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905-23

Part # 905-23
Description LOCK WASHER, STEEL OVERALLSPLIT HELICAL-RIGHT HAND
Category HARDWARE
Availability In Stock
Qty 620
Qty Price
1 - 130 $1.18760
131 - 260 $0.94469
261 - 390 $0.89070
391 - 520 $0.82772
521 + $0.73775
Manufacturer Available Qty
Littelfuse
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

SN54ALS646, SN54ALS648, SN54AS646
SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
SN54ALS646 SN74ALS646A
UNIT
PARAMETER
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.2 –1.2 V
V
CC
= 4.5 V to 5.5 V, I
OH
= –0.4 mA V
CC
–2 V
CC
–2
V
OH
I
OH
= –3 mA 2.4 3.2 2.4 3.2
V
V
OH
V
CC
= 4.5 V
I
OH
= –12 mA 2
V
I
OH
= –15 mA 2
I
OL
= 12 mA 0.25 0.4 0.25 0.4
V
OL
V
CC
= 4.5 V
I
OL
= 24 mA 0.35 0.5
V
I
OL
= 48 mA
‡
0.35 0.5
I
I
Control inputs
V
CC
=55V
V
I
= 7 V 0.1 0.1
mA
I
I
A or B ports
V
CC
=
5
.
5
V
V
I
= 5.5 V 0.1 0.1
mA
I
Control inputs
V55V
V27V
20 20
A
I
IH
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
2
.
7
V
20 20
µ
A
I
Control inputs
V55V
V04V
–0.2 –0.2
mA
I
IL
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.2 –0.2
m
A
I
O
V
CC
= 5.5 V, V
O
= 2.25 V –20 –112 –30 –112 mA
Outputs high 47 76 47 76
I
CC
V
CC
= 5.5 V
Outputs low 55 88 55 88
mA
Outputs disabled 55 88 55 88
†
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 maintained between 4.75 V and 5.25
§
For I/O ports, the parameters I
IH
and I
IL
include the off-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
.
SN54ALS646, SN54ALS648, SN54AS646
SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
T
A
= MIN to MAX
†
UNIT
SN54ALS646 SN74ALS646A
MIN MAX MIN MAX
f
max
35 40 MHz
t
PLH
CLKBA or CLKAB
AorB
10 35 7 30
ns
t
PHL
CLKBA
or
CLKAB
A
or
B
5 20 5 17
ns
t
PLH
AorB
BorA
5 22 3 20
ns
t
PHL
A
or
B
B
or
A
3 15 3 12
ns
t
PLH
SBA or SAB
‡
AorB
10 40 7 35
ns
t
PHL
(stored data low)
A
or
B
5 23 5 20
ns
t
PLH
SBA or SAB
‡
AorB
8 30 6 25
ns
t
PHL
(stored data high)
A
or
B
5 24 5 20
ns
t
PZH
OE
AorB
3 20 2 17
ns
t
PZL
OE
A
or
B
5 22 4 20
ns
t
PHZ
OE
AorB
1 12 1 10
ns
t
PLZ
OE
A
or
B
1 20 2 16
ns
t
PZH
DIR
AorB
5 38 3 30
ns
t
PZL
DIR
A
or
B
5 30 4 25
ns
t
PHZ
DIR
AorB
1 12 1 10
ns
t
PLZ
DIR
A
or
B
2 21 2 16
ns
†
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
These parameters are measured with the internal output state of the storage register opposite that of the bus input.
SN54ALS646, SN54ALS648, SN54AS646
SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
: Control inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS648 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS648A 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
SN54ALS648 SN74ALS648A
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
I
OH
High-level output current –12 –15 mA
I
OL
Low-level output current 12 24 mA
f
clock
Clock frequency 0 35 0 40 MHz
t
w
Pulse duration, CLKBA or CLKAB high or low 14.5 12.5 ns
t
su
Setup time, A before CLKAB↑ or B before CLKBA↑ 15 10 ns
t
h
Hold time, A after CLKAB↑ or B after CLKBA↑ 0 0 ns
T
A
Operating free-air temperature –55 125 0 70 °C
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