eectively isolated.
The -1 version of the SN74ALS645A is identical
to the standard version, except that the
recommended maximum IOL is increased to
48 mA. There is no -1 version of the
SN54ALS645A.
The SN54ALS645A and SN54AS645 are
characterized for operation over the full military
temperature range of –55 C to 125° °C. The
SN74ALS645A and SN74AS645 are
characterized for operation from 0°C to 70 C.°
FUNCTION TABLE
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
SN54ALS645A, SN54AS645 . . . J PACKAGE
SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
SN54ALS645A, SN54AS645 . . . FK PACKAGE
(TOP VIEW)
A2
A1
DIR
B7
B6 OE
A8
GND
B8
V
CC
PRODUCTION DATA information is current as of publication date.
Products conform to specications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol†logic diagram (positive logic)
B2
17
B3
16
B4
15
A5 6
A6 7
A7 8
A8 9
A2 3
A3 4
A4 5
OE
A1 2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
A1 B1
19
1
182
OE
DIR
To Seven Other Transceivers
†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, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN54ALS645A –55°C to 125 C°. . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS645A 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.
recommended operating conditions
SN54ALS645A SN74ALS645A
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.7 0.8 V
IOH High-level output current – 12 – 15 mA
IOL
Low level out
p
ut current
12 24
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
48§
mA
TAOperating free-air temperature – 55 125 0 70 C°
§Applies only to the -1 version and only if V
CC is between 4.75 V and 5.25 V
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS645A SN74ALS645A
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = – 18 mA – 1.5 – 1.5 V
VCC = 4.5 V to 5.5 V, IOH = – 0.4 mA VCC –2 VCC – 2
IOH = – 3 mA 2.4 3.2 2.4 3.2
V
OH VCC = 4.5 V IOH = – 12 mA 2
V
IOH = – 15 mA 2
IOL = 12 mA 0.25 0.4 0.25 0.4
VOL VCC = 4.5 V IOL = 24 mA 0.35 0.5 V
IOL = 48 mA‡0.35 0.5
Control inputs
VCC 5 5 V
VI = 7 V 0.1 0.1
mA
IA or B ports
V
CC =
5
.
5
V
VI = 5.5 V 0.1 0.1
mA
Control inputs
VCC 5 5 V
VI2 7 V
20 20
A
IH A or B ports§
V
CC =
5
.
5
V
,
V
I =
2
.
7
V
20 20
µ
A
Control inputs
VCC 5 5 V
VI0 4 V
– 0.1 – 0.1
mA
IL A or B ports§
V
CC =
5
.
5
V
,
V
I =
0
.
4
V
– 0.1 – 0.1
mA
IOVCC = 5.5 V, V
O = 2.25 V – 20 – 112 –30 –112 mA
Outputs high 30 48 30 45
ICC VCC = 5.5 V Outputs low 36 60 36 55 mA
Outputs disabled 38 63 38 58
†All typical values are at V
CC = 5 V, T
A = 25 C.°
‡Applies only to the -1 version and only if V
CC is between 4.75 V and 5.25 V
§For I/O ports, the parameters I
IH and IIL include the o-state output current.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω
,
R2 = 500 Ω,
T
A = MIN to MAX#UNIT
SN54ALS645A SN74ALS645A
MIN MAX MIN MAX
tPLH
A or B
B or A
1 19 3 10
ns
tPHL
A
or
B
B
or
A
1 14 3 10
ns
tPZH
OE
A or B
2 30 5 20
ns
tPZL
OE
A
or
B
2 29 5 20
ns
tPHZ
OE
A or B
2 14 2 10
ns
tPLZ
OE
A
or
B
2 30 4 15
ns
#For conditions shown as MIN or MAX, use the appropriate value specied under recommended operating conditions.

Termékspecifikációk

Márka: Texas Instruments
Kategória: nincs kategorizálva
Modell: SN74ALS645A-1N

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